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In-browser PDF compare

See every pixel that changed

Overlay two PDF revisions and catch every changed pixel — plus word-level text, metadata, and form-field diffs, with drag-rect exclusion zones. Built for dense AEC drawings.

Launch Compare PDF
  • Pixel-level diff
  • Word-level text
  • Form fields
  • Exclusion zones
  • Jump to change
Compare PDF showing two engineering blueprints side by side. Rev A on the left, Rev B on the right. Red highlights mark regions where dimension callouts and hole counts changed.
Pictured: blueprint Rev A vs Rev B, every changed region highlighted at pixel level.

Frequently asked

Text additions, deletions, and modifications are highlighted. Layout and image changes are also shown.

Yes — pick AEC / Blueprint mode. It runs a word-level text pass (dimensions, callouts, title-block revisions) alongside a masked pixel pass for geometry, so a relocated detail reads as "moved" and an in-place dimension change (Ø8 → Ø10) reads as one "modified" entry rather than a delete plus an insert. Each change is tagged with its sheet region and X/Y position.

Yes. The output PDF inherits bookmarks and form fields from the chosen base document; the diff overlay is added as annotations.

PDF 1.0 through 2.0 are diffed page-for-page. Encrypted files need to be unlocked first.

Ready when you are.

No sign-up · Runs in your browser · Files aren't uploaded.