Blue Folder

EMAIL UTILITIES

Email utilities

Five small, fast tools for people who run their own mail: inspect raw headers, build a clean signature, generate strong secrets, make favicons, and create tracked QR codes. Everything runs in your browser — nothing is uploaded.

Header analyzer Signature Password Favicon QR & UTM

Email header analyzer

Paste the raw headers of a message (in most clients: View Source / Show Original). It parses the envelope, traces every Received: hop with delays, and reads the SPF / DKIM / DMARC results.

Email signature generator

Fill in your details for a clean, email-safe HTML signature (inline styles, table layout). Copy the HTML for your client's signature settings, or copy it as rich text to paste straight into a compose window.

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Strong password & passphrase generator

    
Generated locally with your browser's cryptographic random source. Nothing is transmitted or stored.


    

      
      
    


    

      
      
      

        
        
        
        
      

    


    

    

      

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Favicon & app-icon generator

    
Upload a square-ish image (PNG, JPG, or SVG) — or start from the Blue Folder icon — and export crisp PNGs at every size a site needs: 16, 32, 48, 180 (Apple touch), 192 and 512.

    

      
      
      
    

    
    
Choose a source image to generate downloadable icons.

    
  


  

    Running mail for your own domains? Blue Folder Mail gives every domain you own one private, end-to-end encrypted inbox for a single price — no per-mailbox fees, no snooping. See pricing →
  


  
  

    
QR code + UTM link builder

    
Assemble a campaign-tracked link, then turn any URL or email address into a scannable QR code you can download as a PNG. The QR engine runs entirely in this page.


    
A · UTM link builder

    

    

      

      

    

    

      

      

      

    

    

      

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B · QR code