Invert the colours of a PDF
Make a dark-mode copy for reading at night. Everything runs on your device.
- Your files are never uploaded
- Processed on your device
- Works offline
- Free, no sign-up
Drop your PDF files here
PDF files · up to 10 files, 500 MB each
or paste with Ctrl+VLive preview
Settings
How it works
Add your PDF
Papers, books or notes.
Choose a style
Dark mode keeps colours; negative flips everything.
Download
Read it in any PDF app.
Easier on the eyes
Dark mode makes the page background dark and text light, while red stays red and blue stays blue. Full negative flips every colour, like a photo negative.
The pages become pictures, so text cannot be selected.
Private
Your file is processed inside your browser with PDF.js (Apache-2.0) and pdf-lib. It is never uploaded, and nothing is saved after you close the page.
Questions
Are my files uploaded?
No. The tool runs inside your browser, so your files are opened and changed on your own device. They are never sent to us or to anyone else.
Do photos look strange?
In full negative mode, yes. Dark mode keeps photos closer to their colours.
Is it free?
Yes. Free to use, with no sign-up, no watermark and no daily limits.
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