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

What actually separates the three formats

JPG (also written JPEG) is lossy. It shrinks a file by throwing away detail your eye is unlikely to miss, which makes photographs tiny — but it softens sharp edges and text, and it cannot store transparency at all. Every JPG pixel is fully opaque.

PNG is lossless. It keeps every pixel exactly as it was, so hard edges, flat colour and fine text stay perfectly crisp, and it supports a transparent background. The price is size: because it discards nothing, a photographic PNG is often several times larger than the same image saved as JPG.

WebP is the modern format that does both jobs. It can be lossy or lossless, it keeps transparency like PNG, and it is markedly smaller than either at the same visible quality. Its only real weakness is age: every current browser reads it, but some older desktop programs and upload forms still do not.

Use JPG for photographs

JPG is built for continuous-tone images — photographs, gradients, anything with smooth transitions between colours. For that kind of content it produces the smallest files of the three with no difference you can see at normal viewing sizes, which is why nearly every camera and phone saves photos as JPG by default.

Where it falls down is sharp detail. Convert a screenshot full of text, or a logo with clean edges, to JPG and you will see a faint halo around the edges and slightly mushy letters. That happens because JPG compresses the image in small blocks, and hard edges are exactly what that approach handles worst.

The simple rule: if it came out of a camera, JPG is almost always the right choice for sharing, emailing and uploading. If it is a graphic, keep it out of JPG.

Use PNG for graphics, text and transparency

PNG is lossless, so it reproduces hard edges and flat colour perfectly. That is why screenshots, logos, icons, charts and diagrams belong in PNG — they stay sharp at any zoom, with no compression fuzz around the lines. It is also the format to reach for whenever you need a transparent background, something JPG simply cannot do.

The catch is file size. Because PNG keeps every pixel, a photograph saved as PNG is large — sometimes several times the size of the JPG for no visible benefit. And converting a photo to PNG never improves it: you get a bigger, pixel-for-pixel copy of what the JPG already looked like, artefacts and all. PNG cannot recover detail that was thrown away earlier.

The rule here mirrors the last one: if the image has text, sharp lines, or needs to be transparent, use PNG.

Use WebP for the web

WebP typically produces files 25 to 35 percent smaller than JPG at the same visible quality, and it keeps transparency like PNG. That combination — small and transparent — is why it has become the default for fast-loading websites. Lighter images mean quicker pages and less data for your visitors, and page speed is one of the signals search engines weigh when ranking.

The trade-off is compatibility. Every browser in current use reads WebP, so anything displayed on a web page is safe. The gap is outside the browser: a few older applications, some phones and the occasional upload form still reject it. The practical approach is to use WebP for the web and keep a JPG or PNG copy for the rare program that refuses it.

So if you are preparing images for your own site, convert them to WebP — it is close to a free win. If you are sending a file to someone whose software you cannot predict, JPG is the safer bet.

Converting without wrecking the image

The single most common mistake is converting a transparent PNG to JPG and ending up with black or white boxes where the see-through areas used to be. Because JPG has no transparency, that area has to be filled with something — a careful converter fills it clean white, a careless one leaves it black. If you need to keep the transparency, convert to WebP or another PNG, never to JPG.

A few more things worth knowing before the quick guide below:

• Converting JPG to PNG will not restore quality — the detail a JPG discarded is gone; you just get a larger, lossless copy for editing.
• Only lossy targets (JPG and WebP) have a quality slider. PNG is always lossless, so there is no quality setting to choose.
• Convert on your own device rather than uploading. An image processed in your browser is never transmitted, which matters for anything private like an ID photo or a signature.

The ten-second decision guide

If you remember nothing else, remember this: match the format to the content, not to habit. Photographs want JPG; graphics and transparency want PNG; the web wants WebP. When you do need to switch, the direction of the conversion matters as much as the format you land on.

• A photo to share or email → JPG.
• A screenshot, logo, icon or anything with transparency → PNG.
• An image going onto a website → WebP.
• A transparent image that must stay transparent → PNG or WebP, never JPG.
• Any of the above → convert it in your browser so the file never leaves your device.

Tools mentioned in this guide