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WebP, JPEG or PNG: Choose by Image and Use

By Sourav Mahapatra · 26 July 2026 · 6 min read

Every few months someone reopens the format debate as though it were unsettled. It is mostly settled. The confusion survives because the advice online was written when the answer was genuinely different.

The rule: use WebP for almost everything, keep PNG only when you need it, and reach for AVIF when you are optimising hard. Everything below is why.

WebP already won the compatibility argument

Check format support in the browsers, image viewers and publishing systems your audience uses. WebP is a useful web option, while a handoff to a print workflow or older system may call for another format.

Savings depend on the source image and encoder settings. Compare actual bytes at acceptable quality; converting an already efficient image may offer little benefit or increase size.

When each format is actually right

• WebP: the default. Photographs, hero images, thumbnails, blog art, product shots. It handles both lossy and lossless, and it supports transparency, which is what makes it a genuine PNG replacement rather than just a JPEG one.
• PNG: when the pixels are the point. Screenshots with fine text, diagrams with hard edges, logos you will re-edit, anything where a compression artefact would be a defect rather than a nuisance.
• JPEG: compatibility and handoff. Photos going to a client, a print shop, an older system, or any place where you cannot control what opens the file. Universally understood, still fine.
• SVG: anything drawn rather than photographed. Icons, logos, charts. Infinitely scalable and usually tiny. Not a raster format, so it is not really in this contest.
• AVIF: compare the output. Test file size, visual quality, encoding time and support in your target workflow before choosing it.

Check dimensions and actual output size before choosing a format.

The bigger mistake is not the format

Converting a 4000 pixel wide photo to WebP gives you a smaller 4000 pixel wide photo. If it displays in a 600 pixel column, you are still shipping roughly forty times the pixels the layout will ever use.

Resize first, then convert, then compress. In that order. Getting the dimensions right beats every format argument, and it is the step people skip because it feels less technical.

A practical workflow

• Resize to the largest size it will actually display, then double it if you are serving high-density screens. Not more.
• Convert to WebP unless it is a screenshot full of small text, in which case keep PNG.
• Compress and eyeball the result at real size, not zoomed in. Artefacts you can only see at 400 percent are not artefacts your visitors will see.
• Set width and height in the HTML so the browser reserves space and the page stops jumping while images load.
• Lazy-load anything below the fold so it does not compete with the content people can actually see.

Why this matters beyond tidiness

Images can contribute to loading time, alongside scripts, fonts and server response. Identify the measured bottleneck first. The Core Web Vitals guide explains the metrics and limits.

Convert with the format converter, then squeeze what is left with the image compressor. Both run in the browser, so a folder of client photos never leaves your machine. Dedicated converters for each pair: JPG to WebP, PNG to WebP, WebP to JPG, WebP to PNG, PNG to JPG and JPG to PNG.

Questions people actually ask

Is WebP supported by all browsers in 2026?

Check the browsers and systems relevant to your audience. Do not assume that every browser, email client or downstream image workflow supports the same formats.

How much smaller is WebP than JPEG?

It depends on the image, dimensions and quality settings. Export comparable versions and measure their bytes rather than applying a fixed saving percentage.

Should I switch to AVIF instead?

Compare AVIF and WebP output for your own images and target systems. File size, quality, compatibility and processing time all matter.

When should I still use PNG?

When precision matters more than size: screenshots containing small text, diagrams with sharp edges, and source images you intend to edit again. PNG is lossless, so nothing degrades.

Does converting to WebP lose quality?

Lossy WebP discards some data, like JPEG, but usually less visibly at the same file size. WebP also has a lossless mode if you need an exact reproduction with transparency.

Written by Sourav Mahapatra, who builds BeginThings: free browser tools and BeginRooms, a 3D workspace you can walk through. Take the 30-second tour or start a free 11-day trial, no card needed.