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Calculate SHA-256, SHA-1, SHA-384, and SHA-512 digests locally using the Web Crypto API.
Files are processed entirely in your browser. Nothing is uploaded.
Choose any file from your device.
Inspect SHA-256, SHA-384, SHA-512, and SHA-1 hashes generated via Web Crypto API.
Paste an expected checksum to compare bit-for-bit authenticity.
All PDF processing is executed locally in your browser memory via WebAssembly and Web Workers. Your files are never uploaded to any remote server.
A cryptographic checksum is a unique mathematical fingerprint of a file. Any alteration to the file changes the hash completely, proving tamper detection.
Inspect, modify, or strip PDF metadata fields (Author, Title, Creator) 100% inside your browser. Protect privacy before sharing.
Encrypt PDF documents with AES-256. Set user and owner passwords and restrict printing or copying, with zero uploads.
Compare two PDF versions side-by-side with word-by-word text diffing and visual pixel overlay heatmaps. 100% private in-browser comparison.
Rebuild corrupted xref tables, restore missing EOF trailers, and salvage readable pages from damaged PDF documents locally.