Free three-band upward/downward multiband compressor originally from Ableton's Multiband Dynamics preset.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supported
Checked September 2026 · 13 picks · 13 compared
Best Free Mastering Tools (2026)
The best free mastering tools are OTT, BandLab Mastering and HoRNet Magnus Lite. OTT is best for aggressive multiband upward/downward compression. BandLab Mastering is best for bandlab users who want free instant AI mastering with genre-style presets. HoRNet Magnus Lite is best for loudness limiting.
- FREE
#2BandLab Technologies
BandLab Mastering
Free AI-powered instant mastering built into the BandLab music-making platform.
VST3not supportedAUnot supportedAAXnot supportedCLAPnot supportedWINnot supportedMACnot supportedLNXnot supported+ Web · iOS · Android - FREE
#3HoRNet
HoRNet Magnus Lite
A free limiter and clipper.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supported - FREEpaid $14.99+
#4Kits.ai
Kits AI Mastering
One-click AI mastering with genre presets and reference tracks.
VST3not supportedAUnot supportedAAXnot supportedCLAPnot supportedWINnot supportedMACnot supportedLNXnot supported+ Web A free stereo imaging plugin with width control and vectorscopes.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedFree wideband mastering compressor combining high fidelity control with musical flexibility.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedFree mixing/mastering EQ with four vintage-modeled EQ character options.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedA free linear-phase 16-band graphic equalizer suited to mixing and mastering.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedA free mid-side encoder/decoder utility.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedA free mid/side stereo widener.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedA free stereo widener that stays mono-compatible.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedA free loudness metering plugin for measuring perceived loudness against TV, streaming and broadcast standards.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supportedA loudness meter with streaming presets, dynamics graph and export.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supported
Comparison table
| Name | Price | Formats | Runs on |
|---|---|---|---|
| OTTXfer Records | Free | VST3, AU, AAX | Windows, macOS |
| BandLab MasteringBandLab Technologies | Free | Web app, iOS app, Android app | Web, iOS, Android |
| HoRNet Magnus LiteHoRNet | Free | AU, VST, VST3, AAX | Windows, macOS |
| Kits AI MasteringKits.ai | Free | Web | Web |
| Ozone ImageriZotope | Free | AU, AAX, VST2, VST3 | Windows, macOS |
| TDR KotelnikovTokyo Dawn Records | Free | VST3, AU, AAX | Windows, macOS |
| TDR VOS SlickEQTokyo Dawn Records | Free | VST3, AU, AAX | Windows, macOS |
| Voxengo Marvel GEQVoxengo | Free | VST, VST3, AU, AAX | Windows, macOS |
| Voxengo MSEDVoxengo | Free | VST, VST3, AU, AAX | Windows, macOS |
| Voxengo Stereo TouchVoxengo | Free | VST, VST3, AU, AAX | Windows, macOS |
| WiderPolyverse Music | Free | VST2, VST3, AU, AAX | Windows, macOS |
| Youlean Loudness MeterYoulean | Free | VST2, VST3, AU, AAX | Windows, macOS |
| Youlean Loudness Meter 2 ProYoulean | Free | VST2, VST3, AU, AAX, Standalone | Windows, macOS |
Questions people ask
OTT by Xfer Records. It is best for aggressive multiband upward/downward compression and is free to use.
OTT, HoRNet Magnus Lite, Ozone Imager, TDR Kotelnikov, TDR VOS SlickEQ, Voxengo Marvel GEQ, Voxengo MSED, Voxengo Stereo Touch, Wider, Youlean Loudness Meter, Youlean Loudness Meter 2 Pro.