How to convert PNG to WebP
- 1
Drop your PNG file into the converter above, or click to browse. Nothing is uploaded — the file stays on your device.
- 2
Adjust the settings (quality and an optional max width). Tip: Quality 80–90 is the sweet spot for web graphics — big savings with no visible difference. Set quality to 100 for pixel-perfect lossless WebP.
- 3
Click “Convert to WebP”. The conversion runs locally in your browser — larger files take longer, and a progress bar keeps you posted.
- 4
Preview the result and hit Download to save your WebP file.
Why convert PNG to WebP?
PNG's lossless compression makes for heavy files, and on the web that weight is pure page-load cost. WebP keeps what makes PNG useful — full alpha transparency, sharp edges — while compressing far more efficiently; converted images are routinely 30–80% smaller depending on content and quality setting.
Smaller images mean faster Largest Contentful Paint and better Core Web Vitals, which affect both user experience and search rankings. Every modern browser has supported WebP for years, so for website images the conversion is essentially free performance.
PNG vs WebP at a glance
| PNG | WebP | |
|---|---|---|
| Type | Raster image | Raster image |
| Compression | Lossless | Lossy or lossless, ~30% smaller than JPG/PNG |
| Transparency | Yes (full alpha) | Yes (full alpha) |
| Compatibility | Universal | All modern browsers; some apps/uploaders still reject it |
| Best for | Screenshots, logos, graphics with transparency | Web images, page-speed optimization |
About the formats
PNG Portable Network Graphics
PNG is the standard lossless image format: pixels are preserved exactly, and full alpha transparency is supported. That makes it ideal for screenshots, logos, and UI graphics — at the cost of much larger files than lossy formats, especially for photos.
WebP WebP (Google)
WebP is Google's modern web image format. It compresses roughly 25–35% smaller than JPG at equivalent quality, supports both lossy and lossless modes, and keeps full alpha transparency. All modern browsers display it, though some older apps and upload forms still reject it.
Frequently asked questions
Does WebP keep PNG transparency?
Yes — WebP supports full alpha-channel transparency, so logos, icons, and UI graphics keep their transparent backgrounds exactly as in the PNG.
Is the conversion lossy or lossless?
You choose with the quality slider: below 100 produces lossy WebP (much smaller, visually near-identical at 80+); setting quality to exactly 100 switches to true lossless WebP encoding, preserving every pixel.
Is this PNG to WebP converter really free?
Yes — completely free, with no watermarks, no sign-up, and no conversion limits. The tool is supported by ads on this page, so the converter itself never asks you for anything.
Are my files uploaded to a server?
No. This converter runs entirely in your browser using WebAssembly (a browser build of FFmpeg). Your PNG file never leaves your device — nothing is uploaded, stored, or seen by us, which also makes it safe for private or confidential files.
Is there a file size limit?
There's no hard limit. Because conversion happens on your own device, the practical ceiling is your browser's memory — files up to a few hundred megabytes work well on most computers. Very large files may be slow or fail on low-memory devices.
Why does the first conversion take a moment to start?
The first time you convert, your browser downloads the conversion engine (about 31 MB) once. It's cached after that, so later conversions start instantly — and they keep working even offline.
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