PDF Comparison: Compare Two PDF Files
Compare two PDF files word by word and get a page by page report with added words in green and removed words in red. Runs in your browser, nothing is uploaded.
Most tools never upload your files
Compare Two PDF Files and Find Differences
Comparing PDFs
Got two versions of a document and need to see what changed? Contract drafts, report revisions, updated manuals, comparing them page by page by hand is slow and easy to get wrong. This automates it by comparing the text of both PDFs word by word and highlighting every difference.
Upload
Add exactly two PDFs: the original first, then the modified version. Shows file name and size for each.
What the Comparison Shows
What you get:
- Totals: Words added and words removed, plus the number of pages compared
- Report: A page by page view of the new version's text with every change marked
- Identical check: A clear notice when no text differences were found
Start Comparing
Click "Compare PDFs". Tool compares page by page, word by word, looking for:
- Text changes: words added or deleted
- Each page is compared with the page of the same number in the other file
- Missing pages: text on extra pages shows up as added or removed
In-browser. Docs never upload anywhere.
Results
After comparing, see:
- Words added
- Words removed
- A report you can download and open in any browser
The report shows each page's text with color-coded highlighting showing exactly what differs.
Reading the Report
In the report:
- Scroll through all pages
- Each page has its own heading
- Use your browser's search to find a word
Understanding Highlights
Changes show highlighted:
- Added: New words highlighted in green
- Removed: Deleted words in red, struck through
- Modified: A changed word shows as one removed and one added
Formatting, images and layout are not compared, only the text.
Export
After reviewing:
- Download the report as an HTML file
- Share findings with colleagues
- Document what changed between versions
Uses
Good for:
- Legal: Compare contract versions for unauthorized changes
- Writers/Editors: Track edits between drafts
- QA Teams: Check consistency across releases
- Business: Monitor policy updates
- Academic: Compare paper revisions
Tips
For best results:
- Scanned PDFs have no text: run both through PDF OCR first
- Put the original first and the new version second
- Very long pages are compared up to about 3,000 words each
Compares the text content of both files in your browser, so your documents never leave your device. Saves hours of manual work and makes sure no wording change gets missed.
Features
- Visual comparison
- Text difference
- Side-by-side view
- Highlight changes
Frequently asked questions
How do I compare two PDF files?
Add exactly two PDFs, the original first and the new version second, then click Compare PDFs. You get a summary of words added and removed, plus a report you can download and open in any browser.
What does the comparison report show?
The report goes page by page and shows the text of the new version with added words highlighted in green and removed words in red. The totals at the top tell you at a glance how much changed.
Does it find changes in images or formatting?
No. The tool compares the text only, word by word. Changes to images, colors, fonts or layout are not detected.
Can I compare scanned PDFs?
Scans contain pictures of text, not real text, so there is nothing to compare. Run both files through PDF OCR first, then compare the searchable versions.
Why do some changes appear on the wrong page?
Pages are compared with the page of the same number in the other file. If text was added that pushes content onto the next page, the moved words show up as removed on one page and added on the next.
Are my PDFs uploaded?
No. Both files are read and compared in your browser, so contracts and drafts never leave your device.