From b40a7d340f3f0cc6b2f46713a3538a527b6879f9 Mon Sep 17 00:00:00 2001
From: Anthony GAEREMYNCK <1@anthony.sh>
Date: Fri, 31 Jul 2026 09:17:08 +0200
Subject: [PATCH] Add support for csv + xlsx

---
 .idea/php.xml                       |   1 +
 package-lock.json                   | 741 ++++++++++++++++++++++++++++
 package.json                        |   1 +
 src/converters/document.js          | 254 +++++++++-
 src/mime.js                         |   3 +
 test/converters/spreadsheet.test.js | 212 ++++++++
 6 files changed, 1211 insertions(+), 1 deletion(-)
 create mode 100644 test/converters/spreadsheet.test.js

diff --git a/.idea/php.xml b/.idea/php.xml
index f324872..faac9f9 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -10,6 +10,7 @@
     <option name="highlightLevel" value="WARNING" />
     <option name="transferred" value="true" />
   </component>
+  <component name="PhpProjectSharedConfiguration" php_language_level="8.4" />
   <component name="PhpStanOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>
diff --git a/package-lock.json b/package-lock.json
index eb31bf2..ee8a8f4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
         "@prisma/client": "^6.19.3",
         "docx": "^9.7.1",
         "dotenv": "^17.4.2",
+        "exceljs": "^4.4.0",
         "express": "^5.2.1",
         "express-rate-limit": "^8.6.1",
         "file-type": "^22.0.1",
@@ -104,6 +105,47 @@
       "license": "0BSD",
       "optional": true
     },
+    "node_modules/@fast-csv/format": {
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/@fast-csv/format/-/format-4.3.5.tgz",
+      "integrity": "sha512-8iRn6QF3I8Ak78lNAa+Gdl5MJJBM5vRHivFtMRUWINdevNo00K7OXxS2PshawLKTejVwieIlPmK5YlLu6w4u8A==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "^14.0.1",
+        "lodash.escaperegexp": "^4.1.2",
+        "lodash.isboolean": "^3.0.3",
+        "lodash.isequal": "^4.5.0",
+        "lodash.isfunction": "^3.0.9",
+        "lodash.isnil": "^4.0.0"
+      }
+    },
+    "node_modules/@fast-csv/format/node_modules/@types/node": {
+      "version": "14.18.63",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.18.63.tgz",
+      "integrity": "sha512-fAtCfv4jJg+ExtXhvCkCqUKZ+4ok/JQk01qDKhL5BDDoS3AxKXhV5/MAVUZyQnSEd2GT92fkgZl0pz0Q0AzcIQ==",
+      "license": "MIT"
+    },
+    "node_modules/@fast-csv/parse": {
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/@fast-csv/parse/-/parse-4.3.6.tgz",
+      "integrity": "sha512-uRsLYksqpbDmWaSmzvJcuApSEe38+6NQZBUsuAyMZKqHxH0g1wcJgsKUvN3WC8tewaqFjBMMGrkHmC+T7k8LvA==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "^14.0.1",
+        "lodash.escaperegexp": "^4.1.2",
+        "lodash.groupby": "^4.6.0",
+        "lodash.isfunction": "^3.0.9",
+        "lodash.isnil": "^4.0.0",
+        "lodash.isundefined": "^3.0.1",
+        "lodash.uniq": "^4.5.0"
+      }
+    },
+    "node_modules/@fast-csv/parse/node_modules/@types/node": {
+      "version": "14.18.63",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.18.63.tgz",
+      "integrity": "sha512-fAtCfv4jJg+ExtXhvCkCqUKZ+4ok/JQk01qDKhL5BDDoS3AxKXhV5/MAVUZyQnSEd2GT92fkgZl0pz0Q0AzcIQ==",
+      "license": "MIT"
+    },
     "node_modules/@img/colour": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
@@ -1804,6 +1846,59 @@
       "integrity": "sha512-klpgFSWLW1ZEs8svjfb7g4qWY0YS5imI82dTg+QahUvJ8YqAY0P10Uk8tTyh9ZGuYEZEMaeJYCF5BFuX552hsw==",
       "license": "MIT"
     },
+    "node_modules/archiver": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/archiver/-/archiver-5.3.2.tgz",
+      "integrity": "sha512-+25nxyyznAXF7Nef3y0EbBeqmGZgeN/BxHX29Rs39djAfaFalmQ89SE6CWyDCHzGL0yt/ycBtNOmGTW0FyGWNw==",
+      "license": "MIT",
+      "dependencies": {
+        "archiver-utils": "^2.1.0",
+        "async": "^3.2.4",
+        "buffer-crc32": "^0.2.1",
+        "readable-stream": "^3.6.0",
+        "readdir-glob": "^1.1.2",
+        "tar-stream": "^2.2.0",
+        "zip-stream": "^4.1.0"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/archiver-utils": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/archiver-utils/-/archiver-utils-2.1.0.tgz",
+      "integrity": "sha512-bEL/yUb/fNNiNTuUz979Z0Yg5L+LzLxGJz8x79lYmR54fmTIb6ob/hNQgkQnIUDWIFjZVQwl9Xs356I6BAMHfw==",
+      "license": "MIT",
+      "dependencies": {
+        "glob": "^7.1.4",
+        "graceful-fs": "^4.2.0",
+        "lazystream": "^1.0.0",
+        "lodash.defaults": "^4.2.0",
+        "lodash.difference": "^4.5.0",
+        "lodash.flatten": "^4.4.0",
+        "lodash.isplainobject": "^4.0.6",
