Compare two PDFs page by page
Choose two PDFs and the page numbers to compare. Pages are paired by number; adjust the threshold to highlight differences between their rendered pixels.
Runs locally in your browser · visual diff · up to 20 pages
Choose two PDFs and the page numbers to compare. Pages are paired by number; adjust the threshold to highlight differences between their rendered pixels.
Runs locally in your browserCompare PDF Files Visually belongs to the PDF tools on KivTools. The workbench above handles the whole job on one screen: files chosen from your device, then a file you download.
The conversion runs inside the page with browser JavaScript. Nothing you enter is uploaded, the tool keeps working offline, and it is safe for data you are not allowed to send to a third party.
Binary formats carry more than the content you see: metadata, colour profiles, embedded fonts and, in practice, a fair amount of information you did not intend to publish. These tools transform or inspect a file while keeping the payload intact.
Two traps dominate: quality lost through repeated re-encoding, and metadata left in place after an edit. Compress once from the original, and inspect what the file still declares about you before sharing it.
Browsers, desktop tools and command-line utilities should agree on the result; a mismatch usually means a different encoding, locale or version. Open the result in a viewer you trust and check size, dimensions and, where it matters, the metadata panel rather than the file name.
Some formats are containers for other formats, so the extension alone does not tell you what is inside; when a system rejects a file, look at the actual header bytes before renaming it. Keep a copy of the input while you experiment, so a wrong setting never destroys the source.
Input: two PDF files; output: page-by-page visual diff with pixel measurements, red change maps, and a ZIP of PNG comparison images for selected pages (up to 20 pages).
Reviewing contract revisions, comparing document versions before publishing, and verifying rendering changes in generated PDFs.
The two PDF files are processed in browser JavaScript and are not uploaded to KivTools.
Only pixel-level visual differences are detected; text or metadata changes that do not alter the rendered appearance are not reported, and comparisons are limited to 20 pages.
Yes. Every tool on KivTools is free, needs no account and has no usage quota. There is no paid tier hiding behind the workbench, and no email address is required to use the result.
Inside your browser. The page loads a script once and the conversion happens on your machine, which is also why the tool still works when the network drops.
Input: two PDF files; output: page-by-page visual diff with pixel measurements, red change maps, and a ZIP of PNG comparison images for selected pages (up to 20 pages). Large inputs are usually handled without trouble, but extremely large ones are better processed in a local command-line tool.
PDF is a container: fonts, images and metadata travel with the pages you see. Compare a small known-good sample first when the output feeds an automated pipeline.
The output is yours: no watermark, no licence tag, no attribution requirement. Check the underlying format or library licence when the result ships in a product.
The page works in any modern mobile browser, and the layout collapses to a single column on small screens. Local tools keep working offline once the page has loaded.