Sign In

Welcome! Log into your account

Forgot your password?

Create an account

Sign Up

Welcome! Register for an account

A password will be e-mailed to you.

Password Recovery

Recover your password

A password will be e-mailed to you.

Available for:

RIOT 1.0.1 – Free Image Optimizer

RIOT 1.0.1 – Free Image Optimizer

RIOT (Radical Image Optimization Tool) is a free image optimizer that will let you to visually adjust compression parameters while keeping minimum file size. It uses with a side by side (dual view) or single view interface to compare the original with the optimized image in real time and instantly see the resulting file size.

It is lightweight, fast and simple to use, yet powerful for advanced users. You will be able to control compression, number of colors, metadata settings and much more, and select image format (JPG, GIF or PNG) for your output file.

Also you can integrate RIOT as plug-in in well known programs like The GIMP, IrfanView and XnView.

Main features of RIOT:

  • open many image types including rare/scientific types
  • save and optimize JPEG, GIF and PNG with a simple, clean user interface
  • automatic optimization selects the most suitable format and parameters
  • works in dual view: (original – optimized image) or single view (optimized image).
    automatic preview of resulting image
  • in-place compare function (alternativelly display the original image over the optimized image to notice small pixel changes)
  • compress files to desired filesize threshold
  • fast processing
  • batch support (process multiple files at once)
  • transparency handling options
  • decide if you want to keep metadata (comments, IPTC, Adobe XMP, EXIF profiles, ICC profiles).
  • transfer metadata between image formats (destination format must support them)
  • common tools: pan and zoom, rotate, flip
  • basic image adjustments: brightness, contrast, gamma, invert
  • visually reduce number of unique colors for PNG and GIF images in order to reduce filesize
    (two quantization methods are available: Xiaolin Wu and NeuQuant neural net)
  • resize image by using well known resample filters (ex: Lanczos3, Catmull Rom, Bicubic, and others)
  • out-of-the-box support for external PNG optimizers (optipng, pngout, etc)
  • the compression and the results are comparable to those of commercial products, even higher.
  • Adaptive logarithmic tone mapping algorithm (Drago) used for HDR images

Input image types

  • common bitmap images as well as Adobe Photoshop PSD files
  • popular HDR formats and RAW camera images
  • rare/scientific types (up to 128 bpp, integer and floating point)

Changes in RIOT 1.0.1 (Jan, 28 2021):

  • replaced AVX2 with SSE2 for better compatibility with older CPUs

Changes in RIOT 1.0.0 (Jan 25, 2021):

  • 64 bit version, allowing bigger images to be processed (>50 MP)
  • improved compression with up to 30% for jpeg images
  • decoding support for jpeg images using arithmetic coding
  • improved PE security with DEP and ASLR
  • the AVX2 instruction set for the 64bit version should provide better performance on larger images
  • the 32 bit version is gonna be deprecated (probably the last 32 bit release)
  • fixed display of optiized size in higher text dpi settings
  • using less memory after the image is analyzed
  • other minor fixes & tweaks

Changes in RIOT 0.6.2 (May, 7 2019):

  • fixed clipboard lock
  • fixed keep original date/time if in-place optimization
  • prevent delete of original if in-place optimization and “Delete original files” are used
  • fixed keep original file extension when saving files in batch
  • fixed keep original file extension when saving files from the main window
  • fixed file extension filter when using the Save As dialog for less common JPEG extensions
  • fixed render images after Auto resize dialog is discarded
  • fixed multi-monitor issue: restore position only if the saved position would be inside the visible area
  • fixed overriding settings in “Auto, Custom Format mode” did not switched the mode the Manual
  • fixed “Auto, Custom Format mode” blending transparency for JPEG format (white color usad now by default instead of black, but should use the last chosen color)
  • improved check for updates procedure. now enabled by default. does not create temporary files anymore
  • added minimum compression setting to PNG (zlib level 1). This is useful for using with an external optimizer or reducing colors before final compression
  • png compression settings “minimum” and “low” are always remembered upon program restart if save settings on exit is enabled.

Homepage –

Supported Operating Systems: Windows 7, 8, 8.1, 10, 11.