PDF to Grayscale
PDF to Grayscale — right in your browser, nothing uploaded.
Drag & drop your PDF here, or click to choose. Everything runs in your browser — nothing is uploaded.
This free tool converts every page of a colour PDF to grayscale, which is what most print shops charge far less for and what many document-submission systems require. Colours are converted using proper luma weighting rather than a crude average, so contrast stays natural and text remains sharp. It all runs in your browser — the PDF is never uploaded.
Frequently Asked Questions
How do I use the PDF to Grayscale tool?
Drop your file onto the box above (or click to choose), set any options you need, then press the button and the finished file downloads immediately. Nothing is uploaded and there is no signup or watermark.
Is my PDF uploaded anywhere?
No. The file is opened and processed directly in your browser using JavaScript, and never leaves your device — nothing is sent to a server at any point. That is what makes it safe for contracts, invoices, medical records and other confidential documents, and it is why the tool still works with your network disconnected.
Will the text still be readable?
Yes. The conversion uses the Rec. 601 luma formula, which weights red, green and blue the way the human eye perceives brightness, so coloured text and highlights keep sensible contrast instead of turning into muddy similar-looking greys. Raise the resolution setting if you need finer detail.
Is there a file size or page limit?
There is no limit imposed by us, because nothing is uploaded — the only real constraint is your device’s memory. Documents of a few hundred pages are fine on a normal computer; very large scanned files are more comfortable on a desktop browser than on a phone.
Does it work on Mac, Windows, iPhone and Android?
Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone and Android with nothing to install and no account needed. Once the page has loaded it keeps working offline, so you can use it on a plane or a locked-down network.