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.

Shutter Encoder is a free professional encoding and conversion software for everyone, developed with video editors.

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.

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.

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.

Open-source image converter for the latest formats.

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.

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

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

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.

ClassicImageViewer is a simple image viewer for Linux with some editing features.

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.

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.

HRConvert2 is an open-source web-app that converts files without tracking users across the net or infringing on your intellectual property.

ToolsForImage is free and open-source platform for image compression, resizing, cropping, format conversion, rotation, watermarking, face blurring, and more.

libvips is a demand-driven, horizontally threaded image processing library. Compared to similar libraries, libvips runs quickly and uses little memory. libvips is licensed under the LGPL 2.1+.

This is an "Image to PDF Converter" (open source) software build for Windows which converts image files to PDF(Portable Document Format) files quickly.