Get a free access key
Sign up free and build your form in the drag-drop dashboard, or just copy the HTML below. splitforms generates the access_key automatically — no card required.
Lead capture form API
Lead capture form API for any website.
Updated · plan facts checked against /pricing
POST your lead form to one endpoint and every submission is stored, spam-filtered, and emailed to your team — no backend to build. Free for up to 500 leads total.
- 500 free total
- No backend
- HTML or JSON
No lead form backend
The endpoint is the backend — no PHP, SMTP, or server route to build to receive your leads.
Spam-filtered leads
A honeypot, time-trap, and rate limits screen bots before a lead ever reaches your dashboard.
Instant lead email
Accepted leads are saved to the dashboard before owner notification email is attempted; delivery time and inbox placement depend on provider and recipient settings. Notifications are included on every plan.
Quick start
Your lead capture form, ready to paste.
Drop this into any page, point the action at the endpoint, and add your access key. That's the whole integration — no server, no build step.
<form action="https://splitforms.com/api/submit" method="POST">
<input type="hidden" name="access_key" value="YOUR_KEY">
<input type="hidden" name="subject" value="New Lead from Website">
<input type="text" name="name" placeholder="Full Name" required>
<input type="email" name="email" placeholder="Work Email" required>
<input type="text" name="company" placeholder="Company">
<select name="company_size">
<option value="">Company Size</option>
<option value="1-10">1-10</option>
<option value="11-50">11-50</option>
<option value="51-200">51-200</option>
<option value="200+">200+</option>
</select>
<textarea name="message" placeholder="What do you need?" required></textarea>
<input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">
<button type="submit">Get My Quote</button>
</form>Setup
How to connect a lead capture form to the API.
No server, no SMTP setup. These are the same six steps whether you paste the HTML form, build it in React or Next.js, or POST JSON from your own code.
Add the required hidden fields
access_key identifies which form a submission belongs to. An empty botcheck honeypot and a form_loaded_at timestamp power the spam filtering — leave botcheck blank and set form_loaded_at when the page loads.
Point the form at the endpoint
Set the HTML form's action to https://splitforms.com/api/submit with method POST — or POST a JSON body from your own code with the same fields. Multipart is supported for file uploads.
Send one real test lead
Submit it and confirm it lands in the dashboard and your inbox. Email notifications to the form owner are free on every plan, including Free.
Control what happens next
Use subject to customize the notification email's subject line, redirect to send the visitor to a thank-you page, and replyto so you can reply straight to the lead.
Route leads further
On paid plans (Pro at $5/mo and Annual), add a signed webhook or a native integration — Google Sheets, Notion, Airtable, Slack, Discord, Telegram, WhatsApp, or Mailchimp — so leads move without anyone checking the dashboard.
What the API does
What does a lead capture form API do?
A lead form only looks simple. The endpoint behind it has to receive the request, screen out spam, keep a copy, and get every lead to your team — reliably, on every submission. Need a specific lead type? See lead capture form templates for demo requests, waitlists, and lead magnets.
- Receive an HTML form action, a JSON fetch() call, or multipart file uploads — one endpoint, one access_key
- Filter bots with a honeypot, a form_loaded_at time-trap, per-form allowed-domains, and IP rate limiting
- Store every lead searchable in your dashboard, with CSV, XML, and PDF exports on paid plans
- Route each lead to your inbox on every plan, then a signed webhook or 1-click integration on paid plans
JSON API
Can you submit leads to the API as JSON?
Yes. Building the form yourself in React or Next.js, or capturing leads from a mobile app or backend job? POST a JSON body to the same endpoint instead of an HTML form — see the React form guide or the Next.js form guide.
- POST Content-Type: application/json from a SPA, mobile app, or serverless function
- Same endpoint and same access_key — multipart form-data is supported for file uploads
- Keep the empty botcheck honeypot and a form_loaded_at timestamp so spam filtering still runs
Destinations
Can you send every lead to your CRM?
On Pro ($5/mo) and above, each new lead flows into your CRM or team tools through a native one-click integration or a signed webhook. Slack, Google Sheets, and Mailchimp connect from the integrations dashboard; Salesforce, HubSpot, and Pipedrive connect through a signed webhook with an HMAC-SHA256 signature.
