Convert images instantly with ImgTool.app. Free online image converter that works 100% locally in your browser. Convert JPG, PNG, GIF, WebP, HEIC, and to next-gen formats like AVIF without losing quality. Perfect for web optimization and format changes.
Drop, select, or paste an image to start.
All conversion happens in your browser—no uploads, ensuring privacy and speed.
Convert between JPG, PNG, WebP, AVIF, and more.
Adjust output quality for lossy formats like JPG, WebP, and AVIF.
Handle JPG, PNG, GIF, WebP, and HEIC inputs.
Support for efficient formats like AVIF for better compression.
Completely free online tool with no sign-up required.
ImgTool.app is a simple, free image converter tool that processes everything client-side for maximum privacy. Whether you're converting photos for web use, compatibility, or optimization, our online image converter helps you switch formats quickly without uploading your files.
Combine with our image resizer, cropper, or compressor for a full editing workflow. For bulk processing, try the bulk resizer. All tools run locally in your browser.
AVIF offers superior compression for web images. Use 80–90% quality for best results. Note: AVIF export requires a modern browser.
If you need the smallest web image with broad support, WebP is usually the safest modern option. JPG is still best for simple compatibility, email attachments, and older systems. PNG is better for screenshots, logos, transparent images, and graphics where crisp edges matter. AVIF can create very small files, but browser and workflow support varies, so test it before using it for a client site or upload system.
Because conversion runs locally, you can test a few formats quickly without handing private photos, product shots, screenshots, or draft artwork to a third-party server. For a full web workflow, resize first, crop if needed, convert to WebP or AVIF, then compress the final file before uploading it to your site.