← ZapToolbox home

Image Format Converter

Free to use, with no signup. Your tool inputs are processed in your browser.

Image resizer

Maximum output: 6,000 pixels per side and 24 million pixels total.

JPG / PNG / WebP converter

Uses the image and dimensions selected above. Choose a format and download your result.

JPG uses a white background for transparent images. PNG is lossless; its quality is not changed by the slider. Browser export may remove metadata and does not guarantee a smaller file.

How it works

Choosing an image format

How to use this tool

Choose a supported image, select JPG, PNG or WebP as the output and adjust quality when that format supports it. Convert the image, download the result and check its appearance, extension and file size. Keep the original in case the destination needs another format.

A practical example

A transparent logo is usually better kept as PNG or a supported transparent WebP. Converting it to JPG replaces transparency with white. For a photograph, JPG or WebP may be a practical choice, but the best result depends on the image and the destination.

Frequently asked questions

Which input files can I use?

This tool accepts JPG, PNG and WebP images up to 15 MB and 40 megapixels. It is not a PDF converter and does not provide HEIC or SVG import. Use an appropriate converter for unsupported source formats.

Why does the quality control not change a PNG?

PNG export does not use the lossy quality setting in the same way as JPG or WebP. Moving the slider is therefore not a promise that a PNG will become smaller. Compare actual downloads when file size matters.

Will the converted file always be smaller?

No. Some conversions increase file size, especially when a compressed photograph becomes PNG. Browser encoding can also vary. Image metadata may not be preserved, so keep your original if camera information, colour data or other embedded details are important.

Where is my information processed?

This tool processes your input in your browser rather than uploading it for conversion. Keep the page open until the operation finishes. Some tools need an internet connection to load their processing libraries. On a phone, closing the tab or switching apps during a large job may interrupt the operation.

Before you use the result

Check the output against your source and the requirements of the website or person receiving it. Keep an original copy so you can repeat the operation with different settings. If the result is unexpected, try a small, non-sensitive sample and describe the tool and steps on our contact page.

Explore PDF tools · Text and image tools · Privacy policy

Browse all tools →