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AI Mastering - Polish Your Track in One Click

Drop in a mix and get an analysis-driven master: tone balanced, glued together and limited to the loudness you pick. Compare it with the original at matched volume, then download WAV or MP3.

The analysis, the processing chain and the export all run in this tab. Your file is never uploaded, and no AI service is called.

Drop an audio file here

or click to pick a track from your device

MP3, WAV, M4A, AAC, OGG, FLAC · up to 200 MB

What "AI" means here, and what the tool does

There is no cloud model behind this page. The "AI" is an analysis step: the tool measures your track's integrated loudness, true peak, crest factor, loudness range, stereo width and how its energy is split between lows, mids and highs, then compares that balance with a reference curve for finished pop, rock and electronic masters. The gap between your track and the curve decides how much each shelf filter and the compressor are set to do, scaled by the intensity slider and the preset you choose.

The chain itself is classic mastering order: a high-pass filter to clear sub-bass rumble, a gentle low-shelf, mid and high-shelf EQ, a glue compressor, an optional mid/side stereo width change, make-up gain and finally a look-ahead limiter. Everything it suggests is shown as sliders you can override before you render.

How the loudness target is reached

A limiter makes the track quieter as it catches peaks, so you cannot simply add the gain you think you need. The tool renders the chain, measures loudness with the ITU-R BS.1770 K-weighted, gated method used by streaming services, adds the estimated gain, limits, measures again and corrects, repeating until the result is within about 0.5 LU of your target. A last check measures the true peak with 4x oversampling and tightens the ceiling if any inter-sample peak is still above it.

If a target cannot be reached without breaking the ceiling, for example a very quiet, very dynamic recording pushed to -8 LUFS, the tool tells you where it landed and how hard the limiter is working instead of hiding it.

Choosing a preset, and hearing it fairly

Streaming aims for -14 LUFS with a -1 dBTP ceiling, which is close to what Spotify and YouTube play back at. Loud / Club goes to -9 LUFS for dense, punchy genres. Podcast / Voice uses -16 LUFS with a higher high-pass filter for speech. Warm, Bright and Gentle keep the streaming loudness and change the tone or how much processing is applied.

Louder almost always sounds better in a quick comparison, which is why the A/B player has a loudness-match switch. With it on, whichever version is louder is turned down to the level of the other, so you judge the tone and dynamics rather than the volume.

AI mastering blueprint

What the chain does and the limits of a browser-based master.

AnalysisIntegrated LUFS, true peak (4x oversampled), crest factor, loudness range, stereo width, low / mid / high balance.
ChainHigh-pass, 3-band EQ, glue compressor, mid/side width, make-up gain, look-ahead true-peak limiter.
Targets-14 LUFS streaming, -9 LUFS loud / club, -16 LUFS podcast; target and ceiling are adjustable.
AccuracyFinal loudness within about 0.5 LU of the target, true peak at or under the ceiling.
PreviewA/B toggle with optional loudness matching and a before / after waveform.
ExportWAV 16-bit (dithered), WAV 24-bit, MP3 320 kbps.
LimitsUp to 100 MB and 10 minutes per file; processed at your device's audio sample rate.
Not a replacement forA mastering engineer with trained ears and a treated room; it is an automatic starting point.

How to Master a Song Online for Free

Four steps, all inside your browser

  1. 01

    Add your mix

    Drop an MP3, WAV, M4A, FLAC or OGG up to 100 MB and 10 minutes. It is decoded locally and analyzed straight away.

    Export your mix with a little headroom (peaks around -3 dBFS) and without a limiter on the master bus.

  2. 02

    Pick a preset and intensity

    Streaming, Loud / Club, Podcast, Warm, Bright or Gentle. The tool suggests EQ, compression and width from your analysis.

    Fine-tune the loudness target, ceiling, EQ and stereo width if you disagree with a suggestion.

  3. 03

    Master and compare

    Press Master, then switch between Original and Mastered with loudness matching on.

    If the mastered version sounds flat, lower the intensity or the loudness target and master again.

  4. 04

    Download

    Save a 16-bit or 24-bit WAV, or a 320 kbps MP3.

    Use WAV if you will upload to a distributor; MP3 re-encoding can nudge peaks slightly.

Free Audio Tools

AI Mastering Questions

What the tool does, what it does not, and how to get a good result.

No. Decoding, analysis, the EQ and compressor chain, the limiter and the export all run in your browser. The "AI" is an automatic analysis that picks the settings; there is no server or model involved.
No. It gives a fast, consistent, loudness-accurate result and a good starting point, especially for demos, social uploads and podcasts. A human engineer still hears context, translation and creative intent that an automatic chain cannot.
-14 LUFS with a -1 dBTP ceiling is a safe target for Spotify, YouTube and most streaming services, which turn louder tracks down anyway. Use -9 LUFS only if you want a loud club-style master, and -16 LUFS for podcasts and spoken word.
The tool measures integrated loudness with the ITU-R BS.1770 K-weighted, gated method and iterates until it is within about 0.5 LU of the target. True peak is measured with 4x oversampling and kept at or under your ceiling.
With Match loudness on, it should not: the louder version is turned down to the other's level so you compare tone and dynamics. Turn it off to hear the real difference in level.
MP3, WAV, M4A, AAC, OGG and FLAC up to 100 MB and 10 minutes go in. You can export 16-bit or 24-bit WAV, or a 320 kbps MP3. The MP3 encoder is loaded on first use.
Yes, it uses standard Web Audio features available in current Safari, Chrome, Edge and Firefox. Long files need more memory, so very large files may be slow on older phones.

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