Compare PDF
Add the original and the new version. See every added and removed word, or overlay the pages.
or drop PDFs anywhere on this page
Processed on your device. Nothing is uploaded.
Done
DownloadAbout Compare PDF
Compare PDF shows what changed between two versions of a document. Text mode highlights every added word in green and every removed word in red, side by side, with a clickable list of changes. Overlay mode stacks the pages to reveal changes in drawings, images and layout.
Both files are compared in your browser and never uploaded, which makes it safe for contracts and confidential drafts.
Why use hellpdf
- Word-level differences
- Side-by-side highlights
- Visual overlay for scans and drawings
- No upload
How to compare PDF
- Add your file. Pick it or drop it on the page. It's read by your browser and never uploaded.
- Check the preview. Thumbnails show every page. Click one to read it full size.
- Download. Your file is ready right away. Close the tab and it's gone.
Compare PDF: frequently asked questions
Can it compare scanned PDFs?
Yes, with Overlay mode, which compares how the pages look. Text mode needs PDFs with text.
What if pages were added in the middle?
Text comparison handles that: it matches the documents word by word, not page by page.
Is it safe for confidential files?
Your file never leaves your device: hellpdf does this in your browser, so nothing is uploaded and there’s no file size limit beyond what your device can handle.
Is it really free?
Yes. It’s free with no sign-up, no watermark and no daily limit on the tools that run in your browser.