PDF Compare — side-by-side document comparison

Compare two revisions of a PDF, side by side.
Drop the older and newer documents above, then hit Compare. Pages are paired side by side with synchronised scrolling — where one document has extra content the other side waits, so matching sections stay level. Hover over text to outline the matching sentence or table cell on the other side; hovering a highlighted change outlines the corresponding changed text instead. Use n/p to jump between changes, h to toggle highlights, and Ctrl+scroll (or +/−) to zoom.

Deleted from older Added in newer

Load a PDF above, then click the page where each section starts — it gets a halo and a name. Ctrl/Shift+click selects pages and ⟳ rotates them; “Aa” on a section page names it from the page's own text. Number filenames by preceding page

Add PDFs above — the merged document follows the page order shown here.

Images → PDF Drop images in the left box above — each becomes one PDF page, in the order shown below.

Page size

PDF → images Drop a PDF in the right box above to export its pages as images.

Format Detail Pages

Scan → searchable Drop a scanned PDF in the right box above — OCR reads each page and writes an invisible text layer underneath, so the document becomes searchable, selectable and comparable. Pages are never re-rendered: the output looks identical to the input.

Detail Only pages without text Pages

Load a PDF above, then click pages to select them — Ctrl/Shift+click for several, ⟳ rotates. Extract downloads just the selected pages; Delete downloads the document without them.

Page numbers Style Position Start at Pages

Bates numbers Prefix Digits Start at Position

Watermark Text Colour Strength Layout

Page numbers print small and neat in the margin — pick the corner, the style and where counting starts. Bates numbers print a unique padded identifier on every page (e.g. ABC-000041), the standard for legal and contract document sets. Watermark prints a large label — DRAFT, SUPERSEDED, FOR INFORMATION — across every page. Tick any combination, then Stamp & download. The original file is untouched; stamps are drawn into a copy, and text underneath stays selectable and searchable.

Load a PDF above, pick a method, then Compress.

Method

Smaller images re-compresses the photos and figures embedded in the file — oversized ones are downscaled and everything is re-encoded as quality JPEG — while the pages themselves are never rasterised: text stays selectable, searchable and comparable. This is usually where huge report files shrink the most.

Lossless clean-up rewrites the file with compressed object streams and drops unused objects and stale incremental-save data. Text stays selectable and nothing is re-encoded, so savings are modest unless the file carries dead weight.

The JPEG presets re-render every page as a photo at the chosen detail — this is where huge files (scans, image-heavy reports) shrink dramatically. The trade-off: text in the output is a picture, so it can't be selected or searched, and such pages can't be text-compared later. 200 dpi still prints crisply; 110 dpi is for email-sized copies. If the result wouldn't be smaller than the original, nothing is downloaded.

Section divides