PNG, JPG and WebP all store images, but they make very different trade-offs between file size, image quality and features like transparency. Choosing the right one keeps your website fast, your emails deliverable and your graphics crisp — while the wrong choice bloats your pages or ruins your logos. This guide explains how each format works and gives you a clear rule for when to use which.
JPG (JPEG): built for photographs
JPG has been the workhorse of digital photography for decades. It uses lossy compression, meaning it permanently discards detail the human eye barely registers — subtle colour gradations, fine texture in shadows — to achieve very small files. For a photograph, this is a brilliant trade: a JPG is often five times smaller than the same image as a PNG with no visible difference.
JPG has two weaknesses. First, it cannot store transparency, so any transparent area is flattened to a solid colour (usually white). Second, because it is lossy, every time you re-save a JPG it loses a little more quality — so you should avoid editing and re-saving the same JPG repeatedly. Use it for photos that will be shared or displayed, not as a master editing format. Convert an image to JPG with the PNG to JPG Converter.
PNG: built for graphics and transparency
PNG uses lossless compression, so it reproduces every pixel exactly with no quality loss ever. That makes it the right choice for anything with sharp edges or flat colour: logos, icons, diagrams, screenshots and UI elements. Crucially, PNG supports full transparency, including soft edges — essential for a logo you want to place over any background.
The trade-off is size. Because it keeps everything, a photograph saved as PNG can be several times larger than the same photo as a JPG or WebP. Using PNG for photographs is the most common cause of a bloated, slow web page. The rule is simple: PNG for graphics and transparency, never for photos. If you have a photo that was saved as PNG, converting it can slash its size — and if you need transparency added, the JPG to PNG Converter handles the other direction.
WebP: the modern all-rounder
Developed by Google, WebP is the format designed to replace both JPG and PNG. It supports both lossy and lossless compression and transparency, and at the same visual quality it is typically 25–35% smaller than JPG or PNG. Because smaller images mean faster pages — which improves user experience and Core Web Vitals, a ranking factor — WebP has become the go-to format for performance-conscious websites.
For years the objection to WebP was browser support, but that is no longer an issue: every current version of Chrome, Firefox, Edge and Safari renders WebP. Unless you specifically need to support very old software, WebP is the best default choice for images on the web. Convert to it with the WebP Converter, which shows how much smaller each file becomes.
Head-to-head summary
- Compression: JPG lossy; PNG lossless; WebP both.
- Transparency: PNG yes; WebP yes; JPG no.
- File size (photo): WebP smallest, then JPG, then PNG (largest).
- Best for: JPG → photos with wide compatibility; PNG → logos, icons, transparency, sharp text; WebP → the modern web default.
Which should you actually choose?
Match the format to the job:
- A photograph on your website → WebP for the smallest size, or JPG if you need maximum compatibility.
- A logo, icon, screenshot, or anything with transparency → PNG, or lossless WebP if you want it smaller.
- The smallest possible file at good quality → WebP, every time.
- An image for a system that only accepts JPG or PNG → convert to whichever it requires.
The Image Format Converter lets you switch any image between PNG, JPG and WebP in bulk, showing the before-and-after size for every file, and it runs entirely in your browser so nothing is uploaded.
What about GIF and SVG?
Two other formats come up often and are worth placing on the map. GIF is an old, limited format restricted to just 256 colours — poor for photos, but still used for short looping animations. For anything static, PNG or WebP beats it easily, and for animation, a short video (MP4) or animated WebP is far smaller and sharper. SVG is different from all the others: it is a vector format that stores shapes as maths rather than pixels, so it scales to any size with zero loss and tiny file sizes. It is perfect for logos, icons and simple illustrations, but it cannot store a photograph. A good mental model is: photographs and complex images → JPG/WebP; graphics with flat colour and transparency → PNG/WebP; logos and icons that must scale crisply → SVG; short animations → WebP or MP4.
File size in practice
To make the differences concrete, take a typical 1200-pixel-wide photograph. As a PNG it might be around 2 MB. Saved as a good-quality JPG, the same image drops to roughly 300–400 KB with no visible difference. Converted to WebP at the same quality, it falls further to around 220–280 KB. Across a page with a dozen images, that is the difference between a page that loads in under a second and one that leaves visitors staring at blank rectangles — which directly affects bounce rate and search ranking. The format you choose is not a cosmetic decision; it is one of the cheapest, highest-impact performance wins available to any website.
A note on quality myths
Two misconceptions are worth clearing up. First, converting a JPG to PNG does not restore lost quality — JPG's compression is permanent, so a PNG made from it only preserves what remains, at a larger size. Second, PNG is not "higher quality" than JPG in a way that matters for photos; it is simply lossless, which only benefits graphics with sharp edges. For a photograph, a good-quality WebP or JPG looks identical to a PNG at a fraction of the size. After converting, you can shrink any file further with the Image Compressor.
Key takeaways
- JPG for photos (lossy, small, no transparency).
- PNG for logos, icons and transparency (lossless, larger).
- WebP is the modern default — smallest size, supports transparency, works everywhere.
- Converting JPG to PNG never restores quality; choose format by the job, not by a "quality" label.