Use this page when you are deciding between JPG, PNG, WebP, or AVIF. If you already know the target format and just need batch conversion, open the Image Converter.
Drop JPG images here or click to upload
Batch convert | Max 50MB each | Up to 20 files
Images are converted entirely in your browser. Nothing is uploaded to any server.
Convert PNG to JPG to reduce file size, or JPG to PNG for transparency support.
Convert multiple images at once. Download all as a ZIP file.
See original and converted file sizes side by side.
Need to actually convert across more formats? Use Image Converter. Need smaller files after picking a format? Use Image Compressor. Want the whole cluster? Open the Image Tools hub.
Convert image formats online free with FreeToolBox — quickly change PNG to JPG, JPG to PNG, WebP to JPG, or any combination in your browser. JPG is best for photos with smaller file sizes; PNG supports transparency and lossless compression; WebP offers excellent quality with smaller files; AVIF provides even better compression for modern browsers. Choosing the right format can significantly improve website performance or reduce storage.
The conversion runs entirely in your browser using the HTML5 Canvas API — no image is ever sent to a server. Convert multiple images in one session, adjust output quality for lossy formats, and download all results at once. Completely free, no watermarks, no account required.
Use PNG for logos, icons, and images needing a transparent background — PNG is lossless. Use JPG for photographs where file size matters more than precision; JPG achieves much smaller files but doesn't support transparency.
Yes. JPG doesn't support transparency, so transparent areas are filled with white (or your chosen background color). If you need transparency, save as PNG or WebP instead.
WebP is supported by all modern browsers (Chrome, Firefox, Safari 14+, Edge). For any modern website, WebP is recommended for its superior compression.
No. All conversions happen locally in your browser using the Canvas API. Your images never leave your device.
Each image format makes a different set of trade-offs between file size, quality, and feature support, so the right choice depends on what the image will be used for. A photograph with many colors benefits from a lossy format that can discard detail cheaply. A screenshot or a logo with sharp edges and flat colors often does better in a format that preserves those edges. There is no universal winner — the format that is best for a photo is often a poor choice for a diagram, which is why this site offers multiple formats for different jobs.
The key decision is whether you can afford to lose some image data. Lossy formats discard information to make files smaller, which is ideal for photos where the loss is often imperceptible. Lossless formats keep every detail but produce larger files, which is better for text, line art, or anything where an artifact would be visible. The trap is applying a lossy format to content where the artifacts show — flat-color graphics and text can visibly degrade — or a lossless format to a photo, where it wastes space without helping.
The place the image will end up also shapes the choice. The web generally favors the smallest modern format that preserves acceptable quality, because page load is a real constraint. Print favors the highest fidelity. A transparent logo needs a format that supports alpha, while a full-bleed photo does not. Decide the format by both the content and the destination together — a format that is efficient for a web hero image is not necessarily right for the same image exported for print.