rFXGen

A simple and easy-to-use fx sounds generator, based on the amazing Dr.Petter's sfxr.

What can I do with rFXGen?

Generate chiptune style sounds for your games or applications, adjusting fx parameters with maximum control!

rFXGen can be used for free as a WebAssembly online tool and it can also be downloaded as a standalone tool for for seeveral platforms.

Features

• Predefined sound presets (Coin, Shoot, Explosion, PowerUp...)
• Multiple wave types supported (Square, Sawtooth, Sine, Noise)
• Up to 10 sound slots to store generated sound (temporary save)
• Load .rfx files with sound generation parameters
• Save .rfx files with sound generation parameters (104 bytes only)
• Export wave data as .wav, .raw data or .h code file (byte array)
• Configurable sample-rate, bits-per-sample and channels on export
• Multiple GUI styles with support for custom ones (.rgs)
• Command-line support for .rfx to .wav batch conversion
• Command-line support to generate audio files based on presets
• Command-line audio player for .wav, .ogg, .mp3 and .flac
• Completely portable (single-file, no-dependencies)
• Free and open-source

Screenshot

Basic Usage

Open the tools and use the buttons to generate random sounds. Use the sliders to customize sound parameters. Sounds could be saved as .rfx (sound generation parameters) and also exported to .wav, .raw (samples data) and .h (byte array code file).

rFXGen Standalone comes with command-line support for batch conversion and audio playing. For usage help:

rfxgen.exe --help

Command-line

rFXGen desktop version comes with command-line support for batch sound generation and cli sounds playing. For usage help:

rfxgen.exe --help

USAGE:
    > rfxgen [--help] --input <filename.ext> [--output <filename.ext>]
             [--format <sample_rate>,<sample_size>,<channels>] [--play <filename.ext>]

OPTIONS:
    -h, --help                      : Show tool version and command line usage help
    -i, --input <filename.ext>      : Define input file.
                                      Supported extensions: .rfx, .wav, .qoa, .ogg, .flac, .mp3\n
    -o, --output <filename.ext>     : Define output file.
                                      Supported extensions: .wav, .qoa, .raw, .h
                                      NOTE: If not specified, defaults to: output.wav\n
    -g, --generate <preset>            : Generate file based on the preset.
                                      Supported presets: coin, laser, explosion, powerup, hit, jump, blip
    -f, --format <sample_rate>,<sample_size>,<channels>
                                    : Define output wave format. Comma separated values.
                                      Supported values:
                                          Sample rate:      22050, 44100
                                          Sample size:      8, 16, 32
                                          Channels:         1 (mono), 2 (stereo)
                                      NOTE: If not specified, defaults to: 44100, 16, 1
    -p, --play <filename.ext>       : Play provided sound.
                                      Supported extensions: .wav, .qoa, .ogg, .flac, .mp3

Technologies

This tool has been created using the following open-source technologies:

• raylib - A simple and easy-to-use library to enjoy videogames programming
• raygui - A simple and easy-to-use immediate-mode-gui library
• tinyfiledialogs - File dialogs for desktop platforms

Handmade Software

rFXGen is handmade software, it has been meticulously developed using the C programming language, with great attention put on each line of code written. This approach usually results in highly optimized and efficient code, but it is also more time-consuming and require a higher level of technical skills. The result is great performance and small memory footprint.

rFXGen is self-contained in a single-executable of about 1.5 MB, it could fit on a floppy disk.

Issues & Feedback

Note that the free version of rFXGen comes with no support. Still, tool issues and feedback can be reported at https://github.com/raysan5/rfxgen. They are reviewed with low-priority.

For additional support, priority issues review or tool customization requirements, please contact ray[at]raylibtech.com

License

rFXGen source code is distributed as open source, licensed under an unmodified zlib/libpng license.

rFXGen binaries are completely free for anyone willing to compile it directly from sources.

In any case, consider some donation to help the author keep working on useful software development.

Copyright (c) 2015-2026 raylib technologies (@raylibtech) / Ramon Santamaria (@raysan5)