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Free · In-browser · No upload

Mastering Studio.

A browser mastering suite for approximate stem rebalance, transient shaping, reference EQ and a reorderable chain of bass control, exciter, width, glue and loudness maximization. Preview critically before export.

Before-and-after illustration of Mastering Studio: Unmastered mix becomes Release master through Shape and maximize.
Before → process → afterSee the signal story, then hear it in the workspace.

DYNAMICS MAP

Mastering Chain View

Follow the level decision, not just the waveform. The important story is how the detector reacts, where gain starts moving and whether the result stays controlled without flattening the performance.

Before-and-after illustration of Mastering Studio: Unmastered mix becomes Release master through Shape and maximize.
Unmastered mixShape and maximizeRelease master
A threshold-led gain path: peaks cross the decision line, the processor responds, and the output envelope becomes more deliberate.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
  1. Unmastered mix

    Start with the right material

    Checking and polishing a finished stereo mix before sharing a draft.

  2. Shape and maximize

    Understand the transformation

    A heuristic chain combines stem-style rebalance, transient shaping, match EQ, bass control, glue compression, limiting and dither.

  3. Release master

    Verify the usable result

    A locally rendered master that you can compare with the original and download.

LUFS and true peak

Where this workflow stops

This is not a certified mastering service. Loudness is an in-browser estimate, the limiter is dynamics-based, and the result still needs listening checks on several systems.

THREE-PASS CHECK

Make the final decision by ear

  • Compare at matched loudness so “louder” is not mistaken for “better”.
  • Inspect the loudest transient and the quietest useful detail.
  • Leave enough headroom for the next processing or delivery stage.

How to master a track in your browser

  1. Drop your final mix (MP3, WAV, FLAC…) — it is decoded on your device and is not uploaded to AudioWrench.
  2. Pick a genre target and hit Analyze & build my chain, or drop a reference track to match its tonal balance.
  3. Press Play and shape the sound live: rebalance stems, revive transients, EQ, bass control, exciter, width, glue and maximizer — flip A/B anytime to compare with the original.
  4. Render, check the LUFS readout and the MP3 codec preview, then export WAV (16-bit dithered or 32-float) or MP3 320.

Mastering Studio combines EQ, dynamics and stereo tools in one signal path, with a live spectrum and gain-reduction metering to help compare decisions. Its assistant is a heuristic starting point, not an automated guarantee of release readiness. The maximizer uses Web Audio dynamics processing and sample-peak metering; it has not been verified as a true-peak or brick-wall limiter. Preview on trusted headphones or monitors and compare the result with the original before export.

Wear headphones or trust monitors you know: mastering decisions made on laptop speakers rarely survive the car test. The codec preview helps too — hearing your master through MP3 at 128 kbps before release beats finding out from a listener.

Mastering Studio: quick answer and technical limits

Quick answer: A browser mastering chain that analyzes a mix, applies corrective EQ and dynamics, and renders a louder preview against a chosen loudness target.

Best for
Checking and polishing a finished stereo mix before sharing a draft.
How it works
A heuristic chain combines stem-style rebalance, transient shaping, match EQ, bass control, glue compression, limiting and dither.
What you get
A locally rendered master that you can compare with the original and download.

Know before you use it: This is not a certified mastering service. Loudness is an in-browser estimate, the limiter is dynamics-based, and the result still needs listening checks on several systems.

Privacy: Selected audio is processed in this browser and is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Privacy details →

FAQ

How do I master a song online for free?
Drop your final mix into the Mastering Studio, pick a genre target and press Analyze — the assistant measures loudness and tone, then sets up the EQ, bass control, glue compressor and maximizer for you. Audition the chain live, tweak any module, then render and export MP3 or WAV. Everything runs in your browser, free, with no upload.
Can I really adjust vocals or drums inside a finished mix?
Yes — the Stem Rebalance module separates the stereo file into bass, vocals, drums and other instruments using frequency and transient analysis, then lets you raise or lower each part before the rest of the chain. It is an honest approximation rather than studio-grade neural separation, but a couple of dB of correction works remarkably well on most mixes.
What loudness should my master hit for Spotify or YouTube?
Normalization policies vary by service, content and user settings. The Pop/Streaming preset uses about -14 LUFS as a practical reference, while other genres may choose different targets. The meter is a browser-based estimate, and its peak readout is sample peak rather than certified true peak.
Is this mastering tool really free, and is my track uploaded?
It is free with no signup or watermark. Audio processing stays on your device, but input is capped at 200 MB and a long mix may still exceed available browser memory or take longer to render.