Edge-native spam prevention and form backend

Stop spam. Build forms. No backend code required.

Start free with our copy-paste pixel, or create secure hosted forms without writing any backend code. SpamBlock identifies spam using 13+ detection signals including language analysis, behavioral tracking, and advanced Unicode detection. Every submission is scored at the edge in real time so your users never feel the friction.

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Edge scoring: Real-time
Spam blocked automatically: 92%
Disposable domains tracked: 130k+
Global edge locations: 285+

Add the SpamBlock Pixel

Paste one script, optionally tune advanced controls. No API keys or captchas required.

<script 
    src="https://pixel.spamblock.io/latest.js" defer
></script>

<form action="https://api.spamblock.io/f/{form_id}" method="POST" >
  ... form fields ...
  <button type="submit">Send</button>
</form>

Choose Your Path

Whether you have existing forms or want to build new ones, we have a solution for you.

Protect Existing Forms

For projects that already have forms

✓One script tag, works immediately
✓Free forever, 1000 checks/day
✓No account required
✓No analytics, no hosted forms

Get the Pixel →

Build Secure Forms Fast

For teams building new forms

✓No backend code needed
✓Secure, customizable forms
✓Analytics dashboard included
✓Free tier: 100 submissions/month

Start Building Forms →

Why teams choose SpamBlock

Our edge worker scores every submission in real time using 13+ detection signals: language analysis, entropy detection, behavioral tracking, script analysis, and more. No captchas, no user friction, and analytics you can export.

Protect existing forms: Drop in one script and protect all your existing forms. Detection covers language mismatch, entropy analysis, behavioral tracking, script signals, and homoglyphs. Honeypots are injected automatically.
Build secure forms fast: Create hosted forms without backend code. Keep your existing actions and integrations while SpamBlock intercepts submissions and only lets clean traffic through.
Scale with your team: Surface scoring in your logs, monitor false positives, and automate follow-up workflows. Paid plans add advanced analytics and team collaboration.

Launch in minutes—no code rewrite required.

Protect existing forms with our pixel, or build new secure forms without backend code.

Get the Pixel Start Building Forms