Text mode
Extracts the text exposed by each page and compares that wording line by line.
Compare PDF files online for free — text and visual differences.
Choose the question you need answered. Text mode reviews extractable wording; Visual mode reviews rendered page appearance. Files stay private in your browser.
Free to useRuns locally in your browserFiles are not uploaded or storedNo sign-upPreparing required files for offline use…
Add two PDFs to begin.Your files stay in this browser tab and are released when you clear or close the page.
How Diff Master compares PDF files
Diff Master answers two different PDF questions: Text differences compares extractable wording, while Visual differences compares rendered page appearance.
- Choose Text differences for wording or Visual differences for layout, font and image changes.
- Select the original and changed PDF. Each file can be up to 50 MB and 150 pages.
- Run the local comparison, then review every changed, added or removed page.
Visual mode
Renders corresponding pages in this browser and compares their pixels.
Page alignment
Matches pages by page number; a page present on only one side is added or removed.
Original page text
Total due: $125.00
Changed page text
Total due: $145.00
Expected result: Text mode marks the amount as modified. Visual mode also reveals any movement, font or image change on the rendered page.
PDF comparison FAQs
Practical answers about how this tool compares content, what stays local and where its current limits are.
How does PDF comparison work?
Text differences extracts wording that each PDF exposes and compares it line by line. Visual differences renders matching pages in your browser and compares their pixels to reveal layout, font, image and rendering changes.
Are my PDF files uploaded or stored?
No. Diff Master reads, renders and compares the selected PDFs in this browser tab. The files, extracted text, rendered pages and results are not uploaded to or stored by Diff Master.
Can I compare PDFs with different page counts?
Yes. Pages are aligned by page number. A page that exists on only one side is reported as added or removed, and you can move through every changed page from the result toolbar.
What happens with scanned PDFs?
A scanned page may not expose text, so Text differences can report that page as unavailable. Use Visual differences to compare the rendered page appearance instead.
What PDF limits should I know about?
Each selected PDF can be up to 50 MB and 150 pages in the current version. Large or image-heavy documents can take longer and use more browser memory because processing stays on your device.