Image Formats Explained: JPEG, PNG, WebP, AVIF, HEIC & More
With over a dozen image formats in common use, choosing the right one can be confusing. This comprehensive guide explains every major image format — what it is, when to use it, and its pros and cons.
JPEG / JPG
Full name: Joint Photographic Experts Group
Best for: Photographs, realistic images
JPEG is the most widely used image format in the world, created in 1992. It uses lossy compression optimized for photographs. JPEG files are relatively small and supported by every device and application. However, JPEG does not support transparency and each save/recompress cycle degrades quality slightly.
Use when: You have a photo and need universal compatibility.
Avoid when: You need transparency, or for graphics with text/sharp edges (PNG is better).
PNG
Full name: Portable Network Graphics
Best for: Graphics, screenshots, logos, images with transparency
PNG uses lossless compression and supports full transparency (alpha channel). It excels at images with sharp edges, text, and flat colors. PNG files are larger than JPEG for photos but perfect for graphics.
Use when: You need lossless quality or transparency.
Avoid when: File size is critical for photographs (use WebP or JPEG).
WebP
Developer: Google (2010)
Best for: Web images of all types
WebP combines the best of JPEG and PNG — it supports both lossy and lossless compression, transparency, and animation. Files are typically 25-35% smaller than equivalent JPEG or PNG. Browser support in 2026 is at 97%.
Use when: Serving images on the web. WebP is the current best all-around web format.
AVIF
Full name: AV1 Image File Format
Best for: Web images where maximum compression matters
AVIF is the newest major format, based on the AV1 video codec. It achieves 40-50% better compression than JPEG and 20% better than WebP. It supports transparency, HDR, and wide color gamut.
Use when: Maximum compression is the priority and your audience uses modern browsers.
Learn more: What is AVIF?
HEIC / HEIF
Full name: High Efficiency Image Container / Format
Best for: iPhone/Apple device photos
HEIC is Apple's default photo format since iOS 11. It produces files ~50% smaller than JPEG with the same quality. However, compatibility outside the Apple ecosystem is limited.
Use when: You are in the Apple ecosystem and storage is a concern.
Avoid when: You need to share with non-Apple users (convert to JPEG first). See: HEIC to JPG
GIF
Full name: Graphics Interchange Format
Best for: Simple animations, memes
GIF is famous for animations but is technically an ancient format (1987). It supports only 256 colors and produces large files. For modern use, animated WebP or short video formats are more efficient.
TIFF
Full name: Tagged Image File Format
Best for: Professional printing, archival
TIFF supports lossless compression and is the standard for professional printing and image archival. Files are large but preserve every detail.
BMP
Full name: Bitmap Image
Best for: Legacy Windows applications
BMP is an uncompressed raster format. Files are very large. It is rarely used today except for legacy system compatibility.
SVG
Full name: Scalable Vector Graphics
Best for: Logos, icons, illustrations
SVG is a vector format — it uses mathematical paths instead of pixels. This means it scales to any size without quality loss. SVG files are typically tiny and perfect for logos and icons. However, it is not suitable for photographs.
ICO
Best for: Website favicons
ICO is the traditional favicon format for websites. It can contain multiple image sizes in a single file. While modern browsers accept PNG favicons, ICO remains the most compatible option.
RAW Formats (CR2, NEF, ARW, DNG, etc.)
Best for: Photography editing and archival
RAW files contain unprocessed camera sensor data, offering maximum editing flexibility. They are large (20-50MB each) and require specialized software to view and edit. Common RAW formats include Canon CR2, Nikon NEF, Sony ARW, and the universal Adobe DNG.
See: How to convert RAW to JPG
Format Comparison Summary
Ready to convert? Use Snap2Format to convert between any of these formats instantly and for free. Check our complete format list for detailed specifications.