JPG vs PNG vs WebP vs AVIF: Which Format Should You Use?
Four formats, one decision, and it depends entirely on what's in the image and where it's going. Here's the short version, followed by the reasoning behind it.
Quick Decision Guide
| If your image is... | Use |
|---|---|
| A photo (people, scenery, food) | JPG |
| A logo, icon, or screenshot with text | PNG |
| Anything going on a website | WebP |
| You want the smallest possible web file | AVIF (where supported) |
| Needs a transparent background | PNG (or WebP, which also supports transparency) |
JPG — The Default for Photos
JPG uses lossy compression tuned specifically for photographic detail — gradients, natural textures, subtle color variation. It's universally supported (every device, every platform, every form portal) and produces the smallest files for photo content specifically. The tradeoff: it's not great for flat-color graphics, sharp text, or anything needing transparency — compressing a screenshot as JPG often introduces visible artifacts around text edges.
PNG — Best for Graphics and Transparency
PNG is lossless — nothing is discarded, ever. That makes it ideal for logos, icons, screenshots, and anything with sharp edges or text, where JPG's compression artifacts would be visible. The cost is file size: a PNG of a photo is often 3-5× larger than the same photo as JPG, for no visible quality benefit.
WebP — The Modern Web Default
WebP (developed by Google) supports both lossy and lossless compression, transparency, and produces smaller files than JPG or PNG at equivalent visual quality — typically 25-35% smaller than JPG for photos. It's supported in all modern browsers, which is why it's become the default recommendation for website images where page load speed matters.
AVIF — The Newest, Smallest Option
AVIF pushes further than WebP, often producing files 20-30% smaller still at similar quality. Browser support has grown significantly but isn't universal — check your audience's browser mix before relying on it exclusively, and keep a JPG/WebP fallback for compatibility.
What About Forms and Portals?
For government forms, job applications, and most upload portals: stick to JPG unless the form specifically states otherwise. These systems are built around JPG as the expected format, and PNG/WebP/AVIF uploads are more likely to be rejected outright, even if the platform's stated requirement doesn't explicitly forbid them.
Frequently Asked Questions
Can I just convert any format to any other format?
Yes — but converting a lossy format (JPG) to another lossy format doesn't recover quality already lost; and converting a photo to PNG makes it larger without adding quality back. Convert based on where the file needs to go, not to "upgrade" it.
Is WebP good enough to replace JPG everywhere?
For websites, generally yes. For forms, portals, and general sharing, JPG remains the safer universal choice since not every system handles WebP correctly.
Does AVIF work on all browsers?
Most current browsers support it, but some older browsers and specific apps/platforms don't — always check your specific audience before making it your only format.