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Compare PDFs

Compare two PDF revisions side-by-side with text diffing and canvas visual pixel difference overlay.

Processed entirely in browser

Document A (Original)Drag & drop or click to upload first PDF

Document B (Revised)Drag & drop or click to upload second PDF

Upload two versions of any contract, agreement, or report to compare changes.

How to Compare Two PDF Documents Online

Select Original Document (Version A) and Modified Document (Version B).

Review added, removed, and modified words highlighted with color coding.

Toggle the pixel difference heatmap to detect shifted graphics or formatting.

Comparing 100+ page documents visually may require several seconds of canvas rasterization

All PDF processing is executed locally in your browser memory via WebAssembly and Web Workers. Your files are never uploaded to any remote server.

Yes! FileMelo includes both a text diff viewer and a visual pixel heatmap that highlights modified graphic elements.

Rebuild corrupted xref tables, restore missing EOF trailers, and salvage readable pages from damaged PDF documents locally.

Inspect, modify, or strip PDF metadata fields (Author, Title, Creator) 100% inside your browser. Protect privacy before sharing.

Calculate SHA-256, SHA-512, and SHA-1 cryptographic hashes of your PDF in real time. Verify document integrity locally with zero uploads.

Annotate PDFs in your browser with text notes, rectangles, circles, and freehand pencil markings. Features undo/redo and zero uploads.

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