Open Source C# Image Converters

FreeImage is a library project for developers who would like to support popular graphics image formats (PNG, JPEG, TIFF, BMP and others). Some highlights are: extremely simple in use, not limited to the local PC (unique FreeImageIO) and Plugin driven!

Reduces up to 90% image size and still keeps the image clarity pristine. Mass Image Compressor (MIC) is one of the most popular, reliable, easy-to-use utility to compress, convert, watermark and resize multiple images at once. Just drag & drop the files and folder and it will compress all images. Best for website image optimization, photographs, game assets, animated image compression. Input: Almost all popular image format, including raw camera format Output: JPEG, PNG, WebP, GIF, AVIF Microsoft Store (If you want to support 💰 project): https://apps.microsoft.com/detail/9NF6R54S63L3?cid=sf Portable version available here : https://sf.net/projects/icompress/files/icompress/Mass%20Image%20Compressor/ If you are using Windows 7 or 8.x, use above link to download MassImageCompressorV3.3.3.msi from above.  macOS option: https://mic.cognirush.com/macos/

Developer's Image Library (DevIL) is a cross-platform image library utilizing a simple syntax to load, save, convert, manipulate, filter and display a variety of images with ease.

Ascii Generator 2 (Ascgen2) is an application to convert images into high quality ASCII art - text that accurately represents the original image. The only program of its kind to support variable width fonts and real-time output adjustment and more.

Provides optical character recognition (OCR) solutions for Vietnamese language.

An utility to preview and export as images multiple brush sets built with Adobe Photoshop (.abr files). Makes you publish custom brush sets on the internet quick and easy.

pngcrush and other tools for manipulating PNG (Portable Network Graphics) and MNG (Multiple-image Network Graphics) files.

Retro Computer Image Library decodes Amiga, Amstrad CPC, Apple II, Atari 8-bit, Atari Portfolio, Atari ST/TT/Falcon, BBC Micro, Commodore 64, Commodore 16/116/Plus4, Commodore 128, Electronika BK, FM Towns, HP 48, Macintosh 128K, MSX, NEC PC-80/88/98, Oric, SAM Coupe, Sharp X68000, Tandy 1000, Timex 2048, TRS-80, TRS-80 Color Computer, ZX81 and ZX Spectrum picture formats. The project contains a simple viewer, plug-ins for general-purpose image viewers and editors, and an everything-to-png converter.

PicView is a fast, free and fully customizable picture viewer for macOS and Windows 10/11. It supports virtually all image file types, including (animated) WEBP, (animated) GIF, SVG, AVIF, HEIC, PSD and many others. Additional features includes viewing EXIF metadata, image compression, batch resizing, viewing images within archives and comic books, image effects, image galleries, and more. Enjoy a clean, free, and fast experience with no annoying pop-ups, and zero tracking. It works out of the box — or you can customize it to your needs. Available in portable and installable versions.

A simple, easy-to-use program for converting multiple image files from one format to another. Supports the following image formats: BMP, EMF, EXIF, GIF, JPG/JPEG, PNG, TIF/TIFF, and WMF.

ImageMagick® is a free and open-source software suite for displaying, converting, and editing raster image and vector image files. It can read and write over 200 image file formats, and can support a wide range of image manipulation operations, such as resizing, cropping, and color correction. ImageMagick is written in C and is available for a wide range of operating systems, including Linux, macOS, and Windows. It can be used as a standalone application, or as a library that can be integrated into other software programs. Overall, ImageMagick is a powerful and versatile software suite for displaying, converting, and editing image files. Its support for scripting and automation, along with its other features, make it a valuable tool for a wide range of image-related tasks.

Flexxi Image Resizer can resize, rotate, rename and convert images. Imagine if you want to - automatically rotate holiday pictures in portrait format - rename images to the date they were taken to join images from different cameras - same also is posible with a simple counter if you just care about the correct order - resize images and lower the quality to reduce the file size for easier sending them per mail - resize shop images all to the same size with a filling background color to have a common format - convert images in a different file format (e.g. jpg to png with all images the same size and transparent filling background) - open your images in Flexxi just by sending them to the application with the right click menu (send to) - preview changes on the images before appling it - use it in English, German or Spanish and much more is posible with Flexxi. Download on Sourceforge is just the Executable, for self-building: https://github.com/mpointner/FlexxiCS

Simple way to encode files and images in base64... Tutorial: http://www.youtube.com/watch?v=G1cQXnzOwcs

Image Tools is a screen capture, file sharing and image processing tool. It features multi-threaded batch image resizing, conversion, cropping, flipping/rotating, watermarks, decolorizing (grayscale, negative, sepia), and optimizing. The BMP, GIF, TIFF, JPEG, PNG, and EMF image types are supported. It is compatible with Linux MONO (only for GNOME and Xfce). Multicore processing is supported to increase performance. The quality for output when optimizing is variable. Color channels can be filtered. An internal benchmarking tool is available. Indexed pixel format images can be processed. You can process your images, publish pieces of your screens, files and send links to everyone you want to share it.

ImageGlass is a lightweight, versatile image viewing application that is designed to take the place of Photo Viewer in Windows 8, 7 and Vista, especially those installations that may have trouble displaying PNG and GIF files in Photo Viewer.

Batch Image Manager is a small and free batch picture converter and resizer (or photo resizer). It can rename, resize and change the format of your images, photos and pictures.

Port of dcraw to C#. Thanks for Dave Coffin the original. Based on v8.88. Code is very much prototype quality and only tested with 450D. Output files from this differ from ones created with the original dcraw (see AHD file for further details)

This is a bulk photo resizer to resize selected images by a given scale. Visit http://tools.solved-problems.com/bulk-image-resizer/ for more information.

AAImageViewer + AAImageLib is a simple application which can Read and Write all HDI Dune image formats (AAI, BMP, PNG, JPG). It includes a .NET library to read and write AAI image format.

Bitmap converter est un logiciel de conversion entre différents types de fichiers bitmap tel BMP, JPG, PNG, GIF, ... Sélectionnez un répertoire, puis choisissez le format de départ, de destination, et en un clic tout est réglé !

The GK3 Tools project is a collection of tools and utilities useful for viewing and modifying the Gabriel Knight 3 data files.

This is a .net application written in c# that utilises the ImageMagick command line application to allow conversion of multiple image formats to different formats. This requires .Net 2.0, ImageMagick and GhostScript to be installed to work.

A versatile desktop magnifying glass. Customizable sizes, drag the magnifier or lock it to the mouse, variable zoom, capture or snapshot the desktop underneath and more. It is mainly designed for ease of use, and for people with accessibility issues.

Flexible Tagged Format (FTF) Image Converter converts between FTF, TIFF and other .NET standard supported formats

This little tool helps you auto cropping images. It means it automatically cuts of white margins from, for example, scanned pictures. I built this tool because I had to scan a lot of pictures and I did this with an ADF-scanner.