Built and fact-checked by the DocNectar team — see our editorial standards
Key Features
Instant Calculation
Get accurate results in real time with our optimized algorithm.
Mobile Friendly
Fully responsive design. Works on all devices & screen sizes.
Privacy Focused
Your data stays on your device. We don't store any inputs.
100% Free
No hidden costs. This tool is completely free forever.
A "mailto:" link opens the visitor's default email app with the recipient, subject, and body already filled in — a simple way to make an email link more useful than just a bare address. This tool builds that link using the standard RFC 6068 mailto: format.
How it works
Enter a recipient email address and, optionally, a subject, body, CC, and BCC. The tool builds a mailto: link including only the fields you actually filled in, with each value properly URL-encoded.
- Enter to email address.
- Enter subject (optional).
- Enter body (optional).
- Enter cC (optional, comma-separated).
- Enter bCC (optional, comma-separated).
- Click Calculate to see your results.
Examples
A pre-filled feedback link
A "Send Feedback" link with a pre-filled subject like "Website Feedback" saves the visitor from typing one themselves and makes incoming messages easier to filter.
Who should use it
- Adding a "Contact us" or "Send feedback" link to a website.
- Pre-filling a support or sales email with a helpful subject line.
Industry applications
- Customer support and contact forms
- Marketing and sales contact links
Advantages
- No app install or API integration needed — it's just a link.
- Works with the visitor's own email client, not a third-party service.
Limitations
- Pre-filled body length and formatting support can vary slightly between different email clients.
Common mistakes to avoid
- Assuming the visitor's default email app is a webmail service — mailto: links open whatever email client is set as default on their device, which might not be what you expect.
- Forgetting that very long pre-filled bodies can be cut off or behave inconsistently across different email clients — keep it reasonably short.
Best practices
- Keep the pre-filled subject and body short and generically useful, since not every visitor's email client handles long mailto bodies identically.
- Test the generated link yourself in your own email client before publishing it widely.
Tips
- If you need more reliable formatting than a mailto: body supports, consider a real contact form instead — mailto: is best for short, simple pre-fills.