Which format should I choose?

Use WebP for the smallest files on the modern web, JPG for maximum compatibility with photos, and PNG when you need transparency or pixel-perfect graphics like logos and screenshots.

Are my images uploaded to a server?

No. The JoliTools image converter processes your file entirely in your browser. Nothing is uploaded, stored, or shared, and there is no watermark added to your image.

Image Converter

Convert images between JPG, PNG and WebP instantly

Choose image

or drag & drop a JPG, PNG or WebP file here

Max 50MB. Processed 100% in your browser, nothing is uploaded.

About this tool

The JoliTools image converter switches your images between JPG, PNG, and WebP without uploading them anywhere. Converting a PNG screenshot to WebP can cut its file size dramatically, while turning a WebP into a JPG makes it compatible with older software that does not support newer formats. The whole conversion happens in your browser in seconds, and a before/after size comparison shows exactly what you gained.

For JPG and WebP output, a quality slider lets you trade file size against fidelity: 80–90% keeps photos looking pristine while stripping most of the weight, and lower values are fine for thumbnails and previews. PNG output is always lossless and preserves transparency, which makes it the right choice for logos, icons, and graphics with sharp edges. Transparent PNGs converted to JPG get a clean white background, since JPG has no alpha channel.

How to use the image converter

1Click “Choose image” and select a JPG, PNG or WebP file (up to 50MB).
2Pick your output format: WebP for the smallest files, JPG for photos, or PNG for lossless quality and transparency.
3If you chose JPG or WebP, drag the quality slider, 80–90% is the sweet spot for photos.
4Click “Convert image” and compare the original and converted file sizes.
5Click “Download” to save the converted image to your device.

Good to know

Because the converter never touches a server, it works offline-capable, has no queues, and keeps private images private, handy for client work or personal photos. Files up to 50MB are supported, and everything runs on phones and desktops alike. Combine it with the image resizer to change dimensions and format in one pass, or the image compressor when you want the smallest possible file for the web.

Frequently asked questions

It depends on the target format. PNG conversion is lossless, so pixels are preserved exactly. JPG and WebP are lossy formats, but at 80–90% quality the difference is virtually invisible for photos while the file gets much smaller.

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