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In-memory processing
PNG to WebP runs as JavaScript inside this tab.
Never uploaded
Safe for financials, contracts and NDAs.
No caps or sign-ups
File size is limited only by device memory.
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Convert PNG to WebP to make website images load faster. WebP keeps transparency and is usually far smaller than PNG, which improves page speed scores and Core Web Vitals.
Yes. WebP supports a full alpha channel, so transparent backgrounds stay transparent. Use the quality slider to trade file size against detail; 85 percent is a good default for most images.
Yes. PNG to WebP runs entirely inside your web browser using JavaScript, so the file never leaves your device. It is safe for confidential documents such as contracts, financial records and IDs.
There is no fixed limit, because the file is processed on your own device. Very large files depend on your device's available memory; a modern laptop or phone handles hundreds of megabytes.
Yes. ZapConvert runs in any modern browser, including Safari on iPhone and iPad and Chrome on Android, with nothing to install. You can add several files at once and download them together as a ZIP.