Convert PNG to WebP Online — Free & Private
Converting PNG to WebP re-encodes an image from Portable Network Graphics into Web Picture format. This free converter does it entirely inside your browser — your files are never uploaded — and handles unlimited batches with no sign-up, no watermark and no software to install.
Drag & drop your PNG files here
Batch conversion supported · up to 50 MB per file
🔒 Processed locally in your browser — nothing is uploaded.
How to convert PNG to WebP
To convert PNG to WebP: add your files to the converter above, confirm WebP is selected as the output format, press Convert, then download the result. The whole process runs in your browser and takes a few seconds.
- Add your files. Drag PNG files onto the box above, or click Choose files to browse. Multiple files at once are fine — there is no limit on how many.
- Check the settings. WebP is already selected. Adjust the quality slider if you want a smaller file or a more faithful one; 85% suits most images. Turn on Resize output if you need specific dimensions.
- Press Convert. Each file is decoded, redrawn and re-encoded on your device, with progress shown per file.
- Download. Take files individually, or use Download all as ZIP for the whole batch.
Why convert PNG to WebP?
WebP keeps PNG's alpha transparency but compresses far harder, which is why it is the standard recommendation for images shipped on a website. Savings of 60–80% over PNG are routine for photographic content.
PNG vs WebP: what actually changes?
The practical differences are compression, transparency and compatibility. PNG is lossless with full 8-bit alpha channel — 256 levels of transparency transparency; WebP is lossy or lossless with full alpha channel, in both lossy and lossless modes transparency. The table below sets out every difference that affects the result.
| Property | PNG | WebP |
|---|---|---|
| Compression | Lossless | Lossy or lossless |
| Transparency | Full 8-bit alpha channel — 256 levels of transparency | Full alpha channel, in both lossy and lossless modes |
| Animation | Only via the separate APNG extension | Supported |
| Colour depth | Up to 48-bit colour, plus a 16-bit alpha channel | 24-bit colour plus an 8-bit alpha channel |
| Introduced | 1996 | 2010 |
| Browser support | Universal — supported everywhere since the late 1990s | All modern browsers — Chrome and Firefox from 2010–2019, Safari from version 14 (2020), Edge from 2018 |
| Typical size | Roughly 5–10× a JPG for photographs; often smaller for flat graphics | Roughly 0.65–0.75× a JPG at matched quality |
| Best for | Logos, screenshots, diagrams, icons and any graphic with sharp edges, flat colour or transparency. | Images shipped on a website, where you want JPG-like size with PNG-like transparency. |
What is a PNG file?
PNG stands for Portable Network Graphics. Introduced in 1996 by PNG Development Group, later a W3C Recommendation, it uses lossless compression and is best suited to logos, screenshots, diagrams, icons and any graphic with sharp edges, flat colour or transparency.
Lossless compression with full alpha transparency. The right choice for logos, screenshots, diagrams and any graphic with sharp edges or flat colour.
| Property | PNG |
|---|---|
| Full name | Portable Network Graphics |
| File extensions | .png |
| MIME type | image/png |
| Introduced | 1996 |
| Developed by | PNG Development Group, later a W3C Recommendation |
| Compression | Lossless |
| Colour depth | Up to 48-bit colour, plus a 16-bit alpha channel |
| Transparency | Full 8-bit alpha channel — 256 levels of transparency |
| Animation | Only via the separate APNG extension |
| Browser support | Universal — supported everywhere since the late 1990s |
| Typical file size | Roughly 5–10× a JPG for photographs; often smaller for flat graphics |
PNG strengths
- Lossless — the decoded pixels are exactly the ones you saved
- True alpha transparency with soft edges
- Re-saving never degrades the image
PNG limitations
- Files are much larger than JPG for photographs
- No native animation support
- No CMYK, so it is unsuitable for professional print work
What is a WebP file?
WebP stands for Web Picture format. Introduced in 2010 by Google, it uses lossy or lossless compression and is best suited to images shipped on a website, where you want JPG-like size with PNG-like transparency.
