PNG vs. WebP: Which Format Should You Use for Your Website?

PNG has been the web's default for lossless graphics for twenty-five years. WebP is the modern challenger — smaller files, the same transparency, and now 97%+ browser support. So when should you actually use which? Here's a practical head-to-head for developers and designers, with the workflow that makes the switch painless.

The Short Answer

For nearly every asset on a modern public website, WebP wins. It produces smaller files at the same visual quality, supports transparency, and works in every browser shipping today. PNG is still the right choice for source masters, design files you'll keep re-exporting from, and the rare cases where you're shipping to a non-browser consumer that can't read WebP yet.

The interesting question isn't whetherto use WebP — it's how to fold it into your build pipeline without breaking anything. We'll get there. First, the comparison.

File Size

This is where WebP genuinely changes the math. Google's own benchmarks (and a decade of independent ones) put the numbers at:

Lossless WebP vs. PNG: 20–26% smaller on average, with no quality difference whatsoever.
Lossy WebP vs. PNG: 60–80% smaller for photos and screenshots, at quality settings (80–90) that are visually indistinguishable from the lossless original.
Lossy WebP vs. equivalent JPG: 25–35% smaller at the same SSIM/visual quality.

For a typical content page with a hero image, three screenshots, and a few icons, converting to WebP usually shaves 60–70% off the total image payload. On a slow mobile connection, that's the difference between a page feeling instant and feeling sluggish.

Quality and Transparency

PNG is lossless by definition — what you save is exactly what you put in, pixel for pixel. WebP comes in both flavors:

Lossless WebP

Pixel-identical to the source. Use for logos, icons, UI chrome, pixel art, or anything with hard edges and flat colors. About 20% smaller than the equivalent PNG.

Lossy WebP

Compressed like JPG but smarter. Use for photos, screenshots, and anything photographic. At quality 85, artifacts are invisible without zooming. Dramatically smaller than PNG or JPG.

Both flavors of WebP support 8-bit alpha transparency, the same as PNG — so the historical "PNG for transparency, JPG for size" rule no longer applies. WebP gives you both at once.

Browser Support

WebP is supported in every actively-developed browser:

Chrome and Edge — since 2010 (Chrome) / 2018 (Edge).
Firefox — since 2019.
Safari — since 14.0 (September 2020), including iOS.
Opera, Samsung Internet, and all Chromium derivatives.

Global usage support is above 97%. The remaining gap is almost entirely Internet Explorer (officially dead since 2022) and a few niche embedded browsers. For a public website, you can serve WebP directly via <img src="photo.webp"> without a fallback. For a tightly-controlled enterprise environment with IE holdouts, use the <picture> pattern below.

Use Cases — Side by Side

Hero images, content photos, screenshots

Use lossy WebP at quality 80–85. Massive size win, no visible quality loss.

Logos, icons, UI assets with transparency

Use lossless WebP.Pixel-perfect like PNG, about 20% smaller. Fall back to PNG only if you ship to a consumer that can't read WebP.

Source masters and design files

Keep as PNG (or PSD/RAW). Lossless, edits cleanly, and every tool reads it. PNG is your archive format; WebP is your build output.

Email, PDFs, exported documents

Stick with PNG or JPG. Email clients and PDF readers still trail browsers on WebP support.

Favicons and platform icons

Use PNG (or ICO). Browser favicon pipelines and OS icon caches still expect PNG/ICO; WebP favicons are a coin-flip.

The Conversion Workflow

For a typical site rollout, the pipeline is three steps:

Keep PNG masters. Source files stay PNG (or whatever your design tool exports) in your repo or asset store. Treat them as the source of truth.
Export WebP for the website. Either at build time (Next.js, Astro, and most modern frameworks do this automatically with their image components) or as a one-time batch via a converter.
Serve WebP directly via <img src="photo.webp">. Only wrap in <picture> with a PNG fallback if you actually serve users on non-WebP browsers — most sites don't.

The fallback pattern, if you need it, looks like this:

<picture>
  <source srcset="hero.webp" type="image/webp">
  <img src="hero.png" alt="..." width="1600" height="900">
</picture>

Browsers that understand WebP fetch the smaller file; the rest fall back to PNG. Same markup, two file sizes, zero JavaScript.

When PNG Is Still the Right Choice

Source masters and archives.Don't throw away PNGs after exporting WebP — keep them so you can re-export when AVIF (or its successor) takes over.
Tooling that can't read WebP. Some image-processing pipelines, older CMS plugins, and desktop-publishing software still choke on WebP. Convert back to PNG before handing off.
Favicons and OS-level icons. Browser favicon caches, app icons, and OS-level tooling expect PNG/ICO.
Anywhere you control the consumer and don't care about file size. Internal tools, exports going to legacy systems, screenshots in bug reports. PNG just works.

The Practical Verdict

For a public website in 2026, default to WebP and treat PNG as the format you author and archive in. Lossy WebP for photos and screenshots, lossless WebP for logos and icons, PNG masters in your asset store. Skip the <picture> fallback unless you have real evidence of non-WebP users. The payload savings are immediate, the quality is the same, and the markup is simpler than the old PNG-or-JPG dance.

Convert PNG to WebP Now

Drop PNGs in and pick lossy or lossless WebP. Free, private, runs entirely in your browser — no uploads, no signups.

Open the PNG to WebP Converter

Related Converters

Jump straight to the conversion you need — every route runs entirely in your browser:

PNG to WebP WebP to PNG JPG to WebP WebP to JPG PNG to JPG JPG to PNG SVG to WebP SVG to PNG

Frequently Asked Questions

Is WebP always better than PNG for the web?

For photos, screenshots, and most UI assets — yes. Lossy WebP is 25–35% smaller than PNG at indistinguishable quality, and lossless WebP is typically 20–26% smaller than PNG with no quality difference at all. The exception is when you need a format that every imaginable client can open without a fallback: legacy email clients, ancient corporate browsers, and some image-processing pipelines still only handle PNG.

Do all browsers support WebP?

Yes, every browser shipping today supports WebP — Chrome, Edge, Firefox, Safari (14+, released 2020), Opera, and Samsung Internet. Global support is above 97% as of 2026. The only holdouts are Internet Explorer (long-dead) and a handful of niche embedded browsers. For practical web work, you can serve WebP directly without a fallback unless your analytics show meaningful IE traffic.

Does WebP support transparency like PNG?

Yes. Both lossy and lossless WebP support full 8-bit alpha transparency, the same as PNG. A transparent logo or icon saved as WebP renders identically to PNG but at a fraction of the file size — usually 25–35% smaller for lossy, ~20% smaller for lossless.

Will converting PNG to WebP lose quality?

Only if you choose lossy WebP. Lossless WebP produces a pixel-identical copy of the PNG — zero quality loss, just smaller. Lossy WebP at 85–90% quality is visually indistinguishable from the original for nearly all images, while cutting size by 60–80%. For UI graphics and logos, use lossless. For photos and screenshots, use lossy at 85%.

Should I keep PNG masters and serve WebP?

Yes — this is the standard workflow. Author and archive in PNG (or your original RAW/PSD), then export WebP copies for the website. PNG is your source of truth; WebP is the build output. That way, when WebP is eventually superseded by AVIF or whatever comes next, you re-export from the master instead of round-tripping lossy → lossy.