Compare two PDFs online
Open the original and the revised version. Every changed, added and removed word is listed, boxed on both documents and kept side by side as you scroll.
- Free, no sign-up
- Files never leave your browser
- No watermarks
Drop a PDF here
The original or approved version.
Drop a PDF here
The version you want to check against the reference.
Everything you need to review a revised PDF
Built for contracts, specifications, reports and forms, where a missed change costs real money.
Synced side-by-side view
Both documents scroll together and stay aligned on matching text, even when a paragraph was added on one side.
Every difference in one list
Changes, additions, deletions and form-field edits are listed in reading order with their page numbers.
Marked on both documents
Each finding is boxed and numbered on the reference and the checked PDF. Click it in the list to jump straight there.
Edit fillable forms
Type into text fields, tick checkboxes and pick options directly on the checked PDF, then save the filled file.
Undo and redo
Step back and forward through your form edits with the toolbar or Ctrl+Z and Ctrl+Shift+Z.
Export with findings
Download the checked PDF with every finding boxed and numbered, plus a summary page listing each change.
More PDF tools
Merge, split, compress and convert PDFs with the same privacy: nothing leaves your device.
- Merge PDFCombine several PDFs into one file in the order you want.
- Split PDFSplit a PDF into single pages or custom page ranges.
- Compress PDFMake a PDF smaller for email and uploads.
- PDF to JPGTurn each PDF page into a JPG or PNG image.
- JPG to PDFTurn photos and scans into a single PDF.
- Organize PDFReorder, rotate and delete pages in one place.
- Rotate PDFRotate single pages or the whole document.
- Remove pagesDelete the pages you do not need from a PDF.
- Extract pagesCopy selected pages into a new PDF.
- Add page numbersNumber the pages of a PDF where you want.
- Watermark PDFStamp text such as CONFIDENTIAL on every page.
Your files stay on your device
Comparison runs entirely in your browser. There is no upload step, no server copy and no account.
- PDFs are read and compared on your computer or phone.
- Nothing is sent to our servers, so confidential documents stay confidential.
- Close the tab and the files are gone. Saved and exported files go straight to your device.
How it works
Open the reference PDF
Drop the original or approved version into the left pane.
Open the version to check
Drop the revised file into the right pane. The comparison starts immediately.
Review and export
Walk through the findings list, fix form fields if needed and export the marked-up PDF.
Frequently asked questions
Is compare2pdf free?
Yes. Every feature is free with no sign-up, no page limit and no watermark. The site is funded by advertising.
Are my files uploaded anywhere?
No. Your PDFs are opened and compared inside your browser. They are never sent to our servers or stored by us.
What kinds of differences are detected?
Changed, added and removed text, plus differences in fillable form fields such as text boxes, checkboxes and drop-down lists.
Does it work with scanned PDFs?
Scanned pages are images without selectable text, so text differences cannot be found yet. PDFs created from Word, Google Docs or other software work best.
Can I fill in or correct form fields?
Yes. Fillable fields in the checked PDF are editable. You can undo and redo changes and save the edited PDF.
What does Export with findings include?
A copy of the checked PDF with every finding boxed and numbered, followed by a summary page that lists each change with its page numbers.
Ready to compare?
Two PDFs, one minute, every change.