DropSlim

macOS & Windows · local · private · free · open source

Make large
files small.

Drop your images. DropSlim compresses — optionally convert or resize. Everything stays on your computer — no account, no server.

Download for macOS Apple Silicon
Download for Windows Windows 64-bit
0%

less volume (+/-)

For everyone who sends & uploads images.

Email attachment full? Notion slow? Slack complaining? Website maintenance? Uncompressed graphics files are neither sustainable nor performant. DropSlim turns PNG, JPEG, GIF, SVG, WebP, HEIC and AVIF into sendable, web-ready files — optionally convert formats or set max dimensions, on Mac and Windows, without exporting anything in Photoshop.

Why DropSlim.

before 12,4 MB 4 screenshots, one email — limit reached
after 2,1 MB same content, plenty of room to spare

  • Compression

    Large image files get smaller locally — ready for email, web, and archive, without quality drama.

  • Convert format

    Convert JPEG, PNG, WebP, and AVIF — or keep the original. HEIC converts on macOS. GIF and SVG stay as they are.

  • Max width & height

    Set pixel limits in settings. Oversized JPEG, PNG, WebP, and AVIF shrink while keeping aspect ratio.

  • Drag & Drop

    Drop files or folders onto the window. That is all you need.

  • Small and fast

    Lightweight app, fast compression. Small footprint, no bloat.

  • Runs offline

    No internet required. Compression runs entirely on your computer.

  • Privacy

    No upload. No tracking. Your photos never leave your machine.

  • Batch processing

    200 screenshots? One go. Drop a folder, everything in one run.

  • PNG · JPEG · GIF · SVG · WebP · HEIC · AVIF

    All common image formats — presets for web, email, archive. HEIC on macOS only.

  • Settings

    Overwrite, save alongside with a `.min` suffix, or to your own folder — you decide what happens.

  • Multilingual

    English, Deutsch, Français, Español, Italiano, 日本語, and Português — or follow your system language.

  • CLI (macOS)

    Batch compression from the terminal — same engine as the app, no GUI. Install via Homebrew or tarball. Apple Silicon only.

  • Open with DropSlim (macOS)

    Right-click an image in Finder → Open With → DropSlim. Compress without dragging onto the app window.

  • Open Source

    MIT license. Source code on GitHub — inspectable, forkable, open to contributions.

Get it.

Free. No subscription. No ads. Open source under the MIT license.

Download for macOS Apple Silicon
Download for Windows Windows 64-bit

Version 1.6.3

macOS

macOS 11 (Big Sur) or later, Apple Silicon (M1 or newer)

  1. Download the DMG file.
  2. Open the DMG and drag DropSlim to Applications.
  3. Open DropSlim from Applications.

Windows

Windows 10 or later (64-bit)

  1. Download the setup EXE.
  2. If your browser blocks the download, choose Keep or Keep anyway.
  3. Run the installer.
  4. If SmartScreen shows "Windows protected your PC", click More info, then Run anyway.
  5. Follow the setup wizard and start DropSlim from the Start menu or desktop shortcut.

CLI (macOS)

macOS 11 (Big Sur) or later, Apple Silicon (M1 or newer)

Command-line tool for batch compression — same engine as the app, no GUI.

brew tap onza/tap
        brew install dropslim
        dropslim compress photo.png images/
  1. Run dropslim compress --help for output folder, format, max dimensions, and JSON output.

Or download dropslim-cli_*_aarch64.tar.gz from GitHub Releases.