Is SHA-1 secure for passwords?

No. SHA-1 is considered cryptographically weak and should not be used to hash passwords. Use bcrypt, Argon2, or PBKDF2 for passwords instead. SHA-1 is still useful for checksums and non-security-critical fingerprinting.

Does this tool send my text to a server?

No. All computation is performed locally in your browser using the Web Crypto API. Your input never leaves your device.

Why is my SHA-1 hash always 40 characters?

SHA-1 always produces a 160-bit digest, which is represented as 40 hexadecimal characters regardless of the input length.

What is the difference between SHA-1 and SHA-256?

SHA-256 produces a 256-bit (64 hex character) digest and is significantly more collision-resistant. SHA-1 is faster but deprecated for security use. Both are members of the SHA family.

Can two different inputs produce the same SHA-1 hash?

Theoretically yes — this is called a collision. SHA-1 collisions have been demonstrated in research, which is why it is no longer recommended for security-sensitive purposes.

SHA1 Hash Generator

Type or paste any text and instantly get its SHA-1 hash — computed entirely in your browser.

Input Text

Output format: lowercase UPPERCASE

0 characters

SHA-1 Hash

Your SHA-1 hash will appear here

Algorithm

SHA-1

Output size

40 hex chars

Engine

Web Crypto API

Data sent

None (local)

Copied!

Summary

This tool computes the SHA-1 (Secure Hash Algorithm 1) digest of any text you enter. It uses the browser's built-in Web Crypto API, so your input never leaves your device. SHA-1 produces a 160-bit (40 hex character) fingerprint that uniquely identifies the input data.

How it works

Type or paste your text into the input box.
The SHA-1 hash is computed instantly using the Web Crypto API.
The 40-character hex digest appears in the output field.
Click "Copy" to copy the hash to your clipboard.
Toggle uppercase/lowercase output to match your needs.

Use cases

Verify file integrity by comparing SHA-1 checksums.
Quickly hash strings during development and testing.
Generate reproducible identifiers for text content.
Check if two pieces of text are identical without comparing them directly.
Learn how cryptographic hash functions work hands-on.
Debug or validate SHA-1 outputs from your own code.

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu