SHA-1 Hash Generator - SHA-1 Encrypt

SHA-1 Hash Generator - Generate SHA-1 Checksums Online

A free online SHA-1 hash generator that creates 160-bit SHA-1 checksums from any text input. Perfect for developers and system administrators needing SHA-1 hashes for legacy systems, Git commits, and development testing. Fast, client-side processing with instant results.

What is SHA-1 hash?

SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function that produces a 160-bit (20-byte) hash value, displayed as a 40-character hexadecimal number.

Key characteristics:
- Always produces 40 hexadecimal characters
- Same input = same hash (deterministic)
- One-way function (cannot reverse)
- Faster than SHA-256/512

Example:
Input: "Hello" → SHA-1: f7ff9e8b7bb2e09b70935a5d785e0cc5d9d0abf0

Note: SHA-1 is deprecated for security use since 2017 due to collision attacks.

Is SHA-1 secure?

NO! SHA-1 is NO LONGER secure for cryptographic purposes.

Why SHA-1 is broken:
✗ Collision attacks demonstrated (2017)
✗ Deprecated by major browsers
✗ Not accepted for SSL certificates
✗ Vulnerable to attacks

Still used for:
✓ Git commit IDs (low risk)
✓ Legacy system compatibility
✓ Non-security checksums
✓ Development testing

For security, use:
✓ SHA-256 (recommended)
✓ SHA-512 (strong)
✓ SHA-3 (modern)
✓ bcrypt/Argon2 (passwords)

What is SHA-1 used for today?

SHA-1 is still used in non-security contexts:

✓ Valid uses:
- Git commit identifiers
- Legacy system compatibility
- Non-critical checksums
- Development and testing
- Historical data integrity

✗ Do NOT use for:
- SSL/TLS certificates
- Digital signatures (security)
- Password hashing
- New cryptographic applications

Recommendation: Use SHA-256 or SHA-512 for new projects.

How do I generate a SHA-1 hash?

Simply enter your text and click 'Generate Hash':

1. Type or paste text in the input field
2. Choose output format (lowercase or uppercase)
3. Click 'Generate Hash' button
4. Copy the 40-character hash from the output

Example:
Input: "password123"
SHA-1: cbfdac6008f9cab4083784cbd1874f76618d2a97

The hash is generated instantly using Web Crypto API.

What's the difference between SHA-1, SHA-256, and SHA-512?

These are all SHA family hash functions with different output sizes and security levels:

SHA-1:
- Output: 160 bits (40 hex chars)
- Security: Deprecated (collisions found)
- Speed: Fast
- Use: Legacy only

SHA-256:
- Output: 256 bits (64 hex chars)
- Security: Secure
- Speed: Moderate
- Use: Recommended for security

SHA-512:
- Output: 512 bits (128 hex chars)
- Security: Very secure
- Speed: Moderate-slow
- Use: High security needs

Recommendation:
- New projects: SHA-256 or SHA-512
- Legacy compatibility: SHA-1 okay
- Passwords: Use bcrypt/Argon2, not SHA

Key Features

• Generate SHA-1 hash from any text instantly
• 160-bit (40-character) hash output
• Lowercase or uppercase hexadecimal format
• Web Crypto API for fast hashing
• Input length statistics
• Copy hash to clipboard
• Download hash as text file
• Upload files to hash content
• Dark mode support
• 100% client-side processing
• Works offline after initial load
• Mobile-friendly responsive design
• Support for Unicode and emoji
• No registration required