Calculate SHA-256, SHA-384 or SHA-512 from exact file bytes, then compare an expected digest with visible file-selection status.
The selected file is read only by a local worker. Filename, byte size and loading/ready/error state remain visible. File bytes are released after hashing, and comparison never contacts a server.
A hash checks exact bytes against an expected digest; it does not prove that a file or its source is safe. No MD5/SHA-1 security option is offered. File replacement, clear or algorithm changes cancel obsolete local workers.
No. Processing uses local browser JavaScript and workers. Inputs are not stored, logged, placed in URLs or sent to external services. Clipboard or downloads occur only when you choose.
Input and result references are released and any active worker is terminated. JavaScript cannot guarantee physical memory erasure or remove screenshots, copied clipboard data or downloads. Clear those separately if needed.
No tool can guarantee security of a device, a password or a file. Strength is a local model estimate; file hashing verifies bytes against a supplied digest. Encryption protects compatible text under its stated format and passphrase assumptions.
