BillyPro brings the legacy of BillyMp3 to a super-lightweight Windows music player

Inspired by BillyMp3, BillyPro is a minimalist Windows music player with instant launch, low CPU usage, gapless playback, DSP effects, portable settings, keyboard controls, and support for all formats

Razvan Serea News Reporter Neowin · Mar 15, 2026 10:30 EDT with 2 comments

BillyPro

BillyPro is a blazing-fast, feather-light music player for Windows, built as a pure native Win32 C++ app inspired by the legendary BillyMp3. It launches instantly, sips under 5MB of RAM, and stays at ~0% CPU during playback thanks to BASS handling audio on its own thread. There’s no runtime, no frameworks, and no bloat—just a tiny executable that opens in under 100ms and gets out of your way while playing anything you throw at it, from MP3 and FLAC to OPUS, AIFF, and more.

Despite its minimal footprint, BillyPro packs real power: gapless-friendly playback, a DSP chain with Bass Boost, Mono, and Normalization, full keyboard-driven controls, drag-and-drop playlists, a vivid LED-style volume/peak display, portable INI-based settings, batch conversion tools, and a full tag viewer with artwork support. Drop it anywhere and start listening—no installer, no nagging, no nonsense.

BillyPro key features:

Audio

Plays every format you'll ever need - MP3, FLAC, AAC, OGG, WAV, WMA, OPUS, AIFF, M4A and more via the BASS audio library
Gapless-friendly playback with seamless track transitions
DSP effects chain - Bass Boost with true peak limiting, Mono mixdown, Normalization
Bass Boost with a proper brickwall limiter - boosts low frequencies without introducing clipping or distortion. When the bass hits the ceiling, all frequencies duck together cleanly
Mono - fold stereo to mono for single-speaker setups or hearing checks
Normalization - scans track peak and adjusts volume so every song plays at a consistent level

Controls

Keyboard shortcuts for everything - Space to play/pause, N/P for next/previous, S for shuffle, R for repeat
Seek bar - click anywhere to jump, hold left/right arrow to scrub
Volume bar with segmented LED display - shows volume fill, audio peak hold, and live bass FFT in red
Peak meter with hold and decay
System tray - minimize to tray, restore on double-click

Playlist

Drag & drop files and folders directly onto the window
Multi-select with Ctrl+Click and Ctrl+A
Drag to reorder tracks
Delete key removes selected tracks
CTRL+F search - filter your playlist instantly

Options

Adjustable Bass Boost parameters - low freq, high freq, gain (dB)
Settings saved to BillyPro.ini next to the executable - no registry pollution, fully portable
Convert dialog - batch convert your library to MP3/OGG/FLAC/WAV with quality control

Audio Information