Dinky app icon

Dinky

Making images smaller.

A tiny macOS app that converts JPGs and PNGs into WebP, AVIF, or lossless PNG. Drag and drop, get smaller files back. Free and open source.

Download for macOS GitHub

4.7 MB · v1.2.0 · Requires macOS 26 Tahoe

Dinky drop zone idle state Dinky sidebar — format, max width, max file size, destination Dinky sidebar — performance, notifications, advanced

Every screenshot on this page was compressed with Dinky. Obviously.

Drag and drop

Drop images on the window, or use the file picker.

Format conversion

Output to WebP, AVIF, or lossless PNG. That's where the real savings live.

Max width

Resize on the way out with common web presets or a custom value.

Max file size

Binary-searches the quality level to hit an exact KB or MB target.

Smart quality

Detects photo vs. screenshot per image and picks quality accordingly. Text stays crisp.

Batch compression

Multiple files compress concurrently with live results as they finish.

PNG lossless

Run oxipng on PNGs when you need to keep transparency or format fidelity.

Manual mode

Drop files first, then right-click each one to pick a format individually.

Finder-like results

Select, drag, double-click to open, right-click for per-file actions.

Quick Actions

Compress straight from Finder's right-click menu, no app launch needed.

Performance

Fast runs one at a time. Fastest uses every core, no waiting.

Smart destination

Save next to the original, pick a custom folder, or trash originals after.

Quirky personality

Notifications that change with the count and time. Animations with character.

Update-aware

Checks GitHub for new releases on launch. No need to revisit the repo.