Free SHA-1 Generator

The SHA-1 Generator produces the 160-bit SHA-1 digest of any text instantly. While SHA-1 is retired for security use, it still appears everywhere: Git commit IDs, legacy checksums, and older protocols. Paste your text and get the standard 40-character hex digest live, with one-click copy for scripts and documentation.

SHA-1 is deprecated for security use (collision attacks are practical). Use SHA-256 for anything security-sensitive.
Private by design. This tool runs 100% in your browser — your text is hashed locally and never uploaded or stored anywhere.

How to Use the SHA1 Generator

  1. Type or paste your text into the input box.
  2. The SHA-1 hash updates live as you type.
  3. Click Copy hash to copy the 40-character hex digest.

Features

Live SHA-1 hashing; 40-character hex output; Unicode-safe; copy button; no uploads, no accounts.

Benefits & Use Cases

Useful when working with Git object IDs, verifying legacy checksums published as SHA-1, or interoperating with older systems that still speak SHA-1.

Tips

Treat SHA-1 like MD5: fine for identifiers and integrity checks, never for passwords or signatures. If you are choosing a hash for something new, pick SHA-256.

Frequently Asked Questions

What is SHA-1?

SHA-1 is a cryptographic hash function producing a 40-character hexadecimal digest. It was widely used in the 2000s before collision attacks made it obsolete for security.

Is SHA-1 still safe to use?

Only for non-security purposes. Practical collision attacks exist, so it must not protect passwords, certificates, or signatures. SHA-256 is the modern replacement.

Why does Git use SHA-1?

Git was designed when SHA-1 was still trusted, using it to identify commits and objects. Git is migrating toward SHA-256, but SHA-1 remains common in existing repositories.

How is SHA-1 different from MD5?

SHA-1 produces a longer 160-bit digest versus MD5's 128 bits, and resisted attacks longer — but both are now considered broken for security use.

Related Tools

MD5 Generator

Generate MD5 hashes instantly with NToolHub’s free tool. Live hashing as you type, uppercase option, file checksum mode — private.

Open tool →

SHA256 Generator

Generate SHA-256 hashes instantly with NToolHub’s free tool. Live text hashing, local file checksums — secure, fast, 100% private.

Open tool →

SHA512 Generator

Generate SHA-512 hashes instantly with NToolHub’s free tool. 128-char digests, live hashing, file checksums — 100% private in-browser.

Open tool →

Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes at once with NToolHub’s free tool. Compare algorithms side by side — private in-browser hashing.

Open tool →

Checksum Generator

Create MD5, SHA-1, SHA-256 or SHA-512 checksums free with NToolHub. Hash text or files locally to verify integrity — nothing is uploaded.

Open tool →