Attachments

html.contact supports file uploads from normal HTML file inputs.

Form setup

Use enctype="multipart/form-data" when your form includes files. Keep the public hc_pub_ key in the form action.

<form
  action="https://html.contact/f/hc_pub_REPLACE"
  method="POST"
  enctype="multipart/form-data"
>
  <label for="email">Email</label>
  <input id="email" name="email" type="email" required>

  <label for="message">Message</label>
  <textarea id="message" name="message" required></textarea>

  <label for="attachment">Attachment</label>
  <input id="attachment" name="attachment" type="file">

  <button type="submit">Send</button>
</form>

Private files

Uploaded files are stored privately. Each submission includes attachment metadata such as filename, size, field name, and file type. The file input still needs a name attribute; the uploaded filename is stored with the submitted fields under that name.

Email notifications

Email notifications link to authenticated downloads instead of attaching raw files directly to outbound email.

Reviewing downloads

In the dashboard, open the submission, find Attachments, then use File to view or download the upload.

Treat every unknown upload like any other unknown attachment: download only when you expect the file, scan it with your security tools, and be cautious before opening documents, archives, or executables.

Limits

File limits are enforced before storage. Empty file inputs are ignored.

Current browser form support allows one non-empty attachment per submission, up to 4 MB.