NullID public guide
Hash and verify files locally
Hash & Verify computes file or text digests in the browser and compares them with expected checksums. It is useful for download checks, artifact review, and local integrity manifests.
Algorithms and outputs
NullID implements SHA-256, SHA-512, and SHA-1 for legacy interoperability. Outputs can be shown as hex, base64, or a SHA-256 sum-style line when SHA-256 is selected.
How to use it
- Paste text or choose a local file.
- Select SHA-256, SHA-512, or SHA-1.
- Compare against an expected digest or compare two files.
- Export an integrity manifest or batch hash report when needed.
Privacy notes
Digest calculation happens locally. The digest itself may still reveal that two parties have the same input, so treat exported manifests as integrity data rather than secret data.
Limitations
- SHA-1 is collision-weakened and should only be used for legacy checks.
- Browser memory and the configured file limit constrain very large files.
- A matching checksum detects identical bytes; it does not prove who created the file.