Image Optimization Guides
Explore practical image optimization guides covering compression, formats, dimensions and web publishing checks.
A new practical resource explains how to choose a format, check dimensions and review outputs Image Compression Checklist for the Web.
A Curated Guide Library
This library focuses on practical image optimization for websites, documents and digital publishing. Articles are kept only when they answer a distinct question. Pages that overlap or are being reviewed are not presented in this curated index. Each guide should identify the formats, settings, limits and checks that matter for the workflow.
How We Prepare These Guides
Our guides are intended to answer a specific image-workflow question rather than repeat a tool description. We explain the format choice, show the settings that matter, describe cases where the result changes, and distinguish observed behavior from general documentation.
When a claim depends on a browser, device, file type, or external service, we state that limitation instead of presenting one result as universal. If you find an outdated step or a broken example, please report the URL and browser through the Contact page.
Practical guides, reproducible test notes, and implementation tips for optimizing images on the web.
JPEG vs WebP vs AVIF: 360 Real Encodes Measured
We encoded the same 12 frames at every quality level in three formats and published every median size, PSNR value and timing. The results overturn three common beliefs.
How Much Can You Actually Shrink a PNG? 4 Levels Measured
From optimize=True to 64-color palettes: identical files measured at four PNG optimization levels, from -8% to -73%, with honest quality trade-offs.
JPEG Quality 75 vs 85 vs 95: The 5x Size Question
Exact file sizes and PSNR fidelity for every JPEG quality from 50 to 95. What each step up the ladder costs, and the four cases where the top is worth it.
Image Compressor: The Complete Guide to Reducing File Sizes
Learn how to compress images effectively. Our free image compressor reduces file sizes by with savings that vary by the source file and settings. Fast, secure, browser-based.
Lossless Image Compression: Everything You Need to Know
Master lossless image compression techniques. Learn when to use lossless vs lossy compression and how to reduce file sizes without any quality loss.
Compress JPG Online: Fast Photo Optimization Guide
Prepare a JPG for a website or other delivery workflow and review the output for size, dimensions and visual quality.
Compress PNG Online: Shrink PNG Files Effectively
Compress PNG images online without losing transparency. Reduce PNG file sizes significantly while maintaining crisp graphics and text quality.
Optimize Images for Web: The Complete Performance Guide
Learn to optimize images for web performance. Comprehensive guide covering formats, compression, responsive images, and best practices for faster sites.
WebP Format: The Complete Guide for 2025
Learn everything about WebP image format. Why it's better than JPEG and PNG, how to convert images to WebP, and browser support. Complete guide with tips.
Image SEO: How to Optimize Images for Google Search
A practical checklist for image relevance, filenames, alt text, dimensions, responsive delivery and page context.
How to Batch Compress Multiple Images at Once (Free)
Learn how to compress multiple images at once online for free. Batch image compression guide — save hours of work with bulk optimization. No software needed.
How to Reduce PNG File Size Without Losing Transparency
Learn how to reduce PNG file size online without losing transparency or quality. Best methods to compress PNG files for web, email, and social media.