PNG to WebP Converter
WebP has two modes, and the PNG decides which one
Lossy WebP is the right target for photographic PNGs — smaller than JPG at similar quality, and it keeps the alpha channel that PNGs often carry. Lossless WebP is the right target for UI, logos, text, and screenshots — usually smaller than the source PNG with zero quality loss and full alpha preserved.
- Photo PNG (1080p)
- 3-10 MB
- Lossy WebP (~80-85)
- 150-400 KB
- Rough gain
- 5-15×
Most encoders pick automatically based on content, but when you're driving it by hand, pick by what the image actually is: photographic content goes lossy, flat/text content goes lossless. Getting that choice right matters more than fine-tuning the quality slider.
Lossy vs lossless WebP in practice
- Lossy WebP: photos, noisy gradients, anything where a little smoothing buys a lot of bytes. Keeps alpha when you need cutouts over variable backgrounds.
- Lossless WebP: screenshots, icons, type, thin strokes — anywhere JPEG-style ringing would show up. Often beats PNG on file size with identical pixels.
I treat the quality number on lossy WebP like a denser scale than JPG: WebP at 80 often looks like JPG at 90 on the same photo. Default around 80-85 for delivery; push higher for hero or product shots that get zoomed.
When to keep the PNG
Archival masters belong in PNG — you want the exact pixels preserved without a codec choice baked in. Anything destined for a client or pipeline that still rejects WebP stays PNG too; that's rare in 2026 but still shows up in email signatures, legacy Office imports, and a few older CMS plugins.
- Master files: keep PNG (or raw) until the final export pass.
- Strict compatibility: some uploaders only accept JPG or PNG — match the requirement.
- Editing chains: if the next step is lossy again, avoid stacking unnecessary passes; sometimes PNG in the middle is the least-bad option.
Everywhere else — web delivery, CDN-served assets, social uploads, app bundles — WebP is the default. The compatibility cost is effectively zero on modern targets, and the byte savings compound across every request.
PNG to WebP questions, answered
Does PNG to WebP reduce file size?
Usually yes. Photographic PNGs often shrink 5-15× at visually similar quality in lossy WebP. Flat UI and screenshot PNGs may see a smaller gain; lossless WebP can still beat PNG on bytes with zero quality loss.
Does WebP support transparency like PNG?
Yes. WebP supports 8-bit alpha in both lossy and lossless modes, so transparent PNGs can stay transparent in WebP — unlike JPEG.
Should I use lossy or lossless WebP from PNG?
Use lossy WebP for photographic PNGs. Use lossless WebP for UI, logos, text, and screenshots where edges must stay crisp. Picking the right mode matters more than nudging the quality slider by a few points.
What WebP quality should I use?
For lossy WebP from photos, 80-85 is a solid default — WebP often matches a higher JPG quality number by eye. Use 85+ for hero or product imagery. For PNG sources that are already UI-heavy, prefer lossless WebP instead of cranking lossy quality.
When should I keep PNG instead of WebP?
Keep PNG for archival masters, destinations that still reject WebP (some email clients, legacy CMS plugins, older Office builds), or when you need maximum compatibility without a picture-element fallback. For modern web delivery, WebP is usually the better export.