PDFMaxCompare PDF Files and Find the Differences
Need to know exactly what changed between two versions of a document? PDFMax lets you compare two PDF files and find every difference in seconds. Upload an old and a new file, and the tool highlights what was added, removed or edited so nothing slips past you. It is perfect for checking contract revisions, reports, invoices or any document you receive more than once. The Compare PDF tool is completely free, needs no signup and no software to install. It runs in your browser and works on both mobile and desktop, so you can review changes anywhere, anytime.
Compare PDF →100% freeNo signupWorks in your browser
Why PDFMax
- Spot every difference between two PDFs — added, removed and changed text is highlighted so revisions are easy to review.
- 100% free with no signup, no watermark and no software to install.
- Works in any browser on mobile and desktop — compare documents on your phone or laptop.
- Simple two-file workflow: upload the old and new version and see the results right away.
How to compare PDF
- Open the Compare PDF toolGo to the Compare PDF page on PDFMax in any browser. There is nothing to download or install.
- Upload both PDF filesAdd the first (original) PDF and the second (updated) PDF you want to compare.
- Run the comparisonStart the comparison and let the tool scan both documents to find the differences between them.
- Review the differencesSee the changes highlighted between the two files so you can quickly check exactly what was added, removed or edited.
Frequently asked questions
Is the Compare PDF tool free?
Yes. Comparing two PDF files on PDFMax is completely free. There is no signup, no subscription and no watermark on the results.
Do I need to install software or create an account?
No. The tool runs entirely in your browser. You do not need to install any program or register to compare your PDFs.
Can I compare PDFs on my phone?
Yes. PDFMax works in any modern mobile or desktop browser, so you can compare two PDF files from your phone, tablet or computer.
How does the tool show the differences?
After you upload both files, the tool scans them and highlights the differences so you can quickly see what was added, removed or changed between the two versions.
Are my documents safe?
Your files are only used to perform the comparison you requested and are not shared. For sensitive documents you can simply close the page when you are done.
How many files can I compare at once?
The tool compares two PDF files at a time — an original and an updated version. To check another pair, just upload a new set of files.