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Free Compare PDF online
Find every word that changed between two PDFs.
Compare PDF is a free browser tool that lets you find every word that changed between two PDFs. Add your PDF, adjust the Compare PDF options if you need to, then download the result immediately. Compare PDF works on your device only, so no file or text is ever uploaded.
- Free to use
- No signup
- No uploads
- Works offline
Why use Compare PDF
- find every word that changed between two PDFs without installing software
- Your PDF is processed on your device by Compare PDF, never uploaded
- Compare PDF needs no account, email address or payment details
- Compare PDF is batch-friendly: reuse it immediately on the next file
- Compare PDF is keyboard accessible and screen-reader friendly
- Compare PDF is free forever, with no watermark on the result
Compare PDF runs entirely inside your browser. Your PDF is never uploaded, stored or shared, and nothing is retained once you close the tab.
How to use Compare PDF
- Add your PDF Drag your PDF onto the drop zone or pick it from your device.
- Adjust the options Set the options that control how Compare PDF handles your input.
- Run the tool Compare PDF works instantly on your device, with no queue and no upload wait.
- Download the result Save the finished file straight to your device, then reuse the tool as often as you like.
Benefits
Private by design
Your PDF stays on your device while Compare PDF works. Compare PDF never sends it to a server, so confidential work stays confidential.
Instant results
There is no upload step, so Compare PDF starts the moment you add your PDF.
No signup, no limits
Use Compare PDF as many times as you want. Compare PDF asks for no account, adds no watermark and keeps no paid tier gating the output.
Works offline
Once the page has loaded, Compare PDF keeps working without a connection, which helps on flights and locked-down networks.
Who it is for
For legal and finance teams
Legal and finance teams use Compare PDF to handle sensitive documents without installing software: find every word that changed between two PDFs on a shared or locked-down machine.
For HR and admin teams
Compare PDF helps HR and admin teams process paperwork quickly, since your PDF never leaves the laptop it was created on.
For freelancers
Compare PDF helps freelancers send client deliverables quickly, since your PDF never leaves the laptop it was created on.
How it works
Compare PDF loads your PDF into memory, applies the change you requested to the underlying data rather than to a screenshot of it, and writes a fresh copy for download. Your original stays untouched on disk, and every step of Compare PDF happens inside your browser sandbox.
Frequently asked questions
Is Compare PDF free to use?
Yes. Compare PDF is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does Compare PDF upload your PDF to a server?
No. Compare PDF processes your PDF inside your browser, so it never reaches a DocTools server. That also means the tool keeps working if your connection drops mid-task.
Is there a file size limit?
The practical ceiling is your device's available memory rather than a server quota. Files up to roughly 100 MB work comfortably on a typical laptop in Compare PDF.
Do I need to install anything to use Compare PDF?
No installation is needed. Compare PDF runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use Compare PDF on a phone or tablet?
Yes. The Compare PDF interface adapts to small screens and supports touch input, though very large jobs are faster on a desktop browser.
What happens to your PDF when I close the tab?
It is discarded. Compare PDF keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
Related tools
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- Text Similarity Checker | Compare two texts (Jaccard, Cosine, Levenshtein)
- Merge PDF | Combine multiple PDFs into one document
Last updated: 2026-09-07