SHA1 Hash Generator - Generate SHA1 Hash Online

Our free SHA1 hash generator allows you to generate SHA1 hash values for text or files instantly. SHA1 (Secure Hash Algorithm 1) produces a 160-bit (20-byte) hash value, typically rendered as a 40-digit hexadecimal number. While SHA1 is now considered cryptographically broken and should not be used for new security-sensitive applications, it's still useful for checksums, data integrity verification, and legacy system compatibility.

What is SHA1?

SHA1 is a cryptographic hash function that takes input data and produces a fixed-size hash value. It's designed so that even a small change in the input will produce a dramatically different hash output.

Key Features

Text & File Support: Generate hashes from text input or file uploads
Secure Processing: All hashing happens in your browser
Real-time Generation: Get hash values instantly
Easy Copy: Copy hash values with one click

Important Security Note

SHA1 is cryptographically broken and should not be used for new security applications. For new projects, use SHA-256, SHA-512, or SHA-3. SHA1 may still be useful for checksums and data integrity verification in non-security contexts.

Common Use Cases

Data integrity verification
Checksums for file verification
Legacy system compatibility
Git commit hashes (SHA1 format)

Frequently Asked Questions

Is the SHA1 hash generator free to use?

Yes, our generator is completely free to use with no registration or usage limits.

Is SHA1 secure for passwords?

No, SHA1 should not be used for password hashing. Use bcrypt, Argon2, or other password-specific hashing algorithms instead.

Can I hash files?

Yes, you can upload files and generate SHA1 hashes for them. The file is processed entirely in your browser.