Diff MasterCompare extractable wording or rendered page appearance, with a 50 MB and 150-page limit per file.
How to compare PDF filesWhat do you want to compare?PDF, Excel, text, code, JSON or Markdown — online and free.
Choose a format and start in seconds. Everything runs privately in your browser.
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Up to 50 MB · 150 pages eachCompare two PDF files
Choose both PDF files to continue.
No uploads.Your files never leave your device.
Browser private.Comparison runs in this tab.
No account.Start without signing up.
Free.No paywall for these tools.
Preparing required files for offline use…CHROME SIDE PANEL
Use Diff Master in Chrome.
Keep all six local comparison tools beside your current tab, without sending comparison content to Diff Master.
Compare files or text in three clear steps
No account, upload queue or saved comparison history.
- 01Choose the right formatUse the dedicated PDF, Excel, text, code, JSON or Markdown tool.
- 02Add both versionsSelect local files or paste the original and changed content.
- 03Review every changeMove through additions, removals and modifications in context.
Six focused diff tools, not six look-alike pages
Use JSON Diff for object paths, Code Compare for source review, and Markdown Diff for document structure.
JSON Diff vs Text DiffCompare Excel or CSV sheets by stable keys or row position without recalculating formulas.
Compare Excel rows by keyAbout this free online diff tool
Does Diff Master upload or store my files?
No. Comparisons run in this browser tab, and Diff Master does not upload or save your files, pasted content or results.
Which comparison tool should I choose?
Choose PDF for wording or page appearance, Excel or CSV for sheet data, Text for plain text, Code for source files, JSON for structured data and Markdown for document structure.
Is every tool free and available without an account?
Yes. The currently published comparison tools are free to use, require no account and have no paywall.