PDF Diff
Compare the text of two PDF versions and see every added or removed line.
About this tool
Add version A and version B, click Compare, and the tool extracts the text from both on your device and shows a line-by-line diff: green for lines added in B, red for lines removed from A, with unchanged context around each change and a summary count.
What a PDF diff can tell you
The common case is a contract that came back 'with a few changes' — the diff finds all of them, including the one in clause 14.3 that nobody mentioned. The tool compares text, the way a code diff does, so it is exact about words and blind to everything else: a re-flowed paragraph appears as one removed and one added line (read them side by side), moved sections show as removed here and added there, tables come out as lines of cells, and a changed image or layout is invisible. Scanned PDFs contain no text, so run the PDF OCR tool on both first. Both files are processed in your browser and never uploaded, which is the point for documents you are not allowed to send to a website. For prose in two text boxes use the text diff; for data, the JSON diff; to pull the text out for other uses, the PDF text extractor.
Frequently asked questions
Does it show formatting or image changes?
No — it compares extracted text only. A changed font, layout, signature image or stamp will not appear.
Why does one small edit show as two whole lines?
Lines are compared whole; a word changed in a sentence shows the old line removed and the new line added. Read the pair to spot the word.
Can it compare scanned PDFs?
Only after OCR — scans have no text layer. Run the PDF OCR tool on both, then compare the results.
Are the files uploaded?
No. Text extraction and comparison happen on your device with an open-source PDF engine included in the page.