📄 File & Document Tools
Calculate SHA-256, SHA-384, or SHA-512 hashes for a local file without uploading it.
Generate a cryptographic checksum from a local file so you can compare it with a published hash or detect whether file bytes differ.
Calculate a cryptographic digest for a selected file in the browser and compare it with a published checksum. The file remains local; only the computed digest is displayed.
The selected file is processed in browser memory. Keep an original copy and inspect the downloaded result before using it as an authoritative or archival document.
Last reviewed for accuracy:
Scenario: A publisher lists a SHA-256 checksum and the user selects the downloaded file.
Result: An exact character-for-character match supports that the file bytes match the publisher's referenced copy.
The browser hashes every byte with SHA-256. Any byte change produces a different digest with overwhelming probability.
The tool reads bounded file bytes and passes them to the browser's cryptographic digest implementation. Hash comparison should normalize harmless letter case in hexadecimal but not omit or reorder characters.
These primary references document standards or definitions used in the explanation above.
No. A hash only shows that bytes match another copy or published digest; it does not independently establish that those bytes are trustworthy or malware-free.
No. The current calculator reads the file in your browser and does not intentionally transmit its bytes or filename to Fieldlet.