If you have ever saved an image and hesitated over the format dropdown, you are not alone. JPG, PNG and WebP are the three formats you will meet most often on the web, and choosing the wrong one is the difference between a crisp logo and a blurry one, or a page that loads in half a second versus five. The good news: the rules are simple once you understand what each format was designed to do.
If you want the short version, here it is: use JPG for photographs, PNG for graphics that need transparency, and WebP for almost everything on a modern website. If you only remember one thing, remember that WebP usually gives you the smallest file at the same quality — and every current browser supports it. The rest of this article explains why, and when the exceptions apply.
JPG (also written JPEG) has been the default for photographs since the 1990s, and for good reason. It uses lossy compression, which means it intelligently discards image data your eye is unlikely to notice. The result is a small file that still looks great for photos with smooth gradients, skin tones and natural scenery.
The trade-off is that JPG does not support transparency, and it struggles with sharp edges. Save a logo with crisp text as a JPG and you will often see faint smudges — called compression artifacts — around the letters. JPG is also lossy every time you save, so re-editing and re-saving the same JPG repeatedly slowly degrades it.
Use JPG when: the image is a photograph, you do not need transparency, and small file size matters. A quality setting of 70–85% is the sweet spot for almost all web use.
PNG was designed to solve JPG's weaknesses. It uses lossless compression, so no quality is ever thrown away — every pixel is preserved exactly. Crucially, it also supports an alpha channel, meaning parts of the image can be fully or partially transparent.
This makes PNG the correct choice for logos, icons, screenshots, diagrams, and any graphic with sharp edges or text. The downside is file size: because PNG keeps every pixel, a photograph saved as PNG can be five to ten times larger than the same photo as a JPG. That is wasted bandwidth for an image where the quality difference is invisible.
Use PNG when: you need transparency, or the image has crisp lines, flat colors, or text that must stay perfectly sharp.
WebP, developed by Google, is the format that tries to give you the best of both worlds. It supports both lossy and lossless compression, it handles transparency like PNG, and it can even do animation like GIF. Most importantly, it produces noticeably smaller files than either JPG or PNG at equivalent quality.
In practice, a WebP image is typically 25–35% smaller than the same JPG, and dramatically smaller than the same PNG. On a content-heavy page, switching to WebP can shave seconds off load times. Every major browser — Chrome, Firefox, Safari, and Edge — has supported WebP for years, so compatibility is no longer a real concern for the vast majority of visitors.
Use WebP when: you are publishing to the web and want the smallest possible files without sacrificing quality. It is an excellent default for both photos and graphics.
A simple rule of thumb: if the image is going on a website, try WebP first. If you need a universally compatible file to email or hand off, fall back to JPG for photos and PNG for graphics.
Here is how the three formats stack up on the things that matter most:
You may still encounter GIF, but its only real advantage today is animation, and even there WebP and modern video formats do a better job at smaller sizes. For static images, GIF is limited to 256 colors and produces larger, lower-quality results than any of the three formats above. Reach for it only when you specifically need a simple, widely-supported animation.
The easiest way to see the difference is to try it yourself. Take a photograph and convert it to each format, then compare the file sizes — you will almost always find WebP wins. Our free Format Converter lets you switch between JPG, PNG, WebP and GIF instantly, right in your browser, with nothing uploaded to a server. If your file is still larger than you'd like, run it through the Image Compressor to squeeze it down further.
Choosing the right format is one of the highest-impact, lowest-effort things you can do for a faster, better-looking website. Once the rules click into place, it becomes second nature.