JPEG vs PNG: A Complete Comparison | Quality, File Size, and Use Cases Explained

Have you ever wondered whether to use JPEG or PNG when saving an image? Both are widely used image formats, but they have very different characteristics. Some formats are better suited for photos, while others are better for logos and illustrations.

Choosing an image format that doesn't match your use case can lead to reduced quality or an unnecessarily large file size. That's why understanding the difference between JPEG and PNG is essential when working with images.

What Is JPEG?

JPEG (Joint Photographic Experts Group) is the most widely used image format for saving photos. Its file extension is ".jpg" or ".jpeg," and it's the standard format used across most smartphones, digital cameras, and computers.

JPEG uses a compression method called lossy compression. Compressing image data reduces file size, but as a trade-off, quality gradually degrades a little each time the file is saved.

Because it achieves a high compression ratio for images with many colors, such as landscape or portrait photos, it's widely used on websites and social media as well.

Advantages of JPEG

• Easy to save photos at a high quality
• Relatively small file size
• Supported by an extremely wide range of devices
• Easy to use for email and social media

Disadvantages of JPEG

• Quality degrades with repeated saving
• Can't make the background transparent
• Text and illustrations are prone to noise artifacts

What Is PNG?

PNG (Portable Network Graphics) is an image format that preserves high quality when saving. Unlike JPEG, it uses lossless compression, so quality doesn't degrade no matter how many times the file is saved.

PNG's biggest feature is its ability to make the background transparent. It's widely used for logos, icons, illustrations, and screenshots.

On the other hand, saving a photo as a PNG tends to result in a large file size, so JPEG is often better suited for photo use cases.

Advantages of PNG

• No quality degradation
• Can make the background transparent
• Text and shapes stay sharp
• Well suited for image editing

Disadvantages of PNG

• File size tends to be larger than JPEG
• File size tends to grow for photos
• Can affect page loading speed on websites

Differences Between JPEG and PNG

JPEG and PNG are both widely used image formats, but they differ significantly in their compression method and intended use. JPEG is well suited for photos, while PNG is better for logos, illustrations, and images that need a transparent background. Let's take a closer look at the differences between the two.

① Quality Differences

Because JPEG uses lossy compression, quality degrades slightly each time it's saved. PNG, on the other hand, uses lossless compression, so quality doesn't change no matter how many times it's saved. This makes PNG well suited for images that are edited repeatedly or images that contain text.

② File Size Differences

JPEG can compress photos efficiently, resulting in a smaller file size than PNG. When posting photos to a website or social media, choosing JPEG can help reduce bandwidth usage. PNG, on the other hand, preserves high quality but tends to result in a larger file size.

③ Transparent Background Support

PNG supports an "alpha channel," which allows the background to be made transparent. This is useful when placing a logo or icon on a webpage, or when layering images on top of each other. JPEG doesn't support transparent backgrounds, so the background is always saved as a solid color.

④ Compatibility With Photos

JPEG excels at images with many colors, such as landscape or portrait photos. It's the standard format used in many digital cameras and smartphones because it can maintain sufficient quality while keeping file size small. Saving a photo as a PNG results in high quality, but the file size can become extremely large.

⑤ Compatibility With Illustrations and Logos

PNG is recommended for images with clear outlines, such as text, logos, and illustrations. With JPEG, outlines can become blurry or develop fine noise artifacts during compression. That's why PNG is commonly used for company logos, banners, and screenshots.

⑥ Suitability for Editing

PNG is well suited if you plan to edit and save an image repeatedly. JPEG isn't ideal for repeated editing since quality degrades a little each time it's saved. JPEG is convenient for distributing a finished photo or posting it on a website.

JPEG vs PNG Comparison Table

Not Sure Which to Choose?

Recommendations by Use Case

JPEG Is Recommended for Photos

JPEG is recommended for travel photos, landscapes, and portraits. It's the easiest image format to work with, thanks to its small file size and support across a wide range of devices and services.

PNG Is Recommended for Logos and Icons

Since it can make the background transparent, PNG is ideal for company logos, icons, and YouTube thumbnail assets. Since quality doesn't degrade, it's also well suited for storing design data.

Which One for a Website?

JPEG is well suited for pages that feature photos. For logos and button images, on the other hand, using PNG helps maintain a sharp display. Note that more websites today convert JPEG or PNG images to WebP for use.

Which One for Social Media Posts?

JPEG is the common choice when posting photos to Instagram, X (formerly Twitter), or Facebook. If you're creating an image with text or an illustration, using PNG helps keep the text sharp and free of blurring.

Frequently Asked Questions

Does converting JPEG to PNG improve image quality?

No. Once quality has been lost through JPEG compression, it can't be restored. Converting a JPEG to PNG will prevent any further quality loss when saving, but it won't result in higher quality than the original JPEG.

What happens when you convert PNG to JPEG?

Converting a PNG to JPEG often reduces file size, but since JPEG uses lossy compression, quality degrades slightly. Also, any transparent background in the PNG can't be preserved in JPEG — it will be saved with a solid background color instead.

Can JPEG and PNG be converted into each other?

Yes, they can be converted. However, converting JPEG to PNG won't improve quality, and converting PNG to JPEG may cause a slight loss of quality. It's important to use the right format for your specific use case.

Which is recommended for use on a website?

JPEG is recommended for photos, and PNG is recommended for logos and icons. Today, more websites convert JPEG or PNG images to WebP in order to improve loading speed.

Which is better for printing, JPEG or PNG?

For general printing, JPEG offers sufficient quality. However, for printing text or logos, or when you need to preserve high quality, formats like PNG or TIFF are more suitable.

Summary

JPEG and PNG are both widely used image formats, but each excels in different use cases.

• Use JPEG for photos
• Use PNG for logos, illustrations, and images with text
• Use PNG when you need a transparent background
• Use JPEG when you want to reduce file size
• Use PNG when you'll be editing repeatedly

By choosing the right image format for your use case, you can optimize quality, file size, and ease of editing. If you're ever unsure which format to choose, remembering the basics — "JPEG for photos" and "PNG for logos and illustrations" — will help you avoid most mistakes.

Related Tools

If you'd like to convert an image format, feel free to use HaruTools Lab's free online tools.

• Convert Images to JPG: Convert PNG, WebP, AVIF, BMP, and more to JPG
• Convert Images to PNG: Convert JPG, WebP, AVIF, BMP, and more to PNG
• Convert Images to WebP: Speed up your site with a next-generation format
• Convert Images to AVIF: Achieve high compression and high quality with a next-generation format

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