Contact form for any HTML website

Paste the snippet above into your HTML file. Replace YOUR_ACCESS_KEY with the key from your splitforms dashboard. Submissions go to your inbox immediately. No JavaScript, no build step, no install.

Yes — every static host. The form posts to splitforms.com from the browser, so the host only serves the HTML. Lock the access key to your custom domain (or *.github.io / *.pages.dev) in the splitforms dashboard.

Splitforms returns a default error page on failures (invalid key, spam, rate-limit). You can customize that page in the splitforms dashboard → Settings → Error Page. For inline error handling, you'd need a small JS snippet — see the AJAX page.

Yes. Add enctype="multipart/form-data" to the form and use a normal <input type="file">. File uploads work after the account connects the Storage integration; the current limit is 5 files per submission at 5 MB each.

Set the URL in Dashboard → Form settings → Redirect. After a successful native form submission, splitforms sends the browser there. A redirect field submitted with the form is ignored to prevent open redirects. The /thanks.html page is yours — build it however you like.

Yes. The hidden honeypot field catches naive bots; a tuned classifier scores everything else and quarantines anything that looks automated. CAPTCHA hurts conversion (5-15% drop, depending on study) so we don't use one. If you ever need stricter protection, the Pro plan adds custom rules.

If you forget method="POST" (or omit it — GET is the HTML default), the browser appends form fields to the URL: ?name=Maya&email=…. Splitforms's endpoint returns 405 Method Not Allowed because it only accepts POST. Always specify the method explicitly.

If you accidentally name two fields email, FormData posts both — but the splitforms dashboard shows the last one. For checkbox groups, use name="interests[]" or unique names per checkbox.

Standard forms submit as application/x-www-form-urlencoded, which can't carry binary file data. If you add <input type="file">, also add enctype="multipart/form-data" to the form tag — otherwise the file silently doesn't upload.

style="display:none" is what splitforms uses, but some sophisticated bots ignore display:none. Stack defenses: display:none + tabindex="-1" + aria-hidden="true" + an off-screen label. Splitforms's classifier catches the rest.

Mixed-content errors: if your GitHub Pages site is served over HTTP (rare but possible on custom domains without HTTPS toggled), the browser blocks the POST to https://splitforms.com. Enforce HTTPS in your custom domain settings.

Browsers only treat a button as a submit trigger when it's a descendant of the form element. If your CSS layout requires the submit button to live outside the <form> (e.g. a sticky bar at the page bottom), the form will never submit on click — Enter inside an input still works. Fix it by adding form="contact-form" on the button, matching an id="contact-form" on the form. The HTML5 form-attribute association is widely supported but easy to forget.

Plain HTML has no built-in way to deliver a form submission anywhere — the spec only covers serializing fields and either GETting or POSTing them to whatever URL you put in action. Without a backend, the historical fallback is mailto: links (broken on Gmail, Outlook web, and most mobile devices) or PHP on shared hosts (extinct on S3, GitHub Pages, Cloudflare Pages, Netlify-static). That's the gap splitforms fills: you keep using the same <form action method=POST> HTML you already wrote, and the action points at our endpoint instead of a server you'd otherwise have to operate.

Plain HTML deploys to anywhere that serves files: GitHub Pages, S3 + CloudFront, Cloudflare Pages, Netlify, Vercel, plain Apache/nginx, even Dropbox public folders (RIP). The form posts cross-origin from the browser to splitforms.com, so the host is irrelevant to delivery — but enforce HTTPS on your domain, otherwise the browser blocks the mixed-content POST. On GitHub Pages, toggle 'Enforce HTTPS' under Settings → Pages. On S3, terminate TLS at CloudFront. Lock the splitforms access key to your custom domain in the dashboard so a leaked key from View Source is inert elsewhere.