How big a file can I use?

Up to 100 MB per file and 50 files per batch. There is no server queue behind that limit; the practical ceiling is your browser's memory, so split unusually large documents into two runs.

Does my file get uploaded?

No. The page reads the file through the browser's own file API and processes it in the tab. Closing the tab discards the working copy, which is why there is no storage to clear and no retention policy to read.

Can I use this on mobile?

The page is responsive and the work runs in the browser on the device, so a file you just downloaded or photographed can be processed without moving it to a computer first.

Is this free, or free until it asks for a card?

Free, with no upsell behind it: no account to create and no file-count quota that appears halfway through a job.

Convert PDF to Grayscale

Turn a color PDF into grayscale.

Drag & drop your PDF here

or click to browse — .pdf · up to 1 files

Every page is re-rendered through a grayscale filter. The result is image-based, which also shrinks color scans considerably.

Add a PDF first.

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About Convert PDF to Grayscale

Convert PDF to Grayscale is here for making a document lighter without wrecking it: turn a color PDF into grayscale. It takes PDF and produces PDF. Files up to 100 MB each, 50 at a time, and the work happens on your own machine rather than on a server.

The slow route to making a document lighter without wrecking it is installing something, making an account and uploading the file; this is the fast route.

How to use Convert PDF to Grayscale in 3 steps

Drop the file on the page — PDF, one file up to 100 MB.
Set the resampling settings for the images inside the file.
Press Convert PDF to Grayscale and download the PDF result.

What you get with Convert PDF to Grayscale

One job, done in the browser: turn a color PDF into grayscale.
Free to use, with no signup and no account
No watermark or logo added to your output
Works on desktop and mobile, no install

Convert PDF to Grayscale: questions

How big a file can I use?: Up to 100 MB per file and 50 files per batch. There is no server queue behind that limit; the practical ceiling is your browser's memory, so split unusually large documents into two runs.
Does my file get uploaded?: No. The page reads the file through the browser's own file API and processes it in the tab. Closing the tab discards the working copy, which is why there is no storage to clear and no retention policy to read.
Can I use this on mobile?: The page is responsive and the work runs in the browser on the device, so a file you just downloaded or photographed can be processed without moving it to a computer first.
Is this free, or free until it asks for a card?: Free, with no upsell behind it: no account to create and no file-count quota that appears halfway through a job.