How to Master a Song Online for Free
Updated June 2026 · by Loopin
You don't need a studio or paid software to get a clean, loud, release-ready master. With Loopin Mastering you can master a song online for free, right in your browser — and because everything runs on your device, your file is never uploaded. Here's the whole process.
1. Bounce a stereo mixdown
Export your finished mix as a single stereo WAV (best quality) or MP3. Leave a little headroom in the mix — aim for peaks around −3 to −6 dB before mastering. Don't put a limiter on the master bus; mastering will handle loudness.
2. Upload it to the tool
Open Loopin Mastering and drag your file onto the drop zone (or browse for it). It's analysed on the spot — loudness, true peak, dynamics and stereo width — so you can see where your track starts.
3. Pick a feel
Choose the style that fits your genre: Warm, Punchy, Crisp, Wide, Vintage, Club, Lo-fi or Cinematic. Each is a full mastering chain — corrective EQ, multiband compression, character EQ, saturation, stereo and a true-peak limiter — tuned to a sound.
4. Compare Original vs Mastered
Use the A/B toggle to flip between your original and the master. It's loudness-matched, so you judge the tone and not just "louder sounds better". Toggle mono to check the track still holds up on phone and club speakers.
5. Download your master
Hit download and you get a mastered WAV, auto-targeted to about −14 LUFS with a −1 dBTP true-peak ceiling — the sweet spot for streaming. Free, no account, nothing uploaded.
Tips for a better master
- Fix problems in the mix first — mastering enhances, it can't rescue a clipped or muddy mix.
- Reference a commercial song in your genre and match by ear, level-matched.
- Don't chase maximum loudness; −14 LUFS is plenty for streaming and keeps your dynamics.
Try it now: open the free Loopin Mastering tool — drop in an MP3 or WAV, pick a feel, and download a streaming-ready master. Nothing leaves your device.