diff --git a/src/worker.js b/src/worker.js
index 6f56b3a..499d28b 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -33,7 +33,7 @@ async function processJob(pool, config, job) {
     }
 
     const startedAt = Date.now();
-    await withTimeout(entry.convert(inputFilePath, outputFilePath), JOB_TIMEOUT_MS);
+    await withTimeout(entry.convert(inputFilePath, outputFilePath, { quality: job.quality }), JOB_TIMEOUT_MS);
     const conversionDurationSeconds = (Date.now() - startedAt) / 1000;
     const { size: outputSizeBytes } = await fs.stat(outputFilePath);
 
diff --git a/test/worker.test.js b/test/worker.test.js
index fdfa591..d5fedf6 100644
--- a/test/worker.test.js
+++ b/test/worker.test.js
@@ -2,6 +2,7 @@ import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
 import fs from 'node:fs/promises';
 import path from 'node:path';
 import os from 'node:os';
+import sharp from 'sharp';
 import { getPool, closePool } from '../src/db.js';
 import { loadConfig } from '../src/config.js';
 import { ensureStorageDirs, uploadPath, outputPath } from '../src/storage.js';
@@ -66,6 +67,58 @@ describe('processPendingJobs', () => {
     expect(stat.size).toBeGreaterThan(0);
   });
 
+  it('passes the job quality through to the converter, shrinking output for a low quality value', async () => {
+    const lowUuid = 'eeeeeeee-eeee-4eee-8eee-eeeeeeeeeeee';
+    const defaultUuid = 'ffffffff-ffff-4fff-8fff-ffffffffffff';
+
+    const noisyBuffer = await sharp({
+      create: {
+        width: 256,
+        height: 256,
+        channels: 3,
+        noise: { type: 'gaussian', mean: 128, sigma: 40 },
+      },
+    })
+      .png()
+      .toBuffer();
+
+    for (const uuid of [lowUuid, defaultUuid]) {
+      await fs.writeFile(uploadPath(config, uuid, 'png'), noisyBuffer);
+    }
+
+    await createJob(pool, {
+      uuid: lowUuid,
+      family: 'image',
+      sourceFormat: 'png',
+      targetFormat: 'jpg',
+      originalFilename: 'noisy.png',
+      inputPath: `${lowUuid}.png`,
+      inputMimeType: 'image/png',
+      inputSizeBytes: noisyBuffer.length,
+      expiresAt: new Date(Date.now() + 3600 * 1000),
+      quality: 5,
+    });
+    await createJob(pool, {
+      uuid: defaultUuid,
+      family: 'image',
+      sourceFormat: 'png',
+      targetFormat: 'jpg',
+      originalFilename: 'noisy.png',
+      inputPath: `${defaultUuid}.png`,
+      inputMimeType: 'image/png',
+      inputSizeBytes: noisyBuffer.length,
+      expiresAt: new Date(Date.now() + 3600 * 1000),
+    });
+
+    await processPendingJobs(pool, { ...config, workerConcurrency: 2 });
+
+    const lowJob = await getJobByUuid(pool, lowUuid);
+    const defaultJob = await getJobByUuid(pool, defaultUuid);
+    expect(lowJob.status).toBe('done');
+    expect(defaultJob.status).toBe('done');
+    expect(lowJob.outputSizeBytes).toBeLessThan(defaultJob.outputSizeBytes);
+  });
+
   it('marks a job failed with a safe message and a detailed log when the converter throws', async () => {
     const uuid = 'aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa';
     await createJob(pool, {