+        "lodash.union": "^4.6.0",
+        "normalize-path": "^3.0.0",
+        "readable-stream": "^2.0.0"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/archiver/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -1861,6 +1956,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/balanced-match": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
+      "license": "MIT"
+    },
     "node_modules/base64-js": {
       "version": "1.5.1",
       "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
@@ -1890,6 +1991,28 @@
         "node": ">=10.0.0"
       }
     },
+    "node_modules/big-integer": {
+      "version": "1.6.52",
+      "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.52.tgz",
+      "integrity": "sha512-QxD8cf2eVqJOOz63z6JIN9BzvVs/dlySa5HGSBH5xtR8dPteIRQnBxxKqkNTiT6jbDTF6jAfrd4oMcND9RGbQg==",
+      "license": "Unlicense",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/binary": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/binary/-/binary-0.3.0.tgz",
+      "integrity": "sha512-D4H1y5KYwpJgK8wk1Cue5LLPgmwHKYSChkbspQg5JtVuR5ulGckxfR62H3AE9UDkdMC8yyXlqYihuz3Aqg2XZg==",
+      "license": "MIT",
+      "dependencies": {
+        "buffers": "~0.1.1",
+        "chainsaw": "~0.1.0"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/binary-extensions": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.3.0.tgz",
@@ -1902,6 +2025,31 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/bl": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
+      "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
+    },
+    "node_modules/bl/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/bluebird": {
       "version": "3.4.7",
       "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.4.7.tgz",
@@ -1945,6 +2093,16 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/brace-expansion": {
+      "version": "1.1.18",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.18.tgz",
+      "integrity": "sha512-Edep/X9fGqVNmzKBVsDYIOtD+z1tuezV70LBjdCst9Tqu76lsnvRiZ6oTic1n+/BIwX6QDGAO94PN4N2SADvtw==",
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
     "node_modules/braces": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
@@ -1957,12 +2115,62 @@
         "node": ">=8"
       }
     },
+    "node_modules/buffer": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
+    "node_modules/buffer-crc32": {
+      "version": "0.2.13",
+      "resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
+      "integrity": "sha512-VO9Ht/+p3SN7SKWqcrgEzjGbRSJYTx+Q1pTQC0wrWqHx0vpJraQ6GtHx8tvcg1rlK1byhU5gccxgOgj7B0TDkQ==",
+      "license": "MIT",
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/buffer-from": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.2.tgz",
       "integrity": "sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ==",
       "license": "MIT"
     },
+    "node_modules/buffer-indexof-polyfill": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/buffer-indexof-polyfill/-/buffer-indexof-polyfill-1.0.2.tgz",
+      "integrity": "sha512-I7wzHwA3t1/lwXQh+A5PbNvJxgfo5r3xulgpYDB5zckTu/Z9oUK9biouBKQUjEqzaz3HnAT6TYoovmE+GqSf7A==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
+    "node_modules/buffers": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/buffers/-/buffers-0.1.1.tgz",
+      "integrity": "sha512-9q/rDEGSb/Qsvv2qvzIzdluL5k7AaJOTrw23z9reQthrbF7is4CtlT0DXyO1oei2DCp4uojjzQ7igaSHp1kAEQ==",
+      "engines": {
+        "node": ">=0.2.0"
+      }
+    },
     "node_modules/busboy": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/busboy/-/busboy-1.6.0.tgz",
@@ -2094,6 +2302,18 @@
         "node": ">=18"
       }
     },
+    "node_modules/chainsaw": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/chainsaw/-/chainsaw-0.1.0.tgz",
+      "integrity": "sha512-75kWfWt6MEKNC8xYXIdRpDehRYY/tNSgwKaJq+dbbDcxORuVrrQ+SEHoWsniVn9XPYfP4gmdWIeDk/4YNp1rNQ==",
+      "license": "MIT/X11",
+      "dependencies": {
+        "traverse": ">=0.3.0 <0.4"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/chalk": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-3.0.0.tgz",
@@ -2261,6 +2481,41 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/compress-commons": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/compress-commons/-/compress-commons-4.1.2.tgz",
+      "integrity": "sha512-D3uMHtGc/fcO1Gt1/L7i1e33VOvD4A9hfQLP+6ewd+BvG/gQ84Yh4oftEhAdjSMgBgwGL+jsppT7JYNpo6MHHg==",
+      "license": "MIT",
+      "dependencies": {
+        "buffer-crc32": "^0.2.13",
