Batch Hash Check
Checksum a batch of files, compare them against an existing manifest, and download the results.
Hashing & encryption Client-side WebCrypto + manifest comparison
Tool preview
How to use it
- 01
Drop several files.
- 02
Optionally paste or drop a SHA256SUMS file to verify against.
- 03
Compute SHA-256, then read the match / changed / not-listed badges.
Limitations
- ! Files are processed one by one in the tab, so large batches take time.
- ! Comparison is by filename, so renamed files show as not listed.
- ! Only SHA-256 is produced; other algorithms are available in the single-file hash tool.
FAQ
What format is the manifest?
The standard sha256sum format: hash, two spaces, filename. The binary-mode asterisk is accepted too.
What does “changed” mean?
The file is listed in the manifest but its hash differs — the bytes changed since the manifest was created.
Are files uploaded?
No.
Files never leave your device
Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.
Technical details
- Processing
- Client-side
- Implementation
- WebCrypto + manifest comparison
- Category
- Hashing & encryption
- Network requests
- None while processing