Hash text or a local file with your browser's built-in WebCrypto — SHA-256 by default. Get hex and Base64, and paste an expected digest to verify a checksum. The file is read locally.
Privacy ledger
Data acquired
None.
Libraries used
Lit 3 — bundled into the tool file itself.
Data stored
None.
Data transmitted
None.
Use it on your own page
Download the tool as a single self-contained HTML file: readable source with the Lit library included, zero network requests — it works opened straight from your disk, and you can customize everything.