Best Free Online Image Converters in 2026 — WebP, AVIF, HEIC and more

If you work with web images, you're converting between formats constantly. Here are 6 free tools worth knowing. 1. Convertify Convertify supports WebP, HEIC, AVIF, PNG, JPG, TIFF and 20+ other formats. Built with Rust + libvips. Batch conversion up to 10 files, no signup, no watermarks, files deleted within 6 hours. Pros: Fast, no account required, 20+ formats, quality control slider, batch conversion Cons: 20MB per file limit, no editing features 2. Squoosh Google's open-source tool. Runs entirely in the browser via WebAssembly. Excellent for fine-tuning compression — side-by-side preview and full control over encoding parameters. Pros: In-browser, open source, excellent compression control, supports AVIF Cons: Single file only, no batch conversion 3. Cloudinary The industry standard for production image pipelines. Free tier gives you 25GB storage and on-the-fly format conversion via URL parameters. Pros: API access, CDN delivery, automatic format negotiation Cons: Requires account, o