Compare PDFs

About compare two PDFs

Compare two PDF files page-by-page and generate a visual diff report highlighting every pixel and text change in red. Verify that a counterparty did not slip unapproved edits into a contract before signing, or check design proof revisions across pages.

If a paragraph insertion pushes all subsequent text down the page, everything below the insertion will highlight as visually shifted on that page.

How PDFolio helps you compare two PDFs

PDFolio renders matching pages from both PDFs onto offscreen canvases, compares RGB pixel values at every coordinate, highlights changed pixels in crimson, and pairs that with a text-layer comparison.

If you only want to inspect hidden metadata differences in a single file, use Privacy Scanner.

Before you download

Even subtle font shifts, signature marks, or a single changed digit in a table will light up clearly in the red diff panel.

When the result is ready, download it immediately and open it in your usual PDF viewer to make a final check. You can then use Clear task data to release temporary file references from this browser tab. PDFolio does not create an account, cloud folder, or server-side document history.

A private way to compare two PDFs

PDFolio handles the selected files in the active browser tab. A Web Worker on your device performs the PDF task so the interface can remain responsive; document bytes are not sent to a PDF processing server, upload queue, account database, or advertising platform.