SHA-1 Generator
Convert text, keys and short inputs into SHA-1 hashes for tests, checks and compatibility with legacy systems.
The hash is calculated locally in your browser with Web Crypto. No text is sent to servers.
Generated SHA-1 hash
Local processing: your text is not sent, saved or logged.
Quick answer
This generator turns text into a 40-character hexadecimal SHA-1 hash. It accepts free text, calculates the result in the browser and lets you copy or download the hash for tests, checksums and legacy integrations.
Important note
SHA-1 is not recommended for digital signatures, passwords or modern security. Use SHA-256, SHA-512, bcrypt or Argon2 when the goal is real protection.
How to use the SHA-1 generator
Type or paste text into the main field, choose whether to display uppercase output and click generate. The result appears in focus for copy or download.
Available options
The tool offers free text input, a quick sample, lowercase or uppercase output, clipboard copy, TXT download and form clearing.
How SHA-1 is generated
The browser converts the text into UTF-8 bytes and calculates the SHA-1 digest through crypto.subtle.digest. The 160-bit result is displayed as 40 hexadecimal characters.
Practical example
Input: Novemax online tools. SHA-1 output: a 40-character hexadecimal hash. If you add a trailing space, the result changes.
How to interpret and reuse the result
Use SHA-1 to compare content, validate old checksums or support systems that still require this format. Do not use SHA-1 for passwords, new digital signatures or sensitive data.
Useful tips
Check whether the input includes exactly the expected spaces, accents and line breaks. For large files, prefer local tools or dedicated libraries.
Frequently asked questions
What is SHA-1?
SHA-1 is a hash function that produces a 160-bit digest, usually displayed as 40 hexadecimal characters.
Is SHA-1 safe for passwords?
No. SHA-1 should not be used for passwords or modern security because it is no longer considered strong enough against current attacks.
Is the typed text sent to a server?
No. The calculation happens in your browser through Web Crypto and the page does not send the input to servers.
Is SHA-1 better than MD5?
SHA-1 produces a larger hash than MD5, but both are unsuitable for modern security. For new applications, prefer SHA-256 or proper password algorithms.