What's the maximum file size?

10 MB per file on Free, Starter and Pro, 25 MB on Business. Plain multipart posts are limited to about 4.5 MB per request; use direct uploads for larger files.

Are uploaded files public?

No. They're stored privately and accessed via your dashboard or signed links that expire after 7 days.

How to create an HTML file upload form without a server

To upload files from a plain HTML form without a server, add enctype="multipart/form-data" and a file input, and set the form's action to a FormSubmit endpoint. FormSubmit stores each file privately, links it in your notification email and dashboard, and passes signed links to your integrations.

Basic upload form

upload.html

<form action="https://formsubmit.app/f/YOUR_FORM_ID" method="POST" enctype="multipart/form-data" class="fs-form">
  <div class="fs-field">
    <label for="fs-name" class="fs-label">Name</label>
    <input id="fs-name" type="text" name="name" required class="fs-input">
  </div>
  <div class="fs-field">
    <label for="fs-email" class="fs-label">Email</label>
    <input id="fs-email" type="email" name="email" required class="fs-input">
  </div>
  <div class="fs-field">
    <label for="fs-files" class="fs-label">Files</label>
    <input id="fs-files" type="file" name="files" multiple required class="fs-input">
  </div>
  <div class="fs-field">
    <label for="fs-note" class="fs-label">Note</label>
    <textarea id="fs-note" name="note" rows="5" class="fs-input"></textarea>
  </div>
  <!-- Honeypot: leave this hidden field empty to catch bots -->
  <input type="text" name="_gotcha" tabindex="-1" autocomplete="off" style="display:none">
  <!-- Optional: where to send people after submitting -->
  <!-- <input type="hidden" name="_redirect" value="https://yoursite.com/thanks"> -->
  <button type="submit" class="fs-button">Send</button>
</form>

<style>
  .fs-form { max-width: 32rem; margin: 0 auto; display: grid; gap: 1.1rem; font-family: system-ui, sans-serif; }
  .fs-field { display: grid; gap: 0.35rem; border: 0; padding: 0; margin: 0; }
  .fs-label { font-size: 0.875rem; font-weight: 600; color: #18181b; }
  .fs-input { width: 100%; box-sizing: border-box; border: 1px solid #d4d4d8; border-radius: 0.5rem; padding: 0.6rem 0.75rem; font: inherit; font-size: 0.9rem; }
  .fs-input:focus { outline: 2px solid #6366f155; border-color: #6366f1; }
  .fs-choice { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; }
  .fs-help { font-size: 0.75rem; color: #71717a; margin: 0; }
  .fs-button { background: #18181b; color: #fff; border: 0; border-radius: 0.5rem; padding: 0.7rem 1rem; font-weight: 600; cursor: pointer; }
  .fs-button:hover { background: #27272a; }
</style>

Key details:

enctype="multipart/form-data" is required — without it the browser only sends the file name.
Each file input needs a name. Add multiple to accept several files in one input.
accept=".pdf,image/*" filters the file picker (it's a hint, not a security control).

Limits

Plan	Per file	Total storage
Free	10 MB	100 MB
Starter	10 MB	250 MB
Pro	10 MB	1 GB
Business	25 MB	10 GB

Plain multipart submissions are capped at about 4.5 MB per request by our serverless infrastructure. For larger files, upload directly from the browser to storage and send a reference — see direct uploads.

A job application form

The job application template is a good starting point: name, email, phone, LinkedIn, position, resume upload and cover letter.

Where do the files go?

Your notification email lists each attachment as a link.
In the dashboard, open a submission to preview images and PDFs or download any file.
Webhooks, Slack, Discord, Airtable and Google Sheets receive signed links.

Files are private, count toward your storage quota, and are deleted with their submission (manually or via retention).