What Is PNG? Differences from JPEG and Its Pros and Cons Explained

PNG (Portable Network Graphics) is an image file format that allows you to without quality loss. It is widely used in situations where you want to keep text and fine details sharp, such as logos, icons, illustrations, and screenshots.

Unlike JPEG, which reduces file size at the cost of image quality, PNG uses a method called "lossless compression."One of PNG's biggest advantages is that image quality remains unchanged no matter how many times the file is saved. Additionally, because it supports "transparent backgrounds," it is an widely used image format for website design and image editing.

On the other hand, for photographs, the file size tends to be larger than JPEG, so many people wonder, "Should I use PNG or JPEG?" or "What is the difference between PNG and WebP?" In this article, we will explain the features and mechanics of PNG, differences from JPEG and WebP, advantages and disadvantages, and recommendations for each use case in an easy-to-understand manner for beginners.

What Is PNG?

PNG (Portable Network Graphics) is an image file format that uses "lossless compression" to save images without degrading quality. Developed in 1996 as an alternative to the GIF format, it is now widely used for a variety of purposes, including logos, icons, illustrations, and screenshots.

Instead of deleting part of the image data to reduce size like JPEG, it compresses while retaining the original image data, meaning the quality does not degrade even after repeated saving. Therefore, it is also suitable for purposes involving frequent editing, such as image editing and design creation.

Additionally, PNG supports "transparent images (alpha channel)" that allow you to make the background transparent. It is widely used for website logos, icons, and cropped images, and today almost all browsers and image editing software support the PNG format.

Features of PNG

Lossless Image Quality

The biggest feature of PNG is that the quality does not degrade no matter how many times you save it. Because it uses lossless compression rather than lossy compression like JPEG, you can maintain the original quality even if you re-edit and re-save an already saved image. This makes it highly suitable for image editing and design work.

Supports Transparent Backgrounds

PNG allows you to save images with transparent backgrounds. It is most commonly used in scenarios where you want to make the background transparent, such as logos, icons, and cutouts of people. Since JPEG cannot handle transparent backgrounds, this is a major advantage of PNG.

Sharp Text and Illustrations

PNG preserves fine lines, text, and shapes in a clean state. It is widely used for screenshots, presentation materials, and website button images because text remains crisp.

Broad Compatibility

PNG is natively supported by almost all operating systems, including Windows, macOS, iOS, and Android. It can also be used in browsers, image editing software, and office suites, making it an extremely compatible image format.

File Size Tends to Be Large for Photos

While PNG maintains image quality, its file size tends to be larger when it comes to photographs. Therefore, when saving landscape or portrait photos, JPEG or WebP can often reduce file size.

How PNG Works

PNG employs a compression method called "lossless compression." lossless compression is a technology that reduces file size without losing any image data, meaning the original image can be perfectly restored after decompression.

Understanding lossless compression

In lossless compression, the file size is reduced without changing the image quality at all by efficiently organizing and storing the image data. Therefore, the image will not degrade no matter how many times editing or saving is repeated. Not only photos, but also detailed images such as text and shapes can be saved sharply.

Why PNG Doesn't Lose Quality

PNG does not delete image information like JPEG does. Instead of discarding unnecessary information, it efficiently compresses and saves the same data so that when expanded, it returns to the exact same state as the original image. This mechanism allows it to maintain high-quality images.

Why PNG Files Are Larger

PNG does not delete image data in order to maintain quality. As a result, for complex images with many colors like photos, the file size tends to be larger than JPEG. On the other hand, for images with few colors, such as logos, icons, and illustrations, it can sometimes be saved with a relatively small file size.

What Is an Alpha Channel (Transparency)?

PNG can store transparency information called an "alpha channel." Since transparent and semi-transparent expressions are possible, logos, icons, and cropped images with transparent backgrounds can be displayed naturally. This is one of the reasons why PNG is widely used in web design and app development.

Differences Between PNG and JPEG

Both PNG and JPEG are representative image formats, but their compression methods, image quality, file sizes, and suitable use cases differ greatly. JPEG is Best for photographs, while PNG is suitable for saving logos, illustrations, and screenshots. By using them according to your purpose, you can optimize the balance between image quality and size.

① Compression Method

JPEG uses "lossy compression," which reduces file size by deleting some of the image information. On the other hand, PNG uses "lossless compression," allowing it to be saved without losing image data. A key feature of PNG is that the quality does not degrade no matter how many times it is saved repeatedly.

