See exactly what changed between two versions. Word-level redline — files never leave your browser.
or browse files · up to 50MB
🔒 Files are processed locally — nothing is uploaded
Processing...
Everything you need to fix, edit, and manage your PDFs.
Combine multiple PDF files into one.
Extract specific pages from any PDF.
Fix sideways or upside-down pages.
Remove unwanted pages from any PDF.
Change the page order of any PDF.
Convert PDF pages to PNG images.
Convert images into a PDF document.
Add page numbers to every page.
Stamp text across every page.
Pull all images out of a PDF.
Compare two PDFs side by side.
Reduce your PDF file size.
Add password protection.
Remove password protection.
Convert PDF to editable Word doc.
Convert Word docs to PDF.
Add your signature to any PDF.
Need to see exactly what changed between two versions of a document? Our redline comparison tool highlights every addition and deletion between two PDFs, just like Track Changes in Microsoft Word. Perfect for reviewing contract revisions, policy updates, and document edits.
Upload the original PDF first, then the revised version. Our tool extracts the text from both, compares them word-by-word using a longest common subsequence algorithm, and generates a redlined version showing additions in green and deletions in red with strikethrough.
Most online PDF tools — including iLovePDF, SmallPDF, and Adobe Acrobat online — upload your files to their servers for processing. That means your contracts, tax documents, medical records, and confidential business files pass through a third party's infrastructure. FixMyPDF.ai is different: every tool runs entirely in your web browser using client-side JavaScript. Your files are never uploaded, never stored on a server, and never accessible to anyone but you. There is no backend server processing your documents — it all happens on your device.
Does it compare formatting or just text? Currently the tool compares text content only. Formatting changes like font or spacing are not highlighted.
Will it work on scanned documents? Only if the PDF contains extractable text. Scanned images without OCR won't produce meaningful comparisons.