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WebP vs PNG

WebP is a modern web format with both lossy and lossless modes; PNG is a universally supported lossless format.

WebP and PNG both support full alpha transparency, but they solve different problems. WebP, developed by Google, offers a lossy mode (built on VP8 intra coding) and a lossless mode, so it can produce much smaller files for photos and graphics on the web. PNG is a lossless-only format with near-universal support across browsers, operating systems, and editing software, making it the safe default when you cannot control how a file will be opened.

WebPPNG
CompressionLossy and lossless modesLossless only
Transparency (alpha)Full 8-bit alpha in both modesFull 8-bit alpha + 1-bit palette transparency
AnimationSupported (multi-frame, like animated GIF)Not supported (use APNG, a separate format)
Color depth8 bits per channel (24-bit color, no 16-bit/HDR)Up to 16 bits per channel; grayscale and indexed modes
Typical file sizeSmaller than PNG for most images; ~25-35% smaller than JPEG (lossy)Larger; efficient only for flat graphics, text, and screenshots
SupportAll current major browsers; some older tools lack itUniversal across browsers, OSes, and image software

Choose WebP when

  • You are publishing images on the web and want smaller files and faster page loads
  • You need transparency or animation but want better compression than PNG or GIF
  • You are serving photographic content where lossy compression is acceptable
  • Your audience uses current browsers, which all support WebP

Choose PNG when

  • You need guaranteed compatibility with any browser, OS, or older software
  • The image is a logo, icon, screenshot, or line art with sharp edges and flat color
  • You require lossless quality or higher-than-8-bit color depth (up to 16 bits/channel)
  • The file will be edited repeatedly and must not degrade with each save

Use WebP for images delivered on the web, where its smaller file sizes speed up page loads while preserving transparency and supporting animation. Use PNG when you need maximum compatibility, lossless quality, higher bit depth, or a format that any tool can open. A common workflow is to keep a PNG master and export WebP for publishing.

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Frequently asked questions

Is WebP always smaller than PNG?
Usually, but not always. WebP lossless typically beats PNG on most images, and WebP lossy is much smaller for photographic content. For very simple flat graphics PNG can occasionally match or beat WebP, so it is worth comparing both outputs.
Does converting PNG to WebP lose quality?
It depends on the mode. WebP lossless preserves the image exactly, like PNG. WebP lossy discards some data to shrink the file, which is fine for photos but can blur sharp edges in text and line art. Use lossless WebP when you need an exact copy.
Can WebP replace animated GIFs?
Yes. WebP supports multi-frame animation with full color and alpha, and animated WebP files are generally much smaller than the equivalent GIF. The main trade-off is that GIF still has broader support in very old or niche tools.
Will a WebP file open everywhere a PNG does?
Not quite. Every current major browser displays WebP, but some older programs, email clients, and legacy systems only handle PNG. If you need a file that opens reliably anywhere, PNG is the safer choice.