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Dinky

Dinky makes files smaller.·dinkyfiles.com

Dinky is a macOS app that automatically compresses and converts images, videos, audio, and PDFs. It converts still images to WebP, AVIF, HEIC, or lossless PNG, exports smaller MP4 video with optional FPS cap, cross-converts audio formats via afconvert, and flattens or preserves PDFs with optional scan OCR. It runs entirely locally on the user's Mac with no cloud upload or account required, and is free and open source under the MIT license.

What it's for

Shrinking images, videos, audio files, and PDFs for smaller file sizesConverting images to WebP, AVIF, HEIC, or lossless PNGCompressing video to smaller MP4 with H.264 or HEVC and optional FPS capCross-converting audio formats (AAC, ALAC, WAV, AIFF, FLAC, MP3)Flattening or preserving PDFs, including OCR on scanned PDFsAutomatically compressing files dropped into a watched folderCompressing files pasted from the clipboard system-wideCompressing a file directly from a URLBatch compressing multiple files concurrentlyAutomating compression via Apple Shortcuts or CLI/local API

Features 20

Audio cross-conversion (AAC, ALAC, WAV, AIFF, FLAC, MP3) via afconvert/lame
Batch compression with adjustable concurrency (Fast/Faster/Fastest)
Before & after preview (slider or side-by-side)
CLI (dinky compress --json) and local API (dinky serve) for scripting/automation
Clipboard Compress via system-wide hotkey (⌘⇧V)
Compression presets
Drag and drop or file picker compression
Finder Quick Actions
Format conversion for images (WebP, AVIF, lossless PNG, HEIC)
Launch at login
Localized UI in 13 languages
Max file size targeting via binary search on quality
Max width resizing with common web presets or custom values
Metadata stripping (EXIF, GPS, camera data)
PDF flatten, preserve, and target-size compression with optional scan OCR
Session history of compressed files
Smart quality detection (photo vs. graphic) via Vision + EXIF
URL Drop to compress files from a direct link (up to 500 MB)
Video export to MP4 (H.264/HEVC) with optional FPS cap
Watch Folders for automatic compression of new files

At a glance

free tieropen sourceAPI

TypeDesktop app

DeploymentInstalled (local)

PlatformsmacOS

LanguagesEnglish, Spanish, French, Italian, German, Japanese, Korean, Dutch, Portuguese, Russian, Turkish, Simplified Chinese, Traditional Chinese

CompanyTestament Made, LLC

Integrations

Apple ShortcutsGoogle DriveiCloud DriveDropbox

Pricing

Entirely free to download and use; the site states 'No trial, no watermarks, no "pro" tier.'

FreeFree

Only tier offered; explicitly no trial, no watermarks, no separate paid 'pro' tier.