JPG vs PNG vs WebP: Which Image Format Should You Actually Use?

Every image format is a different trade-off between file size, quality and features such as transparency and animation. Picking the wrong one is among the most common reasons a website loads slowly, a logo shows an ugly white box on a coloured background, or a screenshot comes out blurry. This guide explains how JPG, PNG and WebP actually differ, gives a quick decision guide, and covers the mistakes that cost the most quality.

Lossy vs lossless: the one idea that explains everything

Image formats compress in one of two ways. Lossless compression stores every pixel exactly. Decompress the file and you get back precisely what went in. Lossy compression throws away detail the eye is unlikely to notice in exchange for much smaller files. Photos hide lossy compression well because they are full of noise and gradual colour changes. Text, sharp lines and flat colour expose it immediately as smudgy halos and blocky artefacts.

Lossy damage also compounds. Every time you open a JPG, edit it and save it as JPG again, a little more detail is discarded. Keep an original and export copies from it, rather than re-saving the same file over and over.

JPG (JPEG)

Best for: photographs and anything with lots of colour gradients, such as portraits, product shots and landscapes.

JPG is lossy and has been the default photo format for three decades, so every device, app and upload form accepts it. At sensible quality settings (around 75–85%), photos look identical to the original at a fraction of the size.

Weaknesses: no transparency, and it handles sharp edges badly. A screenshot or logo saved as JPG picks up faint grey fuzz around text and lines. That is why it is the wrong choice for diagrams, interface screenshots and anything with lettering.

PNG

Best for: logos, icons, screenshots, diagrams, charts, and anything that needs a transparent background.

PNG is lossless. Edges and text stay perfectly crisp, and it supports full transparency, including soft semi-transparent edges such as shadows. If you have ever seen a logo sitting in a white rectangle on a coloured page, it should have been a transparent PNG.

Weaknesses: photos saved as PNG are huge, often five to ten times larger than a good JPG, with no visible benefit. PNG is for graphics, not photos.

WebP

Best for: almost everything on a modern website.

WebP, developed by Google, supports both lossy and lossless compression, transparency and animation in one format. Google's own comparisons found lossy WebP files about 25–34% smaller than JPGs of the same visual quality, and lossless WebP about 26% smaller than PNG. Every current browser supports it.

Weaknesses: outside the browser, support is still patchy. Older versions of desktop software, some email tools, print services and upload portals only accept JPG and PNG. That is why "my WebP was rejected" is a common problem, and converting to JPG or PNG is the standard fix.

Quick decision guide

What about GIF, AVIF and SVG?

• GIF is limited to 256 colours and is really only still used for short animations. Animated WebP or a short video does the same job at a fraction of the size.
• AVIF compresses even better than WebP and is supported by current browsers, but software support outside the browser lags further behind. It is worth considering for large photo-heavy sites.
• SVG isn't a pixel format at all. It describes shapes mathematically, so logos and icons stay sharp at any size. If a designer can give you an SVG of your logo, use it on the web.

How to convert between formats

You don't need design software to switch formats. The Image Converter reads JPG, PNG, WebP and BMP and converts between them in your browser, so the image never leaves your device:

1. Add the image you need in another format.
2. Choose the target: PNG for transparency, JPG for small photos, WebP for the web, BMP only for legacy software.
3. Convert and download. The new file is generated on your device in moments.

For one specific direction, the dedicated converters such as WebP to JPG, PNG to JPG and JPG to WebP skip the format choice entirely.

Mistakes that cost the most quality

• Converting to JPG and losing transparency. JPG has no transparency, so transparent areas are filled with a solid colour, usually white. That cannot be undone from the JPG. Keep the PNG original.
• Expecting PNG to restore quality. Converting a blurry JPG to PNG preserves the blur perfectly in a much bigger file. Conversion never adds detail that isn't there.
• Uploading full-size photos to a website. A 4,000-pixel-wide phone photo displayed 800 pixels wide wastes most of its bytes. Resize it to the size it is shown at, then compress it.
• Chaining lossy conversions. JPG to WebP to JPG loses detail at every lossy step. Always convert from the best original you have.

Frequently asked questions

Is WebP better than JPG?

For websites, yes: smaller files at the same quality, plus transparency. For files you send to other people or other software, JPG is still the safer choice because everything opens it.

Does converting PNG to JPG reduce quality?

Yes, slightly, because JPG is lossy, and any transparency is flattened. For photos the difference is usually invisible. For screenshots and graphics it can be noticeable, so keep them as PNG.

Which format is best for printing?

Print services usually want high-resolution JPG or PNG, and some accept TIFF or PDF. Resolution matters more than format: aim for 300 pixels per inch at the printed size.

How do I make an image file smaller without changing format?

Use the Image Compressor, which reduces file size within the same format. Our guide to compressing images without losing quality covers it in detail.