Smolr – Compress and convert images to modern formats locally on macOS

Summary: Smolr is a free, open-source macOS app that compresses and converts images to WebP, AVIF, and JPEG XL formats with quality control. It processes images locally without uploading, supports batch processing, and strips metadata to reduce file size.

What it does

Smolr converts PNG, JPEG, GIF, WebP, AVIF, and JPEG XL images to modern formats while allowing users to adjust quality between 50% and 100%. It batch processes multiple files using bundled encoders and performs all operations locally on the Mac.

Who it's for

It is designed for web developers and users who need local, batch image compression and format conversion without relying on online tools.

Why it matters

Smolr eliminates the need to upload images to external websites, ensuring privacy and faster processing with full local control over compression and conversion.