Common Use Cases
📦
Download Verification
Compare SHA-256 checksums against vendor-published hashes to confirm file integrity.
🔐
API Signature Testing
Generate digests when debugging HMAC, webhook signatures, and signed request payloads.
🗄️
Cache Keys & ETags
Create stable fingerprints for content caching, deduplication, and CDN invalidation.
🧪
Dev & QA Workflows
Quickly hash test strings, config values, or fixtures during local development.
Which Hash Algorithm Should You Use?
| Algorithm | Output | Best For |
|---|---|---|
| MD5 | 32 hex chars | Legacy checksums, cache keys, non-security dedup |
| SHA-1 | 40 hex chars | Git objects, legacy systems (avoid for security) |
| SHA-256 | 64 hex chars | File verification, APIs, blockchain, general use |
| SHA-384 | 96 hex chars | High-security contexts, compliance workloads |
| SHA-512 | 128 hex chars | Longer digests, passwordless tokens, strong integrity |
Best Practices
- Use SHA-256 or SHA-512 when verifying downloads or building security features.
- Never use MD5 or SHA-1 for password storage or digital signatures.
- Compare checksums case-insensitively — hex casing does not change the digest.
- For large files, hashing may take a few seconds; keep the tab open until complete.
- Publish SHA-256 checksums alongside software releases so users can verify integrity.