> ## Documentation Index
> Fetch the complete documentation index at: https://docs.opnform.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction to OpnForm

> An open-source form builder

OpnForm is an open-source form builder designed to empower developers and users alike. This technical documentation serves as your comprehensive guide to understanding, implementing, and contributing to OpnForm.

<Note>For end-user documentation, feature explanations, and usage guides, please refer to our [Help Center](https://help.opnform.com).</Note>

<Info>
  Self-hosted OpnForm can be used without an Enterprise license for core
  functionality. Free self-hosted instances include OIDC within a 2-user
  instance limit. Adding more users and advanced self-hosted features require
  license activation. See [Self-hosted
  License](/deployment/self-hosted-license).
</Info>

<CardGroup cols={2}>
  <Card title="Cloud Version" icon="cloud" href="https://opnform.com/?utm_source=docs&utm_medium=introduction&utm_campaign=cloud_version">
    Managed service with high availability and security.
  </Card>

  <Card title="Deploy" icon="server" href="/deployment">
    Self-host OpnForm for full control and customization.
  </Card>

  <Card title="Contribute" icon="code-branch" href="/contributing">
    Join our open-source community and contribute.
  </Card>

  <Card title="API Reference" icon="book" href="/api-reference">
    Integrate OpnForm with our comprehensive API.
  </Card>
</CardGroup>

## Features

* 🚀 No-code form builder with unlimited forms, fields & submissions
* 📝 Various input types: Text, Date, URL, Phone, Email, Checkboxes, Select, Multi-Select, Number, Star-ratings, File uploads & more
* 🌐 Embed anywhere (website, Notion page, etc.)
* 📧 Email notifications for form owners & respondents
* 🔒 Hidden fields and form passwords
* 🔗 URL form pre-fill
* 💬 Slack and Discord integrations
* 🪝 Webhooks
* 🧠 Form logic and AI-powered form generation
* 🎨 Customizable colors, images, and custom code
* 🛡️ Captcha form protection
* 📅 Form closing date
* 🔢 Limit on number of submissions
* 📊 Form analytics
* 📁 File uploads
* 🆔 Unique submission ID
* 📱 Single or multi-page forms
* 🔍 Form templates for inspiration
* 🔄 Editable submissions
* 🌐 Custom domain
* 🏷️ Remove OpnForm branding
* 🔔 Form confirmation emails
* ...[and more](https://opnform.com/pricing)!

<Note>
  The easiest way to get started with OpnForm is through our [official managed service in the Cloud](https://opnform.com/?utm_source=docs\&utm_medium=introduction\&utm_campaign=cloud_version). It takes just 1 minute to start building forms with the free plan, with high availability, backups, security, and maintenance all managed for you.
</Note>