Grayscale PDF
OptimizeRender every page in grayscale to make a smaller, print-friendly black-and-white PDF. Ideal for cheap printing or e-ink readers.
How to use Grayscale PDF
- Open this page in any modern web browser — no download or installation required.
- Click Add file or drag and drop your PDF onto the drop zone.
- Adjust the available settings to fit your needs.
- Click the action button and save the processed file — the result is ready instantly.
Pages are rasterised in your browser at the chosen scale, then converted to grayscale JPEGs and packed into a new PDF.
Files never leave your browser. No upload to any server.
Processing runs locally on your device. No queues, no waiting.
No signup, no watermarks, no limits. Use as many times as you like.
Why use Grayscale PDF on PDF Modern?
PDF Modern’s grayscale pdf tool processes your file entirely within your web browser using modern WebAssembly technology. Unlike traditional online PDF services that require uploading your documents to remote servers, your files never leave your device — ensuring complete privacy and security. Processing happens at the full speed of your CPU, not limited by upload or download bandwidth, so even large files are handled in seconds. There are no file-size restrictions, no daily usage caps, no watermarks on output, and no account creation needed. It is a fully free, open tool built for everyday document workflows at home, school or the office.
Frequently asked questions
Will the file size shrink?
Often yes — colour images become single-channel JPEGs which compress much smaller.
Is the original text still searchable?
Pages are rasterised, so the result behaves like a scanned document. Run OCR PDF afterwards if you need a text layer.