checksum Tools

File Checksum Tool

File Checksum Tool computes a file's SHA-1 checksum locally with chunked reads and compares it to an expected value. Free, fast, and completely private.

Client-sideRuns entirely in your browser — your data never leaves your device.

File Checksum Tool is a free checksum Tools utility that runs entirely in your browser — nothing you enter is uploaded.

Choose a file
Checksum



  
How to use File Checksum Tool

  
    
      
  1. Start by adding the text you want to check into File Checksum Tool.
    2. 
      
  2. Tune the Algorithm, Expected checksum (optional) controls before you check.
    3. 
      
  3. The result is computed live in your browser as you edit the input.
    4. 
      
  4. Finish by choosing Copy to take the output with you.
    5. 
  

  
About this tool

  
File Checksum Tool runs entirely in your browser. File Checksum Tool handles your input locally and returns the result instantly, with no sign-up.

  
Because it runs on your device, it is fast and private and works offline once loaded. No data is sent anywhere, so it stays fast and private by default.

  
Frequently asked questions

  

      
What does File Checksum Tool do?
File Checksum Tool lets you check your input right in the browser using the Algorithm, Expected checksum (optional) controls, with the result shown instantly and nothing uploaded.

      
Does File Checksum Tool cost anything?
No — File Checksum Tool is completely free, with no sign-up and no hidden limits.

      
Does File Checksum Tool upload my data?
No — File Checksum Tool processes everything locally in your browser, so nothing you enter is uploaded or stored.

      
Does File Checksum Tool work on mobile?
Yes — File Checksum Tool is just a web page and runs on any modern browser, including phones and tablets.

  

  
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