Image Formats Guide

Complete Image Formats Reference

Understanding image formats is essential for anyone working with digital media. Here is a comprehensive overview of the most common formats, their technical characteristics, and ideal use cases.

JPG / JPEG (Joint Photographic Experts Group)

JPG is the most widely used image format for photographs. Created in 1992, it uses DCT-based lossy compression that can reduce file sizes by 90% or more while maintaining acceptable visual quality. JPG supports 24-bit color (16.7 million colors) but does not support transparency or animation. It is universally supported across all browsers, operating systems, and applications.

Technical details: Uses discrete cosine transform (DCT) compression. Quality can be adjusted from 1 to 100. Supports EXIF metadata for camera information. Maximum image size is 65,535 × 65,535 pixels.

PNG (Portable Network Graphics)

PNG was created in 1996 as a patent-free replacement for GIF. It uses lossless compression, meaning no image data is lost during saving. PNG supports full alpha transparency (256 levels), making it the standard format for web graphics, icons, and UI elements. It supports 8-bit, 24-bit, and 48-bit color depths.

Technical details: Uses DEFLATE compression (lossless). Supports interlacing for progressive loading. Can store gamma correction and color space information. Typical files are 2-5x larger than equivalent JPGs.

WEBP

Developed by Google in 2010, WEBP is a modern format supporting both lossy and lossless compression. It typically achieves 25-35% better compression than JPG at equivalent quality. WEBP supports transparency (like PNG) and animation (like GIF), making it a versatile format for web use. Browser support has reached over 95% globally.

Technical details: Based on VP8 video codec for lossy mode. Maximum dimensions: 16,383 × 16,383 pixels. Supports ICC color profiles. Lossy mode uses predictive coding similar to VP8 video compression.

GIF (Graphics Interchange Format)

Created in 1987, GIF is primarily used for simple animations and low-color graphics. It supports only 256 colors per frame and basic 1-bit transparency (fully transparent or fully opaque). While largely superseded by WEBP and APNG for web use, GIF remains popular for short animations due to universal platform support.

BMP (Bitmap)

BMP is a simple, uncompressed raster format native to Windows. It supports various color depths from 1-bit monochrome to 32-bit RGBA. Due to the lack of compression, BMP files are very large and rarely used for web or sharing. They are sometimes used in Windows applications or as intermediate formats during processing.

TIFF (Tagged Image File Format)

TIFF is a flexible format used primarily in professional photography, publishing, and scanning. It supports lossless compression (LZW, ZIP), multiple color spaces (RGB, CMYK, Lab), high bit depths (up to 64-bit), and can store multiple pages in a single file. TIFF is the standard format for high-quality print production.

SVG (Scalable Vector Graphics)

Unlike the raster formats above, SVG is a vector format based on XML. It describes images using mathematical shapes, paths, and text rather than pixels. SVGs can scale to any size without quality loss, making them ideal for logos, icons, illustrations, and responsive web graphics. They can be styled with CSS and manipulated with JavaScript.

AVIF

AVIF is the newest format on this list, based on the AV1 video codec. It offers even better compression than WEBP — typically 30-50% smaller than JPG at similar quality. AVIF supports HDR, wide color gamut, and high bit depths. Browser support is growing rapidly but not yet universal.

Format Comparison Table