NEWSLETTER SIGNUP · ASTRO

Newsletter Signup for Astro

Email-only newsletter capture — perfect for footers and landing pages. Free for 500 submissions per month — no backend, no SDK, no plugin.

Get free access key Copy the code

500/mo free·no card·drop-in for Astro

form.htmlhtml12 lines

01<form action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">
03  <input type="hidden" name="subject" value="New newsletter subscriber">
04 
05  <label for="email">Your email *</label>
06  <input id="email" type="email" name="email" placeholder="you@example.com" required>
07 
08  <!-- honeypot — bots fill every field -->
09  <input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">
10 
11  <button type="submit">Send</button>
12</form>

500

submissions / mo, free

fields, ready to ship

code outputs

60s

from copy to inbox

§ 00Astro + Newsletter Signupplatform-specific integration guide

Why Astro developers choose splitforms for newsletter signup

Astro's static-first architecture means your form HTML ships pre-rendered with zero client JavaScript — perfect for fast page loads, but it also means you can't call a server-side endpoint on static hosts. splitforms is designed for exactly this: the browser POSTs directly to our edge endpoint, so the form works on Netlify, Cloudflare Pages, Vercel, or any static host without an Astro API route. The newsletter signup is pure HTML — no <code><script></code> tag, no client component, no island. Astro's view transitions and partial hydration don't interfere with the form submission because it uses a standard browser POST.

§ 00Quick answerHTML · marketing

Yes — this is the shortest safe path for Astro.

Use the HTML snippet on this page, keep the newsletter signup fields visible in your Astro UI, and let splitforms handle delivery, spam filtering, storage, and webhooks.

best implementation

Paste the HTML version, then replace YOUR_ACCESS_KEY.

The posted payload contains your email. Required fields are your email.

native astro reality

Astro's whole pitch is shipping zero JavaScript by default.

use case fit

Email lists still convert 5-10x social. The newsletter signup form is the single most leveraged piece of your site — pop it up smartly, not annoyingly, and it pays compound interest.

§ 01Newsletter Signup × Astrowhy this combination, in 80 words

Built for Astro developers who hate operating a backend.

Splitforms is the form backend for Astro sites. One POST endpoint, no SDK, no plugin — drop the newsletter signup into a page and ship.

Splitforms is the form backend for Astro sites. One POST endpoint, spam filtering, and a real dashboard — drop-in, no server, no PHP. Free for 500 dashboard submissions per month; Starter adds email, signed webhooks, exports, and retained uploads; Pro is $5/mo for 5,000.

✦ what you get on the free plan

✓500 form submissions per month
✓2 forms on Free; unlimited forms on Pro
✓Spam protection (honeypot + classifier)
✓Webhooks: Slack, Discord, WhatsApp, custom
✓CSV export of all submissions
✓Email notifications (CC and BCC on Pro)

§ 02Copy-paste codeHTML · 12 lines

Drop into any Astro project.

Replace YOUR_ACCESS_KEY with your splitforms key, paste into a Astro page, and ship. No build-time integration required.

form.htmlhtml12 lines

01<form action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">
03  <input type="hidden" name="subject" value="New newsletter subscriber">
04 
05  <label for="email">Your email *</label>
06  <input id="email" type="email" name="email" placeholder="you@example.com" required>
07 
08  <!-- honeypot — bots fill every field -->
09  <input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">
10 
11  <button type="submit">Send</button>
12</form>

§ 03Setup3 steps · 60 seconds · zero config

Generate, embed, receive.

Three actions stand between you and your first newsletter signup submission. None of them require a backend, a database, or a CAPTCHA library.

STEP 01GENERATE

Generate a free splitforms key

Create your form

key=sk_live_••••••••

STEP 02EMBED

Paste the newsletter signup into your Astro project

Drop the form snippet into a Astro page, component, or layout. Replace YOUR_ACCESS_KEY with the key from your dashboard. The form action is a hard-coded URL — no env vars or build-time wiring needed.

snippethtml

<form action="https://splitforms.com/api/submit" method="POST">
  …
</form>

STEP 03RECEIVE

Receive submissions

Dashboard updates live on Free. Starter adds email delivery, signed webhooks, CSV export, Slack/Discord forwarding, and BCC to your team.

inbox · 1 newjust now

FROM contact@yoursite.com

New newsletter subscriber

Maya Iyer maya@studio71.co

Loved the demo — quick question about pricing on the 3-year plan. Are usage limits per project or account-wide?

§ 03bNewsletter Signup Form (Email Capture)template-specific playbook

The reason this newsletter signup exists.

Webhooks into ConvertKit / Mailchimp / Substack / Beehiiv / Buttondown.

why it matters

Newsletter conversion benchmarks haven't moved much: ConvertKit / Substack landing pages convert at 1-2% of visitors, popup forms at 2-4%, content-upgrade lead magnets at 8-15%. The form itself is trivially simple (email field, optional name) but where it lives matters — exit-intent popup, scroll-triggered slide-in, footer inline, content-end inline all behave differently. Push the submission to your ESP (Mailchimp / ConvertKit / Substack / Beehiiv / Buttondown) via webhook so the welcome email fires automatically. GDPR / CASL require explicit consent — a checkbox or unbundled-consent text under the form covers it for EU and Canadian visitors.

route the submission

Pick the form placement

Popup (highest volume, also highest annoyance — set scroll or exit-intent triggers), inline footer (low volume, low friction), content-end inline (best conversion-quality combo).

