SHA-1 Hash Generator
This SHA-1 generator creates 160-bit digests from text or files, entirely in your browser. The page loads with SHA-1 selected, so pasting text shows the 40-character hex hash at once; HMAC mode, uppercase output, and file input are one click away. SHA-1 has been deprecated by NIST for digital signatures because practical collision attacks exist, so treat it as a legacy compatibility tool: Git object IDs and older checksum workflows still rely on it, but new security work should use SHA-256 or SHA-512. Nothing is uploaded, hashing uses JavaScript on your device. Copy or download the result instantly.
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How to use this tool
Overview
This SHA-1 generator creates 160-bit digests from text or files, entirely in your browser. The page loads with SHA-1 selected, so pasting text shows the 40-character hex hash at once; HMAC mode, uppercase output, and file input are one click away. SHA-1 has been deprecated by NIST for digital signatures because practical collision attacks exist, so treat it as a legacy compatibility tool: Git object IDs and older checksum workflows still rely on it, but new security work should use SHA-256 or SHA-512. Nothing is uploaded, hashing uses JavaScript on your device. Copy or download the result instantly.Formula
SHA-1: 160-bit hash value (40 hex characters)Frequently asked questions
Is SHA-1 still safe? +
Not for security: collision attacks are practical, so NIST deprecated SHA-1 for signatures. Use it only for legacy compatibility such as Git object IDs, and choose SHA-256 for new work.
How long is a SHA-1 hash? +
160 bits, shown as 40 hex characters. A common example is da39a3ee5e6b4b0d3255bfef95601890afd80709 for an empty input.
Where is SHA-1 still used? +
Git uses SHA-1 for commit and blob identifiers, and some older systems compute SHA-1 file checksums. For new projects use the SHA-2 or SHA-3 families.
What hash algorithms does the tool support? +
This tool supports MD5, SHA-1, SHA-256, SHA-384, SHA-512, and other common cryptographic hash functions.
Can I hash files as well as text? +
Yes. Paste text directly or upload a file and the tool generates the hash for the content.
Are hashes generated in the browser? +
Yes. All hashing happens locally in your browser. Your data is never sent to any server.
What is the difference between MD5 and SHA-256? +
MD5 produces a 128-bit hash and is considered cryptographically broken. SHA-256 produces a 256-bit hash and is currently secure. Use SHA-256 for security purposes.