Create SHA1 hashes instantly from any text. While SHA1 is deprecated for security, it's still widely used in Git for commit hashes and legacy systems. Useful for Git development, file verification, and compatibility testing. All processing happens in your browser.
Just a few steps:
SHA1 (Secure Hash Algorithm 1) was designed in the 1990s and became incredibly popular - you've probably seen it without realizing. Git uses SHA1 for commit hashes (those long strings you see in git log). However, security researchers found vulnerabilities that make SHA1 unsuitable for new security applications. While it's being phased out for security purposes, it's still everywhere in legacy systems and Git repositories.
SHA1 takes any input and produces a 40-character hexadecimal string (160 bits). It's like a fingerprint for your data - the same input always gives the same hash, but change anything and you get a completely different result.
Not for security purposes. SHA1 has known vulnerabilities and can be exploited. If you're working on something security-related, use SHA-256 or SHA-3 instead. SHA1 is fine for non-security uses like Git commit hashes or legacy system compatibility, but keep it away from anything that needs real protection.
Git uses SHA1 for identification, not security. The hash is just a unique identifier for commits and objects - it's not meant to prevent tampering. Git is actually working on migrating to SHA-256, but the transition is complex because of how deeply SHA1 is embedded in Git's architecture.
SHA1 always produces exactly 40 hexadecimal characters, which represents 160 bits (20 bytes). No matter what you hash, you'll always get those 40 characters.