Document Hash
Generate the SHA-256 hash of any document to verify it has not been altered — computed locally in your browser with no file upload at any point.
Files are processed locally in your browser — no upload is required for this tool.
Frequently asked questions
What is a document hash used for?
A SHA-256 hash is a unique fingerprint of a file's contents. If the file changes — even one byte — the hash changes. You can compare hashes to confirm a document has not been tampered with or corrupted in transit.
How do I verify a document using its hash?
Compute the hash before sending the document and share the hash value separately. The recipient computes the hash on their end; if the values match, the document is intact.
Does the file need to be uploaded to compute the hash?
No. The SHA-256 computation runs entirely in your browser using the Web Crypto API. The file never leaves your device.
What file types can be hashed?
Any file — PDF, image, Word document, or other — can be hashed. The tool operates on the raw bytes regardless of format.
Is it safe? Are my files uploaded?
These tools run locally in your browser — for supported local operations your files are not uploaded to a server. Processing the document on your own device avoids sending it to a third party.
Privacy-focused document tools, local-first from the start.