Free Online Image Converter
Convert between JPG, PNG, WebP, and AVIF formats in batch mode. 100% client-side — your images never leave your browser.
ToolMatic's Image Converter is a 100% client-side format conversion utility that transforms JPG, PNG, WebP, AVIF, and HEIC files into modern web-optimized extensions directly in your browser. Batch convert up to 50 images at once, adjust lossy quality, and download individual files or a unified ZIP archive with zero cloud uploads.
How to Convert Image Formats Online for Free
Different image formats serve distinct purposes on the web. Converting graphics to modern extensions like WebP or AVIF reduces page weight by up to 35% compared to legacy JPEG, while converting complex diagrams to PNG ensures lossless sharpness and transparency.
Drag and drop up to 50 images into the converter box. Supports JPG, PNG, WebP, AVIF, and HEIC files.
Choose WebP for fast website performance, JPG for universal compatibility, PNG for transparency, or AVIF for next-gen compression.
Inspect before/after file sizes and download your converted graphics instantly without waiting for cloud queues.
Format Guide: When to Convert to Each Format
| Target Format | Ideal Use Case | Transparency Support | Key Advantage |
|---|---|---|---|
| WebP | Websites, blog articles, social media | Yes (Alpha) | 25%–35% smaller than JPG; supported by 98%+ of browsers. |
| JPEG / JPG | Printing, legacy software, photo archives | No | 100% universal hardware and software compatibility. |
| PNG | Logos, UI icons, graphic mockups | Yes (Lossless) | Pixel-perfect sharpness without compression artifacts. |
| AVIF | Modern high-traffic web applications | Yes (Alpha & HDR) | Highest compression ratio; up to 50% lighter than JPG. |
Looking to Compress File Sizes?
Reduce image sizes by up to 90% with target size controls and resize presets using our Image Compressor.
- Converting photographic PNGs to WebP or JPG reduces file size by 70% to 85% with zero noticeable quality change.
- When converting transparent PNGs to JPG, transparent areas are automatically filled with clean white backgrounds.
- All conversion runs locally on your machine via HTML5 Canvas — your private files are never stored or seen by anyone.
Frequently Asked Questions (FAQ)
How do I convert JPG images to WebP online?
To convert JPG to WebP, drag and drop your JPG files into ToolMatic's Image Converter, click the 'WebP' format pill, and download your converted files individually or as a complete ZIP archive. The conversion completes in milliseconds directly in your browser.
What happens to transparent backgrounds when converting PNG to JPG?
Because the JPEG standard does not support alpha transparency channels, any transparent pixels in your source PNG image will be automatically filled with a solid white background during conversion.
Can I convert multiple images at the same time?
Yes. ToolMatic supports batch conversion for up to 50 images simultaneously. All selected files are converted in parallel and can be downloaded together in a single ZIP file.
Are my files uploaded to a remote server during conversion?
No. All format decoding and encoding execute 100% locally on your computer or phone using the browser's Canvas API. No image data is ever uploaded to any external server.
Which format should I convert my website images to?
Convert your website images to WebP. WebP offers 25% to 35% smaller file sizes than standard JPEG at identical perceived quality, supports transparent backgrounds, and is natively supported by over 98% of web browsers.