Guía de formatos de imagen para principiantes — JPEG, PNG, WebP y más

Why Image Formats Matter

Choosing the wrong image format can mean file sizes 10x larger than necessary, images that look blurry, or files that cannot be opened at all. Understanding the basics of image formats helps you make better decisions about web publishing, document creation, photography, and file sharing.

JPEG (JPG) — The Photography Standard

JPEG uses lossy compression to produce small files from photographs. It is the most widely supported image format in existence — every device, browser, and application can open JPG files. The trade-off: each save slightly degrades quality. For web publishing, social media, and email, JPEG is usually the right choice.

PNG — Quality and Transparency

PNG uses lossless compression — no quality is ever lost. It also supports alpha channel transparency, making it essential for logos, icons, and images that need to overlay other content. The downside: PNG files are 3–10x larger than equivalent JPEGs. Use PNG when quality or transparency matters more than file size.

WebP — The Modern Alternative

WebP offers 25–35% better compression than JPEG at equivalent quality, with support for transparency and animation. Developed by Google, it is now supported by all major browsers. For web publishing, WebP is the optimal format — smaller files, same quality, universal support.

Other Formats

• GIF: Limited to 256 colors. Used for simple animations, not photographs.
• SVG: Vector format for logos and illustrations. Infinitely scalable, tiny file size.
• TIFF: Lossless, large files. Used in professional printing and archival.
• HEIC: Apple's efficient format. Great for storage, poor compatibility outside Apple ecosystem.
• BMP: Uncompressed, massive files. No practical use today.
• AVIF: Next-generation format with even better compression than WebP. Growing support.

Quick Decision Guide

• Photograph for web: JPEG or WebP.
• Logo or icon: SVG (preferred) or PNG.
• Image with transparent background: PNG or WebP.
• Screenshot with text: PNG for sharpness, WebP for smaller size.
• Print: TIFF or high-quality JPEG.
• iPhone photos: HEIC (keep as-is unless you need compatibility).
• Email attachment: JPEG at 80% quality.

Converting Between Formats

Browser-based converters handle all common format conversions. The conversion process re-encodes the image data using the target format's compression algorithm. Converting from a lossy format (JPEG) to another lossy format (WebP) adds another round of compression — keep this in mind for quality-sensitive images.

Use FileKit's free image converter to convert between all common image formats directly in your browser.