WebP sits between the universal compatibility of JPEG and the cutting-edge efficiency of AVIF. Google introduced it in 2010 and it has been broadly supported since 2020 — typically 25–35% smaller than JPEG, supports transparency like PNG, and works in every browser still in regular use. For most web projects today, WebP is the default modern image format.

This guide explains when to use WebP, how it compares to alternatives, and the practical conversion workflow.

What WebP Is

WebP is a still-image format from Google built on the VP8 video codec. It supports both lossy and lossless compression, transparency (alpha channel), and animation — combining JPEG, PNG, and GIF capabilities in a single format.

When WebP Is the Right Choice

  • Web images, broadly — Best balance of size, quality, and compatibility
  • Replacement for animated GIFs — Smaller file size, more colours
  • Transparent images for the web — Replaces PNG at smaller file size
  • App icons and UI graphics — Lossless mode preserves edges
  • Conservative modernisation — AVIF is smaller but slower to encode and newer

When to Pick Something Else

  • Maximum compression matters — AVIF is smaller for the same quality
  • Legacy systems — Some embedded webviews, email clients, and design tools still prefer JPEG
  • Source files — Keep originals in PNG, TIFF, or RAW
  • Print — Use TIFF or high-quality JPEG

Browser and Tool Support

  • All modern browsers (Chrome, Edge, Firefox, Safari from 14)
  • WordPress supports WebP uploads natively since 5.8
  • Most CMS, social platforms, and image hosts accept WebP
  • Email clients vary — fallback to JPEG for email attachments

Quality Settings

  • Quality 80–90 — Visually lossless; good default for photographs
  • Quality 60–80 — Solid web quality with meaningful savings
  • Quality 40–60 — Aggressive; visible artifacts under scrutiny
  • Lossless mode — For logos, screenshots, line art where any artifact is unacceptable

Typical Size Comparison

A 1920×1080 web hero image:

  • PNG (lossless) — ~2.5 MB
  • JPEG quality 85 — ~350 KB
  • WebP quality 80 — ~220 KB
  • AVIF quality 75 — ~140 KB

Lossy vs Lossless WebP

  • Lossy — For photographs; significant size reduction; small visual loss
  • Lossless — For logos, screenshots, technical diagrams; smaller than PNG, no quality loss

Fallback Pattern

For maximum reach, use the <picture> element to serve WebP to supporting browsers and JPEG to older ones:

<picture> <source srcset="image.webp" type="image/webp"> <img src="image.jpg" alt="..."> </picture>

Common Pitfalls

  • Converting then deleting originals. Keep source files for re-editing
  • Email attachments in WebP. Some clients can't render; use JPEG for email
  • Animated WebP for old browsers. Most modern browsers handle it; some legacy ones don't
  • Quality slider misunderstood. WebP quality is not on the same scale as JPEG; experiment
  • Re-encoding losses. Each lossy conversion loses some quality; start from highest-quality source

Quick Tips

  • Use WebP as the default modern format for web images
  • Quality 75–85 for photographs; lossless for logos/UI
  • Provide JPEG fallback via <picture> if traffic includes very old browsers
  • Keep originals in editable format
  • Test how the image looks at multiple sizes before committing

Use the WebP Converter on Popupnote

The WebP Converter on Popupnote provides a clean tool for converting JPG, PNG, and other formats to WebP — for web developers, designers, and anyone reducing image weight on their site or in their content. The tool runs in your browser without any account required.