+        "crc32-stream": "^4.0.2",
+        "normalize-path": "^3.0.0",
+        "readable-stream": "^3.6.0"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/compress-commons/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/concat-map": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
+      "license": "MIT"
+    },
     "node_modules/concat-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-2.0.0.tgz",
@@ -2367,6 +2622,45 @@
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       "license": "MIT"
     },
+    "node_modules/crc-32": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/crc-32/-/crc-32-1.2.2.tgz",
+      "integrity": "sha512-ROmzCKrTnOwybPcJApAA6WBWij23HVfGVNKqqrZpuyZOHqK2CwHSvpGuyt/UNNvaIjEd8X5IFGp4Mh+Ie1IHJQ==",
+      "license": "Apache-2.0",
+      "bin": {
+        "crc32": "bin/crc32.njs"
+      },
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/crc32-stream": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/crc32-stream/-/crc32-stream-4.0.3.tgz",
+      "integrity": "sha512-NT7w2JVU7DFroFdYkeq8cywxrgjPHWkdX1wjpRQXPX5Asews3tA+Ght6lddQO5Mkumffp3X7GEqku3epj2toIw==",
+      "license": "MIT",
+      "dependencies": {
+        "crc-32": "^1.2.0",
+        "readable-stream": "^3.4.0"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/crc32-stream/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/croner": {
       "version": "4.1.97",
       "resolved": "https://registry.npmjs.org/croner/-/croner-4.1.97.tgz",
@@ -2523,6 +2817,15 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/duplexer2": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.1.4.tgz",
+      "integrity": "sha512-asLFVfWWtJ90ZyOUHMqk7/S2w2guQKxUI2itj3d92ADHhxUSbCMGi1f1cBcJ7xM1To+pE/Khbwo1yuNbMEPKeA==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "readable-stream": "^2.0.2"
+      }
+    },
     "node_modules/ee-first": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
@@ -2565,6 +2868,15 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/end-of-stream": {
+      "version": "1.4.5",
+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.5.tgz",
+      "integrity": "sha512-ooEGc6HP26xXq/N+GCGOT0JKCLDGrq2bQUZrQ7gyrJiZANJ/8YDTxTpQBXGMn+WbIQXNVpyWymm7KYVICQnyOg==",
+      "license": "MIT",
+      "dependencies": {
+        "once": "^1.4.0"
+      }
+    },
     "node_modules/entities": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/entities/-/entities-8.0.0.tgz",
@@ -2722,6 +3034,50 @@
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       "license": "MIT"
     },
+    "node_modules/exceljs": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/exceljs/-/exceljs-4.4.0.tgz",
+      "integrity": "sha512-XctvKaEMaj1Ii9oDOqbW/6e1gXknSY4g/aLCDicOXqBE4M0nRWkUu0PTp++UPNzoFY12BNHMfs/VadKIS6llvg==",
+      "license": "MIT",
+      "dependencies": {
+        "archiver": "^5.0.0",
+        "dayjs": "^1.8.34",
+        "fast-csv": "^4.3.1",
+        "jszip": "^3.10.1",
+        "readable-stream": "^3.6.0",
+        "saxes": "^5.0.1",
+        "tmp": "^0.2.0",
+        "unzipper": "^0.10.11",
+        "uuid": "^8.3.0"
+      },
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@@ -3011,6 +3380,18 @@
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+    },
+    "node_modules/tar-stream/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -5278,6 +5928,15 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/tmp": {
+      "version": "0.2.7",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.2.7.tgz",
+      "integrity": "sha512-e0votIpp4Uo2AJYSzVHV6xCcawuiez3DzqDAbrTc3YxBkplN6e+dM13ZeIcZnDg/QpSuU2zfZ3rzwY8ukEnaXw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.14"
+      }
+    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -5317,6 +5976,15 @@
         "url": "https://github.com/sponsors/Borewit"
       }
     },
+    "node_modules/traverse": {
+      "version": "0.3.9",
+      "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.3.9.tgz",
+      "integrity": "sha512-iawgk0hLP3SxGKDfnDJf8wTz4p2qImnyihM5Hh/sGvQ3K37dPi/w8sRhdNIxYA1TwFwc5mDhIJq+O0RsvXBKdQ==",
+      "license": "MIT/X11",
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/tslib": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
@@ -5445,6 +6113,24 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/unzipper": {
+      "version": "0.10.14",
+      "resolved": "https://registry.npmjs.org/unzipper/-/unzipper-0.10.14.tgz",
+      "integrity": "sha512-ti4wZj+0bQTiX2KmKWuwj7lhV+2n//uXEotUmGuQqrbVZSEGFMbI68+c6JCQ8aAmUWYvtHEz2A8K6wXvueR/6g==",
