What is WebP Format and Why Should You Use It?

What WebP Is and Why Google Created It

WebP was derived from the VP8 video codec — the same technology Google used for video compression. Google open-sourced both VP8 and WebP, making the format free to use with no licensing costs.

The motivation was straightforward: JPEG was created in 1992 and PNG in 1996. Neither format takes advantage of the last three decades of image compression research. A modern codec applied to still images could achieve significantly better compression, and a faster web benefits everyone — users, publishers, and Google's own search ranking signals.

Google published the initial WebP format in 2010 and has refined it since. The format supports:

• Lossy compression: Like JPEG, with better compression ratios
• Lossless compression: Like PNG, but ~26% smaller
• Transparency (alpha channel): Like PNG, but JPEG does not support this
• Animation: Like GIF, but much smaller files

This combination — lossy, lossless, transparency, animation in one format — makes WebP capable of replacing all four legacy formats.

How WebP Achieves Smaller File Sizes

WebP uses two different compression algorithms depending on the mode:

Lossy WebP uses a variant of the VP8 video codec's block prediction. Instead of JPEG's 8×8 DCT blocks, WebP uses variable-size prediction blocks that can adapt to image content. It also uses a more sophisticated entropy coding step (arithmetic coding instead of Huffman coding), which squeezes additional efficiency out of the same data.

The practical result: WebP lossy produces files 25–35% smaller than JPEG at equivalent perceived quality. The same photograph that is 300KB as JPEG quality 85 is typically 195–225KB as WebP at equivalent visual quality.

Lossless WebP uses a combination of spatial prediction (inferring pixel values from neighbors), colour transforms (converting to a representation that compresses better), and a custom entropy coding format. The result is approximately 26% smaller than PNG on average for the same image.

The transparency advantage: JPEG cannot store any transparency information. PNG transparency (alpha channel) adds significant file size. WebP supports full 8-bit alpha with compression — typically achieving transparency images that are 20–30% smaller than equivalent PNG-24.

WebP vs JPEG vs PNG Comparison Table

Browser Support in 2026

WebP browser support is effectively universal for web applications:

• Chrome: Version 17+ (released 2012)
• Firefox: Version 65+ (released 2019)
• Safari: Version 14+ (released September 2020) — this was the last major holdout
• Edge: Version 18+ (released 2018)
• iOS Safari: Version 14+ (released September 2020)
• Android Chrome: Full support

Global coverage: ~99% as of 2026. The only browsers that don't support WebP are Internet Explorer (which accounts for <0.3% of global traffic and is officially retired) and very old Safari versions (iOS 13 and earlier).

The practical implication: For virtually all new web projects, you can serve WebP without fallback and reach essentially your entire audience. If you need to cover iOS 13 or older, use the "picture" element with a JPEG/PNG fallback.

When to Switch to WebP and When Not To

Switch to WebP for:

• Any new web project where you control the image pipeline
• Hero images and large photographs (25-35% size reduction is significant at scale)
• Images with transparency (WebP is smaller than PNG and better than JPEG-with-mask)
• Animated content (WebP animated is 64% smaller than GIF)

Stick with JPEG for:

• Email images — email client WebP support is poor. Outlook, Gmail (web mostly fine, but native clients vary), Apple Mail all vary. JPEG is the safe choice for email.
• APIs that expect JPEG input — some third-party services require specific formats
• Images that need to open in older desktop software — Photoshop versions before 2019 needed a plugin

Stick with PNG for:

• Images requiring lossless precision in environments where you're not sure WebP is supported
• Internal workflow where files will be re-edited — keep masters as PNG, export to WebP for web

The bottom line: For web delivery, WebP is almost always the right choice in 2026. The exceptions are narrow and specific.

How to Convert JPG to WebP

Converting a JPEG to WebP takes seconds using a browser-based tool. No software installation, no upload required.

Step 1: Open the JPG to WebP converter below.

Step 2: Drop your JPEG file onto the upload area or click to select it.

Step 3: Adjust the quality slider. 80% WebP is approximately equivalent to 90% JPEG in perceived quality. Start at 80% and check the preview.

Step 4: Click Download to save the WebP file.

The converted file will typically be 25–35% smaller than the original JPEG at equivalent quality. If you are converting multiple images, process them one at a time — each conversion runs independently in your browser.

How to Convert PNG to WebP Preserving Transparency

WebP supports full alpha channel transparency, so PNG images with transparent backgrounds convert perfectly. The transparency is preserved in the WebP output.

For lossless output (identical quality, just smaller): Use WebP lossless mode. The output will be ~26% smaller than the PNG on average, with identical pixel values.

For lossy output with transparency: Use WebP lossy at quality 80-85. The image content will be compressed with slight quality loss, but the transparency channel is preserved. This is appropriate for product photos with white background replacement or any image where the transparency shape is more important than pixel-perfect interior quality.

One edge case: Semi-transparent pixels (pixels with alpha values between 0 and 255, used for anti-aliasing and soft shadows) are preserved in WebP. If your PNG has soft shadow edges, they will appear correctly on any background in the WebP output — unlike a JPEG where those shadows would be white or black.

Serving WebP on Your Website

For browser-compatibility when you need to support older browsers, use the HTML "picture" element:

Example HTML using the picture element:

<picture>

<source srcset="image.webp" type="image/webp">

<img src="image.jpg" alt="Description">

</picture>

Browsers that support WebP use the "source" element. Others fall back to the "img" element automatically. No JavaScript needed.

For AVIF + WebP + JPEG triple serving:

Example HTML for AVIF + WebP + JPEG fallback:

<picture>

<source srcset="image.avif" type="image/avif">

<source srcset="image.webp" type="image/webp">

<img src="image.jpg" alt="Description">

</picture>

CDN-based automatic conversion: Cloudflare, Cloudinary, and most modern CDNs can detect the browser's Accept header and automatically serve WebP when supported, falling back to JPEG/PNG. This approach serves the right format without managing multiple file versions — recommended for any high-traffic site.