Image formats
JPG vs PNG: Differences in Quality, File Size, and Transparency
By Zipixel ·
The main differences between JPG and PNG are their compression methods and support for transparent backgrounds. Consider JPG when you want smaller photo files for sharing, and PNG when you need transparency or sharp text and lines.
However, PNG does not always look better, and JPG does not always produce a smaller file. The results depend on the image content and export settings. This guide explains the differences and helps you choose the right format.
This guide is available in Korean and English. 한국어 · English
JPG vs PNG: A Quick Comparison
| Feature | JPG (JPEG) | PNG |
|---|---|---|
| Compression | Typically lossy | Lossless |
| Image quality | Some detail may be lost depending on compression settings | Preserves pixel information when saved |
| File size | Often more efficient for photographs | Can produce large files for complex photographs |
| Transparent backgrounds | Not supported | Supported |
| Common uses | Portraits, landscapes, and product photos | Transparent logos, text-heavy screenshots, and graphics |
| Key limitation | Repeated recompression can cause cumulative quality loss | Cannot restore detail already lost through JPG compression |
What Is JPG?
JPG is a widely used format for storing and sharing photographs. The .jpg and .jpeg extensions refer to the same format. The extension alone does not affect image quality.
Typical JPG compression is lossy: it reduces information that is less noticeable to the human eye. Adjusting the export quality lets you balance visual quality and file size, making JPG useful for photographs with rich colors and gradual tonal changes.
Heavy compression can blur fine details, such as hair, or create visible artifacts around text and edges. If your image contains small text, inspect the exported file at a larger viewing size.
What Is PNG?
PNG is an image format that uses lossless compression. It also supports transparency, making it useful for logos without backgrounds, icons, and graphics with fine lines or text.
For example, consider PNG when placing a transparent logo on different backgrounds or preserving small text in a software screenshot.
Lossless means that pixel information is preserved during saving. It does not make a blurry original sharper or recover details already removed by JPG compression.
For more information about compression and transparency, see the MDN image format guide.
How Do JPG and PNG Compare in Quality and File Size?
Image Quality: Compare the Same Source Image
When exported from the same source, PNG preserves pixel information, while JPG discards some information depending on the quality setting.
That does not mean the difference will always be obvious. A JPG saved at an appropriate quality level may look very similar to the original at its normal display size.
When comparing files, inspect fine textures, text edges, thin lines, and smooth color gradients.
File Size: JPG Often Works Better for Photos
Photographs with complex colors and textures, such as portraits and landscapes, can often be compressed efficiently as JPG files. Saving the same photograph as PNG may produce a larger file.
PNG can be efficient for graphics with simple colors and repeated areas, however. For a fair comparison, export both files at the same pixel dimensions, then compare their actual file sizes and visible quality.
Which Format Should You Use for Photos, Logos, and Screenshots?
| Use case | Format to consider first | Why |
|---|---|---|
| Travel, food, and portrait photos for a blog | JPG | Offers a useful balance between photo quality and file size |
| Product photos that do not need transparency | JPG | Helps balance upload size and visual quality |
| Logos and icons without a background | PNG | Preserves transparent areas |
| Screenshots containing small text | PNG | Preserves sharp text and line edges |
| Screenshots made up mostly of photographs | Compare JPG and PNG | The best result depends on the content |
If you plan to continue editing an image, keep the original or an editable project file. Rather than repeatedly recompressing an existing JPG, finish your edits from the original and export the final version.
What to Know Before Converting JPG and PNG
Converting JPG to PNG Does Not Restore Lost Quality
Details already removed by JPG compression cannot be recovered by converting the file to PNG. The conversion may simply create a larger file.
However, saving the converted image as PNG avoids additional lossy compression during subsequent PNG saves.
Converting a Transparent PNG to JPG Requires a Background
JPG cannot store transparency. When converting a transparent PNG to JPG, transparent areas must be combined with a background color. The result depends on the conversion tool and its settings.
A logo exported against a white background may show a visible white rectangle when placed on a dark page. If you need transparency, keep a format that supports it, such as PNG.
Use the image format converter to change formats, or the JPG image compressor to reduce file size while keeping the JPG format. After processing, check the file size along with text, edges, and backgrounds.
Consider WebP for Website Images
WebP is another option for images used on websites. It supports lossy compression, lossless compression, and transparency. Before choosing it, check whether your editing software or upload destination accepts the format. Learn more in Google’s WebP documentation.
Choose your options based on the image content, whether transparency is required, and your file size limits. Then compare the exported results.
Frequently Asked Questions
Is PNG Always Better Quality Than JPG?
PNG preserves pixel information when saved, but it does not always look better on screen. The visible difference depends on the source image, JPG quality settings, and display size.
Are JPG and JPEG Different Formats?
No. The .jpg and .jpeg extensions refer to the same image format. The extension itself does not create a difference in quality or file size.
Are PNG Files Always Larger Than JPG Files?
No. PNG files tend to be larger for complex photographs, but simple graphics may produce different results. Compare exports with the same pixel dimensions.
Does Converting JPG to PNG Make the Background Transparent?
No. Changing the format to PNG does not remove the existing background. You need to remove the background separately, then save the image with transparency preserved.