+      "license": "MIT",
+      "dependencies": {
+        "big-integer": "^1.6.17",
+        "binary": "~0.3.0",
+        "bluebird": "~3.4.1",
+        "buffer-indexof-polyfill": "~1.0.0",
+        "duplexer2": "~0.1.4",
+        "fstream": "^1.0.12",
+        "graceful-fs": "^4.2.2",
+        "listenercount": "~1.0.1",
+        "readable-stream": "~2.3.6",
+        "setimmediate": "~1.0.4"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -5752,6 +6438,12 @@
         "node": ">=4.0"
       }
     },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "license": "MIT"
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
@@ -5787,6 +6479,55 @@
         "node": "^20.19.0 || ^22.12.0 || >=23"
       }
     },
+    "node_modules/zip-stream": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-4.1.1.tgz",
+      "integrity": "sha512-9qv4rlDiopXg4E69k+vMHjNN63YFMe9sZMrdlvKnCjlCRWeCBswPPMPUfx+ipsAWq1LXHe70RcbaHdJJpS6hyQ==",
+      "license": "MIT",
+      "dependencies": {
+        "archiver-utils": "^3.0.4",
+        "compress-commons": "^4.1.2",
+        "readable-stream": "^3.6.0"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/zip-stream/node_modules/archiver-utils": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/archiver-utils/-/archiver-utils-3.0.4.tgz",
+      "integrity": "sha512-KVgf4XQVrTjhyWmx6cte4RxonPLR9onExufI1jhvw/MQ4BB6IsZD5gT8Lq+u/+pRkWna/6JoHpiQioaqFP5Rzw==",
+      "license": "MIT",
+      "dependencies": {
+        "glob": "^7.2.3",
+        "graceful-fs": "^4.2.0",
+        "lazystream": "^1.0.0",
+        "lodash.defaults": "^4.2.0",
+        "lodash.difference": "^4.5.0",
+        "lodash.flatten": "^4.4.0",
+        "lodash.isplainobject": "^4.0.6",
+        "lodash.union": "^4.6.0",
+        "normalize-path": "^3.0.0",
+        "readable-stream": "^3.6.0"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/zip-stream/node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
     "node_modules/zod": {
       "version": "3.25.76",
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
diff --git a/package.json b/package.json
index 433ea5a..cc13393 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
     "@prisma/client": "^6.19.3",
     "docx": "^9.7.1",
     "dotenv": "^17.4.2",
+    "exceljs": "^4.4.0",
     "express": "^5.2.1",
     "express-rate-limit": "^8.6.1",
     "file-type": "^22.0.1",
diff --git a/src/converters/document.js b/src/converters/document.js
index f34ae46..5527aab 100644
--- a/src/converters/document.js
+++ b/src/converters/document.js
@@ -2,9 +2,10 @@ import fs from 'node:fs/promises';
 import mammoth from 'mammoth';
 import puppeteer from 'puppeteer';
 import * as pdfjsLib from 'pdfjs-dist/legacy/build/pdf.mjs';
-import { Document, Paragraph, TextRun, HeadingLevel, Packer } from 'docx';
+import { Document, Paragraph, TextRun, HeadingLevel, Table, TableRow, TableCell, Packer } from 'docx';
 import MarkdownIt from 'markdown-it';
 import TurndownService from 'turndown';
+import ExcelJS from 'exceljs';
 import { register } from './registry.js';
 
 async function renderHtmlToPdf(html, outputPath) {
@@ -217,6 +218,234 @@ async function convertPdfToDocx(inputPath, outputPath) {
   await fs.writeFile(outputPath, buffer);
 }
 
+function decodeHtmlEntities(text) {
+  return text
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&quot;/g, '"')
+    .replace(/&#39;/g, "'")
+    .replace(/&nbsp;/g, ' ')
+    .replace(/&amp;/g, '&');
+}
+
+function stripTags(html) {
+  return decodeHtmlEntities(html.replace(/<[^>]*>/g, '')).trim();
+}
+
+function parseHtmlTableToRows(html) {
+  const tableMatch = html.match(/<table[^>]*>([\s\S]*?)<\/table>/i);
+  if (!tableMatch) return [];
+  const rowMatches = [...tableMatch[1].matchAll(/<tr[^>]*>([\s\S]*?)<\/tr>/gi)];
+  return rowMatches.map((rowMatch) => {
+    const cellMatches = [...rowMatch[1].matchAll(/<t[hd][^>]*>([\s\S]*?)<\/t[hd]>/gi)];
+    return cellMatches.map((cellMatch) => stripTags(cellMatch[1]));
+  });
+}
+
+function rowsToHtmlDocument(rows) {
+  const body = rows
+    .map((row) => `<tr>${row.map((cell) => `<td>${escapeHtml(String(cell ?? ''))}</td>`).join('')}</tr>`)
+    .join('\n');
+  return `<html><body><table>${body}</table></body></html>`;
+}
+
+function escapeMarkdownCell(cell) {
+  return String(cell ?? '').replace(/\|/g, '\\|').replace(/\r?\n/g, ' ');
+}
+
+function rowsToMarkdownTable(rows) {
+  if (rows.length === 0) return '';
+  const [header, ...body] = rows;
