Resend Pad

A minimal email utility to send emails using your Resend API key.

Send emails from your browser. No code, no accounts, no storage.

Quick Start

Online (Railway Deployment)

Landing Page:  https://resendpad.up.railway.app/landing.html
Email Editor:  https://resendpad.up.railway.app/index.html

Local Development

node api-proxy.js
# Landing page: http://localhost:3001/landing.html
# Email editor: http://localhost:3001/index.html

How It Works

1. Paste your API key into the form (stored only in browser memory)
2. Load your verified domains from Resend with "Load Domains" button (or enter From email manually)
3. Add recipients – comma-separated To/CC/BCC with live validation
4. Compose your email using the rich text editor with formatting toolbar
5. Attach files if needed – multiple files supported
6. Click Send – your email is delivered via Resend immediately
7. Check Sent tab – browse sent emails, see delivery status, click any row to read the full email body

Features

• Rich Text Editor: Format emails with bold, italic, underline, headings, lists, links, code blocks via Quill.js
• File Attachments: Attach multiple files to your emails. Files are base64-encoded client-side and sent via Resend's API. Never touch our server.
• Multiple Recipients: Send to multiple To/CC/BCC addresses using comma-separated emails with inline validation
• Sent Inbox: Browse all sent emails with delivery status (delivered, bounced, opened, clicked). Click any row to read the full email body.
• Domain Loader: Fetch verified sender domains directly from your Resend account with one click
• Reply Threading: Paste email headers from Gmail's "Show original", or a Resend email JSON response, to link replies to existing conversation threads (Gmail, Outlook, Apple Mail, Thunderbird compatible)
• Mobile Friendly: Works on desktop, tablet, and mobile browsers
• No Account Required: BYOK (Bring Your Own Key) – just paste your Resend API key

Reply Threading

1. Open the original email in Gmail → Show original
2. Copy all text (Ctrl+A / Cmd+A)
3. In Resend Pad, click Connect Thread and paste raw email headers (Gmail's "Show original") or the JSON from Resend's GET /emails/:id response
4. Form auto-fills To, Subject (with Re:), and threading headers (Message-ID, References)
5. Type your reply and send – appears in the same conversation thread

Security & Privacy

• Your API key never leaves your control – sent directly to Resend's API in the Authorization header. Never stored, logged, or persisted on our servers.
• No email content is logged – email subject and body are forwarded to Resend and discarded. No database, no history, no backups.
• No user accounts or tracking – no sign-up, no login, no email collection, no analytics, no cookies.
• Transparent & auditable – full source code on GitHub. Self-host if you want complete control.
• Stateless design – the proxy doesn't store anything. Restart the server and everything is cleared.

API Key Safety:

• Your key is sent in HTTP headers only
• Never logged to disk in production
• Lost when container restarts (no persistence)
• You can rotate keys anytime in Resend dashboard

How the Proxy Works

Browser                    Your Server (api-proxy.js)       Resend API
  │                              │                              │
  ├─ POST /api/send ────────────>│                              │
  │  (with Bearer token)         ├─ POST /emails ──────────────>│
  │                              │  (with your API key)         │
  │                              │<─ 200 OK ────────────────────┤
  │<─ 200 OK ─────────────────────┤                              │
  │                              │                              │

Why a proxy?

• Resend API doesn't support CORS from browsers
• Proxy handles CORS transparently
• API key is passed through, never stored or logged

Requirements

• A modern web browser (Chrome, Firefox, Safari, Edge)
• A Resend account with an API key (resend.com/api-keys)
• At least one verified domain in Resend

Note: "Sending Only" keys cannot list domains, but can send emails if you manually enter the From address.

Deployment

Railway (Recommended)

railway up

Railway runs node api-proxy.js on the default PORT, serves static files, proxies API calls through /api/*.

Deploy to Railway – both of us get $5 credit.

Self-Hosted

git clone https://github.com/rozetyp/resend-email.git
cd resend-email
node api-proxy.js

Works on Vercel, Netlify, or any Node.js server. Auto-detects environment.

Technical Stack

Frontend: HTML5 + Vanilla JavaScript (no frameworks), Tailwind CSS (CDN), Quill.js rich text editor

Backend: Node.js + native HTTP server, proxies to Resend API, serves static files, handles CORS

License

Open source. Use freely.

Support

• Open an issue on GitHub
• Check the source code in index.html and api-proxy.js