② File Size

For photos, JPEG can achieve smaller file sizes. On the other hand, while PNG tends to have a larger size to maintain quality, it can sometimes be stored efficiently for images with fewer colors, such as logos and icons.

③ Image Quality

PNG does not degrade in quality even after repeated saving. Because JPEG compresses the image when saving, editing and saving multiple times will gradually lower the quality. PNG is ideal for image editing and graphic design.

④ Transparent Background (Transparency)

PNG supports transparent images that allow you to make the background transparent. Since JPEG does not support transparency, PNG is frequently used for logos and cropped images.

⑤ Suitability for Photos

For photographs such as landscapes or people, JPEG is suitable because it can keep the file size down. On the other hand, PNG tends to produce larger file sizes when saving photos, so it is not highly recommended for photo usage.

Differences Between PNG and WebP

WebP is an image format developed by Google that offers higher compression efficiency than PNG. Like PNG, it supports transparent images, and its key feature is that it supports both lossy and lossless compression.

① File Size

WebP can often be saved with a smaller file size than PNG. For this reason, an increasing number of websites are using WebP to improve page loading speeds.

② Image Quality

Since PNG is lossless, it maintains the exact same quality as the original image. WebP also supports lossless compression, but you can reduce the file size even further by using lossy compression.

③ Transparent Background (Transparency)

Both PNG and WebP support transparent images. Either can be used for purposes such as saving logos, icons, or images with transparent backgrounds.

④ Animation

WebP also supports animated images. While PNG has an animated format called APNG, WebP or GIF are more commonly used for animations.

⑤ Suitability for Websites

On websites, WebP helps improve loading speeds because it can achieve smaller file sizes. On the other hand, PNG has very high compatibility and is still widely used today for images where quality is paramount, such as logos and icons.

When to Use and When Not to Use PNG

Although PNG is an extremely high-quality image format, it is not suitable for all images. By using it interchangeably with JPEG or WebP depending on the application, you can optimize the balance between image quality and file size.

Logos

PNG is ideal for logo images. Since the background can be made transparent, it can be placed naturally into various designs, such as websites and printed materials.

Icons

PNG is also suitable for icons used on websites and apps. It maintains a beautiful display because the outlines are sharp and it supports transparent backgrounds.

Illustrations & Charts

For images with distinct lines, such as illustrations, comics, and charts, PNG is recommended. Text and thin lines are less likely to blur, allowing them to be saved in high quality.

Screenshots

PNG is also well-suited for screenshots of computers and smartphones. Because fine text and UI designs can be saved sharply, it is adopted as the standard format by many operating systems.

Photos

For landscape or portrait photographs, JPEG or WebP is more suitable. While PNG is high quality even for photos, the file size tends to become large, which can increase storage usage and data transmission.

Social Media & Blogs

When posting photos to social media, JPEG is recommended. On the other hand, for text-heavy images like logos, banners, or explanatory graphics, PNG will display more sharply. It is important to choose according to the use case.

Advantages and Disadvantages of PNG

Advantages

• No quality loss (lossless compression)
• Supports transparent backgrounds (transparency support)
• Great compatibility with logos, icons, and illustrations
• Saves text and fine lines sharply
• Maintains quality no matter how many times the image is edited or saved
• Supported by almost all OS, browsers, and image editing software

Disadvantages

• PNG Files Are Usually Larger for Photos
• May consume more storage capacity than JPEG or WebP
• Can affect page loading speed on websites with large volumes of images
• JPEG is often more suitable for photo sharing

Tips for Saving PNG in High Quality

Although PNG inherently does not lose quality, by optimizing your saving and editing methods, you can maintain high-quality images while keeping file sizes down.

Use Appropriate Image Sizes

Saving an image that is larger than necessary will result in a larger file size. When using images for websites or social media, adjusting the image size to match the display dimensions can reduce file size.

Remove Unnecessary Transparency

For images that do not use transparency, removing the transparent portions can sometimes reduce the file size. If transparency is not required, saving it as a standard PNG is recommended.

Use PNG Compression Tools

Using a dedicated PNG compression tool allows you to reduce the file size while maintaining image quality. This is also effective when you want to improve website loading speeds without lowering image quality.

