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SHA-1 Hash Generator — Free Online SHA-1 for Git & Legacy

Compute SHA-1 digest of text or files in your browser using Web Crypto API. Useful for Git commit hashes and legacy systems.

Free No signup Client-side Privacy friendly Updated

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Hashing…

How to use

  1. 1 Pick Text or File mode.
  2. 2 Type / paste text, or choose a file (≤ 50 MB).
  3. 3 Pick output encoding (hex or Base64).
  4. 4 Copy the digest.

Why use this tool

  • Uses native Web Crypto API.
  • Common in legacy systems — Git object IDs, older TLS, some integrity checks.
  • Output in hex (40 chars) or Base64 (28 chars).
  • Pure client-side.

Frequently asked questions

Is SHA-1 still safe?

No — SHA-1 has practical collision attacks (SHAttered, 2017). Do not use SHA-1 for digital signatures or any anti-tamper purpose. Use SHA-256 instead.

Why is SHA-1 still around?

Legacy compatibility — Git uses it for object IDs (with collision-detection patches), some older TLS deployments, and historical file checksums.

Does this work offline?

Yes — hashing runs entirely in your browser once the page loads.

What is SHA-1 Hash Generator?

A SHA-1 Hash Generator is a tool that computes the SHA-1 message digest of text or files, producing a fixed-length checksum useful for Git commit hashes and legacy systems. It uses the browser's native Web Crypto API to perform the hashing and outputs the digest in hexadecimal or Base64 encoding. The computation runs entirely in the browser, so the input is processed client-side and is never uploaded to a server.

Features

Web Crypto hashing

Computes the 160-bit digest locally with the browser's SubtleCrypto API.

Hex or Base64

Output as 40 hex characters or Base64.

100% private

Your input is hashed in the browser and never uploaded.

Example

Input

Hello, Zerethon!

Output

3f355878270fdd74b3a61653a94565a723c0877a

Common use cases

  1. 1

    Match a Git object hash

    Reproduce or verify a SHA-1 identifier as used by Git for commits and blobs.

  2. 2

    Integrate with legacy systems

    Produce SHA-1 checksums required by older tools and protocols.

  3. 3

    Understand why SHA-1 retired

    Compare SHA-1 with SHA-256 to see why security-sensitive uses moved on.

Summary

Zerethon's SHA-1 generator computes the FIPS 180-4 / RFC 3174 digest of text or files in your browser via the Web Crypto API, with hex or Base64 output. SHA-1 is still used by Git and legacy systems, but it is broken for collision resistance (SHAttered, 2017) — do not use it for security. Free, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. SHA-1 Hash Generator runs entirely client-side — no server upload, no logging, no tracking of your input.

Compare

MD5 vs SHA-256 MD5 vs SHA-1 SHA-1 vs SHA-256

Learn the basics

What is Hash function?

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