SHA1 Hash Generator
Generate SHA1 hashes online for legacy compatibility checks.
What Is SHA-1?
SHA-1 is a 160-bit hash algorithm from the SHA family with known collision attacks. It is still present in legacy environments but is deprecated for modern cryptographic security.
Specifications
Output Size 160 bits
Standard FIPS 180-1
Standard Year 1995
Use Cases
- Legacy interoperability
- Historical checksum comparison
!
Security Notice
Avoid SHA-1 for new security-sensitive designs.
Related Tools
Utilities
Implementation Notes
Practical usage details for this browser-based SHA-1 tool.
How to Generate a SHA-1 hash
- Choose UTF-8, Hex, Base64, or File input mode.
- Enter text, encoded bytes, or choose a local file to process.
- Click Generate SHA-1 Hash and copy the result.
Example Input and Output
Sample input:
abc
Sample output:
a9993e364706816aba3e25717850c26c9cd0d89d
When Not to Use SHA-1
- Do not use it for certificate signing.
- Do not use it for password storage.
- Do not use it for authentication or proving who created a message.
- Do not use it for digital signatures.
Recommended Alternatives
Recommended migration target: SHA-256. SHA1 has known collision attacks and is deprecated.
SHA-1 Test Vectors
Input: empty string
da39a3ee5e6b4b0d3255bfef95601890afd80709
Input: abc
a9993e364706816aba3e25717850c26c9cd0d89d
Command Line Alternatives
sha1sum file.zip
shasum -a 1 file.zip
certutil -hashfile file.zip SHA1
openssl dgst -sha1 file.zip
File Verification Scenario
SHA-1 appears in older checksum lists and legacy identifiers. Treat it as compatibility data, not modern security evidence.
Security Guidance
SHA-1 has practical collision attacks and should not be used for new security-sensitive designs.