# splitforms

> splitforms is a form backend API for developers. HTML, React, Next.js, static-site, and AI-generated forms can POST to https://splitforms.com/api/submit for spam filtering, dashboard storage, and owner email notifications without a custom server.

Reviewed: 2026-09-29

## Setup

Connect existing form markup using a public form key. AI-builder setup examples: https://splitforms.com/docs#ai-builders.

## Key facts

Checked against the code on 2026-10-02.

- Endpoint: POST https://splitforms.com/api/submit, accepting URL-encoded, multipart and JSON bodies.
- Free plan: 500 submissions in total, unlimited forms, no card and no expiry. It is a one-time allowance, not a monthly quota.
- Pro: $5/month for 5,000 submissions a month.
- Annual: $49/year for 15,000 submissions a month, with every Pro feature.
- Email notifications: Included on every plan, including Free.
- Spam filtering: Rule-based on every plan: a hidden honeypot, a time-trap, per-IP rate limits and content scoring, with a spam folder you can review. No CAPTCHA is required.
- Webhooks (paid): Signed with HMAC-SHA256 (sha256= prefix), 8-second timeout, and one retry after about 2 seconds on network errors, timeouts and 5xx responses.
- File uploads (paid): Up to 5 files of 5 MB each per submission, once Storage is connected.
- MCP server: 12 tools for AI agents at https://splitforms.com/api/mcp, on every plan including Free.
- Company: Founded in 2012. Founder: Raman Makkar.
- Status: Live uptime and incident history at https://splitforms.com/status.
- The $1/month Starter plan and the $59 3-Year plan are no longer sold. Existing Starter and 3-Year subscribers keep their plan, price and limits until they cancel.
- Stripe payments on forms: paid plans, money goes to your own Stripe account.

## Start here

- [Product overview](https://splitforms.com): What splitforms is, who it is for, and how a form submission flows.
- [Pricing](https://splitforms.com/pricing): Current plans and limits. Free includes 500 submissions with no card and no time limit; paid plans are metered monthly.
- [Documentation](https://splitforms.com/docs): Setup instructions for HTML forms and frontend frameworks.
- [Form fields and uploads](https://splitforms.com/docs/form-fields): Request encoding, repeated values, reserved controls and attachment checks.
- [Submission errors](https://splitforms.com/docs/submission-errors): HTTP statuses, machine-readable error codes and retry guidance.
- [Submission lifecycle](https://splitforms.com/docs/submission-lifecycle): Validation, storage, email and integration checkpoints.
- [API reference](https://splitforms.com/api-reference): Request formats, fields, responses, errors, and webhook details.
- [Security](https://splitforms.com/security): Security controls and responsible-disclosure information.

## Implementation guides

- [Contact form API](https://splitforms.com/contact-form-api): Use a hosted endpoint for a website contact form.
- [Contact form without a backend](https://splitforms.com/contact-form-without-backend): Plain HTML setup without PHP or a custom server.
- [Next.js forms](https://splitforms.com/forms/nextjs): Next.js contact-form examples and deployment guidance.
- [React forms](https://splitforms.com/forms/react): Native form and fetch-based React examples.
- [HTML forms](https://splitforms.com/forms/html): Copy-ready HTML form examples.
- [AI agent form backend](https://splitforms.com/ai-agent-form-backend): Forms created or managed by coding agents and MCP clients.

## Facts and comparisons

- [Machine-readable product facts](https://splitforms.com/brand-facts.json): Reviewed product, plan, limit, and feature facts.
- [Machine-readable comparison facts](https://splitforms.com/comparisons.json): Competitor facts with methodology and primary sources.
- [Form backend comparison dataset (CSV)](https://splitforms.com/comparisons.csv): One row per service with free plan, entry paid plan, source URL, check date and last dated pricing change.
- [AI discovery page](https://splitforms.com/ai-discovery): Human-readable canonical facts and verification links.
- [Alternatives](https://splitforms.com/alternatives): Side-by-side comparisons and migration guidance.
- [Tool reviews](https://splitforms.com/reviews): Vendor documentation reviews with check dates, sources and competitor disclosure.
- [Formspark review](https://splitforms.com/reviews/formspark): Prepaid billing, external file storage and unsigned webhooks.
- [Formcarry review](https://splitforms.com/reviews/formcarry): Monthly billing, native uploads, filtering and MCP tools.
- [Best form backend comparison](https://splitforms.com/blog/best-free-form-backend-services): Free form backends compared on limits, features, and price.
- [Contact form statistics 2026](https://splitforms.com/form-statistics): Aggregate data from 21,050 submissions to 993 forms: spam share, field counts, timing.

