PDF to Grayscale Online works in the browser with local processing, preview and download. Files stay on your device.
Files are not sent to a server. Processing runs in your browser, and the queue handles one file at a time so the device stays responsive.
Drop PDF files here
or tap to choose several files
No files selected.
Pages are converted to gray through canvas and assembled back as images. Text in the result remains non-editable.
In queue0
Done0
Size saving-
Add PDF files.
Preview
How to use it
Add the files, choose the tool settings and check the first result before processing the full queue.
Recommended settings
Start with the default values, then adjust one control at a time and review the preview. On phones, process fewer large files in one batch.
Privacy
Your files are not uploaded to a server. The editor runs in your browser with local libraries from this site.
Limits
Large images can take longer on phones. If the browser slows down, process fewer files at once or choose a smaller output format.