AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I master a track to -14 LUFS for Spotify online without uploading it?

Open AnyTool's Audio Mastering, drop in your track, and hit a one-click target (Spotify/YouTube -14 LUFS, Apple -16, Club -9) — it applies EQ, multiband compression and a true-peak limiter, then a two-pass loudness normalize lands the master on target within about ±0.5 LU at a safe -1 dBTP. Live before/after LUFS, true-peak and spectrum meters update as you adjust, you can A/B instantly, and you can export WAV (16/24-bit), MP3, M4A, OGG or FLAC. Everything runs in your browser with the Web Audio API and a self-hosted ffmpeg engine — no upload, no paywall, no watermark, no CDN.

  • One-click streaming targets: -14 LUFS (Spotify/YT), -16 (Apple), -9 (club)
  • EQ + multiband compression + true-peak limiter with two-pass loudnorm
  • Live before/after LUFS, true-peak (dBTP) and spectrum metering + A/B
  • 100% in your browser — no upload, no paywall, no watermark, no CDN

What is

Audio mastering

Mastering is the final polish of a mix — balancing tone with EQ, controlling dynamics with compression and limiting, and normalizing loudness to a target (e.g. -14 LUFS for Spotify) while keeping true peaks under a safe ceiling (about -1 dBTP). A client-side mastering tool processes, measures (LUFS/true-peak) and previews this in the browser with Web Audio and ffmpeg, without uploading the track.

Audio Tools

Related terms

LUFStrue peaklimitermultiband compressionloudnorm

How to Master Audio

Master a track to a streaming loudness target in your browser.

45 secWeb browser
  1. 1

    Add your track

    Drop in your mix — it stays on your device and its LUFS/true-peak are shown.

  2. 2

    Pick a target

    Choose a one-click target (e.g. -14 LUFS) or adjust EQ, compression and the limiter live.

  3. 3

    Master & export

    Export WAV (16/24-bit), MP3, M4A, OGG or FLAC — nothing is uploaded.

Result: A mastered audio file

Frequently Asked Questions

No — mastering runs entirely in your browser.

Unreleased tracks never leave your device, unlike eMastered, LANDR, BandLab and CloudBounce, which all upload to the cloud and gate downloads behind preview-only or paid tiers.

Yes — a two-pass loudness normalize lands the target within about ±0.5 LU.

One-click targets for Spotify/YouTube (-14), Apple (-16), Amazon (-14 at -2 dBTP) and club (-9) build the chain and normalize precisely, with before/after LUFS and true-peak shown so you can verify it.

WAV (16/24-bit), MP3 320, M4A, OGG and FLAC.

One master exports to every format via a self-hosted ffmpeg engine, including true 24-bit WAV — BandLab is 16-bit-only and free MasteringBOX is MP3/M4A-only.

Detailed Explanation

Methodology

How the Audio Mastering Works

AnyTool masters audio entirely in the browser with a dual engine. A live Web Audio graph applies a Linkwitz-Riley multiband split with per-band compression, tonal EQ, makeup gain and an AudioWorklet look-ahead true-peak limiter (ceiling around -1 dBTP), while a parallel BS.1770/EBU R128 K-weighting meter shows momentary/short-term/integrated LUFS and true-peak before and after — so every slider and one-click target (Spotify/YouTube -14, Apple -16, club -9) is heard instantly with an A/B toggle. The final master is rendered in an OfflineAudioContext, then a self-hosted single-threaded ffmpeg.wasm engine (bundled core, no CDN) runs a two-pass loudnorm to land the target within about ±0.5 LU and encodes WAV (16/24-bit), MP3 320 (libmp3lame), M4A (AAC), OGG (libvorbis) or FLAC.

  • Runs client-side — the track is never uploaded
  • Multiband compression + EQ + true-peak limiter (Web Audio)
  • Live before/after LUFS, true-peak (dBTP) and spectrum metering
  • Two-pass ffmpeg loudnorm lands the target within ~±0.5 LU
  • Self-hosted ffmpeg core (bundled) — no CDN
  • Export WAV (16/24-bit), MP3 320, M4A, OGG or FLAC
Privacy & Security

Privacy vs Cloud Mastering Services

eMastered, LANDR, BandLab, CloudBounce, Songmastr, MasteringBOX and major desktop suites Podcast all upload your track to the cloud, and most gate downloads behind preview-only or paid tiers (or output MP3-only on free plans). AnyTool masters on the device, so unreleased tracks never leave the browser, with no upload, paywall, watermark or sign-up. It also shows the actual before/after LUFS and true-peak numbers and exports true 24-bit WAV — where BandLab is 16-bit-only and analyzers like mastering.to measure but do not master.

Mastering: AnyTool vs typical tools
CapabilityAnyToolTypical tools
Data handlingIn your browserUploaded to cloud
LUFS / true-peak readoutYes (before/after)Often hidden
Exact target landingYes (two-pass)Varies
Output formatsWAV(16/24)/MP3/M4A/OGG/FLACOften MP3 only (free)
Paywall / watermarkNoneCommon

AnyTool is a privacy-first client-side mastering tool — processing runs locally and nothing is uploaded.