Ideal for Working Files

Since PNG does not degrade in quality when saved, it is suitable for files currently being worked on in image editing software. It is also recommended to convert it to JPEG or WebP after completion depending on the use case.

Best Use Cases for PNG

PNG is ideal for images where quality is paramount. It is superior to JPEG especially in scenarios involving text, shapes, and transparent images.

Logos & Icons

Because the background can be made transparent, it can be naturally integrated into various designs, such as websites and printed materials. PNG is widely used for corporate logos and app icons.

Screenshots

Since text and screen displays can be saved clearly, it has been adopted as the standard screenshot format in Windows and macOS.

Illustrations & Comics

Line art, anime illustrations, and diagrams can also be saved beautifully. It prevents the noise and blur that easily occur in JPEG.

Web Design

It is frequently used for images with transparent backgrounds, such as logos, buttons, banners, and icons. It is an indispensable image format for design production.

Presentation Materials

It is also suitable for diagrams and explanatory images used in PowerPoint, Google Slides, etc. Since text is displayed sharply, it excels in document creation.

Can PNG Be Used for Printing?

PNG can be used for printing, but its suitability depends on the application.

Logo Printing

Logos and illustrations can be printed in high quality using PNG. Since backgrounds can be made transparent, it is also used in design production.

Photo Printing

JPEG is common for printing photos. While you can print with PNG, its file size tends to be large, so JPEG is recommended by many photo printing services.

Print Resolution

For sharp prints, a resolution of around 300 dpi is generally recommended. Note that if you enlarge an image with insufficient pixels, it will become blurry even with PNG.

Differences Between PNG-8, PNG-24, and PNG-32

PNG comes in several types depending on the number of colors and transparency support. By using them according to your needs, you can optimize the balance between image quality and file size.

Today, PNG-32, which allows for transparent backgrounds, is the most widely used. It is standard to choose PNG-32 for logos, icons, and cropped images.

PNG vs. JPEG vs. WebP Comparison

PNG, JPEG, and WebP are image formats with different features. If you are unsure which format to choose, please refer to the comparison table below.

Which Format Should You Choose?

The optimal image format varies depending on the use case. Refer to the following table to make it easier to choose the right image format for your purpose.

History of PNG

PNG (Portable Network Graphics) was released in 1996. Because the widely used GIF format at the time had patent issues, PNG was developed as a freely usable alternative image format for everyone.

Subsequently, praised for its support for transparent images and high-quality lossless compression, it rapidly spread across websites, image editing software, and design production.

Today, PNG remains an indispensable image format for logos, icons, illustrations, and screenshots. While JPEG or WebP are often used for photos, PNG is still widely used for images where high quality must be maintained.

Frequently Asked Questions

Does PNG lose quality?

No. Because PNG uses lossless compression, the quality does not degrade even after repeated saving.

Which offers better image quality, PNG or JPEG?

PNG is the one that can maintain image quality. However, since JPEG can reduce the file size for photos, it is important to use them according to the application.

Is PNG suitable for photos?

Photos can be saved, but since the size tends to be larger than JPEG or WebP, JPEG or WebP are generally used for photographs.

Can PNG have a transparent background?

Yes. PNG supports transparent backgrounds (transparent images), so it is widely used for logos, icons, etc.

Can PNG be used for printing?

Yes, it can be printed. It is suitable for logos and illustrations, but JPEG is often recommended for photo printing.

When to Convert PNG to JPEG or WebP

Although PNG is high quality, depending on the application, it may be better to convert it to JPEG or WebP.

• Want to save or share photos → JPEG
• Need faster website loading → WebP
• Posting photos to social media → JPEG
• Want to keep file size as small as possible → WebP
• Want to edit while maintaining image quality → PNG

Summary

PNG is an image format that uses lossless compression to save images without degrading quality. Since the background can be made transparent, it is used for a wide range of purposes including logos, icons, illustrations, and screenshots.

• If quality is paramount, choose PNG
• For photos, choose JPEG
• For websites, choose WebP
• PNG is recommended for logos, icons, and illustrations
• It is important to use different image formats depending on the use case

Related Tools

• Convert Image to JPG : Convert PNG, WebP, AVIF, BMP, etc. to JPG
• Convert Image to PNG : Convert JPG, WebP, AVIF, BMP, etc. to PNG
• Convert Image to WebP : Speed up your site with next-generation format
• Convert Image to AVIF : Achieve high compression and high quality with next-generation image format

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