Home / Privacy Tools / SHA-256 File Checksum
EXPERIMENT 02 / PRIVACY FIRST
SHA-256 File Checksum.
Calculate a SHA-256 fingerprint of a file locally using Web Crypto.
Drop a file here, or choose oneProcessed in your browser. This service does not upload file contents.
Select a file to begin.
What this tool does
Verify file integrity without uploading the file.
Practical example
Example: compare the hash of a downloaded installer with the checksum published by its vendor.
Known limitations
Checksum matches detect changes but authenticity relies on a trusted source.
Privacy and limitations
Your file is processed in this browser tab. Do not assume that deleting metadata removes visible watermarks, server-side copies, or all possible identifying information. Image conversions re-encode pixels and may change visual quality. Inspect your downloaded output before sharing. If any extension or conversion format is unsupported, the tool reports it instead of silently uploading your file.