Compare two PDF files, highlight text differences, check the page count and compare document metadata, all in one free online tool. Everything runs in your browser, so your documents stay private.
🔒 Private by design: both PDFs are read inside your browser and are never uploaded to any server. Text comparison works on PDFs with selectable text, so scanned image PDFs need OCR first.
Choose a view. The tool above switches instantly, and the results of your comparison stay in place.
Two PDFs can look almost the same and still hide important changes: a reworded clause in a contract, a new figure in a report, a missing page in a final export. Finding those changes by flipping between two windows is slow and easy to get wrong.
This free PDF compare tool reads both files in your browser, lines up their text and shows exactly what was added, removed or changed. It also checks the page count and the document properties, so you get a complete picture in seconds. There is no sign-up, no watermark and no upload.
Add an original file and a revised file, then click Compare PDFs. The overview tells you in one glance whether the two documents match, how similar their text is, how many pages differ and which document properties changed. From there you can jump straight to the detailed views.
The text view shows every line that exists in only one file. Text removed from the original is shown in red and new text in green. When a line was edited, only the changed words are highlighted, so a single replaced number or name stands out immediately. Unchanged text is folded away so you can focus on what matters.
See how many pages each PDF has and how large the gap is. A page by page table lists the size of every page (such as A4 portrait or US Letter landscape), the number of words, and whether that page is identical, has different text, has a different size, or exists in only one file.
Check the hidden properties stored inside each PDF: title, author, subject, keywords, creator application, PDF producer, creation date, modification date and PDF version, together with file size and page count. Differences are marked so you can tell whether a file was re-exported, edited in another program or produced by a different tool.
Most online comparison services require you to upload both documents, which is risky for contracts, financial statements and personal records. This tool runs entirely inside your browser, so your files never leave your device. It is quick, it is free, and it gives you a clear report instead of a wall of raw data.
Yes. It is 100% free, with no registration, no watermark and no limit on how many files you compare.
No. Both PDFs are read and compared inside your browser, so your documents stay on your device. Only the open source helper library is loaded from a public CDN.
It compares the extracted text line by line and word by word, the page count, the size and word count of every page, and the document metadata such as title, author, producer and dates.
No. It focuses on text, page structure and properties. If two files contain the same text but a picture or color was changed, the text comparison will report no differences.
A scanned PDF stores each page as a picture without selectable text, so there is nothing to compare. Run OCR to turn the scan into searchable text, then compare again.
Red lines exist only in File A, the original. Green lines exist only in File B, the revised file. Inside an edited line, the highlighted words show exactly what changed.
If a paragraph was reflowed or re-wrapped, the line breaks move and the lines no longer match exactly even though the wording is the same. Compare the highlighted words to see the real changes.
Saving or exporting a PDF again updates the modification date and often the producer. Different dates or producers are normal and do not mean that the content changed.
Not directly. The tool cannot open encrypted files, so remove the password with the original software first and then add the file again.
Yes, it works in modern mobile browsers. For long documents a computer is faster and gives a more comfortable view of the differences.
Merge, split, compress, edit and secure your PDF files with our other free tools.