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Mailto Link Validator

Check a mailto: link and every address and field in it.

Email Validator Tools Reviews Free · no sign-up

Quick Tool Overview

The Mailto Link Validator pulls a mailto: URL apart: every to, cc and bcc address is validated, the subject and body are decoded, and anything needing percent-encoding comes back fixed.

What it does
Validates a mailto: link and every address and field in it
You give it
A mailto: URL
You get back
Per-field results and a corrected, encoded link
Common fix
Percent-encoding a subject or body that truncates
Best for
Debugging a "contact us" link that half works
Email Validator Tools Free, unlimited use No sign-up Runs in your browser

About the Mailto Link Validator

A mailto: link that half works is a familiar problem: the address opens fine but the subject line arrives truncated at the first space, or the body loses every line break. Both come from the same cause, which is that a mailto: URL has to be percent-encoded and usually is not.

Paste the link and this pulls it apart: every address in the to, cc and bcc fields is validated individually, the subject and body are decoded and checked for the characters that need escaping, and unknown fields are flagged. Anything that needs encoding is shown with the corrected link beside it, ready to copy.

It also catches the structural mistakes — a missing colon, a stray slash borrowed from http://, addresses separated by a semicolon where the specification wants a comma.

Key features of the Mailto Link Validator

Every recipient checked

To, cc and bcc addresses validated individually.

Encoding problems fixed

The corrected link is built for you, ready to copy.

Fields decoded

See the subject and body as the mail client will receive them.

Portability warnings

Semicolon separators and raw line breaks are flagged.

No network call

The link is parsed in your browser, never opened or sent.

How to use the Mailto Link Validator

  1. 1

    Paste the mailto: link

    The whole thing, including any subject and body parameters.

  2. 2

    Check the recipients

    Every to, cc and bcc address is validated on its own.

  3. 3

    Read the field breakdown

    Subject and body are decoded so you can see what arrives.

  4. 4

    Copy the corrected link

    Anything that needed encoding is fixed for you.

Frequently asked questions

Because it is not percent-encoded. A raw space or ampersand ends the parameter early, so the subject truncates at the first one. Encoding the value fixes it, and this tool shows the encoded link.

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