+  const headerLine = `| ${header.map(escapeMarkdownCell).join(' | ')} |`;
+  const separatorLine = `| ${header.map(() => '---').join(' | ')} |`;
+  const bodyLines = body.map((row) => `| ${row.map(escapeMarkdownCell).join(' | ')} |`);
+  return [headerLine, separatorLine, ...bodyLines].join('\n') + '\n';
+}
+
+function inlineTokensToPlainText(children) {
+  let text = '';
+  for (const token of children ?? []) {
+    if (token.type === 'text' || token.type === 'code_inline') text += token.content;
+    else if (token.type === 'softbreak' || token.type === 'hardbreak') text += ' ';
+  }
+  return text.trim();
+}
+
+function parseMarkdownTableToRows(markdown) {
+  const tokens = new MarkdownIt().parse(markdown, {});
+  const rows = [];
+  let currentRow = null;
+  for (let i = 0; i < tokens.length; i += 1) {
+    const token = tokens[i];
+    if (token.type === 'tr_open') {
+      currentRow = [];
+    } else if (token.type === 'tr_close') {
+      if (currentRow) rows.push(currentRow);
+      currentRow = null;
+    } else if ((token.type === 'th_open' || token.type === 'td_open') && currentRow) {
+      currentRow.push(inlineTokensToPlainText(tokens[i + 1]?.children));
+    }
+  }
+  return rows;
+}
+
+function parseTxtToRows(text) {
+  const lines = text.split(/\r?\n/);
+  while (lines.length > 0 && lines[lines.length - 1] === '') lines.pop();
+  return lines.map((line) => line.split('\t'));
+}
+
+function rowsToTxt(rows) {
+  return `${rows.map((row) => row.map((cell) => String(cell ?? '')).join('\t')).join('\n')}\n`;
+}
+
+async function parseDocxToRows(inputPath) {
+  const result = await mammoth.convertToHtml({ path: inputPath });
+  return parseHtmlTableToRows(result.value);
+}
+
+async function writeRowsAsDocx(rows, outputPath) {
+  const table = new Table({
+    rows: rows.map(
+      (row) =>
+        new TableRow({
+          children: row.map(
+            (cell) => new TableCell({ children: [new Paragraph({ children: [new TextRun({ text: String(cell ?? '') })] })] })
+          ),
+        })
+    ),
+  });
+  const doc = new Document({ sections: [{ children: [table] }] });
+  const buffer = await Packer.toBuffer(doc);
+  await fs.writeFile(outputPath, buffer);
+}
+
+async function parsePdfToRows(inputPath) {
+  const pageTexts = await extractPdfPageTexts(inputPath);
+  return pageTexts.map((text) => [text]);
+}
+
+async function readSpreadsheetRows(inputPath, format) {
+  const workbook = new ExcelJS.Workbook();
+  let worksheet;
+  if (format === 'csv') {
+    worksheet = await workbook.csv.readFile(inputPath);
+  } else {
+    await workbook.xlsx.readFile(inputPath);
+    [worksheet] = workbook.worksheets;
+  }
+  const rows = [];
+  worksheet.eachRow({ includeEmpty: true }, (row) => {
+    rows.push(row.values.slice(1).map((value) => value ?? ''));
+  });
+  return rows;
+}
+
+async function writeSpreadsheetRows(rows, outputPath, format) {
+  const workbook = new ExcelJS.Workbook();
+  const worksheet = workbook.addWorksheet('Sheet1');
+  worksheet.addRows(rows);
+  if (format === 'csv') {
+    await workbook.csv.writeFile(outputPath);
+  } else {
+    await workbook.xlsx.writeFile(outputPath);
+  }
+}
+
+async function convertCsvToXlsx(inputPath, outputPath) {
+  await writeSpreadsheetRows(await readSpreadsheetRows(inputPath, 'csv'), outputPath, 'xlsx');
+}
+
+async function convertXlsxToCsv(inputPath, outputPath) {
+  await writeSpreadsheetRows(await readSpreadsheetRows(inputPath, 'xlsx'), outputPath, 'csv');
+}
+
+async function convertCsvToHtml(inputPath, outputPath) {
+  await fs.writeFile(outputPath, rowsToHtmlDocument(await readSpreadsheetRows(inputPath, 'csv')));
+}
+
+async function convertXlsxToHtml(inputPath, outputPath) {
+  await fs.writeFile(outputPath, rowsToHtmlDocument(await readSpreadsheetRows(inputPath, 'xlsx')));
+}
+
+async function convertHtmlToCsv(inputPath, outputPath) {
+  const html = await fs.readFile(inputPath, 'utf8');
+  await writeSpreadsheetRows(parseHtmlTableToRows(html), outputPath, 'csv');
+}
+
+async function convertHtmlToXlsx(inputPath, outputPath) {
+  const html = await fs.readFile(inputPath, 'utf8');
+  await writeSpreadsheetRows(parseHtmlTableToRows(html), outputPath, 'xlsx');
+}
+
+async function convertCsvToMd(inputPath, outputPath) {
+  await fs.writeFile(outputPath, rowsToMarkdownTable(await readSpreadsheetRows(inputPath, 'csv')));
+}
+
+async function convertXlsxToMd(inputPath, outputPath) {
+  await fs.writeFile(outputPath, rowsToMarkdownTable(await readSpreadsheetRows(inputPath, 'xlsx')));
