SHA-1 Generator

Generate a SHA-1 hash from any text online, right in your browser.


  

  

    
    
    
  

  


    

    

      
ToolsSoup's SHA-1 Generator is a free online tool that turns any text into its SHA-1 hash entirely in your browser. Paste a word, a string, or a whole document and instantly get the 40-character hexadecimal digest — with no uploads, no sign-up, and nothing ever leaving your device.

      

        
What is SHA-1?

        
SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function designed by the U.S. National Security Agency and published by NIST in 1995. It takes input of any length and produces a fixed 160-bit (20-byte) output, usually written as 40 hexadecimal characters. The same input always yields the same hash, while even a one-character change produces a completely different result. SHA-1 is one-way: you cannot recompute the original text from the hash. Although it remains common for non-security checksums and as the legacy commit identifier in Git, SHA-1 is no longer considered safe against deliberate collision attacks and should not be used for new security-critical work.

        
      

      

        
How to generate a SHA-1 hash online

        
Creating a SHA-1 hash with ToolsSoup takes just a few seconds:

        
  1. Type or paste the text you want to hash into the input box.
  2. Click Generate hash to compute the SHA-1 digest.
  3. Copy the 40-character hexadecimal result with one click and use it wherever you need it.

      

      

        
What format is the output?

        
The hash is shown as a lowercase hexadecimal string of exactly 40 characters, which represents the 20 raw bytes of the digest. Your text is first encoded as UTF-8 before hashing, so accented letters, non-Latin scripts, symbols, and emoji all hash consistently. The computation uses your browser's built-in Web Crypto API, the same vetted implementation that powers secure features in modern browsers.

        
      

      

        
Why use this SHA-1 generator?

        
  • 100% free with no ads, sign-up, or usage limits.
  • Runs entirely in your browser — your text is never uploaded to a server.
  • Uses the native Web Crypto API for fast, standards-compliant hashing.
  • Outputs the standard 40-character lowercase hexadecimal digest.
  • Handles UTF-8, so any language, symbol, or emoji hashes correctly.
  • Works offline once the page has loaded.

      

      

        
Frequently asked questions

        

          
Is this SHA-1 generator free?

          
Yes. Every tool on ToolsSoup is completely free to use, with no account, sign-up, or hidden limits.

        

        

          
Is my data safe?

          
Absolutely. Hashing happens entirely in your browser using the Web Crypto API, so your text is never sent to or stored on any server. For maximum safety with sensitive input, you can disconnect from the internet after the page loads.

        

        

          
Is SHA-1 still secure?

          
Not for security purposes. Practical collision attacks against SHA-1 were demonstrated in 2017, so it should not be used for digital signatures, certificates, or password storage. It is still perfectly fine for non-adversarial uses such as file checksums, deduplication, and as a content identifier.

        

        

          
Can a SHA-1 hash be reversed back to the original text?

          
No. SHA-1 is a one-way function, so there is no way to compute the input from the hash. The only way to find the original is to guess inputs and hash them until one matches.

        

        

          
What is the difference between SHA-1 and SHA-256?

          
SHA-1 produces a 160-bit (40-character) digest, while SHA-256 produces a stronger 256-bit (64-character) digest from the newer SHA-2 family. For any new security-related work, prefer SHA-256 or another modern hash; reach for SHA-1 only when you need compatibility with existing systems such as Git.