Push to your ESP

Webhook the email to ConvertKit / Mailchimp / Substack / Beehiiv / Buttondown. Each has either a native webhook receiver or a Zapier connector. Welcome email fires automatically on add.

Add GDPR / CASL consent

EU visitors need explicit consent — add a 'I want to receive emails from [your brand]' checkbox or unbundled-consent text under the email field. Required text varies by jurisdiction; consult your privacy lawyer if in doubt.

§ 03cAstro production notesnative path · deploy · gotchas

What changes when this newsletter signup lives in Astro.

These notes come from the Astro platform registry and are rendered on this template page so crawlers see the framework-specific answer without opening a separate guide.

without splitforms

Astro's whole pitch is shipping zero JavaScript by default. A native contact form on Astro means either (a) building a form with no submission target — useless — or (b) standing up an API endpoint via output: 'server' or 'hybrid', which means writing a Node/Bun/Deno handler, picking an email provider, writing your own honeypot logic. Astro 5 added typed Actions, but they're a wrapper around the same underlying fetch — you still deliver the email yourself. The result: every Astro contact-form tutorial ends with 'now configure SendGrid'. Splitforms is the SendGrid-replacement that doesn't require an account, an API key for the email provider, or DNS records for SPF/DKIM.

deploy notes

Astro deploys cleanly to Vercel, Netlify, Cloudflare Pages, GitHub Pages, and any static host with output: 'static'. For Astro Actions (Pattern B), you need output: 'server' or 'hybrid' and a matching adapter (@astrojs/vercel, @astrojs/netlify, @astrojs/cloudflare). On Cloudflare Pages with the Cloudflare adapter, the Action runs in a Worker — keep the splitforms fetch tight (no extra proxying) to stay under the 10ms CPU budget on the free plan. The PUBLIC_ prefix is mandatory for env vars exposed to client-rendered .astro files; vars without it are silently undefined. Lock the key to your *.pages.dev and custom domain.

Astro gotcha

PUBLIC_ prefix is required for client-exposed env vars

Astro mirrors Vite's env-var convention: only variables prefixed with PUBLIC_ are exposed to client-side code (and to .astro files when output: 'static'). If you write import.meta.env.SPLITFORMS_KEY, you'll get undefined at build time. Rename to PUBLIC_SPLITFORMS_KEY.

Astro gotcha

client:load on the form island defeats the point of Astro

If you wrap the form in <MyForm client:load />, you ship a full React/Preact runtime just for one form. Use client:visible (load when scrolled into view) or client:idle (load after main thread is free) instead. For zero-JS forms, skip the island entirely and use a plain HTML form action.

Astro gotcha

Astro Actions need a try/catch or they crash the page

If your action throws, Astro 5's behavior is to render an error page rather than return the error to your form. Wrap the splitforms fetch in try/catch and return { success: false, message } from the action — your form component can then render the message.

Astro gotcha

View Transitions can break form re-submit state

If you've enabled <ViewTransitions /> in your layout, navigating to /contact and back may re-mount the form mid-submission. Add data-astro-reload to the form's submit anchor or guard with if (status === 'loading') return at the top of your handler.

PATTERN A

Pattern A — pure HTML form (zero JS shipped)

The Astro-native approach: a .astro file with frontmatter pulling the key from import.meta.env, then a static <form action> that posts directly. Zero hydration, zero island, zero KB JavaScript. Use the same wiring for the newsletter signup fields on this page.

pattern-a.txtastro10 lines

01---
02const ACCESS_KEY = import.meta.env.PUBLIC_SPLITFORMS_KEY;
03---
04<form action="https://splitforms.com/api/submit" method="POST">
05  <input type="hidden" name="access_key" value={ACCESS_KEY} />
06  <input type="hidden" name="redirect"   value="/thanks" />
07  <input name="email" type="email" required />
08  <textarea name="message" required />
09  <button type="submit">Send</button>
10</form>

PATTERN B

Pattern B — Astro Action for typed server-side proxying

Astro 5 Actions give you Zod-validated, type-safe form handlers. Use one to keep the access key off the client entirely — the form posts to the action, the action proxies to splitforms. Use the same wiring for the newsletter signup fields on this page.

pattern-b.txtastro17 lines

01// src/actions/index.ts
02import { defineAction } from "astro:actions";
03import { z } from "astro:schema";
04export const server = {
05  contact: defineAction({
06    accept: "form",
07    input: z.object({ email: z.string().email(), message: z.string() }),
08    async handler(input) {
09      const fd = new FormData();
10      Object.entries(input).forEach(([k, v]) => fd.append(k, v));
11      fd.append("access_key", import.meta.env.SPLITFORMS_KEY);
12      const r = await fetch("https://splitforms.com/api/submit", { method: "POST", body: fd });
13      if (!(await r.json()).success) throw new Error("Submission failed");
14      return { ok: true };
15    },
16  }),
17};

§ 04Field-by-field rundown1 fields · names you POST

What every field actually does.

