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SHA1 Hash Generator

Generate SHA-1 hashes from text for legacy systems, old APIs, checksum examples, and migration fixtures.

SHA-1160-bitUTF-8Browser based

Last updated: May 30, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution

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What is SHA1 Hash Generator?

SHA-1 is a 160-bit hash function from the Secure Hash Algorithm family. It is still found in older systems and fixtures, but it is deprecated for collision-resistant security.

Use this page when compatibility requires SHA-1 output. For new integrity and signing workflows, prefer SHA-256 or stronger algorithms.

How to Use SHA1 Hash Generator

1

Type or paste the text you want to hash

2

Review the generated SHA-1 output

3

Toggle uppercase if your target system expects capital hex

4

Copy the digest for comparison or fixtures

Common Use Cases

  • Matching old SHA-1 checksum examples.
  • Testing migration code that still reads SHA-1 digests.
  • Creating legacy API fixtures.
  • Comparing digest behavior against SHA-2 outputs.

Example Input and Output

Generate the standard SHA-1 digest for a short string.

Input text
abc
SHA-1 hash
a9993e364706816aba3e25717850c26c9cd0d89d

How This Tool Works

The tool encodes input as UTF-8 bytes, applies SHA-1 padding and compression locally, and formats the 160-bit digest as hexadecimal.

Technical Stack

TypeScriptSHA-1UTF-8 TextEncoderClient-side hashing

Variant

FIPS 180 SHA-1 over UTF-8 input bytes.

Security note

SHA-1 remains useful for legacy compatibility, but not for new security-sensitive designs.

Frequently Asked Questions

Is SHA-1 secure today?
No. SHA-1 is deprecated for collision-resistant use. Prefer SHA-256 or stronger algorithms.
How long is a SHA-1 hash?
SHA-1 outputs 160 bits, displayed as 40 hexadecimal characters.
Can I use SHA-1 for passwords?
No. Use Argon2, bcrypt, or scrypt for password storage.
Is input uploaded?
No. Hashing runs locally in your browser.

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