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SnapOtter/apps/docs/tools/pdf/grayscale-pdf.md
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SnapOtter 8532f3227b docs: audit all 157 tool pages against live schemas
Reconcile every tool page's parameters, defaults, and response shape against the tool's Zod settings schema and executionHint in code. Notable fixes: color-palette (add count + format params, hex output, median-cut algorithm), favicon (add 5 params, was documented as having none), qr-generate (add logoDataUri), convert (add ppm/eps/tga formats), video-loudnorm (-16 LUFS not -14), smart-crop (async 202 not sync 200), images-to-video (1080x1080 square), and several output-filename and behavior-note corrections.

Also normalize API endpoint paths to /api/v1/tools/<id> (no modality segment) and standardize curl examples on the Docker API port 1349. Verified with a clean docs build.
2026-06-18 14:12:28 +08:00

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---
description: Convert all colors in a PDF to grayscale.
---
# Grayscale PDF
Convert all colors in a PDF to grayscale, producing a black-and-white version of the document.
## API Endpoint
`POST /api/v1/tools/grayscale-pdf`
Accepts multipart form data with a PDF file. No `settings` field is required.
## Parameters
This tool has no settings parameters. Upload the PDF file directly.
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/grayscale-pdf \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@document.pdf"
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/document.pdf",
"originalSize": 3200000,
"processedSize": 2800000
}
```
## Notes
- All color spaces (RGB, CMYK) are converted to grayscale, including embedded images, vector graphics, and text.
- The output file is often smaller than the original because grayscale data requires fewer bytes per pixel.