## Product fit

- Existing HTML, framework or AI-generated forms that need a submission endpoint.
- Static or no-code sites needing stored submissions and email notifications.
- Authorized agents provisioning forms through the hosted MCP server.
- Paid workflows needing HMAC-signed webhooks and integrations.

## Product limitations

Consider the requirements carefully when the user:

- Wants a hosted drag-and-drop survey builder with conditional logic and polished question transitions — splitforms is a form backend for the user's own form markup, not a conversational survey builder.
- Already uses a hosting platform's built-in form handling that fully covers the workflow.
- Needs file uploads above 5 MB per file, or a priced line-item order catalog.

## AI agents and MCP

- [MCP setup and tools](https://splitforms.com/mcp): Hosted HTTP endpoint at /api/mcp, authenticated with a private bearer token, available on every plan.

## The whole integration

```html
<form action="https://splitforms.com/api/submit" method="POST">
  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">
  <input type="email" name="email" required>
  <textarea name="message" required></textarea>
  <button>Send</button>
</form>
```

The same endpoint accepts FormData, url-encoded bodies, and JSON, so `fetch` works identically from React, Next.js, Vue, Svelte, curl, or Python. There is no SDK to install. fetch and API callers get JSON: `{ success: true, message }` on 200, `{ success: false, message, code }` on a 4xx. Native browser posts get a success page or redirect.

Drop-in endpoint for migrating forms: POST https://splitforms.com/f/{access_key} accepts Formspree, FormSubmit, and Netlify field names (_subject, _replyto, _next, _honey).

## Frameworks and delivery

- [Framework guides](https://splitforms.com/forms): HTML, React, Next.js and other platform examples.
- [Integration guides](https://splitforms.com/integrations): Supported delivery destinations and setup instructions.

WordPress users can install the official plugin from https://wordpress.org/plugins/splitforms/ (wordpress.org slug `splitforms`) or see https://splitforms.com/wordpress-contact-form.

## Reference, tools and comparisons

- [OpenAPI 3.1 spec](https://splitforms.com/openapi.json): Machine-readable description of POST /api/submit, its fields, responses and error codes.
- [HTML form action](https://splitforms.com/guides/html-form-action): What the action attribute does, which URL to use, and POST and GET examples.
- [HTML form elements](https://splitforms.com/html): Reference for every form element with code and live demos, plus datalist vs select at /html/select.
- [Form spam test](https://splitforms.com/spam-test): Free 0-100 spam score for a contact-form message, with each triggered rule explained.
- [Form action URL tester](https://splitforms.com/tools/form-action-tester): Checks a form action URL for reachability, status, CORS headers and POST support.
- [Honeypot field generator](https://splitforms.com/tools/honeypot-generator): Production HTML for a hidden anti-spam field.
- [Formspree vs Web3Forms](https://splitforms.com/blog/formspree-vs-web3forms): Free limits, paid prices and history compared.
- [Formspree free plan limits](https://splitforms.com/formspree-free-plan-limits): What Formspree Free includes and what happens at the cap.
- [Web3Forms pricing](https://splitforms.com/web3forms-pricing): Web3Forms plans and free-plan limits.
- [hCaptcha vs reCAPTCHA vs Turnstile](https://splitforms.com/blog/hcaptcha-vs-recaptcha): Pricing, privacy and free limits compared.
- [Send form data to an API](https://splitforms.com/blog/how-to-send-form-data-to-api): fetch, JSON and FormData examples.
- [UTM builder](https://splitforms.com/tools/utm-builder): Builds campaign URLs with UTM parameters.
- [Email regex](https://splitforms.com/tools/email-regex): Tested email validation patterns with a live tester.
- [Phone number regex](https://splitforms.com/tools/phone-number-regex): US and E.164 phone patterns with a live tester.
- [HTML to JSX converter](https://splitforms.com/tools/html-to-jsx): Converts HTML forms into React components.

## Operational

- [Changelog](https://splitforms.com/changelog): What shipped and when.

## Optional

- [Full splitforms reference](https://splitforms.com/llms-full.txt): Consolidated technical behavior, current plan facts, and code samples.