Hash a downloaded file
file = (select any file)
Result: Select a file to see its SHA-256 hash.
File SHA-256 Hash Generator
Compute the SHA-256 hash (digest) of a file without uploading it to any server. The file is read locally using the FileReader API and hashed with the Web Crypto API. Useful for verifying file integrity, checking downloads, and confirming file authenticity.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Is my file uploaded to a server?
No. The file is read entirely in your browser using the FileReader API and hashed with the Web Crypto API. Nothing is transmitted anywhere.
Why would I hash a file?
File hashes verify integrity - if the hash matches the one provided by the software vendor, you know the file hasn't been tampered with or corrupted during download.
What is the maximum file size?
The tool supports files up to 50 MB. For larger files, consider using a command-line tool like sha256sum (Linux/Mac) or Get-FileHash (Windows).
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