SHA-1 Hash Generator – Free Online SHA-1 Calculator
Generate SHA-1 hash online for free. Convert any text into a 160-bit SHA-1 hash (40 hex characters) instantly in your browser. Fast, accurate and private.
SHA-1 Hash Generator – Create SHA-1 Hashes Online
Our free SHA-1 Generator converts any text into its SHA-1 hash instantly. Type or paste your text and get a 160-bit hash shown as 40 hexadecimal characters — ideal for checksums, data verification and development work. No installation or sign-up is needed.
What is SHA-1?
SHA-1 is a cryptographic hash function: it takes input of any length and produces a fixed-length 160-bit output, written as 40 hexadecimal characters. The same input always gives the same hash, but changing even a single character produces a completely different result.
SHA-1 was published by the NSA and NIST in 1995 and was the standard for SSL certificates and software signing for many years. Git still uses SHA-1 to identify commits.
SHA-1 is deprecated for security since Google demonstrated a real collision in 2017. Browsers no longer accept SHA-1 certificates; prefer SHA-256 for new projects.
How to use the SHA-1 Generator
- Type or paste your text into the input box.
- Click the generate button to calculate the SHA-1 hash.
- Copy the result with one click.
- Compare it with another hash to confirm the data has not changed.
Key features
- Instant SHA-1 hashing of any text
- Standard 40-character hexadecimal output
- One-click copy of the result
- Free with no limits for normal use
Common use cases
- Verifying file or message integrity with checksums
- Generating unique keys and identifiers in software
- Testing and debugging applications that use SHA-1
- Working with legacy systems that still rely on SHA-1
- Learning how hash functions behave for study or teaching
Frequently asked questions
Can a SHA-1 hash be decrypted?
No. Hashing is one-way; there is no key to reverse it. Weak or common inputs can sometimes be guessed with lookup tables, which is why passwords need salting and slow algorithms.
Is SHA-1 safe for storing passwords?
No fast hash, including SHA-1, should be used alone for passwords. Use our Bcrypt Generator or another slow, salted algorithm instead.
Why is my SHA-1 hash different from another tool?
Hidden spaces, line breaks or a different character encoding change the input and therefore the hash. Make sure the text is exactly the same.
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