Open Source Image Converters

ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX.

File Converter is a very simple tool which allows you to convert and compress one or several file(s) using the context menu in Windows Explorer.

VERT.sh is an online file converter that processes files on your device instead of the cloud. It's blazingly fast, ad-free, and open source.

Converseen is a free cross-platform batch image processor for Windows and Linux that allows you to convert, resize, rotate and flip an infinite number of images with a mouse click.

Switcheroo is designed to give you a simple, quick, and easy-to-use tool to convert and manipulate your images in whatever way you like. It is built on top of the most advanced image editing libraries, ImageMagick.

MAZANOKE is a simple image compressor and converter that runs entirely in your browser. No external uploads, works offline as a web app, and is powered by Browser Image Compression.

Open-source image converter for the latest formats.

Easily convert images (PNG, GIF, BMP, SVG or JPG) to multi-resolution ICO icon files.

Just Converter is a local-first file converter for Windows built for users who want broad format support, practical batch tools, and a clean desktop workflow.

A simple tool to convert many image and video files at once. I made this to handle basic file tasks with a simple interface.

WebPrepImage is a lightweight Windows utility designed to prepare images for web use in a predictable way.

ImageFan Reloaded is a cross-platform, feature-rich, tab-based image viewer, supporting multi-core processing.

If you're tired of endlessly looking online for the right tool, or to find again that website of which you don't recall the name to do a quick conversion, this is the right app for you.

Pngyu is simple PNG image file compression tool. Pngyu use pngquant as a compression engine.

Firefox browser add-on overlays format and quality buttons on images, enabling fast conversion from WebP and other formats to PNG or JPEG with customizable actions.

A Gtk4 app that can convert images to WebP format fast.

Utilities for archiving photos for saving to long term storage or serving over the web. The goals are: use a common, well supported format (JPEG), minimize storage space and cost, identify duplicates / similar photos.

Format Junkie is a Linux application for converting audio, video and image files to multiple popular different formats. The program is just a frontend to avconv and to ImageMagick.

Ciano is a desktop multimedia conversion application responsible for converting videos, music and images. Originally created to provide the best possible experience in the elementary operating system, Ciano makes use of the largest conversion tools: FFmpeg and ImageMagick

With BIMP you can apply a set of manipulations to an entire group of images! It provides an easy to use interface and a lot of batch functions.

Edit one or several images in a few clics. Massive downscale, resize or crop a collection of images quickly.

Transmute is a free, open-source, self-hosted file converter. Convert images, video, audio, data, and documents on your own hardware with no file size limits, no watermarks, and full privacy.

AniView is a free and open source GIF image viewer. You can watch GIF images your way, thanks to all the options that are available in AniView.

Alchemy lets you convert and merge images with ease through an intuitive, drag and drop interface. On Mac, it's easily accessed through the Mac menubar.

Right-click to convert & save WebP, AVIF, and JPG images as PNG instantly. Private, offline, and secure.