Compare PDF
Spot exactly what changed between two PDF versions โ added text in green, removed text struck through โ without uploading a single file.
Original PDF
Drag & drop the original PDF, or click to choose.
Changed PDF
Drag & drop the changed PDF, or click to choose.
Both files stay on your device โ they are never uploaded. The comparison runs entirely in your browser.
Compare PDF finds the text differences between two versions of a PDF and highlights them inline: inserted words are shown in green, deleted words are struck through in red, and a summary tells you how many words were added and removed. The whole comparison runs locally in your browser using on-device text extraction and a word-level diff, so neither file is ever uploaded โ ideal for contracts, drafts, policies, and any document you would rather keep private. Drop in the original and the changed PDF, click Compare, and toggle between the full text or just the changes.
Frequently Asked Questions
How do I compare two PDF files for differences?
Upload the original PDF on the left and the changed PDF on the right, then click Compare PDFs. The tool extracts the text from both, computes a word-level difference, and shows added words highlighted in green and removed words struck through in red, with a count of each.
Are my PDFs uploaded to a server?
No. Compare PDF reads and compares both files entirely inside your browser using on-device processing. Nothing is sent anywhere, so your documents stay completely private โ unlike many comparison tools that upload your files.
Is this PDF compare tool really free?
Yes, it is free with no signup, no watermark, and no page limits. Premium comparison tools like Draftable charge for true word-level redlining; this tool gives you inline word-level differences with counts at no cost.
Can it compare scanned or image-only PDFs?
It compares selectable (real) text. If a PDF is a scan or image with no extractable text, there is nothing to diff โ run OCR (text recognition) on it first to turn the image into text, then compare the results.
Does it show added and removed words separately?
Yes. The summary reports how many words were added and how many were removed, and the inline view marks insertions in green and deletions with a red strikethrough so you can see exactly what changed at a glance.
What happens if the two PDFs are identical?
If the extracted text of both files is the same, the tool tells you that no text differences were found. It also lets you know when only spacing or line breaks differ rather than actual words.
Can it handle very large PDFs?
Yes. For normal documents it uses a precise word-level comparison. For very large documents it automatically switches to a faster line-level comparison so your browser stays responsive, and it tells you when it does.
Does comparing work offline?
Once the page has loaded, the comparison itself runs on your device, so it works without sending your files over the network. Your PDFs never leave your computer.