Are my documents uploaded when I compare them?

No. Both texts are compared entirely in your browser — PDF and DOCX text is extracted locally with pdf.js and mammoth. Your files never leave your device.

Can I compare a PDF with a Word document?

Yes. Load a PDF on one side and a DOCX (or paste text) on the other; the tool extracts the plain text from each and highlights the differences.

Compare Text & Documents Online — Free Diff Checker

Free online tool to compare two texts or documents and highlight the differences. Paste text or load a PDF, Word (DOCX) or TXT file — everything runs privately in your browser, nothing is uploaded.

✓ 100% Free ✓ No Login Needed ✓ NCERT / CBSE Aligned ✓ Download as PDF

TL;DR: Free online tool to compare two texts or documents and highlight the differences. Paste text or load a PDF, Word (DOCX) or TXT file — everything runs…

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 18, 2026

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A private diff checker for text, PDF and Word files. Paste two versions, or load a PDF, DOCX or TXT file into each side, and this tool highlights every added and removed line — all in your browser, nothing uploaded.

What you can do

Compare two texts — paste an original and a changed version to spot every edit.
Compare documents — load a PDF (text extracted with pdf.js), a Word DOCX (via mammoth) or a TXT file.
Colour-coded result — additions in green, removals in red, with an added/removed count.

100% free, no sign-up, nothing uploaded. Need to edit a PDF? Use the free PDF Tools, jot ideas in the Notepad, or browse all free tools.