🔍 PDF Tools
Visual pixel diff, word-level text diff, and metadata comparison — with smart page alignment that correctly handles inserted, deleted, or reordered pages.
Pages are matched by content similarity rather than position, so inserted/deleted/reordered pages don't cascade into false "changed" results on every later page. Override a pairing manually if needed.
ToolAdda's compare PDF online tool lets you diff two PDF documents side by side without uploading them anywhere. Get a visual pixel diff with swipe and overlay modes, a word-level text diff, metadata comparison, and smart page alignment that correctly handles inserted, deleted, or reordered pages.
Yes. ToolAdda's PDF compare tool is completely free with no sign-up. Both files are processed in your browser — nothing is uploaded.
Visual comparison works on any PDF, including scans, since it compares rendered pixels. Text comparison only works on pages that have an extractable text layer — if a page has no text (a pure scan), the tool will tell you clearly and fall back to visual-only comparison for that page.
Yes. Instead of blindly comparing page 1 to page 1, the tool aligns pages by content similarity first, so an inserted, deleted, or reordered page is correctly flagged as such rather than making every following page look changed.
No — both PDFs are compared entirely inside your browser using PDF.js. Nothing is sent to a server.
Yes — you can export the text diff as a .txt or .html file, copy a plain-text summary to your clipboard, or download the changed pages as images.