Saint Web Image
A free, fast image converter that runs entirely in your browser. No uploads, no accounts, no limits. Built for people who work with images on the web.
Most online image converters upload your files to a remote server, process them there, and send them back. That means your private photos and design assets pass through someone else's infrastructure, and you're often limited to a handful of free conversions before hitting a paywall.
Saint Web Image takes a different approach. Every conversion runs locally in your browser using modern Web APIs. Your images never leave your device. There are no upload limits, no watermarks, and no account required.
WebP, JPEG, PNG, AVIF, GIF, BMP, ICO
Quality slider from 10% to 100%
Presets for Instagram, YouTube, Pinterest, and more
Convert multiple images and download as ZIP
Saint Web Image was built by a web designer based in Portugal. The project is maintained independently and supported by advertising to keep it free for everyone.
If you have feedback, suggestions, or found a bug, please reach out through the Contact page.
The tool is built with React and TypeScript. Image processing uses the Canvas API and OffscreenCanvas via Web Workers, ensuring the interface stays responsive even during large batch conversions. HEIC/HEIF files (from iPhones) are converted using the heic2any library. SVG files are sanitized with DOMPurify before processing to prevent XSS attacks.