How to Convert PNG to WebP (Lossless or Lossy, Step by Step)
By AZ Utils Editorial · · 7 min read
Converting PNG to WebP is one of the quickest ways to make a website faster — WebP files are typically 25–35% smaller while keeping transparency. This guide shows you exactly how to convert PNG to WebP, whether it's a single image or a whole folder, plus when to choose lossless over lossy and how to convert back if you ever need to.
It's for developers, designers, bloggers and anyone optimising images for the web.
Key Concepts: What Conversion Does
Converting re-encodes your PNG into the WebP format. You choose between:
- Lossless WebP — pixel-identical to the PNG, smaller file. Best for logos, icons and screenshots.
- Lossy WebP — even smaller, with a tunable, usually invisible quality trade-off. Good for photographic PNGs.
Transparency is preserved either way.
In short: To convert PNG to WebP, upload the PNG to a converter, choose lossless (for graphics) or lossy (for photos), convert and download — transparency is kept automatically.
Step-by-Step: Converting PNG to WebP
- Open the PNG to WebP Converter.
- Drag and drop your PNG (or click to browse).
- Choose lossless (graphics) or lossy (photos).
- Click Convert and compare the file sizes.
- Download your WebP file.
To squeeze it further, run the result through the Image Compressor. To reverse, use WebP to PNG.
Converting many files
For a folder of PNGs, convert them in turn (or in batch where supported) and replace the references on your site. Because conversion is lossless-capable, you lose nothing by switching graphics over.
Try Our Free PNG to WebP Converter
Convert in seconds with our free PNG to WebP Converter — it runs in your browser, so files are never uploaded.
- ✅ Lossless or lossy output
- ✅ Transparency preserved
- ✅ Pair with the Image Compressor for max savings
- ✅ Free, no sign-up
Real-World Examples
Example 1 — A UI icon set
A set of transparent PNG icons converts to lossless WebP, cutting total weight by ~30% with no visible change.
Example 2 — A photographic PNG
A photo mistakenly saved as a 1.8 MB PNG converts to a ~250 KB lossy WebP — a huge saving for a web page.
Example 3 — Reverting for editing
A designer converts a received WebP back to PNG to edit it in software that doesn't open WebP, then re-exports to WebP for the web.
Common Mistakes to Avoid
- Using lossy WebP for sharp graphics — choose lossless to keep edges crisp.
- Not keeping the PNG master for future edits.
- Forgetting to update image references on the site after converting.
- Skipping a final compression pass.
Best Practices
- Lossless WebP for graphics, lossy for photos.
- Keep PNG originals as masters.
- Batch-convert existing PNGs for a site-wide win.
- Verify transparency after conversion.
Frequently Asked Questions
How do I convert PNG to WebP?
Upload the PNG to a converter, choose lossless or lossy, convert and download the WebP. Transparency is preserved automatically. Our browser-based tool keeps files on your device.
Should I choose lossless or lossy WebP?
Use lossless for logos, icons and screenshots to keep them pixel-perfect; use lossy for photographic images where a small, usually invisible quality trade-off gives a smaller file.
Does converting PNG to WebP keep transparency?
Yes. WebP supports full transparency, so transparent backgrounds carry over from the PNG.
Can I convert WebP back to PNG?
Yes, using a WebP to PNG converter. This is useful when you need a PNG for editing or for software that doesn't support WebP.
Is it safe to convert images online?
With our converter, yes — conversion runs in your browser, so your files are never uploaded to a server.
Conclusion
Converting PNG to WebP is fast, lossless if you want it, and one of the highest-impact image optimisations you can make. Choose the right mode, keep your PNG masters, convert, and compress — your pages get lighter without losing a thing.
Related Resources
- PNG to WebP Converter: Complete Guide — the full how-to
- PNG vs WebP — which to use
- How to Reduce Image Size — convert + compress
- WebP Browser Support — is it safe to use?
