Flashtools - Free Client-Side PNG to WebP Converter
Optimize PNGs Instantly<br>Natively in your browser. No files ever touch our servers. Private, fast, and secure.
Drag & drop your PNG here<br>or browse your files<br>Supports PNG files. 100% processed in-browser.
File Details
Nameimage.png<br>Dimensions0 × 0 px
WebP Quality Settings
Compression Level80%<br>Smallest FileBalancedBest Quality
Compression Savings
Original0.0 KB
Optimized0.0 KB
0%space saved
Speed: 0ms
Download WebPChoose Different File<br>Interactive ComparisonSlide left and right to inspect image resolution & WebP quality details.
Compressing using browser Canvas...
Original (PNG)
Compressed (WebP)
How it works
100% Private & Local<br>Your images never leave your computer. All rendering, compression, and file output are handled inside your web browser sandbox using client-side JavaScript APIs.
High-Speed Performance<br>Leverages native web platform features like HTML5 Canvas and browser image processing engines to output high-fidelity WebP files in fractions of a second.
Modern WebP Format<br>Convert PNG screenshots, graphics, or assets into the modern WebP standard, slashing asset sizes by up to 80% while retaining rich alpha transparency channels.
Frequently asked questions<br>How do I convert a PNG to WebP with Flashtools?Drop a PNG file onto the page, click to browse for one, or paste it straight from your clipboard. Adjust the quality slider if you like, inspect the result in the comparison view, then click Download WebP. The whole conversion happens instantly in your browser.<br>Are my images uploaded to a server?No. Flashtools runs entirely in your browser using the HTML5 Canvas API. Your files never leave your device, and the converter keeps working even if you disconnect from the internet after the page has loaded.<br>How much smaller is WebP compared to PNG?It depends on the image, but screenshots and graphics typically shrink by 60–90% at the default 80% quality with little to no visible difference. The built-in before/after slider lets you verify the quality before downloading.<br>Does WebP keep transparency?Yes. WebP fully supports alpha transparency, so transparent PNGs stay transparent after conversion — at a fraction of the file size.<br>Which browsers does Flashtools work in?Chrome, Edge, Firefox, Opera, and other modern Chromium- or Gecko-based browsers all encode WebP natively. Safari currently cannot encode WebP from a canvas, so Flashtools will show a notice there instead of producing a broken file.<br>Is Flashtools free?Completely. No sign-up, no watermarks, no file limits, no ads. It is a static page — your own browser does the work.