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Engineering guides on image compression, PDF tools, web performance, and zero-upload file privacy.
Performance & SEO: 12 articles
Etsy Digital Download File Size and Format: What Actually Works
Etsy allows five files of up to 20MB per listing. How to fit print-ready art inside that, which format suits which product, and the one-file-per-ratio trick.
Why Does My PDF Take Forever to Load in the Browser?
A PDF that freezes a browser tab is usually too heavy, too complex or badly structured for streaming. How to tell which, and what each fix costs.
LinkedIn Image Sizes for Posts, Profiles and Ads (2026 Guide)
The best LinkedIn post image size is 1080 x 1350 (4:5). Every other size in one table: link previews, banner, profile photo, Pages, carousels and ads.
How to Shrink a PDF With Embedded Video or Audio
Embedded media makes PDFs huge, and most compressors leave it untouched. Why, how to re-encode the media itself, and why a link often beats embedding at all.
Local Image Compression: Why Processing on Your Device Is Often Faster, Too
Local image compression runs on your own device instead of a server. Why that is usually faster, what it changes for privacy, and how to verify it.
Your Images Are Probably the Slowest Thing on Your Website
Developers check JS first when pages are slow. Images are almost always the real bottleneck. Five DevTools steps identify exactly which images to fix.
Progressive JPEGs: The Forgotten Optimization That Still Matters
Progressive JPEGs show a full-image blurry preview instantly, then sharpen. They're 2–8% smaller than baseline and make images feel faster.
Responsive Images: Stop Serving Desktop Photos to Phone Screens
Serving a 2 MB desktop photo to every mobile screen wastes 95% of bandwidth. Add srcset, sizes, and picture in minutes to cut mobile load time in half.
Lazy Loading Images: The One-Line Fix That Backfires on LCP
loading="lazy" on your hero image is one of the most common LCP killers. Here's exactly why it happens, how to find it, and how to fix the damage.
The Ultimate Guide to PDF Compression Levels
Screen, eBook, Printer and Prepress: what each PDF compression preset actually does, which to use for email against print, and what each costs.
How to Pass Core Web Vitals with Optimized Images
Images cause 70% of LCP failures. This step-by-step guide diagnoses and fixes image-related Core Web Vitals issues to improve your Google ranking.
WebP vs. AVIF: Which Image Format Is Best for SEO in 2026?
AVIF compresses smaller than WebP but encodes 10× slower. Find out which format wins for LCP, CDN support, and real-world SEO in this 2026 comparison.