Compare PDFs
Compare two PDFs free — see added and removed lines per page plus a page-count summary, with a downloadable diff report. Private, in your browser.
About the Compare PDFs
Spot exactly what changed between two versions of a document. This tool extracts the text of both PDFs with pdf.js and runs a line-by-line comparison for each page, highlighting the lines that were added in green and removed in red. It also reports whether the two files have the same number of pages.
It is ideal for checking edits between contract drafts, comparing report revisions, or confirming that a re-exported PDF matches the original. You can read the differences on screen and download a plain-text diff report to keep or share.
This is a text comparison, so it catches wording changes but not purely visual differences like fonts, colours or image edits. Both files are read entirely in your browser and never uploaded.
How to Use the Compare PDFs
- 1Upload the original PDF and the changed PDF.
- 2Click Compare to extract and diff the text.
- 3Review the per-page added and removed lines.
- 4Download the diff report if you want a copy.
Frequently Asked Questions
How does the comparison work?
The text of each page in both PDFs is extracted and compared line by line. Lines that appear only in the new file are shown as additions, and lines only in the original are shown as removals, so you can see exactly what wording changed.
Does it detect visual or layout changes?
No. This is a text comparison — it finds wording differences but not changes to fonts, colours, spacing or images. For a visual diff, render both PDFs to images and compare those.
What if the two PDFs have different page counts?
The summary reports the page count of each file and flags the mismatch. Pages are compared in order, so extra pages in one file show up as wholly added or removed content.
Are my files uploaded?
No. Both PDFs are read and compared entirely in your browser with pdf.js, so neither file leaves your device.