About Form.io

Form.io is a self-hosted enterprise form building and data management platform that enables developers to create complex forms with a drag-and-drop builder while automatically generating REST APIs. It supports offline mode, fillable PDF forms, conditional logic, validations, and workflow capabilities. Delivered as Docker containers, Form.io deploys into customer on-premise or private cloud environments with full data sovereignty.

Pros & Cons

Pros

Full self-hosting with complete data sovereignty
Automatic API generation from form definitions
Enterprise-grade security with field-level encryption
Supports offline mode for field workers
Highly customizable with embeddable form builder

Cons

Key Features

Drag-and-drop form builder

Automatic REST API generation

Offline mode support

Fillable PDF forms and

Fillable PDF forms and PDF export

Complex conditional logic and validations

Workflow and approval capabilities

Self-hosted Docker container deployment

Field-level encryption and audit logging

Pricing

Enterprise

Custom

Unlimited forms & resources
Self-hosted Docker containers
PDF server support
Advanced audit logging
Field-level encryption

Featured In

#3

7 Best Open-Source Form Builders for Developers (2026)

Best for enterprise development teams building complex form-driven business applications that need automatic API generation, offline support, and strict compliance capabilities.

Form.io