Is this PDF compare tool free?
Yes. It's completely free with no signup and no watermark, and there's no page limit built into pricing — just the practical cap noted below.
PDF Tools
PDF Compare
Compare two PDFs and see exactly what changed, page by page, right in your browser — no upload, no signup.
Document A
Supports: PDF
Max file size: 30MB
Document A (original)
or drag and drop here
PDF only · Up to 30 MB
Files are processed securely in your browser. Nothing is uploaded.
Document B
Supports: PDF
Max file size: 30MB
Document B (revised)
or drag and drop here
PDF only · Up to 30 MB
Files are processed securely in your browser. Nothing is uploaded.
How to use
- Upload both PDFs
Add the original and the revised version.
- Compare
Every page is rendered and diffed, right in your browser.
- Review
Differing pages are marked — changed areas are highlighted red.
- Download
Save a diff image for any page you need to share.
Why ToolerWork?
Fast
Runs directly in your browser, no waiting in a queue.
Private
Processed locally — your PDFs never leave your device.
Easy to Use
No signup or account required.
Related Tools
View AllHow to compare two PDF files
- Upload Document A (the original) and Document B (the revised version).
- Click Compare PDFs — every page is rendered and diffed in your browser.
- Use the page grid to jump to any page — red means it differs, green means it matches.
- Download a diff image for any page you need to share.
Useful for reviewing contract revisions, comparing document drafts, checking whether a form template changed, or spotting what's different between two scanned copies of the same document.
PDF Compare FAQ
Are my PDFs uploaded to a server?
No. Both files are rendered and compared entirely in your browser using PDF.js — they never leave your device.
How does it decide what counts as a difference?
Each page from both documents is rendered to an image at the same scale, then compared pixel by pixel. Areas that differ are highlighted in red; unchanged areas are shown faded so you can still see the surrounding context.
What if the two PDFs have different page counts?
You'll see a clear notice, and the tool compares the first N pages, where N is the smaller of the two page counts.
Is there a page limit?
Up to 30 pages are compared per run, and each file must be under 30MB — this keeps browser-based rendering fast and reliable.
Related PDF workflows
About this tool
Compare
Compare two PDF files page by page and see exactly what changed, highlighted directly on the page.
When a PDF comes back as a second draft, a signed copy, or a resubmitted form, reading both versions side by side to spot what changed is slow and error-prone. This tool renders both PDFs in your browser, aligns matching pages, and highlights areas that differ so changes are visible at a glance instead of buried in a wall of text. It handles files with a different number of pages, and a light blur step keeps normal rendering noise (fonts drawing a few pixels differently between two independently generated PDFs) from showing up as false differences, so only real content changes get flagged.
Best for
contract revisions, resubmitted forms, and catching edits in updated documents
Input
two PDF files to compare
Output
a page-by-page visual diff with changes highlighted
How to use this tool
- Upload the original PDF and the revised PDF.
- Wait while each page renders and aligns automatically.
- Review pages flagged as different, with changed areas highlighted.
- Step through page by page to confirm exactly what changed.
Why users choose this tool
- Focused workflow for contract revisions, resubmitted forms, and catching edits in updated documents.
- No-install workflow for quick PDF actions.
- Consistent output for business and academic documents.
- Time savings versus manual page-level editing.
- Reliable a page-by-page visual diff with changes highlighted generation with fewer manual steps.
Common use cases
- Check what changed between two drafts of a contract or agreement.
- Verify a resubmitted form matches what was requested.
- Confirm a signed copy matches the original before filing.
- Catch accidental edits in a document that should be identical to a previous version.
When to choose this tool
Compare is usually faster than manual pdf workflows because it reduces repetitive steps and keeps the complete flow in one interface. Compared with heavyweight desktop software, this tool prioritizes speed, accessibility, and simpler controls so users can finish routine tasks quickly without installation or licensing friction. For users who mainly need contract revisions, resubmitted forms, and catching edits in updated documents, this focused approach often gives better execution speed and cleaner day-to-day usability, while still producing a page-by-page visual diff with changes highlighted that is suitable for practical work.
Privacy-first: Where browser-based processing is available, your files stay on your device. No file is uploaded to our servers unless strictly required for the tool to function.
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