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Frequently Asked Questions

Frequently Asked Questions🤔

Everything you need to know about image formats, compression, and optimization for the web and beyond

PNG (Portable Network Graphics) 🔍

  • Lossless compression format - preserves all image data ✅
  • Best for images with text, sharp edges, logos, or transparency 👨‍💻
  • Larger file sizes compared to lossy formats (typically 5-10x larger than JPEG) 📈
  • Supports alpha channel transparency (partially transparent pixels) 🌓
  • Widely supported across all platforms and browsers since 1996 🌍
  • Great for screenshots, diagrams, and images that need perfect quality 📊

JPEG (Joint Photographic Experts Group) 📸

  • Lossy compression format - some image data is permanently discarded 🗑️
  • Ideal for photographs and complex images with gradients 🏞️
  • Smaller file sizes but may lose quality with high compression 📉
  • No support for transparency (always has a solid background) 🎨
  • Universal support across all platforms since 1992 🌎
  • Adjustable quality settings allow balancing size vs. quality ⚖️
  • Progressive JPEGs load gradually, showing a low-quality version first 🔄

WebP 🚀

  • Modern format developed by Google in 2010 🆕
  • Supports both lossy and lossless compression 🔄
  • Better compression than PNG and JPEG (25-35% smaller) 📊
  • Supports transparency with less size penalty than PNG 🌗
  • Good browser support (Chrome, Firefox, Edge, Safari 14+) 🌐
  • Ideal for web use to reduce page load times ⚡
  • Combines the best features of JPEG and PNG in one format 🔀

AVIF (AV1 Image File Format) ⚡

  • Newest format, developed by Alliance for Open Media in 2019 🔥
  • Excellent compression efficiency (30-50% smaller than WebP) 💯
  • Supports HDR and wide color gamut for vibrant images 🌈
  • Supports transparency and animations 🎭
  • Growing browser support (Chrome 85+, Firefox 93+, Safari 16+) 📱
  • Best choice for future-proofing and maximum compression 🛡️
  • Based on the AV1 video codec technology 🎬

GIF (Graphics Interchange Format) 🎬

  • Oldest format still in common use (created in 1987) 🕰️
  • Supports simple animations and transparency (not partial transparency) 🌠
  • Limited to 256 colors per frame, making it unsuitable for photos 🎨
  • Large file sizes for animations compared to modern video formats 📈
  • Universal support across all browsers and platforms 🌍
  • Best used for simple animations, not complex videos or high-quality images 🔄
  • Consider using MP4 or WebM video for longer animations 📹

Expert Suggestion 💫

For modern websites, WebP is an excellent default choice with great browser support and optimal compression. For maximum compression, use AVIF with WebP as a fallback. For universal compatibility, JPEG for photos and PNG for graphics with transparency are still reliable options.

Lossless Compression ✅

  • Preserves 100% of the original image quality 💎
  • No data is lost during compression - can be reversed exactly 🔄
  • Results in larger file sizes compared to lossy compression 📈
  • Best for images requiring perfect quality (e.g., screenshots, logos, text) 📝
  • Similar to zipping a file - all original data is preserved 🗜️
  • PNG always uses lossless compression 🔒
  • WebP and AVIF support lossless mode 🛡️

Lossy Compression 📉

  • Reduces file size by permanently removing some image data 🗑️
  • Quality loss can be controlled (high, medium, low settings) ⚙️
  • Great for web images where small quality loss is acceptable 🌐
  • Can significantly reduce file size (up to 90% in some cases) 💯
  • Works by removing details that are less noticeable to human eyes 👁️
  • JPEG always uses lossy compression 🖼️
  • WebP and AVIF support lossy mode with excellent results 🚀
  • Higher compression levels mean more data loss but smaller files ⚖️

Pro Tip 💡

For photographs and most web images, lossy compression with a high quality setting offers the best balance between file size and visual quality. For graphics with text or sharp edges, choose lossless compression to maintain clarity. When in doubt, compare the visual output at different compression levels to find the optimal balance.

Size Increases ⬆️

  • Converting from lossy (JPEG) to lossless (PNG) formats will increase size 📈
  • Adding transparency to an image requires additional data 🌓
  • Converting from a modern format (WebP) to older formats may increase size 🕰️
  • Increasing color depth (e.g., 8-bit to 24-bit) adds more data 🎨
  • Removing compression artifacts can increase file size 🔎

Size Decreases ⬇️

  • Modern formats (WebP, AVIF) use more efficient compression algorithms 🚀
  • Lossy compression can significantly reduce file size 📉
  • Removing unnecessary metadata and color information reduces size 🗑️
  • Converting from lossless (PNG) to lossy (JPEG) formats decreases size 🔄
  • Reducing image dimensions or quality settings decreases file size ⚙️
  • Optimizing color palettes in PNG images can reduce size 🎨

Typical Size Comparison 📈

For the same image at similar visual quality:

  • PNG (lossless): 100% (baseline) 📊
  • JPEG (high quality): 20-30% of PNG size 📷
  • WebP (lossy): 15-25% of PNG size 🚀
  • AVIF (lossy): 10-20% of PNG size ⚡

Format / Chrome / Firefox / Safari / Edge

FormatChromeFirefoxSafariEdge
PNG/JPEG✅ All versions✅ All versions✅ All versions✅ All versions
WebP✅ 17+✅ 65+✅ 14+✅ 18+
AVIF✅ 85+✅ 93+⚠️ 16+ (partial)✅ 95+
GIF✅ All versions✅ All versions✅ All versions✅ All versions

Recommendations 🌟

  • Modern websites: Use WebP with JPEG/PNG fallbacks for maximum compatibility and performance 🚀
  • Future-proofing: Consider AVIF for maximum compression, but always provide WebP and JPEG/PNG fallbacks ⏱️
  • Maximum compatibility: PNG for graphics with transparency, JPEG for photos if you need to support very old browsers 🌍
  • Best practice: Use the HTML picture element to serve different formats based on browser support 🖼️

Progressive (JPEG) or interlaced (PNG) loading is a technique that allows images to load gradually, showing a low-quality version first that progressively improves in quality as more data loads.

Key Benefits 🚀

  • Better user experience during slow connections - users see something immediately 👀
  • Faster initial page rendering and perceived performance ⚡
  • Visual feedback while the full image loads 📱
  • Allows users to get the gist of an image before it fully loads 🧩
  • Particularly useful for large hero images or important visual content 🖼️

Format Support 📋

  • JPEG: Supports progressive loading (called "progressive JPEG") 📷
  • PNG: Supports interlaced loading (similar concept, different implementation) 🔍
  • WebP and AVIF: Do not support progressive/interlaced loading ❌
  • GIF: Supports interlacing (rarely used for this purpose today) 🎬

When to Use Progressive Loading 💡

Progressive loading is most beneficial for larger images (>100KB) and websites with users on slower connections. For very small images, the progressive encoding might actually increase the file size slightly, so it's best used selectively on larger, more important images.

This converter supports progressive JPEG encoding!