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SHA-1 Calculator

Calculate SHA-1 hash digest of hex string input — 160-bit output as 40-character hex

🔒 Input

Enter hex bytes (e.g. 48656C6C6F for "Hello"). Spaces are allowed. Leave empty and check "Hash empty message" to hash zero-length input.

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📖 About This Tool

What is the SHA-1 Calculator?

The SHA-1 Calculator computes SHA-1 hash digests from hexadecimal input. SHA-1 produces a 160-bit (40 hex character) hash value commonly used in certificate fingerprints and legacy HMAC calculations.

🛠️ How to Use
  1. Enter your hexadecimal data.
  2. Click Calculate to compute the SHA-1 hash.
  3. Copy the 40-character hex digest.
❓ FAQ

Is SHA-1 still secure?

SHA-1 is considered cryptographically weak for digital signatures and certificates due to demonstrated collision attacks. However, it remains acceptable for HMAC and non-collision-resistance applications like checksums.