If you've ever saved an image and had to choose between JPG, PNG, and WebP, you've probably just picked one and moved on. Most people do. But the format you choose actually matters — it affects file size, image quality, and whether things like transparent backgrounds work at all. Here's what you actually need to know.
Before getting into the details, here's the quick version:
That covers about 90% of situations. If you want to understand why, keep reading.
JPG has been around since 1992 and is still the most common image format on the internet. It works by discarding some image data that the human eye is least likely to notice — this is called lossy compression. The result is a small file that looks nearly identical to the original. The trade-off is that every time you save a JPG, you lose a little more data. Save the same JPG ten times and you'll start to see it.
JPG has no support for transparency. If you need a background that you can see through, JPG isn't the right choice. It also handles sharp edges and text poorly — you'll see blurring and artifacts around high-contrast areas. For those use cases, PNG is better.
PNG uses lossless compression, meaning no image data is discarded. What you save is exactly what you get back. This makes PNG ideal for anything where accuracy matters: logos, icons, screenshots, graphics with text, and images with transparent backgrounds.
The downside is file size. A PNG photo will be significantly larger than the same photo saved as JPG — sometimes 3–5x larger. For photographs, that's a bad trade-off. For a logo with a transparent background, it's the only sensible choice.
WebP was developed by Google and released in 2010, but it took years to gain real traction. It supports both lossy and lossless compression, transparency, and even animation. It produces files that are roughly 25–35% smaller than JPG at equivalent quality, and significantly smaller than PNG for lossless images.
WebP is now supported by all major browsers — Chrome, Firefox, Safari (since 2020), and Edge. If you're publishing images on a website, WebP is worth considering. Most website builders and CMS platforms can handle it. The main situation where WebP still causes friction is older software that hasn't been updated to handle newer formats.
| Feature | JPG | PNG | WebP |
|---|---|---|---|
| Compression type | Lossy | Lossless | Both |
| File size (photos) | Small | Large | Smallest |
| Transparent backgrounds | No | Yes | Yes |
| Best for photos | Yes | No | Yes |
| Best for logos / graphics | No | Yes | Yes |
| Universal software support | Yes | Yes | Most modern apps |
| Animation support | No | Limited (APNG) | Yes |
| Browser support | All | All | All modern |
Convert to JPG when you're sharing photos via email, messaging apps, or social media, and file size matters. Most platforms will compress your images anyway, so a JPG at 80–85% quality is a reasonable starting point. Don't convert logos, screenshots, or anything with text to JPG — the compression artifacts will be obvious.
Convert to PNG when you need a transparent background — for example, a product photo with the background removed, or a logo that needs to sit on different colored backgrounds. PNG is also the right call if you're doing image editing and don't want to lose quality across multiple saves.
Convert to WebP when you're optimizing images for a website. Smaller files load faster, and page load speed directly affects search rankings and bounce rates. A quick batch conversion of your site's images to WebP is one of the easier performance wins available.
If you're converting from one format to another, the starting format matters for quality. Converting from a high-quality JPG to WebP will produce a good result. Converting from a PNG to JPG will discard the transparency and apply lossy compression — fine for photos, not great for graphics.
One conversion that almost always makes sense: if you have very large PNG photos (not graphics — actual photographs saved as PNG), converting them to JPG or WebP will dramatically reduce file size with no meaningful quality loss to the human eye.
HEIC is the format iPhones use by default. It's actually excellent — better compression than JPG at similar quality — but it's not universally supported. If you're getting HEIC files from your iPhone and need to use them on Windows, Android, or upload them anywhere, you'll need to convert them first. A separate article covers what HEIC is and how to convert it.
ConvertoFile's image converter handles all three formats with batch support. Your files never leave your browser — nothing is uploaded anywhere.
Open Image ConverterJPG is the safe default for photos. PNG is the right choice when you need transparency or lossless quality. WebP is the smart choice for the web if your audience is using modern browsers, which at this point is almost everyone.
If you're unsure, JPG gets the job done in most cases. If you're building or maintaining a website, it's worth taking the time to convert your images to WebP — the file size savings are real and the browser support is there.