Editly is a powerful video editing framework that lets you create videos entirely through code rather than traditional GUI-based editing. Built on Node.js and ffmpeg, it uses a declarative approach to video composition, making it ideal for developers who want to automate video production.

Whether you need a simple CLI for quick edits or a flexible JavaScript API for complex projects, Editly handles both. The tool excels at programmatically assembling videos from multiple sources—clips, images, audio tracks, and text overlays—with automatic transitions and effects applied seamlessly.

Key capabilities include:

Create videos entirely with code using JSON or JavaScript
Automatic scaling and letterboxing for any input or output dimensions
Smooth transitions between clips with customizable effects
Text and subtitle overlays with custom styling
Support for HTML5 Canvas and GL shader rendering for dynamic content
Audio mixing with automatic crossfading and ducking
GIF output support alongside standard video formats
Picture-in-picture, vignette, and B-roll functionality
Streaming-based processing for efficient memory usage

Perfect for: Creating slideshows, promotional videos, tutorials, news stories, podcast compilations, or resizing videos to specific dimensions and framerates. The tool automatically handles framerate conversion and aspect ratio adjustments, eliminating manual letterboxing work.