Knowledge base

Image Compression & Format Guides

From choosing a format to shrinking files without obvious damage, these guides pair practical settings with the reasoning behind them.

Privacy & security

Can You Compress Images Online Without Uploading Them?

Understand the difference between local processing and server uploads, then compress a batch safely in your browser.

Format choice

A practical comparison of four common image formats, including the trade-offs that matter in real workflows.

Web performance

Build a reliable web-image workflow from source dimensions through responsive delivery without sacrificing clarity.

iPhone photos

Turn iPhone HEIC photos into universal JPG files while understanding what conversion preserves and changes.

Lossless & alpha

Separate truly lossless optimization from lossy palette reduction and protect transparent edges.

Batch workflow

A reviewable folder workflow that keeps originals safe and catches quality mistakes before they spread.

Compression basics

Why the same quality value behaves differently across images, and what an SSIM-guided search actually solves.

Dimension planning

Work backward from the destination and remove unused pixels before lowering quality.

Troubleshooting

Turn “blurry” into a specific symptom and fix the real dimension, format, or encoding problem.

How the tool works

Compare fixed quality with per-image adaptation and learn what Smart auto still cannot decide for you.