DropSlim

Name: DropSlim — Download free. Image optimizer
Availability: InStock
Rating: 5 (1 reviews)
Author: onza

DropSlim — Free Download. Image optimizer

DropSlim is a lightweight desktop program for compressing and converting images on Windows and macOS. Drag files or entire folders onto the window and the program reduces file size, changes formats, and applies pixel limits while keeping originals or writing new files with a .min suffix. It works fully offline, requires no account, and processes batches of hundreds of files in one run.

★★★★★

5.0(1 ratings)

Download DropSlim (Official links)

File size: 8.75 MB

The latest version of DropSlim is: 1.7.0

Operating system: Windows, Mac OS, Linux

Languages: English, Spanish, German, French, Italian, Portuguese, Japanese

Developer: onza

Price: $0.00 USD (Free product)

Local compression. The core function reduces the byte size of image files directly on the machine without sending data to a server. Compression uses established encoders for PNG, JPEG, WebP, AVIF, GIF, and SVG. Large screenshots, photos, and graphics become smaller files suitable for email attachments, web uploads, and long-term archiving. The source file remains untouched unless overwrite mode is chosen.
Format conversion. Settings allow conversion between JPEG, PNG, WebP, and AVIF. The original format can also be preserved. On macOS, HEIC files are converted, while GIF and SVG remain in their existing format. This helps when a content management system, website, or client requires a specific file type.
Maximum width and height. Pixel limits can be defined in the settings. Images larger than the limit are scaled down while the aspect ratio stays unchanged. This applies to JPEG, PNG, WebP, and AVIF. The function is intended for oversized photos and graphics that exceed the dimensions required by a website or email template.
Drag and drop input. Files or folders can be dropped onto the program window. Dropped folders are processed recursively, including all subfolders. No file picker or command syntax is required for normal use. This shortens repetitive preparation work when many images from different directories must be handled.
Batch processing. Hundreds of files are handled in a single run. A folder with 200 screenshots can be optimized at once. The processing queue runs without freezing the window, so additional files can be added while a batch is active. Results are shown in a list.
Save destination control. Output location depends on settings. With the .min suffix enabled, a new file is written next to the original, for example photo.png becomes photo.min.png. With the suffix disabled, the original can be overwritten in place. A minified subfolder option places results into a minified directory, and a custom folder can be selected as the destination.
Output format presets. Presets for web, email, and archive define typical compression and conversion behavior. These presets reduce the number of manual decisions when files are prepared for a known target. Formats covered include PNG, JPEG, GIF, SVG, WebP, HEIC, and AVIF.
Offline operation. The program needs no internet connection for compression or conversion. All processing runs on the local computer. This makes it usable in environments with restricted networks and prevents image data from leaving the machine.
Privacy protection. Files are not uploaded, and no tracking is performed. The program contains no account system and no telemetry. Source images remain on the local drive during the entire operation.
Command line interface. A CLI for macOS provides batch compression from the terminal using the same engine as the desktop application. It can be installed with Homebrew or from a tarball. Commands support output folder selection, format choice, maximum dimensions, and JSON output.
Open with DropSlim. On macOS, images can be sent from Finder through the Open With menu. This starts compression without dragging files onto the application window. It shortens the workflow for single files and small groups.
Multilingual interface. The interface is available in English, German, French, Spanish, Italian, Japanese, and Brazilian Portuguese. The language can also follow the system setting. This supports users who prepare images in different regional environments.
Result review and reveal. Optimized files appear in a result list. Each output can be revealed in Finder or File Explorer. This provides a direct check of the saved file and its location after processing.
Open source distribution. The program is published under the MIT license. Source code is available on GitHub and can be inspected, forked, or extended. Distribution is free and contains no subscription, advertisement, or paywall.

DropSlim was created as a modern alternative to image optimization tools that are no longer actively maintained. Development is led by the team behind the onza GitHub account, which publishes the source code and release builds. The first public versions appeared in the mid-2020s, with version 1.6.3 representing a mature release for macOS and Windows. The application is written in Rust and uses the Tauri framework for the desktop interface. Compression relies on established encoders including imagequant, oxipng, zenjpeg, OXVG, gifsicle, WebP, and AVIF libraries. The macOS command line version shares the same processing engine. The project is distributed under the MIT license and remains free of charge.

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