+}
+
+async function convertMdToCsv(inputPath, outputPath) {
+  const markdown = await fs.readFile(inputPath, 'utf8');
+  await writeSpreadsheetRows(parseMarkdownTableToRows(markdown), outputPath, 'csv');
+}
+
+async function convertMdToXlsx(inputPath, outputPath) {
+  const markdown = await fs.readFile(inputPath, 'utf8');
+  await writeSpreadsheetRows(parseMarkdownTableToRows(markdown), outputPath, 'xlsx');
+}
+
+async function convertCsvToTxt(inputPath, outputPath) {
+  await fs.writeFile(outputPath, rowsToTxt(await readSpreadsheetRows(inputPath, 'csv')));
+}
+
+async function convertXlsxToTxt(inputPath, outputPath) {
+  await fs.writeFile(outputPath, rowsToTxt(await readSpreadsheetRows(inputPath, 'xlsx')));
+}
+
+async function convertTxtToCsv(inputPath, outputPath) {
+  const text = await fs.readFile(inputPath, 'utf8');
+  await writeSpreadsheetRows(parseTxtToRows(text), outputPath, 'csv');
+}
+
+async function convertTxtToXlsx(inputPath, outputPath) {
+  const text = await fs.readFile(inputPath, 'utf8');
+  await writeSpreadsheetRows(parseTxtToRows(text), outputPath, 'xlsx');
+}
+
+async function convertCsvToDocx(inputPath, outputPath) {
+  await writeRowsAsDocx(await readSpreadsheetRows(inputPath, 'csv'), outputPath);
+}
+
+async function convertXlsxToDocx(inputPath, outputPath) {
+  await writeRowsAsDocx(await readSpreadsheetRows(inputPath, 'xlsx'), outputPath);
+}
+
+async function convertDocxToCsv(inputPath, outputPath) {
+  await writeSpreadsheetRows(await parseDocxToRows(inputPath), outputPath, 'csv');
+}
+
+async function convertDocxToXlsx(inputPath, outputPath) {
+  await writeSpreadsheetRows(await parseDocxToRows(inputPath), outputPath, 'xlsx');
+}
+
+async function convertCsvToPdf(inputPath, outputPath) {
+  await renderHtmlToPdf(rowsToHtmlDocument(await readSpreadsheetRows(inputPath, 'csv')), outputPath);
+}
+
+async function convertXlsxToPdf(inputPath, outputPath) {
+  await renderHtmlToPdf(rowsToHtmlDocument(await readSpreadsheetRows(inputPath, 'xlsx')), outputPath);
+}
+
+async function convertPdfToCsv(inputPath, outputPath) {
+  await writeSpreadsheetRows(await parsePdfToRows(inputPath), outputPath, 'csv');
+}
+
+async function convertPdfToXlsx(inputPath, outputPath) {
+  await writeSpreadsheetRows(await parsePdfToRows(inputPath), outputPath, 'xlsx');
+}
+
 export function registerDocumentConverters() {
   register({ family: 'document', sourceFormat: 'docx', targetFormat: 'html', convert: convertDocxToHtml });
   register({ family: 'document', sourceFormat: 'txt', targetFormat: 'pdf', convert: convertTxtToPdf });
@@ -233,4 +462,27 @@ export function registerDocumentConverters() {
   register({ family: 'document', sourceFormat: 'pdf', targetFormat: 'txt', convert: convertPdfToTxt });
   register({ family: 'document', sourceFormat: 'pdf', targetFormat: 'html', convert: convertPdfToHtml });
   register({ family: 'document', sourceFormat: 'pdf', targetFormat: 'docx', convert: convertPdfToDocx });
+
+  register({ family: 'document', sourceFormat: 'csv', targetFormat: 'xlsx', convert: convertCsvToXlsx });
+  register({ family: 'document', sourceFormat: 'xlsx', targetFormat: 'csv', convert: convertXlsxToCsv });
+  register({ family: 'document', sourceFormat: 'csv', targetFormat: 'html', convert: convertCsvToHtml });
+  register({ family: 'document', sourceFormat: 'xlsx', targetFormat: 'html', convert: convertXlsxToHtml });
+  register({ family: 'document', sourceFormat: 'html', targetFormat: 'csv', convert: convertHtmlToCsv });
+  register({ family: 'document', sourceFormat: 'html', targetFormat: 'xlsx', convert: convertHtmlToXlsx });
+  register({ family: 'document', sourceFormat: 'csv', targetFormat: 'md', convert: convertCsvToMd });
+  register({ family: 'document', sourceFormat: 'xlsx', targetFormat: 'md', convert: convertXlsxToMd });
+  register({ family: 'document', sourceFormat: 'md', targetFormat: 'csv', convert: convertMdToCsv });
+  register({ family: 'document', sourceFormat: 'md', targetFormat: 'xlsx', convert: convertMdToXlsx });
+  register({ family: 'document', sourceFormat: 'csv', targetFormat: 'txt', convert: convertCsvToTxt });
+  register({ family: 'document', sourceFormat: 'xlsx', targetFormat: 'txt', convert: convertXlsxToTxt });
+  register({ family: 'document', sourceFormat: 'txt', targetFormat: 'csv', convert: convertTxtToCsv });
+  register({ family: 'document', sourceFormat: 'txt', targetFormat: 'xlsx', convert: convertTxtToXlsx });
