Effortless image optimization for your business
Resize, compress, and convert images in real-time using a simple URL-based API with global caching and next-gen formats.
Categories:
Flyimg.io provides on-the-fly image resizing, cropping, compression, and format conversion (AVIF, WebP, etc.) via a simple URL-based API, available as a free open-source self-hosted Docker application or a managed SaaS with global caching.
๐ Overview
Flyimg solves the common web performance issue of serving large, unoptimized images that slow down page loads, increase bandwidth costs, and hurt SEO. It dynamically fetches images from any remote source, processes them based on URL parameters, caches the results, and delivers them in the most efficient modern formats like AVIF or WebP.
It's built for web developers, DevOps teams, and businesses needing a flexible image optimization service without relying on expensive third-party SaaS like Cloudinary or Imgix. Self-host it for full control or use the managed flyimg.io service for hassle-free scaling.
The project was created to democratize high-quality image processing, offering a lightweight, efficient alternative that's easy to deploy and customize, empowering users to optimize images on their own terms.
โจ Key Features
- On-the-fly resizing (
w_*), cropping (c_*), compression (q_*), and format conversion (o_avif,o_webp, etc.) using ImageMagick - Intelligent caching system for instant delivery on repeat requests, reducing server load
- Auto-format negotiation via
Acceptheader (o_auto) for optimal browser support - Security: domain whitelisting, URL signatures to prevent unauthorized access
- Optional: face detection, upcoming JPEG XL support and more experimental features
๐ Tech Stack
- Backend: PHP, ImageMagick, Nginx, PHP-FPM
- Containerization: Docker, s6-overlay
- Caching: Filesystem-based
- Auth: Custom URL signatures
- Hosting: Self-hosted (Docker) or flyimg.io (global CDN)
๐ฅ Who Is This For?
This project is useful for:
- Developers who want to ___add dynamic image optimization to their apps without external services
- Teams looking for ___a self-hosted or managed Cloudinary alternative
- Indie makers building ___image-heavy websites or PWAs
๐ธ Screenshots / Demo
- Live demo: https://demo.flyimg.io
- GitHub: https://github.com/flyimg/flyimg
๐ฅ Project Status
- ๐ข Actively building
Last updated: 2026-02-07
โ FAQ
Is this project free?
Freemium โ Self-hosted open source is free. Hosted SaaS offers 30-day free trial, then custom pricing (contact sales). Cancel anytime.
Is the source code available?
Yes โ https://github.com/flyimg/flyimg
Can I contribute?
Yes โ Open issues or submit PRs on GitHub. Check CONTRIBUTING.md. Sponsor via Open Collective: https://opencollective.com/flyimg.
๐ฌ Contact & Links
- Website: https://flyimg.io
- GitHub: https://github.com/flyimg/flyimg
- Twitter/X: https://twitter.com/flyimg_
- Email: hello@flyimg.io
Built with โค๏ธ and kept warm on WarmIndex.
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