Compare Portable Network Graphics and Tagged Image File Format formats — understand the key differences and when to use each
Portable Network Graphics
PNG (Portable Network Graphics) is a lossless image format created in 1996 as a patent-free alternative to GIF. PNG uses DEFLATE lossless compression, meaning images retain 100% of their original quality regardless of how many times they're saved. The format supports 8-bit (256 colors) and 24-bit (16.7M colors) color modes, plus a full 8-bit alpha channel for smooth transparency and semi-transparency effects. PNG is the preferred format for screenshots, logos, icons, UI elements, diagrams, and any image requiring sharp edges or transparency. PNG files are typically larger than JPG for photographs but significantly better for graphics with text, solid colors, or transparency. PNG also supports interlacing for progressive loading, gamma correction for cross-platform color consistency, and embedded text metadata. Modern alternatives like WebP and AVIF offer better compression, but PNG remains the gold standard for lossless quality.
Tagged Image File Format
TIFF (Tagged Image File Format) is a versatile, high-quality image format widely used in professional photography, publishing, printing, and document archiving. Created by Aldus (now Adobe) in 1986, TIFF supports multiple compression methods including LZW (lossless), ZIP, and JPEG, as well as uncompressed storage. TIFF can store images in various color spaces (RGB, CMYK, LAB, grayscale) and bit depths (8-bit, 16-bit, 32-bit float), making it essential for color-critical workflows. The format supports multiple pages/layers in a single file, alpha channels, clipping paths, and extensive metadata (EXIF, IPTC, XMP). TIFF/IT is used for prepress data exchange, and GeoTIFF embeds geospatial data for mapping applications. While TIFF files are larger than JPG or PNG, they're the preferred archival format for preserving maximum image quality and metadata.
| Feature | PNG | TIFF |
|---|---|---|
| Full Name | Portable Network Graphics | Tagged Image File Format |
| File Extension | .png | .tiff |
| Category | image | image |
| Free to Convert | ✓ Yes | ✓ Yes |
| Browser Support | ✓ All Browsers | ✓ All Browsers |
| Convert to Each Other | ✓ Yes | ✓ Yes |
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最大文件大小：2GB