Choosing the right image format affects how good your images look, how fast your pages load, and how much storage and bandwidth you use. The three formats you'll encounter most are JPG, PNG and WebP — and each has a job it does best. This guide breaks down the differences in plain English so you always know which to reach for.
The Quick Answer
If you just want a rule of thumb: use WebP for the web whenever you can, JPG for photographs when WebP isn't an option, and PNG for graphics with transparency or sharp edges. Now let's look at why.
JPG (JPEG): The Photographer's Workhorse
JPG has been the standard for photographs for decades, and for good reason. It uses "lossy" compression, meaning it discards some image data to achieve small file sizes — and it does so cleverly, removing detail the human eye barely notices. This makes it excellent for photos with smooth colour gradients like skies, skin and landscapes.
Pros: small file sizes, universal support, great for complex photos.
Cons: no transparency, quality degrades each time you re-save, and sharp edges or text can look fuzzy.
Use JPG for photographs, hero images and any rich, colourful picture where a tiny loss of detail won't be noticed.
PNG: The Champion of Crispness and Transparency
PNG uses "lossless" compression, so it preserves every pixel perfectly. Crucially, it supports transparency, which is why it's the format of choice for logos, icons and graphics that need to sit on different backgrounds.
Pros: perfect quality, supports transparency, ideal for text, screenshots and graphics.
Cons: much larger files than JPG for photographs.
Use PNG for logos, icons, screenshots, illustrations with flat colours, and anything that needs a transparent background or razor-sharp edges.
WebP: The Modern All-Rounder
WebP is a newer format developed specifically for the web, and it's quietly become the best default choice. It supports both lossy and lossless compression and transparency, combining the strengths of JPG and PNG. Most importantly, it produces files roughly 25–35% smaller than JPG at the same visual quality.
Pros: smallest file sizes, supports transparency and animation, excellent quality, supported by all modern browsers.
Cons: not ideal for print workflows, and very old software may not open it.
Use WebP for virtually all website images — it's the single biggest easy win for page speed.
Side-by-Side Comparison
- Best for photos: WebP, then JPG
- Best for logos/graphics: WebP or PNG
- Transparency support: PNG and WebP (not JPG)
- Smallest file size: WebP
- Widest compatibility: JPG and PNG
- Lossless option: PNG and WebP
How to Convert Between Formats
Switching formats is simple and free. Our Image Converter lets you convert between JPG, PNG and WebP right in your browser — nothing is uploaded. A typical workflow is to design or photograph in your original format, then convert to WebP before publishing to the web. If you need to shrink dimensions too, run the file through the Image Resizer first, then the Image Compressor.
Does Image Format Affect SEO?
Indirectly, yes — and significantly. Smaller images load faster, and page speed is part of Google's Core Web Vitals ranking signals. Serving WebP instead of large JPGs or PNGs can measurably improve your load times and scores. Pair the right format with descriptive file names and alt text, and your images will help both your users and your rankings.
Final Thoughts
There's no single "best" image format — there's the best format for each job. Reach for WebP as your default for the web, fall back to JPG for photos where WebP isn't supported, and use PNG when you need flawless transparency or crisp graphics. Understanding these differences lets you keep your images looking great while loading fast. Try converting your next image to WebP and see how much smaller it gets.