SHA-1 Hash Online
SHA-1 is a 160-bit one-way digest. This page hashes with Web Crypto and will brute-force only a tiny search space. It will not decrypt a SHA-1, and you should not use SHA-1 for new security work.
Private by design. SHA-1 runs in this tab via Web Crypto — the input never leaves your device.
FreeNo sign-upRuns in your browserDeveloperApplication
How to hash with SHA-1
- Type the input. The 40-character hex updates as you type. Compare it against another hex if you have one.
- Invert only short strings. The second tab is a local brute-force, max length 4, plus a small dictionary.
Frequently Asked Questions
- Can SHA-1 be decrypted?
- No. Same rule as every cryptographic hash: you guess inputs, you do not reverse the function.
- Is SHA-1 broken?
- Collision attacks are practical. Do not use it for signatures or password storage. Fine for a legacy checksum.
- Is text uploaded?
- No. Web Crypto runs in this tab.
Use Cases
- Reproduce a published SHA-1 of a short string
- Compare two SHA-1 hex values
- Classroom demo of one-way hashing
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