GopherSnap Concurrent CLI Image Converter in Action
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Open Source CLI App

Blazing Fast, Zero-Friction Image Optimization.

GopherSnap is a high-performance, concurrent Command Line Interface (CLI) image converter written entirely in Go. Effortlessly convert, resize, and compress entire directories into modern web-optimized formats like WebP and AVIF.

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Why GopherSnap?

Stop fighting complex shell scripts and massive C dependencies.

Blazing Fast Concurrency

Built on Go, it leverages lightweight goroutines to process multiple images in parallel, drastically reducing wait times for large batches.

Pure Portability (No CGO)

Uses pure-Go/WASM implementations for complex formats like WebP and AVIF. No messy C library dependencies to install; runs anywhere Go runs.

Zero-Friction Batching

Instead of writing complex scripts, just point GopherSnap at a folder. It automatically processes all supported images and mirrors the exact directory structure.

Smart Compression

Features like a --max-size flag allow the tool to intelligently degrade quality until an image fits under a specific file size limit.

Who is it for?

Web Developers & Designers

Bulk-convert heavy PNGs/JPGs into WebP or AVIF to improve website load times and Core Web Vitals.

System Administrators

A reliable, easily deployable CLI tool for automated image optimization pipelines on servers (no C dependencies).

Content Creators & Photographers

Quickly resize and compress massive folders of high-res photos for web sharing.

Key Features

  • Batch Processing & Directory Mirroring
  • Modern Format Support (JPG, PNG, WebP, AVIF)
  • Concurrent Execution (Customizable worker pools)
  • Proportional Resizing (Maintain aspect ratio)
  • Target File Sizing (--max-size flag)
  • Beautiful CLI UI with styled progress bars

How to Use GopherSnap

Get up and running in seconds. No complex setup required.

Installation

Install directly via Go:

go install github.com/benjaminjvdm/GopherSnap@latest

Basic Conversion

Convert an entire directory to WebP (default), saving to a new output folder:

gophersnap convert -i ./raw-photos -o ./web-ready

Advanced: AVIF & Concurrency

Convert a specific image to AVIF, set quality to 75%, and use 8 workers:

gophersnap convert -i hero-image.jpg -o ./optimized -f avif -q 75 -j 8

Smart Resizing

Resize images to a max width of 800px (height scales automatically):

gophersnap convert -i ./images --width 800

Target File Size Limit

Ensure output files are less than 2 Megabytes:

gophersnap convert -i ./images --max-size 2mb