+  register({ family: 'document', sourceFormat: 'csv', targetFormat: 'docx', convert: convertCsvToDocx });
+  register({ family: 'document', sourceFormat: 'xlsx', targetFormat: 'docx', convert: convertXlsxToDocx });
+  register({ family: 'document', sourceFormat: 'docx', targetFormat: 'csv', convert: convertDocxToCsv });
+  register({ family: 'document', sourceFormat: 'docx', targetFormat: 'xlsx', convert: convertDocxToXlsx });
+  register({ family: 'document', sourceFormat: 'csv', targetFormat: 'pdf', convert: convertCsvToPdf });
+  register({ family: 'document', sourceFormat: 'xlsx', targetFormat: 'pdf', convert: convertXlsxToPdf });
+  register({ family: 'document', sourceFormat: 'pdf', targetFormat: 'csv', convert: convertPdfToCsv });
+  register({ family: 'document', sourceFormat: 'pdf', targetFormat: 'xlsx', convert: convertPdfToXlsx });
 }
diff --git a/src/mime.js b/src/mime.js
index 5493548..3d1d06b 100644
--- a/src/mime.js
+++ b/src/mime.js
@@ -14,6 +14,8 @@ const OUTPUT_MIME_TYPES = {
   txt: 'text/plain',
   docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
   md: 'text/markdown',
+  csv: 'text/csv',
+  xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
 };
 
 export async function detectInputMime(filePath) {
@@ -33,6 +35,7 @@ const UNDETECTABLE_TEXT_FORMATS = {
   txt: 'text/plain',
   html: 'text/html',
   md: 'text/markdown',
+  csv: 'text/csv',
 };
 
 function normalizeFormat(format) {
diff --git a/test/converters/spreadsheet.test.js b/test/converters/spreadsheet.test.js
new file mode 100644
index 0000000..c0bcd8c
--- /dev/null
+++ b/test/converters/spreadsheet.test.js
@@ -0,0 +1,212 @@
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import os from 'node:os';
+import ExcelJS from 'exceljs';
+import { PDFDocument, StandardFonts } from 'pdf-lib';
+import { registerDocumentConverters } from '../../src/converters/document.js';
+import { resolve } from '../../src/converters/registry.js';
+import { detectInputMime } from '../../src/mime.js';
+
+let tmpDir;
+let csvFixturePath;
+let xlsxFixturePath;
+
+beforeAll(async () => {
+  registerDocumentConverters();
+  tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'converter-spreadsheet-'));
+
+  csvFixturePath = path.join(tmpDir, 'fixture.csv');
+  await fs.writeFile(csvFixturePath, 'Name,Age\nAlice,30\nBob,25\n');
+
+  const workbook = new ExcelJS.Workbook();
+  const worksheet = workbook.addWorksheet('Sheet1');
+  worksheet.addRows([
+    ['Name', 'Age'],
+    ['Alice', 30],
+    ['Bob', 25],
+  ]);
+  xlsxFixturePath = path.join(tmpDir, 'fixture.xlsx');
+  await workbook.xlsx.writeFile(xlsxFixturePath);
+});
+
+afterAll(async () => {
+  await fs.rm(tmpDir, { recursive: true, force: true });
+});
+
+describe('spreadsheet converters', () => {
+  it('converts CSV to XLSX', async () => {
+    const outputPath = path.join(tmpDir, 'from-csv.xlsx');
+    const entry = resolve('csv', 'xlsx');
+
+    await entry.convert(csvFixturePath, outputPath);
+
+    const workbook = new ExcelJS.Workbook();
+    await workbook.xlsx.readFile(outputPath);
+    const [worksheet] = workbook.worksheets;
+    expect(worksheet.getRow(2).values.slice(1)).toEqual(['Alice', 30]);
+  });
+
+  it('converts XLSX to CSV', async () => {
+    const outputPath = path.join(tmpDir, 'from-xlsx.csv');
+    const entry = resolve('xlsx', 'csv');
+
+    await entry.convert(xlsxFixturePath, outputPath);
+
+    const csv = await fs.readFile(outputPath, 'utf8');
+    expect(csv).toContain('Name,Age');
+    expect(csv).toContain('Alice,30');
+  });
+
+  it('converts CSV to HTML as a table', async () => {
+    const outputPath = path.join(tmpDir, 'from-csv.html');
+    const entry = resolve('csv', 'html');
+
+    await entry.convert(csvFixturePath, outputPath);
+
+    const html = await fs.readFile(outputPath, 'utf8');
+    expect(html).toContain('<table>');
+    expect(html).toContain('<td>Alice</td>');
+  });
+
+  it('converts HTML table to CSV', async () => {
+    const inputPath = path.join(tmpDir, 'fixture-table.html');
+    await fs.writeFile(
+      inputPath,
+      '<html><body><table><tr><td>Name</td><td>Age</td></tr><tr><td>Alice</td><td>30</td></tr></table></body></html>'
+    );
+    const outputPath = path.join(tmpDir, 'from-html.csv');
+    const entry = resolve('html', 'csv');
+
+    await entry.convert(inputPath, outputPath);
+
+    const csv = await fs.readFile(outputPath, 'utf8');
+    expect(csv).toContain('Name,Age');
+    expect(csv).toContain('Alice,30');
+  });
+
+  it('converts CSV to a Markdown table', async () => {
