Shape tone, control dynamics, and match your loudness target—all with free, private processing in your browser.
✓ EQ, compression & limiting✓ Podcast and music presets✓ No uploads or paid AI
MASTERING WORKSPACE
Audio Mastering Studio
Import, refine, listen and export your track.
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Start with your audio
Drop an audio file or choose one from your device. Decoding support depends on your browser.
Up to 100 MB (lower on smaller devices) · Mono or stereo · Duration depends on available memory · Never uploaded
Recording—
WAVEFORM / PLAYBACKReady to master
0:00 / 0:00
Original loudness—Estimated LUFS
Mastered loudness—Estimated LUFS
Mastered peak—dBFS · sample peak
Compression—Max gain reduction
Crest factor—Peak above RMS
Stereo correlation—−1 to +1 · N/A for mono
No diagnostics yet.
Loudness readings are estimates using K-weighted gating (N/A for silence or clips shorter than 400 ms). Sample-peak limiting is not an oversampled true-peak guarantee.
01 / START WITH A SOUND
Mastering chain
Choose a starting point, then customize it. Edits require a fresh mastering pass.
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Three-band equalizer
Control warmth, body and clarity
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Cleanup and edge fades
Filter low rumble and soften abrupt recording boundaries
Off at 0 Hz; 20–120 Hz activates a 12 dB/octave filter.
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Dynamics compressor
Even out loud and soft passages
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Normalization & peak limiter
Set intended loudness and output ceiling
The peak limiter may prevent reaching a requested LUFS target. Achieved loudness is measured and reported after processing.
BUILT FOR REAL AUDIO
From raw recording to finished sound
No subscription, cloud uploads, mystery AI model or unnecessary effects.
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Balance your tone
Fine-tune warmth, mids and top-end with actual biquad EQ filters.
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Control dynamics
Adjust threshold, ratio, timing and makeup gain. A stereo-linked limiter contains sample peaks.
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Export with confidence
Compare original and mastered audio, inspect achieved levels and download a WAV.
Frequently asked questions
Does mastering require paid AI or an account?
No. The algorithms run locally with JavaScript and Web Audio. There are no paid models, remote uploads or account requirements.
Can I master MP3, AAC, M4A or FLAC files?
Input decoding depends on the codecs available in your browser. WAV export is supported in all three listed bit depths. Export to MP3 or AAC is not currently offered.
Are the loudness and peak values certified?
No. Integrated LUFS is calculated with approximate K-weighting and gating inspired by BS.1770. Peak readings and limiting are sample-based, not certified oversampled dBTP. Check delivery specs using a validated external meter.
Why might normalization miss my loudness target?
Peak limits and dynamics can make a desired loudness impossible without further compression or clipping. The studio reports the achieved result rather than pretending to meet the target.
What about long podcasts?
Browser decoding reads the entire file into memory, so device resources impose a duration limit. Large multi-hour recordings should be edited into manageable segments or mastered with a desktop audio editor.
Processing
Mastering your audio on this device…
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Using Audio Mastering Studio
Import audio or try the generated demo, choose a starting preset and adjust tone/dynamics. Apply, compare the original and mastered audio, and inspect achieved measurements before exporting WAV. Keep the original separately.
This is conventional local DSP, not AI mastering. Loudness is an estimate, not a certified BS.1770 meter, and limiting controls sample peaks rather than intersample true peak. Presets do not guarantee platform compliance or achievement of target loudness. Decoding may resample and requires whole-file memory. No MP3/AAC export, multiband dynamics, de-essing, noise repair or metadata retention is supplied.
Master a supported audio file with local DSP
Import audio, shape tone with the available equalization and dynamics controls, compare the processed sound with the source, and export PCM WAV. This is conventional local audio processing rather than AI mastering.
Example workflow
Keep an original copy and import a supported audio file within the whole-file memory budget.
Adjust EQ and dynamics gradually, preview changes, and compare with the source at a consistent listening level.
Review estimated loudness and sample peak, then export WAV and check it in the intended delivery workflow.
Authored example: For a spoken-word recording, make a small EQ adjustment and use gentle peak control, then listen for harshness and pumping. Treat displayed loudness as an estimate, not a certified delivery measurement.
Limits: Loudness estimates are not certified BS.1770 metering, and the limiter controls sample peaks rather than intersample true peak. Presets do not guarantee a platform target. Decoding may resample and uses whole-file memory; MP3/AAC export, multiband dynamics, de-essing, noise repair and metadata retention are not supplied.
Audio Mastering Studio questions
Does a preset guarantee a streaming-platform loudness target?
No. Presets are starting points, and the displayed loudness is an estimate rather than certified BS.1770 measurement.
Can I export MP3 or AAC?
No. The supported export is WAV; keep the original separately if you need another format or its metadata.
