Feature · File Uploads
Add multipart/form-data and a file input. With Storage connected, splitforms stores the upload and links it from the notification email, dashboard, and webhook payload.
Your form posts to one splitforms endpoint — no server, API route, or SDK. splitforms is the backend.
Every submission is saved to a searchable dashboard and emailed to you — spam filtered before it lands.
No glue code, no third-party middleman — it ships as part of splitforms and works from your first submission.
Copy-paste ready
Replace YOUR_ACCESS_KEY with the key from your splitforms dashboard. No SDK to install, no build step — the same html you already write.
<!--
enctype="multipart/form-data" is REQUIRED for file uploads.
Without it, browsers silently strip files from the POST body.
Current limit: 5 files per submission, 5 MB per file.
Storage integration must be connected before files are retained.
-->
<form
action="https://splitforms.com/api/submit"
method="POST"
enctype="multipart/form-data"
>
<input type="hidden" name="access_key" value="YOUR_ACCESS_KEY" />
<input type="text" name="name" placeholder="Your name" required />
<input type="email" name="email" placeholder="Email" required />
<label>
Resume (PDF, DOCX, max 5 MB)
<input
type="file"
name="resume"
accept=".pdf,.doc,.docx,application/pdf"
required
/>
</label>
<label>
Portfolio screenshots (multiple allowed)
<input type="file" name="portfolio" accept="image/*" multiple />
</label>
<input type="checkbox" name="botcheck" style="display:none" tabindex="-1" />
<button type="submit">Apply</button>
</form>
<!--
React / fetch equivalent:
const fd = new FormData(formEl); // collects files too
fd.append("access_key", "YOUR_ACCESS_KEY");
const res = await fetch("https://splitforms.com/api/submit", {
method: "POST",
body: fd, // do NOT set Content-Type
});
// 413 Payload Too Large = file exceeded the current upload limit.
// 415 Unsupported Media Type = blocked extension (.exe, .js, etc.).
-->How to set it up
How file uploads flows through splitforms — what you do, what we do, and what lands in your inbox.
Add enctype="multipart/form-data" to the <form> tag. Without it, browsers silently strip files from the POST body — the form will submit but no attachment ever arrives. For React/SPA submissions via fetch, build a FormData object and pass it as the body; do NOT set Content-Type yourself, the browser sets the multipart boundary.
Use a normal <input type="file" name="resume">. Add the 'multiple' attribute for multi-select. Use the 'accept' attribute to filter by extension or MIME type (accept='.pdf,.docx,application/pdf,image/*'). For best UX, also wrap the input in a <label> so the click target is the visible button, not the small native control.
With Storage connected, uploaded files are saved privately and exposed through signed download links. Webhook payloads can include a 'files' array with stored-file metadata, so your own backend can copy the files into S3, R2, Google Drive, a CRM, or a ticketing tool if you need long-term storage.
How file uploads works
splitforms accepts file uploads in any HTML form — set the form's enctype to multipart/form-data, add an <input type='file'>, and you're done. The same submit endpoint handles the multipart request, so there is no client-side S3 signing flow or separate upload endpoint to maintain. Route the same submission to an email inbox or a webhook at the same time — nothing here is one-or-the-other.
What you get
Every reason below is the boring, reliable kind — the fundamentals of file uploads, built once and tested in production so you never have to.
How SplitForms works
Connect your form, collect every submission, and send data where it needs to go — without building backend infrastructure.
Point your form to your unique SplitForms endpoint. That's it.
We instantly capture and organize every submission in your inbox.
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Common questions
Add enctype='multipart/form-data' to your <form> and an <input type='file' name='resume'>. The browser submits the file as part of the multipart POST; splitforms reads it through the normal submit endpoint and stores it when the Storage integration is connected. The current limit is 5 files per submission, 5 MB per file.
Retained file uploads unlock on Pro ($5/month) and above when the Storage integration is connected in the dashboard. Text-only submissions continue to work without Storage. For uploads, plan around the current product limit: 5 files per submission at 5 MB each.
Two steps: (1) connect Storage in the splitforms dashboard; (2) on your <form> tag, set enctype='multipart/form-data' and add an <input type='file' name='whatever' accept='.pdf,.docx,image/*'>. The accept attribute filters the OS file picker but is not a security boundary. To allow multiple files in one input add the multiple attribute. To require a file, add required. Executables and script-like extensions are blocked server-side regardless of accept.
Yes. Build a FormData object from your form ref or manually append fields, append the access_key, and POST it: const fd = new FormData(formRef.current); fd.append('access_key', 'YOUR_ACCESS_KEY'); await fetch('https://splitforms.com/api/submit', { method: 'POST', body: fd }). Critical: do not set the Content-Type header yourself when sending FormData — the browser must set the multipart boundary.
When Storage is connected, files are stored privately and exposed through signed download URLs. The current signed-link window is 7 days. To pull files into your own storage permanently, subscribe a webhook, read the files array from the payload, and copy each stored-file URL or key into S3, R2, GCS, Google Drive, or your CRM.
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