BYTETOOLS

SHA-1 Hash Generator

Compute SHA-1 hashes of text or files in your browser using Web Crypto. 40-character hex digest with uppercase option and instant copy. Free and private.

SHA-1 hash

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What is the SHA-1 Hash Generator?

The ByteTools SHA-1 Hash Generator produces the 160-bit SHA-1 digest of any text or file as a 40-character hexadecimal string.

  • Native Web Crypto hashing — fast and standards-correct
  • Text and file input, any file type
  • 40-character hex digest, lowercase or uppercase
  • One-click copy
  • 100% client-side — files never leave your device
  • Live hash while you type

How to use the SHA-1 Hash Generator

  1. 1

    Select Text or File mode with the tabs.

  2. 2

    Enter your text or drop a file into the upload area.

  3. 3

    The SHA-1 hash appears instantly in the result box.

  4. 4

    Toggle Uppercase if needed and click Copy.

About the SHA-1 Hash Generator

The ByteTools SHA-1 Hash Generator produces the 160-bit SHA-1 digest of any text or file as a 40-character hexadecimal string. It uses your browser's native Web Crypto API, so hashing is fast and accurate even for large files.

SHA-1 shows up everywhere in developer tooling: Git identifies every commit and object by its SHA-1, many package archives publish SHA-1 checksums, and legacy protocols and databases still store SHA-1 values you may need to reproduce or verify.

Hashing runs 100% locally — your input is never uploaded to a server. Note that SHA-1 is cryptographically broken for collision resistance, so use SHA-256 for anything security-sensitive; this tool exists for compatibility and integrity checks.

Frequently asked questions

Is SHA-1 still secure?

Not for cryptographic purposes. Practical collision attacks (SHAttered, 2017) mean attackers can craft two different files with the same SHA-1, so certificates and signatures moved to SHA-256. It remains fine for non-adversarial integrity checks and required for legacy compatibility.

Why does Git use SHA-1?

Git uses SHA-1 as a content address to identify commits, trees and blobs — a design choice from 2005. Because collisions are now feasible, Git added a hardened SHA-1 variant that detects known attack patterns and is transitioning toward SHA-256 repositories.

How long is a SHA-1 hash?

SHA-1 always outputs 160 bits, written as 40 hexadecimal characters. The length never changes with input size — a one-word string and a 10 GB file both yield 40 hex characters.

What's the difference between SHA-1 and MD5?

Both are legacy hash functions, but SHA-1 outputs 160 bits versus MD5's 128 and is somewhat harder to attack. Both are considered broken for security use; for new systems choose SHA-256 or SHA-512.

Can I verify a file's SHA-1 checksum with this tool?

Yes. Drop the downloaded file in, then compare the resulting 40-character digest with the checksum the publisher lists. If even one character differs, the file was corrupted or altered in transit.

Guides for SHA-1 Hash Generator

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