What is PNG?
PNG (Portable Network Graphics) is a lossless image format that supports transparency. Learn what PNG files are, how they compare to JPG and WebP, and when to use them.
PNG is a raster image file format that uses lossless data compression — meaning no image quality is lost when the file is saved. It was created in 1996 as an improved, patent-free replacement for GIF. PNG is the go-to format for images that require transparency, sharp edges, text, or screenshots, where quality preservation is essential.
Key Features of PNG
• Lossless compression — saving the file never degrades quality • Alpha transparency — supports a full 256-level transparency channel (RGBA) • True color — supports 24-bit color (16 million colors) and 48-bit deep color • No color limit — unlike GIF which is limited to 256 colors • Better compression than GIF for photographs, though larger than JPG • Supports metadata and embedded color profiles
PNG vs JPG vs WebP
• PNG — Lossless, supports transparency. Best for logos, icons, screenshots, text images. Larger file size than JPG for photos. • JPG — Lossy compression. Best for photographs. Smaller files than PNG, but no transparency and quality degrades with each save. • WebP — Modern format supporting both lossless and lossy. Typically 25–35% smaller than PNG/JPG at equivalent quality. Best choice for web images when supported. • GIF — Limited to 256 colors, supports animation. PNG supersedes GIF for static images.
When to Use PNG
Choose PNG when: • The image has a transparent background (logos, icons, UI elements) • The image contains sharp lines, text, or geometric shapes • You need to edit and re-save the image multiple times without quality loss • Screenshots of UI or code • Images with few colors or large flat areas Use JPG instead for photographs without transparency, and WebP for web performance when browser support is available.
Try it yourself
Compress PNG ImagesAbout PNG
PNG was developed by the PNG Development Group and published as ISO/IEC 15948 in 2004. It was originally created to overcome the patent restrictions of GIF, which was licensed by Unisys. PNG uses the DEFLATE compression algorithm (the same one used in ZIP files) and supports gamma correction and color management for consistent display across devices.
FAQ
- What does PNG stand for?
- PNG stands for Portable Network Graphics.
- Can PNG files be transparent?
- Yes. PNG supports an alpha channel, which provides per-pixel transparency from fully transparent (0) to fully opaque (255). This is one of PNG's most important features and why it's widely used for logos and UI elements.
- Why are PNG files larger than JPG files?
- JPG uses lossy compression which discards some image data to achieve much smaller file sizes, especially for photographs. PNG uses lossless compression which preserves all data, resulting in larger files but perfect quality.
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