+    const outputPath = path.join(tmpDir, 'from-csv.md');
+    const entry = resolve('csv', 'md');
+
+    await entry.convert(csvFixturePath, outputPath);
+
+    const markdown = await fs.readFile(outputPath, 'utf8');
+    expect(markdown).toContain('| Name | Age |');
+    expect(markdown).toContain('| Alice | 30 |');
+  });
+
+  it('converts a Markdown table to CSV', async () => {
+    const inputPath = path.join(tmpDir, 'fixture-table.md');
+    await fs.writeFile(inputPath, '| Name | Age |\n| --- | --- |\n| Alice | 30 |\n');
+    const outputPath = path.join(tmpDir, 'from-md.csv');
+    const entry = resolve('md', 'csv');
+
+    await entry.convert(inputPath, outputPath);
+
+    const csv = await fs.readFile(outputPath, 'utf8');
+    expect(csv).toContain('Name,Age');
+    expect(csv).toContain('Alice,30');
+  });
+
+  it('converts CSV to tab-delimited TXT', async () => {
+    const outputPath = path.join(tmpDir, 'from-csv.txt');
+    const entry = resolve('csv', 'txt');
+
+    await entry.convert(csvFixturePath, outputPath);
+
+    const text = await fs.readFile(outputPath, 'utf8');
+    expect(text).toContain('Name\tAge');
+    expect(text).toContain('Alice\t30');
+  });
+
+  it('converts tab-delimited TXT to CSV', async () => {
+    const inputPath = path.join(tmpDir, 'fixture.txt');
+    await fs.writeFile(inputPath, 'Name\tAge\nAlice\t30\n');
+    const outputPath = path.join(tmpDir, 'from-txt.csv');
+    const entry = resolve('txt', 'csv');
+
+    await entry.convert(inputPath, outputPath);
+
+    const csv = await fs.readFile(outputPath, 'utf8');
+    expect(csv).toContain('Name,Age');
+    expect(csv).toContain('Alice,30');
+  });
+
+  it('converts CSV to DOCX containing a table', async () => {
+    const outputPath = path.join(tmpDir, 'from-csv.docx');
+    const entry = resolve('csv', 'docx');
+
+    await entry.convert(csvFixturePath, outputPath);
+
+    const mammoth = await import('mammoth');
+    const result = await mammoth.default.convertToHtml({ path: outputPath });
+    expect(result.value).toContain('Alice');
+    expect(result.value).toContain('<table>');
+  });
+
+  it('converts DOCX table to CSV', async () => {
+    const outputPath = path.join(tmpDir, 'from-docx.csv');
+    const entry = resolve('docx', 'csv');
+
+    await entry.convert(path.join(tmpDir, 'from-csv.docx'), outputPath);
+
+    const csv = await fs.readFile(outputPath, 'utf8');
+    expect(csv).toContain('Alice');
+  });
+
+  it('converts CSV to a valid PDF', async () => {
+    const outputPath = path.join(tmpDir, 'from-csv.pdf');
+    const entry = resolve('csv', 'pdf');
+
+    await entry.convert(csvFixturePath, outputPath);
+
+    const detected = await detectInputMime(outputPath);
+    expect(detected.mime).toBe('application/pdf');
+  }, 20000);
+
+  it('converts XLSX to HTML as a table', async () => {
+    const outputPath = path.join(tmpDir, 'from-xlsx.html');
+    const entry = resolve('xlsx', 'html');
+
+    await entry.convert(xlsxFixturePath, outputPath);
+
+    const html = await fs.readFile(outputPath, 'utf8');
+    expect(html).toContain('<td>Bob</td>');
+  });
+
+  it('converts HTML table to XLSX', async () => {
+    const inputPath = path.join(tmpDir, 'fixture-table-2.html');
+    await fs.writeFile(
+      inputPath,
+      '<html><body><table><tr><td>Name</td><td>Age</td></tr><tr><td>Carol</td><td>40</td></tr></table></body></html>'
+    );
+    const outputPath = path.join(tmpDir, 'from-html.xlsx');
+    const entry = resolve('html', 'xlsx');
+
+    await entry.convert(inputPath, outputPath);
+
+    const workbook = new ExcelJS.Workbook();
+    await workbook.xlsx.readFile(outputPath);
+    const [worksheet] = workbook.worksheets;
+    expect(worksheet.getRow(2).values.slice(1)).toEqual(['Carol', '40']);
+  });
+
+  it('extracts PDF text into a CSV row (best-effort)', async () => {
+    const pdfDoc = await PDFDocument.create();
+    const page = pdfDoc.addPage([600, 400]);
+    const font = await pdfDoc.embedFont(StandardFonts.Helvetica);
+    page.drawText('Extractable fixture text', { x: 50, y: 350, size: 24, font });
+    const bytes = await pdfDoc.save();
+    const inputPath = path.join(tmpDir, 'fixture.pdf');
+    await fs.writeFile(inputPath, bytes);
+
+    const outputPath = path.join(tmpDir, 'from-pdf.csv');
+    const entry = resolve('pdf', 'csv');
+
+    await entry.convert(inputPath, outputPath);
+
+    const csv = await fs.readFile(outputPath, 'utf8');
+    expect(csv).toContain('Extractable fixture text');
+  });
+});