- Salesforce — create new leads automatically
- HubSpot — add contacts to your pipeline
- Slack — get instant lead notifications
- Google Sheets — append every lead as a new row
How SplitForms works
What happens after someone submits your form?
splitforms receives the submission, filters spam, saves it to your dashboard and emails you — then, on paid plans, sends it on to your webhooks and integrations. No backend infrastructure to build.
Add your endpoint
Point your form to your unique SplitForms endpoint. That's it.
Receive submissions
We instantly capture and organize every submission in your inbox.
Route anywhere
Send data to email, spreadsheets, CRMs, webhooks, and 7,000+ apps.
No credit card required. Set up in under 60 seconds.
Connect & automate
Where can submissions go besides email?
On paid plans, submissions can also go to Slack, Discord, Google Sheets, Notion, Airtable, Zapier or any signed webhook — and splitforms works on the platforms you build on, from WordPress and Shopify to Next.js. With Stripe connected, your forms can take payments too.
NewTake payments on your formsDeposits, bookings, order forms — submitters check out through Stripe and the money goes straight to your Stripe account. Included on every paid plan.See plans →FAQ
Lead capture form API questions.
View all FAQsWhat is a lead capture form API?
A lead capture form API replaces the backend you would otherwise build to receive form submissions. splitforms is that hosted endpoint — https://splitforms.com/api/submit — it stores each lead, filters spam, emails your team, and can forward the data on to a webhook or CRM tool.
How do I connect a lead capture form to the API?
Set the form's action (or a fetch call) to https://splitforms.com/api/submit with method POST, add a hidden access_key field with your form's key, and include an empty botcheck honeypot plus a form_loaded_at timestamp field. Submissions appear in your dashboard and inbox immediately.
Can I submit leads as JSON instead of an HTML form?
Yes. POST a JSON body with Content-Type: application/json to the same endpoint — useful for single-page apps, mobile apps, or a serverless function that collects a lead before forwarding it. Multipart form data is also supported, for example when a lead attaches a file.
Can I send leads to my CRM or other tools?
Yes. On paid plans (Pro at $5/mo and Annual), Google Sheets, Notion, Airtable, Slack, Discord, Telegram, WhatsApp, and Mailchimp connect with one click from the dashboard, and you can add a signed webhook that forwards each submission's JSON to Salesforce, HubSpot, Pipedrive, Zapier, Make, or n8n.
How much does a lead capture form API cost?
Free for up to 500 leads total, with unlimited forms, email notifications, and spam filtering included. Pro is $5/month for 5,000 leads a month plus CSV/XML/PDF exports, webhooks, an auto-responder, CC/BCC and priority support. Annual is $49/year for 15,000 leads a month.
What happens after a visitor submits the lead form?
By default splitforms returns a JSON success response. Add a hidden redirect field with a URL to send the visitor to a thank-you page instead, and a subject field to control the notification email's subject line.
Is the lead capture form API rate-limited?
Yes. Each form accepts up to 6 submissions per minute and 20 per 15 minutes, per IP address per form. Requests past that limit return HTTP 429.
What stops spam submissions from hitting the API?
An empty botcheck honeypot field, a form_loaded_at time-trap, server-side content heuristics, per-form allowed-domains with strict origin mode, and an optional reCAPTCHA v2 you can add with your own secret key.
Simple pricing
How much does splitforms cost?
Free gives you 500 submissions for $0 — no card, no time limit. Pro is $5/month for 5,000 submissions a month, and Annual is $49/year for 15,000 a month with every Pro feature.
Free
$0— 500 submissions
For side projects and indie devs.
- 500 free submissions
- Unlimited forms
- Email notifications included
- Smart spam filtering
- Submissions dashboard
- Redirect after submit
- MCP server included
Recommended
Pro
$5/ month
Billed monthly
Every paid feature, for agencies and growing products.
- 5,000 submissions / mo
- Unlimited forms
- Webhooks and integrations
- CC/BCC, auto-replies and routing
- File uploads with 500 MB storage
- Stripe payments on your forms
- 3 team seats
- Cancel anytime
Annual
$49/ year
About $4.08/mo, billed yearly
Every Pro feature with triple the volume — $0.27 per 1,000 at full use.
- 15,000 submissions / mo
- Unlimited forms
- Everything in Pro
- File uploads with 5 GB storage
- 3 team seats
- Priority email support
No credit card required on Free • Cancel anytime • Full pricing and FAQ