Skip to content
ConvertFileConvertFile

Compare PDFs

See every word added, removed or changed between two versions of a document.

Runs in your browser. Your file is never uploaded.

Compare PDFs in short

Add the original PDF and the revised PDF, then select Compare. We read both and match them word by word, then review the list of changes, and download both files with the changes highlighted. It's free, there's no sign-up, and it runs in your browser, so the file never leaves your device.

How to use Compare PDFs

  1. 1Add the original PDF and the revised PDF.
  2. 2Select Compare. We read both and match them word by word.
  3. 3Review the list of changes, and download both files with the changes highlighted.

Good to know

  • Compares the text, not the layout. Changes to images, fonts, colours or spacing are not reported.
  • Text that moved to another page is still matched, so a reflowed document doesn't show as rewritten.
  • Additions are highlighted in green on the revised file, removals in red on the original.
  • Scanned PDFs have no text to compare.
  • Multi-column pages and tables can be read in a different order in each file, which can show up as extra changes.
  • This tool runs in your browser. Very large files depend on your device's memory.

Compare PDFs: common questions

Is Compare PDFs free?
Yes. Compare PDFs is free and works without an account, for files up to 25 MB and 150 pages. A free account raises that to 50 MB and 400 pages.
Are my files uploaded to a server?
No. Compare PDFs runs in your web browser, so the file is read on your own device and never sent to ConvertFile.
Does Compare PDFs find changes in images or formatting?
No. It compares the words in both files, in reading order. Changes to images, fonts, colours or layout aren't reported.
Can I compare a scanned PDF?
Not yet. Scans are pictures of text with no text layer, so there are no words to compare.
Does Compare PDFs work on Mac, Windows, Android and iPhone?
Yes. It runs in any modern web browser, with nothing to install. Very large files work best on a desktop or laptop, because in-browser tools use your device's memory.

Related tools

More in Document intelligence