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Every image you save forces a choice: JPG, PNG or WebP? Pick the wrong one and you either get a huge file or a blurry, blotchy image. Here’s a practical guide to choosing the right format every time.
How they compress images
Lossy compression (JPG, and WebP in its usual mode) throws away detail that’s hard for the eye to notice, making files much smaller. Each time you re-save, a little more detail is lost.
Lossless compression (PNG, and WebP in lossless mode) keeps every pixel exactly. Files are bigger, but nothing is lost — which matters for sharp text and flat colours.
JPG (JPEG)
Best for: photographs, camera images, social media photos, online form uploads.
- ✅ Small files with adjustable quality
- ✅ Supported by every device, app and website
- ❌ No transparency
- ❌ Text and sharp edges get fuzzy “artifacts” at low quality
A JPG quality of 75–85% is usually indistinguishable from the original for photos while being a fraction of the size.
PNG
Best for: screenshots, logos, icons, charts, diagrams, images with text, and anything needing a transparent background.
- ✅ Lossless — perfect sharp edges and text
- ✅ Supports transparency
- ❌ Much larger files for photos (often 3–10× a JPG)
A screenshot of a spreadsheet saved as PNG stays crisp; saved as a low-quality JPG, the text becomes blotchy.
WebP
Best for: websites and apps where speed matters.
- ✅ Typically 25–35% smaller than JPG at similar quality, and smaller than PNG for graphics
- ✅ Supports both lossy and lossless compression
- ✅ Supports transparency (and animation)
- ❌ Not accepted everywhere — some upload forms, older software and email clients reject it
Quick decision guide
| You have… | Use |
|---|---|
| A photo for an online form | JPG |
| A photo for your website | WebP (or JPG) |
| A screenshot with text | PNG |
| A logo with a transparent background | PNG or WebP |
| A product image on white background for a store | JPG or WebP |
| An image you’ll edit further later | PNG (lossless) |
Common mistakes
Converting JPG to PNG to “improve quality”
Once a JPG has lost detail, converting it to PNG can’t bring it back. You’ll get the same image in a much bigger file.
Saving screenshots as JPG
Text and interface elements look smudged. Use PNG (or WebP lossless).
Using PNG for big photos on a website
A 2 MB PNG photo slows down your page. The same photo as JPG or WebP might be 150–300 KB. Faster pages also help with search rankings.
Transparent PNG converted to JPG
JPG has no transparency, so transparent areas become a solid colour (usually white). If you need transparency, choose WebP or keep PNG.
Website tip
If you run a website, serving images in WebP — at the size they’re actually displayed — is one of the easiest ways to improve loading speed. Keep the originals in case you need other formats later.
Convert in your browser
Our Image Converter turns JPG, PNG and WebP images into any of the three formats, in bulk, with a quality slider for JPG and WebP. Everything happens in your browser — your images aren’t uploaded.
Free toolTry the Image ConverterConvert images between JPG, PNG and WebP in bulk.Frequently asked questions
Which format should I use for online forms?
Almost always JPG, because most government and exam portals ask for JPG/JPEG specifically.
Does WebP work everywhere?
All modern browsers support WebP. Some older software, email clients and upload forms may not accept it, so keep a JPG or PNG copy when sharing outside the web.
What about HEIC photos from iPhones?
HEIC is very efficient but not widely supported outside Apple devices. Convert to JPG for sharing and uploading, or set your iPhone camera to 'Most Compatible'.
Written by the Toolsopedia team. Spotted an error? Tell us and we’ll fix it.