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WebP vs PNG: format differences and use cases
Choosing between WebP and PNG depends on transparency requirements, file size targets, browser support, and whether lossless output is required.
What this guide explains
Choosing between WebP and PNG depends on transparency requirements, file size targets, browser support, and whether lossless output is required.
Technical scope
This guide describes browser-based file workflows, format tradeoffs, and ConvertUnlimited processing boundaries for supported tools.
Technical difference
PNG is a lossless format that has been the standard for transparent images for decades. WebP is a newer format developed by Google that offers both lossy and lossless compression, often resulting in much smaller files than PNG.
Comparison Table
| Feature | WebP | PNG |
|---|---|---|
| Compression | Lossy & Lossless | Lossless |
| Transparency | Supported | Supported |
| File Size | Smaller (up to 26% less) | Larger |
| Best for | Web delivery, photos, mixed transparency use | Logos, icons, screenshots, lossless graphics |
Pros and Cons
WEBP
- Often smaller file size
- Supports both lossy and lossless modes
- Strong browser support
- Not ideal for high-end print
- Older software might lack support
PNG
- Lossless quality (no data loss)
- Universal software support
- Preserves sharp edges
- Often large file sizes
- Only supports lossless compression
When to Use Each
Use WebP for modern web delivery when smaller files are useful and the publishing workflow supports the format. Use PNG when transparency, sharp edges, screenshots, or lossless graphics are more important than file size.
Related guides
FAQ
Does WebP support transparency like PNG?
Yes, WebP supports alpha channel transparency just like PNG, but usually at a much smaller file size.
Is WebP better than PNG for SEO?
WebP can help performance when it produces smaller files, but SEO depends on many page-level factors. Use WebP when it improves delivery without breaking compatibility.
Can I convert PNG to WebP in the browser?
Yes. Use the ConvertUnlimited image converter to decode selected PNG files and write WebP output locally in the browser for supported workflows.
Action
Convert between PNG and WebP in the browser: PNG to WebP or WebP to PNG.