Image guides

Tool pages do the work. These pages explain the decisions behind it — what compression removes, which format to send, how to judge a compressor, and which number a form actually wants. Every claim is dated and sourced.

Image Compression Explained (Lossy, Lossless, Exact KB) What quality settings really do, and why "exactly 50 KB" does not exist. WebP vs JPEG vs AVIF vs PNG: Which Format to Use When to use each format, and when converting is a mistake. Free Image Compressor Alternatives: How to Choose A checklist for choosing, plus how upload-based and local tools differ. Image Size vs Dimensions vs Resolution vs DPI Bytes, pixels, megapixels and DPI — which number you actually need.

All guides reviewed 2026-09-22. Corrections are tracked in the public repository.