What is a SHA-1 hash generator?
A SHA-1 hash generator converts text into a 160-bit digest, usually written as 40 hexadecimal characters. Enter text and this tool calculates the matching SHA-1 hash locally in your browser.
SHA-1 is now mainly useful when a legacy system, checksum, test fixture, or older identifier explicitly requires it. For new security-sensitive work, use a modern algorithm such as SHA-256 instead.
How to generate a SHA-1 hash
- Type or paste text into Input, or select Example to load
abc. - Choose lowercase or UPPERCASE from Letter case.
- Copy the generated hash from the output panel.
The result updates as you edit. The tool encodes the input as UTF-8 exactly as entered, so spaces, Tabs, and line endings all affect the result. Changing the letter case changes only the Hex display, not the digest bytes.
SHA-1 hash example
The UTF-8 text abc produces:
a9993e364706816aba3e25717850c26c9cd0d89dThat is 160 bits, or 20 bytes, displayed as 40 Hex characters.
Is SHA-1 still secure?
SHA-1 no longer provides adequate collision resistance for modern security applications. Do not use a plain SHA-1 digest for passwords, certificates, digital signatures, or any new design that depends on collision resistance.
NIST’s hash function policy has deprecated SHA-1 for generating digital signatures and other collision-sensitive uses. Choose SHA-256 or another approved modern algorithm unless compatibility requirements force SHA-1.
Why is SHA-1 still used?
Older protocols, file manifests, APIs, and repositories may store SHA-1 values as established identifiers. In those cases, reproducing the required digest can help with compatibility and debugging; it does not restore SHA-1’s security.
Git is a familiar example: existing repositories have historically used SHA-1 object identifiers, while Git documents a transition toward SHA-256. Match the algorithm required by the repository or system you are testing.
SHA-1 vs SHA-256
| SHA-1 | SHA-256 | |
|---|---|---|
| Digest size | 160 bits | 256 bits |
| Hex length | 40 characters | 64 characters |
| Best fit today | Legacy compatibility | Modern general-purpose integrity checks |
The two algorithms produce unrelated results. You cannot convert a SHA-1 digest into SHA-256 without hashing the original input again.
SHA1 Hash Generator FAQ
Can a SHA-1 hash be decrypted?
No. SHA-1 is a one-way hash function, not encryption. You can hash a candidate input and compare the result, but you cannot decrypt the digest back into its source text.
Is SHA-1 suitable for password storage?
No. Plain SHA-1 is fast and unsalted, which makes password guessing cheap. Use a dedicated password hashing function such as Argon2, bcrypt, scrypt, or PBKDF2.
Why do two SHA-1 generators produce different results?
They may be hashing different bytes. Check for spaces, line endings, letter case in the input, and text encoding. This tool preserves the exact input and encodes it as UTF-8.