Question 1

What is SHA-1?

Accepted Answer

SHA-1 (Secure Hash Algorithm 1) produces a 160-bit (20-byte) hash value, rendered as a 40-character hexadecimal string.

Question 2

Is SHA-1 secure?

Accepted Answer

SHA-1 is deprecated for security use. Collision attacks have been demonstrated. Use SHA-256 or SHA-3 for security-critical applications.

Question 3

What is the maximum file size supported?

Accepted Answer

This tool supports files up to 50 MB. The file is processed entirely in your browser using the Web Crypto API.

Question 4

Is my data sent to a server?

Accepted Answer

No. All hashing happens locally in your browser using the native Web Crypto API. Your data never leaves your device.

Question 5

Why is SHA-1 still used?

Accepted Answer

SHA-1 is still used in legacy systems, Git commit hashes, and non-security checksums where collision resistance is not critical.

Question 6

How fast is this tool?

Accepted Answer

It uses the browser's native Web Crypto API (crypto.subtle.digest), which is hardware-accelerated and very fast.

SHA-1 Hash Generator

Frequently Asked Questions