# How to Master a Song Online for Free (Step by Step)

> A simple step-by-step guide to mastering a song online for free in your browser — upload an MP3 or WAV, pick a style, compare and download a streaming-ready master.

[Back to Mastering](/mastering)

# 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](/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](/mastering) — drop in an MP3 or WAV, pick a feel, and download a streaming-ready master. Nothing leaves your device.

## Related guides

- [Mixing vs mastering](/mastering/mixing-vs-mastering)
- [What is LUFS?](/mastering/what-is-lufs)
- [Master for Spotify, Apple & YouTube](/mastering/master-for-spotify-apple-youtube)

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Source: https://onloopin.com/mastering/how-to-master-a-song-online