Converting in your browser, with nothing uploaded
Switching PNG files to WebP is one of the quickest wins for a faster website. This free PNG to WebP converter runs in your browser, so you can convert images online without uploading anything, without an account and with no watermark on the result.
WebP is the image format Google designed for the web. What is WebP in practice? A format that supports lossy and lossless compression plus transparency, shown by every current browser. Turning a PNG file to WebP usually gives you a smaller image that looks the same on screen.
Free, with no sign-up
There is no daily limit wall and nothing to install, so there is no converter free download to hunt for. Open the page, add files and save the results. Your settings are remembered for the next visit, which helps when you convert PNG images to WebP every week for a blog or shop.
Private and secure by design
The converter works on your own device. Your pictures never leave your phone or computer, so the conversion stays private. That matters for client work, ID scans or unreleased product photos, and it makes this a secure choice on shared office networks.
PNG vs WebP: what actually changes
Both formats show the same pixels, but they pack them differently. The table sums up the trade-offs so you know what to expect before you convert.
| PNG | WebP | |
|---|---|---|
| Compression | Lossless only | Lossy or lossless, your choice |
| Transparency | Yes (alpha channel) | Yes |
| Best for | Graphics, screenshots, editing | Web pages, apps, online stores |
| Opens in | Everything | All modern browsers, Windows 11 Photos, macOS Preview |
| Typical size | Baseline | Usually smaller at the same visual quality |
Does WebP lose quality?
Lossy WebP throws away detail your eye is unlikely to notice, the same idea as JPG. Lossless WebP keeps every pixel exactly. For a PNG, lossless WebP is the safe choice: the picture is pixel-for-pixel the same, only packed more tightly. That is where the WebP vs PNG size saving comes from.
WebP browser support
Chrome, Edge, Firefox, Safari, Opera and Samsung Internet all display the WebP format today. Older desktop programs and some email clients may still not open it, so keep your originals if you share files outside the web.
Does WebP support transparency?
Yes. WebP has a full alpha channel, so soft shadows and anti-aliased edges look the same as in the PNG. A PNG to WebP transparent background stays clear on any page colour.
Convert PNG to WebP without losing quality
Good results depend on picking the right mode for the picture. These tips keep the quality you care about, whether the job is a PNG to WebP high quality portfolio image or the smallest possible file for a banner.
Use lossless for logos and screenshots
Flat colours, sharp edges and small text suit lossless WebP. Choose PNG to WebP lossless for logos, icons, charts and app screenshots so edges stay crisp.
Use lossy for photo-like PNGs
A PNG that is really a photo, such as a cut-out product with soft shadows, can be converted with PNG to WebP lossy settings. The alpha channel stays, and the file becomes far lighter than the PNG.
Set a longest-side limit
A 4000 px image is too big for a blog column. Set the longest side to 1920 or 1200 px while you convert, a simple PNG to WebP resize that makes the file much smaller. For exact pixel sizes or social presets, use the image resizer first.
Check the size after converting
Every result shows the size before and after, plus totals for the batch. If one file came out larger, it was probably already well optimised; keep the original for that one.
When it is worth switching
Switch whenever the image lives on a web page or in an app. Common cases:
- Website logos and icons: a logo keeps its transparent background and loads faster in the header, and icons stay crisp.
- Screenshots in tutorials: a screenshot in lossless mode keeps text sharp at a smaller size.
- Product cut-outs: stores on Shopify or WordPress (WordPress media works the same) keep transparency.
- Stickers: WebP is the format WhatsApp uses for sticker packs, though sticker apps set their own size rules.
Website speed
Images are usually the heaviest part of a page. When you convert PNG to WebP for website use, download time drops and Core Web Vitals such as Largest Contentful Paint can improve, which is the main page speed benefit. Pair the conversion with the image compressor if you want the smallest possible file.
Why convert PNG to WebP at all?
Why switch when the PNG already works? Because a smaller file helps your Core Web Vitals scores and saves your visitors' data. If the WebP is not smaller for a particular image, simply keep the PNG.
Hitting upload limits in KB
Some portals and CMS fields cap uploads at 100 KB or 200 KB. Getting PNG to WebP in kb below the cap is often enough. If you need an exact target, the compressor's Exact size mode aims for 20, 50, 100, 200 or 500 KB or any number you type. Indian exam forms such as SSC or IBPS usually ask for JPG, not WebP, so do not send WebP there.
Converting a whole folder at once
You can convert multiple PNGs at once, so the tool works as a bulk converter. Add up to 30 images of 25 MB each, and each file appears as soon as it finishes.
- Select all files in the picker, drag a folder's contents in, or paste with Ctrl+V.
- Choose WebP, set quality or lossless, and optionally a longest-side limit.
- Watch the list fill up with before and after sizes, and retry any file that failed.
- Press Download all to save a single ZIP.
Tips for bulk runs
Rename files before a bulk PNG to WebP zip download if your website needs clean names, because each output keeps the original name with a .webp extension. Files are detected by their bytes, not the extension, so a mislabelled PNG image to WebP still converts correctly.
On iPhone, Android, Windows and Mac
The converter is a web page, so the steps are the same on every device.
iPhone and Android
Open the page in Safari or Chrome, tap to add photos, and the options open as a bottom sheet. Use Share to save or send the result. For PNG to WebP on iPhone or Android there is no separate app to install, which is handy when you manage a shop from your phone. Can you do it on a phone this way? Yes, the same tool works on both.
Windows and Mac
On a PC or laptop, drag files from File Explorer or Finder. It works in Chrome, Edge or Firefox for PNG to WebP on Windows 11, and Mac users can use Safari too. Windows 11 Photos and macOS Preview can then open the WebP files.
When the conversion is not working
Most problems have a quick fix. Work through these before you give up on an online PNG to WebP converter, and if PNG to WebP not working is what you searched for, start with the first one.
The file will not add
Check that the picture is under 25 MB and that the batch has no more than 30 files. The tool reads the bytes, so a wrong extension is fine, but a damaged download is not. Try saving the PNG picture again from its source.
The result looks different
Colours can shift slightly between viewers. Hold B to compare with the original in the same window; if that looks the same, the change is fine. To keep quality, raise the quality slider in the settings.
It is slow on my phone
Everything runs in browser memory, so very large pictures take longer on older phones. Set a longest-side limit, or use a desktop or laptop. On a fast device the conversion is quick and easy.
Posting on social media? PNG to WebP for instagram is not needed, since Instagram re-encodes uploads; resize for Instagram instead.
Related converters and next steps
Need the opposite direction? Use WebP to JPG or WebP to PNG when an older program refuses WebP. For an even smaller file, try JPG to AVIF, and for any other pair open the image converter hub.
After converting, the Continue with button sends the result straight to another tool, for example cropping the image or adding a watermark. Want a general image to WebP or photo to WebP route from other formats? The same WebP converter engine handles those in the hub.