A cryptographic hash function producing a 160-bit digest.

Is SHA-1 secure for passwords?

No, do not use it for password storage.

Does the output change if one character changes?

Yes, the digest changes substantially.

This tool is intended for text input unless file mode is provided.

Why use SHA-1 at all?

Mainly for legacy compatibility and non-security checksums.

SHA-1 Generator

Compute a SHA-1 checksum of any text.

Reading time:: 2 min
Last updated:: 5 August 2026
Price:: Free, no signup

Your text

Results (live)

Type or paste text to see the result.

What the SHA-1 Generator does

Calculate the SHA-1 digest of text for compatibility checks and non-security identifiers.

Compute the SHA-1 digest of any text for checksums and legacy identifier work.

Why the SHA-1 Generator is useful

Some legacy systems use SHA-1 for checksums or identifiers, even though it is no longer suitable for security-sensitive hashing.

Some older systems still key records or verify downloads by SHA-1, and knowing the digest settles compatibility questions without installing anything.

Also known as: sha1 generator, sha1 hash, free sha-1 generator, online sha-1 generator, sha-1 generator online free, sha-1 generator tool, best sha-1 generator tool.

How to use the SHA-1 Generator

1
Paste the text
Paste the text and read the 40-character digest that appears immediately.
2
Adjust and process
Enter text, generate the digest, and copy the result for the intended compatibility task.
3
Compare digests
Compare the digest with the value your other system reports, then copy it for your records.

Key features

Produces a 160-bit SHA-1 digest
Supports text input
Calculates locally in the browser

Benefits

Legacy verification steps keep working without extra installs.
Identical input always yields the identical digest, which makes it handy as a stable identifier.

Real-life use cases

Identical checks

Confirm two copies of a file's source text are byte-identical.

Legacy integrations

Generate the digest an old integration expects for record keys.

Tips for the best results

Do not use SHA-1 for passwords, signatures, or security-sensitive integrity decisions; prefer modern secure alternatives.
SHA-1 is broken for security purposes; use it for compatibility only, never for signing or hashing passwords.

Conclusion

A single changed character alters the entire digest, which is precisely what makes it useful as a fingerprint.

Frequently asked questions

What is SHA-1?: A cryptographic hash function producing a 160-bit digest.
Is SHA-1 secure for passwords?: No, do not use it for password storage.
Does the output change if one character changes?: Yes, the digest changes substantially.
Can it hash files?: This tool is intended for text input unless file mode is provided.
Is my input uploaded?: No.
Why use SHA-1 at all?: Mainly for legacy compatibility and non-security checksums.

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Browse the full tools directory, filter by category, or read guides on the Text Tools Hub blog.