Compare PDF Files
Visually compare two PDF files to find differences.
FREE - NO SIGN-UP - RUNS ON YOUR DEVICE
Your PDFs stay on your device
- Overlaidview
- Visualhighlighting
- Text & Imagechanges
- Privatecomparison
What you can count on
- 0files uploaded
- Comparison happens in your browser
- Your documents remain private
- 100%browser based
- No server processing is involved
- Get instant results without queues
- 2files at a time
- Compares one pair of PDFs
- Identifies visual differences
Compare PDF at a glance
- Input format
- Two PDFs, older one first
- Sensitivity
- A setting from 4 to 90
- What you see
- Both files, differences in red
- Downloads
- None, you read it on screen
- Where it runs
- In your browser tab
- Per-page result
- Per-page % changed
- Price
- Free
- Account required
- No
How to use Compare PDF
- 1
Add Your Two PDFs
Drag and drop the two PDF files you want to compare onto the page, or click to select them from your computer.
- 2
Run the Comparison
Both documents are drawn page by page and laid over each other. Anything that changed is marked in red on the combined image.
- 3
Review the Changes
Scroll through the documents to review the highlighted changes. The comparison is visual and is not saved to a separate file.
Frequently asked questions
Does this tool produce a summary report?
No, it provides a direct visual comparison by highlighting the differences on the pages themselves. There is no separate report file.
Can it compare text only?
The comparison is visual, so it detects changes in text, images, and layout. It cannot isolate text-only changes.
Why is the comparison process taking so long?
For large or complex PDFs, the comparison is computationally intensive. It depends on your computer's processing power, not our servers.
What happens if I switch to another tab while it works?
The work pauses and picks up where it left off when you come back. Browsers throttle hidden tabs, so a job left running in the background would slow to a crawl or stall outright.
Reviewing Document Revisions
Find changes between two versions of a PDF document. Each page is drawn from both files and laid one over the other, with changed areas marked in red.
- Compare two PDF versions to track changes in contracts or reports. Quickly spot modifications without reading both documents line by line.
- The visual comparison helps identify subtle layout shifts or image replacements that a text-only comparison might miss, showing what has been altered.
Full specification
| Input format | Two PDFs, the older one first. |
|---|---|
| Sensitivity | One setting, from 4 to 90, decides how small a difference is ignored. |
| What you see | Every page of both files drawn and lined up, with the differences under a red overlay. |
| Downloads | None. There is no file to save; you read the differences on screen. |
| Where it runs | In your browser tab. Both files stay on your device. |
| Per-page result | Each page reports its own figure, like 4.12% changed, or identical. Pages present in only one file are labeled as such. |
| Price | Free |
| Account required | No |
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