Compare PDF
See what text or visual layout changed between two PDF versions.
Processed entirely in your browser. Your file is never uploaded to a server.
- Text diff: line-by-line highlight of text added and removed between two versions.
- Visual diff: renders each page and highlights exactly what changed pixel-by-pixel — catches layout shifts, resized or replaced images, and formatting changes that don't touch the wording at all.
- Faster than reading both documents to find what changed.
- Runs in your browser — neither file is uploaded.
Why this is private
- Processed entirely in your browser. Your file is never uploaded to a server.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Compares two PDFs two ways: "Text diff" extracts and line-diffs the text layer (what was added/removed in wording), and "Visual diff" renders each page of both PDFs and highlights pixel-level differences — catching a moved element, a replaced figure, a reformatted table or a changed page size that identical wording would hide from a text-only diff.
How to use it
- 1Upload the original PDF and the revised PDF.
- 2Pick "Text diff" or "Visual diff".
- 3Review the added/removed lines, or the per-page diff images with a highlighted-red overlay of what changed.
Tips
- Scanned PDFs with no text layer won't produce a useful Text diff comparison — run them through OCR PDF first to add a text layer, then compare here. Visual diff works on scans directly, since it compares rendered pixels rather than a text layer.
Frequently asked questions
What people use it for
Review contract or policy revisionsSee exactly which clauses changed between two drafts with Text diff.
Catch a changed figure, logo or layoutUse Visual diff to spot a reformatted table or replaced image even when the surrounding wording is identical.
Check a re-issued documentConfirm a corrected invoice or report only changed what it should.
Verify a vendor's 'minor edit' claimDiff the text (or the visuals) to see the real extent of the change.
Related guides
- How to convert images to PDF (JPG, PNG, phone photos)Turn one or several JPG or PNG images into a single PDF, in the right page order — what the tool does, the steps, and the common snags.
- How to merge PDF files into oneCombine two or more PDFs into a single file, in the order you choose — the steps, what merging does to quality and size, and how to handle pages and images.
- How to compress a PDF to under 1 MBA 1 MB upload limit is common on application portals. Here's what's realistic, how to get there, and when 1 MB simply isn't possible without losing the text.
- How to compress a PDF for email attachmentsGmail, Outlook and most providers cap attachments around 20–25 MB. Here's how to get a PDF under the limit — or send it without shrinking it at all.
Related tools
All pdf toolsPDF to TextExtract selectable text from a PDF, with reading-order-aware, column-aware extraction.OCR PDFAdd a searchable text layer to a scanned PDF, in your browser — Hindi included.PDF to MarkdownConvert a PDF's text, tables and links into clean Markdown.Organize PDFReorder, rotate and delete pages from a visual grid.
Ready to use Compare PDF?
Compare PDF