Code Tools

Online Diff & Merge

Online Diff & Merge — diff two versions and merge by accepting the left or right side. It runs locally in your browser with no uploads and no sign-up.

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

Online Diff & Merge is a free Code Tools utility that runs entirely in your browser — nothing you enter is uploaded.

Left / A
Right / B
Diff & merge



  
How to use Online Diff & Merge

  
    
      
  1. Type or paste your text into Online Diff & Merge's input area.
    2. 
      
  2. Hit Accept left — the compared output appears below at once.
    3. 
      
  3. Use Copy to keep or reuse the result.
    4. 
  

  
About this tool

  
Everything Online Diff & Merge does happens on your own device. Online Diff & Merge 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. Nothing you enter is uploaded, and it keeps working offline once the page has loaded.

  
Frequently asked questions

  

      
What does Online Diff & Merge do?
Use Online Diff & Merge to compare your input without installing anything; everything happens client-side.

      
Does Online Diff & Merge cost anything?
No — Online Diff & Merge is completely free, with no sign-up and no hidden limits.

      
Does Online Diff & Merge upload my data?
No — Online Diff & Merge processes everything locally in your browser, so nothing you enter is uploaded or stored.

      
Does Online Diff & Merge work offline?
Once the page has loaded, Online Diff & Merge keeps working with no network connection.

  

  
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