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Jason Local spreadsheet
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Local import Confirm the file structure.


Jason inspects only the first 64 KB to suggest a delimiter. The file remains on this device.

Inspecting the bounded sample…

Drop the CSV here.

        

        

          
          
        

      

    


    

      
    


    

      
    


    

      
    


    

      

        

        

        

          
        

      

    


    
      

        
Local deletion

        Remove this project?
        

           and its browser-local working
          data will be permanently deleted. Back up or export before continuing.
        

        

          
          
        

      

    

    

      

        

          

            
Local CSV workspace

            
Drop the file. Keep the data.

            

              Jason turns a CSV into a fast, compressed workspace in this browser.
              The file and every edit stay on this device.
            

          


          

            
            
            

              
              
            

          

        


        

        

          

            
Recent projects

            
Browser-local / this profile

          

          

            

            
    
            
    
          
    
        
    

        
    
          A .jason backup contains the full spreadsheet and formulas and is not encrypted.
        
    
        
    
          Data boundary
          
            Source bytes, cells, formulas, backups, and exports stay on this
            device. Account and license requests do not contain project content.