Free three-band upward/downward multiband compressor originally from Ableton's Multiband Dynamics preset.
VST3supportedAUsupportedAAXsupportedCLAPnot supportedWINsupportedMACsupportedLNXnot supported
Checked September 2026 · 3 picks
Best Free Mastering Tools for Windows (2026)
The best free mastering tools for Windows are OTT, TDR Kotelnikov and TDR VOS SlickEQ. OTT is best for aggressive multiband upward/downward compression. TDR Kotelnikov is best for transparent mastering-bus compression. TDR VOS SlickEQ is best for musical EQ shaping with vintage analog character.
Free 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 supported
Questions people ask
OTT by Xfer Records. It is best for aggressive multiband upward/downward compression and is free to use.