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WebP vs PNG: File Size, Quality, and When to Use Each

Published on March 1, 2026

WebP lossless images are about 26% smaller than equivalent PNGs with no quality difference. If you are serving images on a website, WebP is the better choice for most cases. PNG is still the go-to when you need universal compatibility or pixel-perfect editing.

File Size Comparison

Google developed WebP specifically to reduce image file sizes on the web. In lossless mode (no quality loss), WebP files are typically 25-30% smaller than PNG. In lossy mode, the savings can reach 50% or more. For a website serving hundreds of images, that translates directly into faster page loads and lower bandwidth costs.

Quality and Features

  • Both support transparency. WebP and PNG both handle alpha channels for transparent backgrounds.
  • Both support lossless compression. Neither format loses quality in lossless mode.
  • WebP also supports lossy compression. This gives you a slider between quality and file size that PNG does not offer.
  • WebP supports animation. WebP can replace animated GIFs with much smaller file sizes. PNG does not support animation (APNG exists but has limited support).

Browser Compatibility

As of 2026, WebP works in Chrome, Firefox, Safari, Edge, and Opera. The last major holdout (older Safari versions) has been resolved. PNG works everywhere and has for decades. If you are targeting modern browsers, WebP compatibility is not a concern.

When to Use PNG

  • Image editing workflows where you need to open and re-save repeatedly
  • Screenshots and diagrams with sharp text (PNG handles crisp edges well)
  • When your CMS or platform does not accept WebP uploads
  • Print workflows that expect standard image formats

When to Use WebP

  • Website images where page speed matters
  • Replacing animated GIFs with smaller alternatives
  • Any web project where you control the image pipeline

Need to convert between formats? Our WebP to PNG converter handles the switch when you need PNG compatibility, and our Image to WebP converter gets you the smaller files for web use.

Want a broader format comparison? Read our best image format for web guide covering JPG, PNG, and WebP. For a focused JPG vs PNG decision, see PNG vs JPG. Comparing WebP to JPG instead? See WebP vs JPG. For WebP vs Apple's HEIC format, see WebP vs HEIC. For vector vs raster on the web, see SVG vs WebP.