Compare PDF
Compares the text of two PDFs line by line and reports exactly what was added or removed.
- No upload — runs on your device
- Free, no sign-up
- No watermark
What Compare PDF does
Compares the text of two PDFs line by line and reports exactly what was added or removed. Spotting exactly what changed between two versions of a document by eye is slow and error-prone, especially for longer files. This tool compares the text of two PDFs line by line and reports precisely what was added or removed, even when the two files have different total page counts.
Works well with: Merge PDF · PDF to Text · Organize PDF
Runs 100% in your browser
PDFHook processes this file using JavaScript on your own device. It's never uploaded, stored, or seen by anyone else — and it works even if your connection drops mid-way.
Compare PDF in 3 steps
Upload both PDFs
Choose the original and the revised version.
Comparison runs automatically
Text from both files is compared line by line.
Download the report
See exactly what was added or removed.
Key features
- Line-by-line text comparison
- Clear added/removed report
- Works across different page counts
- Handles PDFs with different total page counts gracefully
- Clear, structured added/removed report rather than a raw diff dump
Practical use cases
- A legal team needs to identify exactly what changed between two contract drafts.
- An editor reviewing a revised document wants a clear summary of textual changes.
- Someone reviewing a policy update wants to see precisely which sections were modified.
Related terminology
- Line-by-line comparison
- A comparison method that checks each line of text between two documents, reporting specific additions and removals rather than a general similarity score.
Frequently asked questions
Does this compare formatting and images too?
No — the comparison is text-only, line by line. Visual or formatting-only differences aren't detected.
What if the two PDFs have different page counts?
The comparison still runs — the report will note the page count difference alongside the line-by-line changes.
Does this detect moved or reordered paragraphs?
The comparison is line-by-line based on position and content — significant reordering of content may show as removed-and-re-added rather than a detected "move."
Can I compare more than two PDFs at once?
The tool compares exactly two PDFs at a time — for multiple versions, compare them in sequential pairs.
Is there a free PDF diff checker for comparing two versions?
Yes — this PDF diff checker compares two documents line by line for free, reporting exactly what text was added or removed between them.
Can I compare two PDF documents to find what changed?
Yes — this lets you compare two PDF documents and find differences between PDFs; it works well to compare PDF versions of the same document as a straightforward PDF comparison tool.
Is Compare PDF free?
Yes, and there is no sign-up, watermark or daily limit — everything runs in your browser rather than on a metered server.
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