To convert PNG to WebP, drop your PNG files into the box above, set the WebP quality (85 by default) and click Convert. Your browser encodes each image as WebP locally and keeps transparent areas intact. The new files use the original names with a .webp extension and can be downloaded one by one or as a ZIP.
How to use the PNG to WebP tool
- 1
Select PNG files
Drop your .png images into the drop area or click to browse — up to 50 per run, up to 50 MB each.
- 2
Adjust WebP quality
Use the quality slider (10–100, default 85). Higher values keep more detail; lower values give smaller files.
- 3
Convert
Click Convert. If your browser cannot encode WebP, the tool tells you instead of quietly saving a different format.
- 4
Download
Save each WebP individually or download them all in one ZIP.
Why convert PNG to WebP for the web?
PNG is the go-to format for graphics with transparency, but it is lossless and can get heavy, especially for large hero images, illustrations with gradients or screenshots of busy interfaces. WebP, developed by Google, supports transparency too, and its lossy mode usually produces much smaller files than PNG for that kind of content.
For a website, smaller images mean less data to download and faster page loads, which visitors notice on mobile connections. WebP is supported by all current major browsers, so it is a practical way to lighten PNG-heavy pages without giving up transparent backgrounds.
Transparency and quality: what to expect
Unlike PNG to JPG, this conversion keeps the alpha channel. Logos, icons, product cut-outs and UI elements stay transparent, so they still sit cleanly on any background colour. No background fill is applied and none is needed.
The quality slider controls the lossy WebP encoding. The default of 85 works well for most graphics and photos; very fine details such as one-pixel lines or tiny text can soften at lower settings, so check those images at their real display size. If a graphic must stay pixel-perfect, such as a crisp diagram, keeping it as PNG may be the right call.
Results vary from image to image. Flat, simple graphics that already compress well as PNG may shrink only a little, while photographic PNGs usually benefit the most. Compare the before and after sizes before replacing files in bulk.
Optimise unreleased assets without sharing them
Designers and developers often convert images before a launch: new product visuals, unannounced app screens, client mockups. Sending those to an unknown upload service is an unnecessary risk when the job can be done locally.
Krawly encodes the WebP files with your browser's own canvas encoder. The PNGs are never uploaded to Krawly's servers, nothing is kept after you close the tab, and there is no account to create. Because WebP encoding depends on the browser, the tool will clearly say so if yours does not support it, rather than giving you a file in the wrong format.
Tips for the best results
- Start at the default quality of 85 and only lower it if you need smaller files.
- Inspect small text and thin lines at 100% zoom after converting; raise the quality if they look soft.
- Keep the original PNGs as your master copies for future edits.
- If you also need to cut dimensions, run the images through the resize tool as well.
- For PNGs that are really photographs, the size reduction is usually greatest.
Frequently asked questions
Does PNG to WebP keep transparency?
Yes. WebP supports an alpha channel, so transparent and semi-transparent areas of your PNG are preserved. No background colour is added, which makes WebP a good lighter-weight alternative for logos, icons and cut-out images.
Is PNG to WebP lossless?
Not with this tool. Krawly encodes WebP with a quality setting from 10 to 100 (default 85), which is lossy compression. At sensible settings the difference is usually hard to see, but the pixels are not an exact copy of the PNG.
How much smaller will my files be?
It depends on the image. Photographic PNGs typically shrink a lot, while simple flat graphics may shrink only slightly. Compare the original and converted file sizes for your own images rather than relying on a general figure.
Why does the tool say my browser can't encode WebP?
WebP encoding uses your browser's built-in canvas encoder, and not every browser supports writing WebP. Instead of silently producing a PNG, the tool tells you. Try a current version of Chrome, Edge or Firefox.
Are my PNG files uploaded?
No. Your browser encodes the WebP files itself, so pre-launch graphics and client assets are never sent to Krawly's servers. Nothing is stored, no account is needed, and everything is discarded when you close the tab.
Can I convert a whole folder of PNGs?
You can select up to 50 PNG files in one run, each up to 50 MB. All of them are converted with the same quality setting, and you can download the results as a single ZIP.
Private by design. Every Krawly converter runs inside your browser using JavaScript and WebAssembly. Your files are not uploaded, stored or seen by anyone — when you close the tab, they are gone.