JPG vs PNG vs WebP: Which Image Format Should You Use?
A clear comparison of the three most common image formats (quality, file size, transparency and compatibility) with practical recommendations.
Every time you save, upload or share an image, you are choosing a format. Often without realising it. Choose well and your images look sharp, load quickly and work everywhere. Choose badly and you end up with blurry logos, huge files or broken transparency. This guide explains the three formats you will use most: JPG, PNG and WebP.
JPG (JPEG): the photo format
JPG was designed in the early 1990s for photographs, and it is still the most widely supported image format in the world. It uses lossy compression: it analyses the image in small blocks and drops detail that human eyes are least sensitive to, such as subtle colour variations in textured areas.
Strengths
- Small files for photos. Often 10× smaller than an uncompressed image.
- Universal support in every device, browser, app and printer.
- Adjustable quality, so you can trade size for detail.
Weaknesses
- No transparency. Backgrounds are always solid.
- Sharp edges, text and flat colours can show blocky marks (fuzzy halos and blocks).
- Quality gets worse a little every time a JPG is edited and saved again.
Use JPG for: photographs, social media photos, email attachments and any picture with lots of natural detail.
PNG: the graphics format
PNG uses lossless compression: every pixel is preserved exactly. It also supports an alpha channelmeaning each pixel can be fully or partially transparent.
Strengths
- Perfect quality. No blocky marks, ever.
- Transparency, including soft edges and shadows.
- Excellent for flat colours, text, icons, logos, charts and screenshots.
Weaknesses
- Very large files for photographs. Often 5 to 10× bigger than JPG.
Use PNG for: logos, icons, screenshots, diagrams, images with text, and anything that needs a transparent background.
WebP: the modern all rounder
WebP was developed by Google to make the web faster. It supports both lossy and lossless compression, transparency and even animation. In typical tests, lossy WebP files are 25 to 35% smaller than JPGs of similar visual quality, and lossless WebP files are smaller than PNGs. All major browsers (Chrome, Safari, Firefox and Edge) support it.
Strengths
- Smaller files than both JPG and PNG.
- Transparency with lossy compression. Something JPG cannot do.
- Ideal for website performance and Core Web Vitals.
Weaknesses
- Some older desktop software, printers and upload forms still do not accept WebP.
Use WebP for: website images, online stores and blogs where speed matters.
Side by side comparison
| Feature | JPG | PNG | WebP |
|---|---|---|---|
| Compression | Lossy | Lossless | Both |
| Transparency | No | Yes | Yes |
| Best for | Photos | Graphics, text | Web images |
| Photo file size | Small | Very large | Smallest |
| Compatibility | Universal | Universal | Modern browsers |
Common mistakes
Saving photos as PNG
Screenshots of photos and phone images saved as PNG are often 5 to 15 MB. Converting them to JPG or WebP typically shrinks them by 80% with no visible difference. Use PNG to JPG or Convert Image.
Saving logos as JPG
Logos saved as JPG get fuzzy edges and lose their transparency, so they appear inside a white box on coloured backgrounds. Keep logos as PNG, WebP or, ideally, SVG vector files.
Converting JPG to PNG to “improve quality”
Converting cannot restore lost detail. JPG to PNG is useful when you want to edit without further loss or add transparency. Not to make a photo sharper.
Saving again JPGs repeatedly
Each save of a JPG compresses again. Keep an original and do your edits in a lossless format, then export a final JPG.
What about other formats?
- SVGvector graphics that scale infinitely; best for logos and icons on websites.
- GIFold format limited to 256 colours; still used for short animations.
- HEICApple’s efficient photo format; great on iPhone, but not widely supported elsewhere, so convert to JPG for sharing.
- AVIFnewer than WebP with even better compression; support is growing.
- BMP and TIFFlarge, mostly uncompressed formats used in specialist and legacy workflows.
Quick decision guide
- Is it a photograph? → JPG (or WebP for websites).
- Does it need transparency? → PNG (or WebP).
- Is it a logo, icon or diagram? → SVG if available, otherwise PNG.
- Is it a screenshot with text? → PNG.
- Is it going on a website? → WebPwith JPG/PNG fallback if needed.
Choosing the right format once saves storage, bandwidth and frustration. And makes your images look their best wherever they appear.