PNG vs JPG

Every time you export a design, save a screenshot or upload a photo, you get asked to pick a file format. Most people choose PNG or JPG without knowing why, then wonder why one photo looks blurry or one logo shows up with a white box around it instead of a clean edge. Here's what actually separates the two and when to use each one.

 

What is a JPG file

JPG (also written JPEG) is the standard format for photos online. It uses lossy compression, meaning it throws away a bit of image data every time you save the file to shrink it. The more you compress it, the smaller the file gets, but the more detail you lose. That trade-off is exactly why JPG dominates photography: photos are full of gradients and fine detail where a little data loss is barely noticeable, but the file size savings are huge.

 

What is a PNG file

PNG uses lossless compression. Nothing gets thrown away when you save it, so the image stays exactly as sharp as the original no matter how many times you edit and re-save it. PNG also supports transparency, so a logo or icon can sit with no background at all instead of a white rectangle behind it. That's why PNG is the default for logos, icons, screenshots, and any graphic with flat colors, sharp edges or text.

 

The real differences

Compression: JPG is lossy, PNG is lossless. This one choice explains almost everything else about the two formats.

File size: Because JPG throws data away, it produces much smaller files, especially for photos. PNG keeps everything, which makes it heavier. A PNG version of a photo can end up several times larger than the same photo saved as JPG.

Transparency: JPG has no support for transparent backgrounds at all, every JPG is a solid rectangle. PNG supports full transparency, including partial transparency like soft shadows fading into nothing, which JPG simply can't do.

Text and sharp edges: JPG compression works by smoothing out detail, so it's rough on straight lines and small text. Zoom into a JPG logo and you'll often see fuzzy edges or color bleeding, an effect known as compression artifacts. PNG keeps every edge crisp, which is why it's the standard for screenshots, UI mockups, and anything with text baked into the image.

 

Why do some files say .jpg and others .jpeg

No difference at all, same format. The short version exists because old Windows systems only allowed three-letter file extensions, so JPEG got trimmed to JPG. Once that limit disappeared, both spellings stuck around and are used interchangeably today.

 

Which one should you use

A simple rule covers almost every case:

• Photos, product shots, anything with lots of color and detail: JPG
• Logos, icons, illustrations, screenshots, anything that needs a transparent background: PNG
• Text-heavy graphics or designs with sharp edges: PNG
• Anything going on a website where load speed matters: JPG, unless transparency is non-negotiable

File size matters more than most people think. A page full of unnecessarily large PNGs loads slower, and slow pages lose visitors and rank worse on Google. Compress your PNGs when you can, or switch to JPG whenever transparency isn't required.

 

The short version

JPG sacrifices a bit of quality for a much smaller file. PNG keeps full quality and supports transparency, at the cost of a bigger file. Use JPG for photos, PNG for anything that needs to stay sharp or sit on a transparent background.