Convert
Cut image weight with WebP
Convert PNG images to modern WebP with adjustable quality, cutting file size for faster pages, all locally.
For the best results: For web images, 85% WebP quality typically looks identical to the PNG at a fraction of the weight. Test one image first, then batch the rest.
Advanced settingsoptional, defaults work well
Processed entirely in your browser, your photos are never uploaded, logged, or stored.
What is PNG to WebP?
PNG to WebP is a free file converter that converts PNG images into modern WebP at a quality you choose, cutting file size for faster pages. Each image is decoded and re-encoded by your own browser's graphics engine, so your photos are never uploaded to a server. There is no queue, no watermark, and no account to create, and it keeps working with your connection off.
- ✦Runs entirely in your browser. Nothing you enter is ever uploaded
- ✦No account, no sign-up, and no data leaves your device
- ✦Works offline once the page has loaded
See it in action
A developer trims page weight by moving UI assets from PNG to WebP.
What you drop in
Six interface PNGs with transparency, quality 80%
What you get
Six .webp files, sharply smaller, with every transparent pixel still transparent, verified in testing with corner alpha still at zero after conversion.
Tip: WebP keeps alpha channels, so icons and cut-outs convert safely. Around 80% quality is the sweet spot for UI graphics; photos can often go lower before anything visible changes.
Use cases
What people use it for
Shrink heavy PNG hero images into WebP so a slow landing page finally passes speed tests
Batch-prepare blog screenshots as WebP files that load quickly on mobile connections
Compress PNG product images for an online store without visibly changing how they look
Who uses PNG to WebP?
Front-end developer
Compresses design-team PNG exports into WebP to hit performance budgets before every release goes live
Shopify store owner
Converts product photography to WebP so category pages load fast enough to stop shoppers bouncing
Technical blogger
Shrinks annotated screenshots for tutorials, keeping posts quick to load without blurring the interface text readers need
How it works
- 1Choose your files. They open in your browser, not on a server.
- 2Your device converts, compresses, or resizes them locally, with no upload.
- 3The converted files download straight back; nothing is kept anywhere.
Tips for the best results
- Start at quality 80 and only lower it if the file is still too heavy
- Zoom to 100 percent when comparing, since scaled-down previews hide compression artefacts
- Keep text-heavy screenshots at a higher quality; fuzz around letters is the first giveaway
- Transparency survives the conversion, so cut-out logos and product shots convert cleanly
- Convert your final edited PNG, not a work-in-progress, to avoid recompressing twice
FAQ
Frequently asked questions
What makes WebP smaller than PNG for the same image?
WebP uses far more modern compression techniques, including prediction of neighboring pixels and, in lossy mode, discarding detail the eye is unlikely to notice. PNG dates from the 1990s and stores images with a comparatively simple lossless scheme. The result is that a WebP at a sensible quality setting is routinely a fraction of the PNG's size while looking effectively identical on screen.
What quality setting should I choose?
For photographic content, somewhere around 75 to 85 is the usual sweet spot: files shrink dramatically and artefacts stay invisible at normal viewing sizes. Push lower only for thumbnails or backgrounds where softness will not be noticed. For screenshots or graphics with crisp text, use a higher setting, because compression fuzz shows up first around sharp edges. Try a value, inspect the result, and adjust.
Do the images I compress get sent to a server?
No traffic is involved at all. The WebP encoder runs inside the page on your own hardware, so your PNGs stay on your machine from start to finish. That means confidential mockups, unreleased product shots, and client work can be compressed without any third party ever holding a copy, and the tool keeps functioning even if your connection drops mid-session.
Do all browsers support WebP now?
Every current mainstream browser displays WebP, including Chrome, Firefox, Safari, and Edge, and support has been universal for several years. The old advice about serving fallback formats mainly applied to legacy Safari and Internet Explorer, which have faded from real-world traffic. Unless your audience is locked to very old corporate machines, you can serve WebP directly without a backup image.
Will converting to WebP lose transparency from my PNG?
WebP fully supports an alpha channel, so transparent areas in your PNG carry across intact. This is one of WebP's practical advantages over JPG, which flattens transparency onto a solid background. It means logos, cut-out product shots, and interface elements can all be compressed aggressively while keeping their see-through edges, something that previously forced designers to stay with bulky PNGs.
How much smaller is WebP than PNG?
It varies with the image, but savings are typically substantial: photographs compressed with lossy WebP often drop to a small fraction of their PNG size, while graphics and screenshots still shrink meaningfully. The quality slider controls the trade, so compress once, compare the preview against the original, and pick the smallest version that still looks right.
Why does Google recommend WebP for websites?
Smaller images mean faster pages, and page speed feeds directly into Core Web Vitals, which influence search ranking. Google developed WebP precisely to cut image weight on the web, and tools like PageSpeed Insights explicitly flag PNGs that could be served in a next-gen format. Converting is one of the quickest performance wins available.
Can I convert PNG to WebP offline?
Yes. Once this page has loaded, the encoder lives entirely in your browser, so you can switch off wi-fi and keep converting. There is no server dependency because nothing is uploaded in the first place, which also means no queue times and no limit on how many images you process.
Are there any usage limits?
None. Everything is generated locally in your browser, so there is no server cost, no metering, and no daily cap, use it as many times as you like, completely free.
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