Local file tool

Calculate a file checksum

Select a file and hash it inside this browser. The file is never uploaded.

File checksum

WebCrypto processes the selected file locally.

Runs locally

Checksum

The browser API requires the file to fit in available browser memory. No network request contains its name or contents.

JavaScript is required for this local tool

The rest of unHash remains server-rendered. This page uses browser cryptography specifically so files, keys, and messages do not need to be sent to the server.

Privacy boundary

This tool has no upload endpoint. Analytics, when configured, receives only allowlisted action names such as completion or verification—not filenames, digest values, keys, messages, file contents, or expected checksums.