Each field below ships in the newsletter signup template — rename, remove, or add your own. Splitforms accepts any name you POST.

emailREQUIRED

Your email

Reply-to address — splitforms wires this so hitting reply goes back to the sender.

placeholder · you@example.com

§ 05Newsletter Signup on other frameworks21 frameworks · same backend

One backend. Every framework.

The same newsletter signup template works on every framework splitforms supports. Pick yours.

§ 06Questions9 answered

Newsletter Signup on Astro — FAQ.

Direct answers, no marketing fluff. Missing one? Email hello@splitforms.com.

01Does this newsletter signup work on Astro?

Yes. The form is plain HTML with a single POST endpoint, so it runs on any Astro site without server-side code, plugins, or SDKs. Drop the snippet into a Astro page or component and submissions land in your splitforms dashboard.

02How much does the newsletter signup cost on Astro?

Free for 500 submissions per month — no credit card, no trial. Pro is $5/mo for 5,000 submissions, and there's a one-time $59 3-year plan (15,000 submissions/mo for 36 months). The same pricing applies regardless of which framework hosts the form.

03Can I customize the fields?

Yes. The template ships with sensible defaults (your email…) — add, remove, or rename any of them. Splitforms accepts whatever fields you POST.

04How does spam protection work on the newsletter signup?

A hidden honeypot field catches dumb bots, and a tuned classifier scores the rest. You only see real submissions in your dashboard. No CAPTCHA, no friction for human users — and it works the same on Astro as on any other framework.

05Can I send the newsletter signup submissions to Slack or Discord?

Yes. Webhooks are available on Starter and above, with auto-formatted payloads for Slack, Discord, and WhatsApp (via CallMeBot). Or send raw signed JSON to any URL — Zapier, n8n, your own server. Configure in the splitforms dashboard.

06Will it work on a static Astro site?

Yes — the form posts directly to splitforms from the browser, so no server is involved. Works on Vercel, Netlify, GitHub Pages, Cloudflare Pages, S3, or any plain Apache host.

07Will my form trigger GDPR consent requirements?

If you have any EU or UK visitors, yes — GDPR requires explicit, freely-given consent for marketing emails. Add a separate consent checkbox (not pre-checked) below the email field. Same applies to CASL in Canada and PECR in the UK. US-only audiences fall under CAN-SPAM, which is less strict but still requires honest unsubscribe handling.

08How do I push to ConvertKit / Mailchimp / Substack / Beehiiv?

Webhook the submission as JSON. ConvertKit has a native webhook receiver per form; Mailchimp accepts via API or Zapier; Substack accepts via Beehiiv/Substack import API or Zapier; Beehiiv has direct webhook support. The newsletter platform fires the welcome sequence automatically on add.

09Does double opt-in hurt list growth?

Double opt-in drops list size by 20-30% but improves deliverability and engagement metrics — single-opt-in lists accumulate spam-trap addresses that tank inbox placement. Most serious senders run double opt-in for that reason. Substack and Beehiiv default to it.

§ 07Comparisonvs Web3Forms · vs Formspree

splitforms vs everything else.

Same drop-in API. More free submissions, Starter signed webhooks, MCP support no other backend has.

Feature	Web3Forms	Formspree	splitforms
Free monthly submissions	250	50	500
Custom fields beyond contact	Yes	Pro tier	Free
Webhooks (Slack / Discord)	Pro tier	Pro tier	Free, signed
AI / MCP submission inbox	No	No	Yes
Long-term plan (3-year flat)	—	—	$59 every 3 years

§ 08More templates for Astro5 adjacent patterns

Ship a newsletter signup on Astro in 60 seconds.

500 submissions per month, free forever. No credit card. Copy the snippet above and paste it into your Astro project.

Get free access key →Read the docs

founders pricing locked in · early access open

Newsletter Signup for Astro

Why Astro developers choose splitforms for newsletter signup

Yes — this is the shortest safe path for Astro.

Paste the HTML version, then replace YOUR_ACCESS_KEY.

Built for Astro developers who hate operating a backend.

Drop into any Astro project.

Generate, embed, receive.

Generate a free splitforms key

Paste the newsletter signup into your Astro project

Receive submissions

The reason this newsletter signup exists.

Pick the form placement

Push to your ESP

Add GDPR / CASL consent

What changes when this newsletter signup lives in Astro.

PUBLIC_ prefix is required for client-exposed env vars

client:load on the form island defeats the point of Astro

Astro Actions need a try/catch or they crash the page

View Transitions can break form re-submit state

Pattern A — pure HTML form (zero JS shipped)

Pattern B — Astro Action for typed server-side proxying

What every field actually does.

Your email

One backend. Every framework.

Newsletter Signup on Astro — FAQ.

splitforms vs everything else.

Other ready-to-ship Astro forms.

Ship a newsletter signup on Astro in 60 seconds.