Just Tool It
Just Tool It / Flex / Grid Playground
On-device — nothing uploaded

Flexbox / Grid Playground

Drag the knobs. Watch the layout react. Copy the CSS.

Container

Items

Preview

Generated CSS


              

                
              

            

          

        


        

          

            

              
Container

              
              
              
              
              
              

              
Items

              

                
                
              

              

            

            

              
Preview

              

              
Generated CSS

              

              

                
              

            

          

        

      


      

        

          
Why use Flex / Grid Playground in your browser?

          

            Developer paste bins often contain tokens, configs, and customer data. Flex / Grid Playground: Drag the
            knobs. Watch the layout react. Copy the CSS. Server-side tools upload or log inputs. Just Tool It does not:
            it uses pure JavaScript and Web APIs (no network calls for your input). Close the tab and the working data
            is gone. That is zero-server processing and on-device security.
          

        


        

          
How to use Flex / Grid Playground

          
    
            
  1. 
              Open the tool on this page — no account or email required.
            
    2. 
            
  2. 
              Add your input by dropping a file, pasting text, or filling the form fields.
            
    3. 
            
  3. 
              Adjust options if available (quality, format, ranges, etc.).
            
    4. 
            
  4. 
              Run the tool and download (or copy) the result. Nothing was uploaded to Just Tool It.
            
    5. 
          

        


        

          
Frequently asked questions


          

            
              Is my data uploaded when I use Flex / Grid Playground?
            
            

              No. Just Tool It is a static web app. Your input is processed with pure JavaScript and Web APIs (no
              network calls for your input). You can verify in the browser Network panel: no file payloads are sent to
              our origin for processing.
            

          


          

            Is this tool free? Do I need an account?
            

              Yes, it is free. There is no sign-up, paywall, or trial. We do not create user accounts because we never
              receive your files.
            

          


          

            Does it work offline?
            

              After the page and any required libraries are cached (including via the service worker / PWA), many tools
              keep working without a network. Large optional engines such as FFmpeg.wasm or OCR models still need a
              one-time download.
            

          


          

            
              How is this different from other free online tools?
            
            

              Most free tools upload files to a cloud worker. Just Tool It emphasizes zero-server processing and
              on-device security: files stay in browser memory until you download the output and close the tab.