Google's modern web format. Typically 25–35% smaller than JPG at the same visual quality, with transparency and animation support built in.
| Property | WebP |
|---|---|
| Full name | Web Picture format |
| File extensions | .webp |
| MIME type | image/webp |
| Introduced | 2010 |
| Developed by | |
| Compression | Lossy or lossless |
| Colour depth | 24-bit colour plus an 8-bit alpha channel |
| Transparency | Full alpha channel, in both lossy and lossless modes |
| Animation | Supported |
| Browser support | All modern browsers — Chrome and Firefox from 2010–2019, Safari from version 14 (2020), Edge from 2018 |
| Typical file size | Roughly 0.65–0.75× a JPG at matched quality |
WebP strengths
- Around 25–35% smaller than JPG at comparable visual quality
- The only widely supported format offering both lossy compression and alpha
- Handles photographs and flat graphics competently
WebP limitations
- Desktop editors and some older CMS uploaders still refuse it
- Slightly slower to decode than JPG
- Superseded on pure compression by AVIF
Does converting PNG to WebP lose quality?
Yes, slightly — WebP is a lossy format, so some detail is discarded during encoding. At the default 85% quality the difference is invisible to the eye for most images. Raise the slider toward 100% when archiving, or lower it when the smallest file matters most.
Two distinct things are often confused here. The first is whether the target format discards data: WebP is lossy or lossless, so it does, in a controlled amount you set with the quality slider. The second is whether the source already lost data: PNG is lossless, so the source holds the original detail intact.
A practical rule: converting repeatedly between lossy formats compounds the damage each time. If you expect to edit an image more than once, work in a lossless format and export to a lossy one only at the end.
Is it safe to convert PNG files here?
Yes, and you can verify it rather than trust it. Your PNG file is read, decoded and re-encoded inside your browser tab. There is no upload endpoint on our side, so no copy of your image exists anywhere but your own device.
Most online converters upload your file to a server, process it there and promise to delete it later. That promise is unverifiable, and it does not survive a breach, a misconfigured storage bucket or a legal request. This tool removes the question entirely: the code comes to you, the file stays put.
To confirm it for yourself, open your browser’s developer tools, switch to the Network tab, and convert a file. You will see the page assets load and nothing carrying your image leave. It also works with your connection switched off entirely, once the page has loaded.
PNG and WebP at a glance
PNG files use the image/png MIME type and the .png extension; WebP files use image/webp and .webp. The summary below covers the properties that matter when choosing between them.
| PNG | WebP | |
|---|---|---|
| Full name | Portable Network Graphics | Web Picture format |
| Extension | .png | .webp |
| MIME type | image/png | image/webp |
| Year | 1996 | 2010 |
| Best for | Logos, screenshots, diagrams, icons and any graphic with sharp edges, flat colour or transparency. | Images shipped on a website, where you want JPG-like size with PNG-like transparency. |
PNG to WebP: frequently asked questions
- How do I convert PNG to WebP?
- Open this page, drag your PNG files onto the drop zone, and press Convert. WebP is already selected as the output format. The conversion runs in your browser and finishes in seconds, then you download the result individually or as a ZIP.
- Is this PNG to WebP converter free?
- Yes, completely. There is no account, no daily limit, no watermark and no paid tier. You can convert as many PNG files as you like, as often as you like.
- Are my PNG files uploaded to a server?
- No. The conversion runs entirely in your browser using the Canvas API and WebAssembly codecs. Nothing about your file is transmitted to us, so there is nothing for us to store, share or lose. You can verify this by opening your browser's Network tab while converting.
- Will converting PNG to WebP reduce quality?
- WebP is a lossy format, so some detail is discarded. The quality slider defaults to 85%, which is visually indistinguishable from the original for most images. Raise it toward 100% for archiving, or lower it for the smallest possible file.
- Will the file get bigger or smaller?
- WebP files are typically roughly 0.65–0.75× a jpg at matched quality, against roughly 5–10× a jpg for photographs; often smaller for flat graphics for PNG. The converter shows the before and after size for every file so you can see the exact result.
- Can I convert multiple PNG files at once?
- Yes. Drop the whole batch in and they convert one after another with individual progress. Download them one by one, or take the entire set as a single ZIP file built in your browser.
- Does WebP support transparency?
- Yes — full alpha channel, in both lossy and lossless modes. Transparent areas in your PNG file are preserved in the WebP output.
- Is there a file size limit?
- Each file is capped at 50 MB, because conversion happens in your browser's memory and very large files can crash a tab, particularly on phones. There is no limit on how many files you convert.
- Does it work on iPhone, Android, Mac and Windows?
- Yes. It runs in any modern browser on any operating system — there is nothing to install. All modern browsers — Chrome and Firefox from 2010–2019, Safari from version 14 (2020), Edge from 2018.
- Do I need to install software or sign up?
- Neither. There is no download, no extension, no account and no email address required. Open the page and convert.
Related conversions
Need to go the other way? Try WebP to PNG. Other conversions involving these formats: