A mailto link is one of the oldest tricks on the web — and one of the most underused. Click it, and your email client opens with the recipient address, subject line, and even body text already filled in. Done right, it removes real friction from the contact experience. This guide covers everything: the full mailto syntax, all supported parameters, URL encoding, CC and BCC, when to use a mailto link versus a contact form, and how to generate one without writing a single URL-encoded character by hand.
What Is a Mailto Link?
A mailto link is an ordinary HTML anchor tag that uses the mailto: URI scheme instead of http://. When a browser encounters it, rather than loading a web page, it hands control to the operating system, which passes it to the user's default email client — Gmail, Outlook, Apple Mail, or whatever is configured.
The simplest version looks like this:
<a href="mailto:hello@example.com">Send us an email</a>That's it. One line. The user clicks, their email app opens, and hello@example.com is already in the To field.
The Full Mailto URL Format
The mailto scheme supports five parameters to pre-populate the entire email compose window:
- to — recipient email address (can be in the URL or after
mailto:) - subject — email subject line
- body — email body text
- cc — carbon copy address(es)
- bcc — blind carbon copy address(es)
A fully populated example:
mailto:hello@example.com?subject=Website%20Inquiry&cc=manager@example.com&bcc=archive@example.com&body=Hi%2C%20I%20found%20your%20site%20and%20wanted%20to%20ask%20about%20pricing.URL Encoding: What It Is and Why It Matters
URLs cannot contain raw spaces or special characters. Every special character must be percent-encoded. The most common ones you'll encounter in mailto links:
- Space →
%20 - Line break →
%0A - @ sign →
%40 - Comma →
%2C - Ampersand →
%26 - Question mark →
%3F - Colon →
%3A
You don't need to memorize these. Our generator handles all encoding automatically — you type in plain English and get a properly encoded URL out. But understanding why the link looks the way it does helps you debug a malformed URL if something goes wrong.
Adding a Pre-Filled Subject Line
The subject parameter saves recipients — and you — a lot of back-and-forth. If someone clicks "Request a Quote," you probably want the email to arrive with "Quote Request" in the subject, not a blank line.
<a href="mailto:hello@example.com?subject=Quote%20Request">Request a Quote</a>Pre-Filling the Email Body
You can go further and pre-fill the message body. This is particularly useful for support requests where you want to prompt the user to include their order number or account details:
<a href="mailto:support@example.com?subject=Support%20Request&body=Hello%2C%0A%0AOrder%20number%3A%20%0A%0AIssue%3A">Contact Support</a>That looks messy written by hand — a simple template becomes a string of percent signs nearly impossible to write or read manually. This is exactly why a mailto generator exists.
CC, BCC, and Multiple Recipients
The mailto scheme supports CC and BCC fields, and you can add multiple addresses to any field by separating them with commas:
mailto:primary@example.com?cc=manager@example.com&bcc=archive@example.com&subject=Project%20UpdateA few things to know: CC is universally reliable across all email clients. BCC works in most clients but not all — if you're relying on BCC for something critical, test it across Gmail, Apple Mail, and Outlook before deploying. For multiple To addresses, separate them with commas: mailto:alice@example.com,bob@example.com.
How to Build a Mailto Link in 3 Steps (No Coding)
Step 1: Open InstantLinkHub's Mailto Generator and enter your recipient email address.
Step 2: Fill in the optional fields — subject, body, CC, BCC — in plain text. No encoding needed.
Step 3: Copy the generated <a href="mailto:..."> HTML tag and paste it into your site.
The process takes about thirty seconds. No account, no signup, no expiry.
Real-World Use Cases
Portfolio websites: A "Hire me" mailto link with your name and rate pre-filled in the subject does the job without the overhead of a backend contact form system.
Freelance designer example:
<a href="mailto:hello@designersite.com?subject=Project%20Inquiry&body=Hi%2C%20I%20found%20your%20portfolio%20and%20I%27d%20like%20to%20discuss%20a%20project.">Start a project →</a>When a potential client clicks it, their email client opens with the designer's address, a professional subject line, and a natural opening already in place. The client only needs to add project details.
Email newsletters: "Forward to a colleague" buttons in HTML emails often use mailto links. The subject and body encourage the reader to share specific content.
Event invitations: RSVP links can use mailto to open a compose window with the event name and "Attending" or "Declined" pre-filled.
Internal tools: Bug-report buttons in dashboards often use mailto with a pre-filled body template that includes placeholders for browser version, URL, and steps to reproduce.
Support pages: A "Contact Support" button pre-filled with the product name and an order number prompt reduces back-and-forth and gets you better first emails.
When to Use a Mailto Link vs. a Contact Form
Use a mailto link when: you want the simplest possible contact option with no backend; your audience is technical or professional and definitely has a configured email client; you're building a lightweight static site; or you're adding a secondary contact method alongside a form.
Use a contact form when: you need to collect structured data (name, company, project type); you want to prevent your email address from being scraped by spam bots; or you need server-side validation and confirmation emails.
The spam-scraping concern is real. Email harvesters crawl the web looking for mailto: links. If you're adding an email address to a high-traffic public page, consider JavaScript-rendered links or a contact form with a CAPTCHA. That said, the conversion benefit of a visible, clickable email often outweighs the spam risk for small sites — most modern spam filters handle harvested addresses well.
Best practice: offer both options. Let the user choose how they want to reach you.
Frequently Asked Questions
What is a mailto link?
A mailto link is an HTML hyperlink that, when clicked, opens the user's default email client with fields like To, Subject, CC, BCC, and Body already filled in. It uses the mailto: URI scheme instead of http://.
Does a mailto link work on all devices?
Yes, on most devices — as long as the user has a default email client configured. On mobile, it opens the native mail app. On desktop, it opens Outlook, Apple Mail, or the default client. If a user has no mail app set up, the link does nothing visible. Always include your email address as visible text alongside the link as a fallback.
Will adding my email in a mailto link get it scraped by bots?
Yes — email addresses in HTML source code are readable by crawlers. If spam is a concern, use a contact form, or build the link dynamically with JavaScript. Most modern spam filters handle harvested addresses well, and the conversion benefit often outweighs the risk for small sites.
Can I send to multiple recipients with one mailto link?
Yes. Separate multiple addresses with a comma in the to parameter: mailto:alice@example.com,bob@example.com. Use cc and bcc for copied recipients.
Can I pre-fill the subject and body?
Yes. Add ?subject=Your%20Subject&body=Your%20message after the email address. Spaces must be encoded as %20. Our mailto generator handles encoding automatically.
Does BCC work in all email clients?
BCC works in most major clients but not all. CC is more universally reliable. If BCC is critical for your use case, test across Gmail, Apple Mail, and Outlook before deploying.
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