Open Source Windows Image Converters
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Image Converters for Windows
View 40 business solutionsBrowse free open source Image Converters and projects for Windows below. Use the toggles on the left to filter open source Image Converters by OS, license, language, programming language, and project status.
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libjpeg-turbo
SIMD-accelerated libjpeg-compatible JPEG codec library
libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2, NEON, AltiVec) to accelerate baseline JPEG compression and decompression on x86, x86-64, ARM, and PowerPC systems. On such systems, libjpeg-turbo is generally 2-6x as fast as libjpeg, all else being equal. On other types of systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by virtue of its highly-optimized Huffman coding routines. In many cases, the performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs. libjpeg-turbo implements both the traditional libjpeg API as well as the less powerful but more straightforward TurboJPEG API. libjpeg-turbo also features colorspace extensions that allow it to compress from/decompress to 32-bit and big-endian pixel buffers (RGBX, XBGR, etc.), as well as a full-featured Java interface. -
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Reference library for supporting the Portable Network Graphics (PNG) format.
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GraphicsMagick
Swiss army knife of image processing
GraphicsMagick provides a set of commandline tools and programming APIs for manipulating, editing, and converting raster and vector images. It is derived from ImageMagick, with the objective of providing better stability and performance than ImageMagick while retaining the original MIT/X11 license. -
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Hugin
Panorama photo stitcher
With Hugin you can assemble a mosaic of photographs into a complete immersive panorama, stitch any series of overlapping pictures and much more. -
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The Animated Portable Network Graphics (APNG) is an unofficial extension of the Portable Network Graphics (PNG) format. APNG patch provides APNG support to libpng. APNG support was merged! https://github.com/pnggroup/libpng/pull/706
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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!
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SageThumbs
Powerful Windows shell extension allowing to preview images.
SageThumbs is a powerful shell extension allowing to preview enormous amount of image formats directly in Windows Explorer by using Pierre-e Gougelet's GFL library (XnView's author). Please read carefully the following information: As SageThumbs is a Windows Explorer context menu extension, there is no an executable file that you should launch to bring it up. To use it, just open any folder with image files in Windows Explorer, and then right-click a file you want to preview. You'll see the thumbnail immediately in the context menu. System Requirements: * Windows XP/2003/Vista/2008/7/2012/8/8.1 32/64-bit * About 5 Mb of disk space + additional space for cache -
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OptiPNG
Advanced PNG optimization program
OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections. -
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Filee
Free, open-source file converter: 263 formats, offline, drag and drop
Filee is a free, open-source file converter for Windows, macOS and Linux. Hold a key while dragging files and a ring of presets (the donut) appears at the cursor: drop the files on one and they're converted on your own PC. Nothing is uploaded. It handles 263 formats: pictures, PDF, Word, Excel, PowerPoint, Korean HWP/HWPX, Chinese OFD, video, audio, e-books, archives, CAD drawings, 3D models, maps and more. The engines it needs come bundled or are downloaded on demand from their official sources. Presets can resize and compress, add a watermark, page numbers or a password to PDFs, remove metadata, fit a file under a size limit for email or chat, and replace the original. Watch folders convert new files on their own, and a "filee" command does the same from scripts. The interface speaks 16 languages. MIT licensed; Windows releases are code-signed. -
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converseen
A batch image converter and resizer
Converseen is a free cross-platform batch image processor for Windows, Linux, macOS, FreeBSD, and other operating systems. It allows you to convert, resize, rotate, and flip an infinite number of images with a single mouse click. Moreover, Converseen can convert an entire PDF document into a set of images with your preferred characteristics. You can choose from over 100+ formats, set the size, resolution, and the filename. Thanks to ImageMagick, the powerful image manipulation library, Converseen can handle more than 100 image formats, including DPX, EXR, GIF, JPEG, JPEG-2000, PNG, SVG, TIFF, WebP, HEIC/HEIF, and many others. Converseen is designed to be user-friendly, fast, practical, and best of all, it’s available for free! -
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A whole bunch of utilities for primitive manipulation of graphic images. Wide array of converters from one graphics format to another. E.g. from g3 fax format to jpeg. Many basic graphics editing tools such as magnifying and cropping.
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Developer's Image Library
A full featured cross-platform image library
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. -
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Luminance HDR
Complete solution for HDR photography
Luminance HDR is a complete suite for HDR imaging workflow. It provides a wide range of functionalities, during both the fusion stage and the tonemapping stage. Its graphical user interface, based on Qt5, runs on a variety of platforms, such as Microsoft Windows, Mac OS X 10.9 and later and several Unix flavors (Linux, FreeBSD and others). Input images can be supplied in multiple formats, from JPEG to RAW files. In the same way, output can be saved in many different formats as well, from JPEG to TIFF (both 8 bit and 16 bit per channel), enabling all the power of your post processing tools. -
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Fonts and font metrics customarily distributed with Ghostscript. Currently includes the 35 standard PostScript fonts and a grab-bag of others.
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Mass Image Compressor
Compress, Convert, Watermark and Resize Images/Photographs in bulk
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 Alternate download links (github): https://github.com/Cognirush-Labs-LLP/icompress-win/releases/latest 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/ -
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The UFRaw (Unidentified Flying Raw) is a tool for reading and manipulating raw images from digital cameras. It supports most of the existing raw formats (any format supported by DCRaw). UFRaw can be used on its own or as a Gimp plug-in.
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BRL-CAD
Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools. -
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Potrace
Transforms bitmaps into vector graphics
Potrace is a tool for tracing a bitmap, which means, transforming a bitmap into a smooth, scalable image. A typical use is to create SVG or PDF files from scanned data. The resulting image can then be rendered at any resolution. -
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APNG Assembler
Creates APNG animation from PNG/TGA image sequence.
Creates highly optimized Animated PNG files from PNG/TGA image sequences. CLI versions available for all major OSes. GUI versions for Windows and macOS. Also, APNG Disassembler can be found at http://sourceforge.net/projects/apngdis -
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lcd-image-converter
Tool to create bitmaps and fonts for embedded applications.
This program allows you to create bitmaps and fonts, and transform them to "C" source format for embedded applications. The transformation of the images to the source code is made by using templates. Therefore, by modifying the templates, you can change the format of the output within certain limits. -
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pngcrush and other tools for manipulating PNG (Portable Network Graphics) and MNG (Multiple-image Network Graphics) files.
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SageThumbs 2k
Thumbnails for everything Windows won't show you.
SageThumbs 2K is a modern revival of the classic SageThumbs idea: make Windows Explorer show thumbnails for the file types it normally ignores. SageThumbs 2K adds fast thumbnail previews for hundreds of image, RAW camera, design, document, ebook, comic, audio, video, CAD, and 3D-related formats. It is designed to feel native on Windows 11, while still keeping the simple promise that made the original legendary: open a folder, and your files finally show real previews. It also includes a practical right-click toolkit for common file tasks, including image conversion, resizing, lossless rotation, PDF/CBZ combining, OCR, metadata stripping, folder icons, wallpaper setting, and more. Menu items can be shown, hidden, and reordered from the settings dialog. SageThumbs 2K is built for people who work with large folders of mixed media, creative files, downloads, archives, camera RAW files, design assets, comics, ebooks, and obscure formats that Windows was never designed to understand -
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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.
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tesseract-ocr alternative download
Alternative download for tesseract-ocr project
Alternative download for tesseract-ocr project -
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Dragon UnPACKer is a game archive (Quake PAK, etc..) unpacking tool. It is plugin based making easier to add new archive file formats. It has convert ability and raw search function for known material (audio, video and pictures).
