In the evolving world of music production, mastering is no longer reserved for industry professionals with expensive studio gear. Thanks to artificial intelligence, musicians of all levels can now access powerful mastering tools online—many of them completely free. These AI-driven platforms analyze your audio and apply industry-standard mastering techniques, such as EQ, compression, stereo enhancement, and loudness adjustment, all in minutes. Whether you’re a bedroom producer or an indie artist ready to release your next track, here are the best free online mastering tools you should try right now.
1. BandLab Mastering
BandLab is a free, cloud-based music creation platform that offers unlimited AI mastering without compromising quality. Users can upload WAV or MP3 files and choose from four mastering styles: Universal, Fire, Clarity, and Tape. Each preset provides a different tonal character, allowing you to tailor your master to your genre or personal taste.
BandLab’s biggest strength is its ecosystem. If you use BandLab’s free DAW, your workflow becomes seamless—you can record, mix, and master all in one place. With no sign-up required for mastering and results delivered in under a minute, BandLab is arguably the most convenient and reliable free option available today.
2. LANDR (Free Tier)
LANDR is one of the most recognized names in AI mastering. While its premium plans offer more features and high-resolution file outputs, LANDR also provides a free tier that allows you to master a limited number of MP3 tracks per month. The mastering engine uses machine learning to analyze your mix and enhance it based on professional standards.
For those testing the waters or producing demo tracks, LANDR’s free plan is an excellent starting point. Plus, you can preview the mastered audio before downloading, giving you a taste of what its AI is capable of.
3. MasteringBOX (Free MP3 Mastering)
MasteringBOX provides a straightforward and effective AI mastering tool with a free plan that supports MP3 files. Its interface is beginner-friendly, and users can choose a tonal reference—such as “Warm,” “Bright,” or “Balanced”—to slightly customize the result. The engine has seen upgrades in 2025, providing better clarity, dynamic control, and improved loudness matching.
While the free version doesn’t offer WAV output or batch processing, it’s still a valuable tool for hobbyists, podcasters, and artists preparing demos.
4. Chosic AI Mastering
If you’re looking for speed and simplicity, Chosic’s AI mastering tool is worth checking out. With no sign-up or subscription required, Chosic lets you upload a file and receive a mastered version within seconds. It may not offer customization options, but it’s perfect for quick turnarounds or experimenting with rough mixes.
Mastering your music doesn’t have to be expensive or complicated. Free AI tools like BandLab, LANDR, MasteringBOX, and Chosic provide accessible ways to enhance your tracks and prepare them for streaming, sharing, or distribution. While these tools might not replace the nuance of a professional human engineer, they come impressively close—and for zero cost, they’re well worth your time.