# Convert PDF to Grayscale

> Colour spaces are remapped to DeviceGray rather than rasterising the page, so text and line art stay crisp at any zoom while ink-heavy prints get cheaper. Scan-heavy files often shrink 30 to 60 percent without re-encoding images. Bookmarks, form fields, and annotations carry through unchanged.


Live tool: https://lofttools.com/tools/pdf-tools/pdf-grayscale

Category: PDF & Documents

## How it works

1. **Select PDF** — Drop the colour PDF you want greyscaled, or click to pick one
2. **Convert** — All colors are converted to grayscale tones
3. **Download** — Download your grayscale PDF instantly

## FAQ

### Does grayscale reduce file size?

Yes. Removing color information can significantly reduce file size, especially for image-heavy PDFs.

### Does this preserve bookmarks and form fields?

Yes. Conversion to grayscale only re-encodes color spaces; bookmarks, form fields, and annotations all carry through unchanged.

### What PDF versions are supported?

Grayscale conversion works on PDF 1.0 through 2.0. Colour spaces in the input are remapped to DeviceGray on output.

## Tips

- **Vectors stay vector** — Color spaces are remapped to DeviceGray rather than rasterising the page, so text and line art stay crisp at any zoom.
- **Shrinks image-heavy PDFs** — Removing the color channel often cuts size by 30 to 60 percent on scan-heavy files without re-encoding the images.
- **Color file never leaves the tab** — Conversion runs in your browser. The original color PDF stays on disk; a grayscale copy downloads beside it.

## Privacy — what we do not do

This tool runs entirely in the browser via WebAssembly. Your file never reaches a Loft Tools server. Specifically:

- **No upload.** The file bytes load into the browser tab's memory and process on your own CPU. Open DevTools → Network and observe zero outbound requests carrying file data while Convert PDF to Grayscale runs.
- **No AI training on your file.** Loft does not train models. We could not train on a file we cannot see.
- **No content scanning.** No virus, copyright, or content-moderation pass against your file. The bytes are not accessible to us.
- **No server-side log of file contents, filenames, or EXIF metadata.** Cloudflare edge captures URL and truncated IP for abuse defense (standard CDN behaviour). Cloudflare Web Analytics records anonymous page hits, no cookies, no PII. Nothing about your file content reaches any log.
- **No retention.** Close the tab and the file leaves browser memory. No backups exist on our side because no copy ever existed on our side.
- **No account.** No email, no signup, no auth, no telemetry tied to you.
- **Offline-capable after first visit** (PWA). Once you've loaded a tool, it caches; later sessions work without internet. For high-sensitivity files, run the tool once online to warm the cache, then disconnect before processing.

Compare with upload-based services: each transmits your file to a processing server. Even over HTTPS, each has logs, retention windows, and subpoena exposure. Loft has none of these because the server architecture does not include your file.

## More

- All tools: https://lofttools.com/tools
- Category: https://lofttools.com/tools/pdf-tools
- LLM index: https://lofttools.com/llms.txt