Master your track in your browser for free. Loudness optimization for Spotify, Apple Music, SoundCloud and more.
How it works
1. Upload your track. Drop your music into the tool (WAV, MP3 or any other common audio format).
2. Choose your sound and destination. Pick a mastering style, load a reference track, or keep it clean and neutral. Then select where your music is headed: Spotify, Apple Music, SoundCloud, YouTube, Bandcamp or the club. The correct loudness is set automatically.
3. Compare and export. A/B your master against the original in real time, then download it as MP3, WAV or AIFF.
Why master with Audiomastering.io
100% private, nothing gets uploaded. Unlike cloud mastering services, Audiomastering.io processes your audio entirely in your browser. Your unreleased music never leaves your device.
Free exports without limits. Export a clean, loudness-optimized master as 320 kbps MP3 or 16-bit WAV for free. No account is required.
Platform-perfect loudness. The tool automatically measures your track’s loudness (LUFS) and true peak the same way streaming services do, then hits the right target for your chosen platform. Your music is never turned down or flattened by normalization.
Hear the difference before you commit. Switch instantly between your original mix and the master before exporting the track.
Go further with Pro. Genre mastering styles (House, Techno, Hip-Hop and more), reference track matching, advanced controls (EQ, compression, width) and 24-bit WAV and AIFF export are included in Pro. You can try all of these features before upgrading.
What is audio mastering?
Audio mastering is the final step of music production, where a finished mix is polished for release: overall tonal balance is corrected, dynamics are controlled, stereo width is refined, and the track is brought to the loudness level that streaming platforms target. A good master translates well everywhere, from earbuds to car speakers to a festival PA.
Traditionally, mastering required an experienced engineer and specialized studio hardware. Online mastering tools like Audiomastering.io automate that process: the tool analyzes your mix, applies EQ, compression and true-peak limiting, delivering a release-ready file in minutes.
Mastering vs. mixing: what’s the difference?
Mixing balances the individual elements inside a song (vocals, drums, bass, synths) using volume, panning and effects on separate tracks. Mastering happens after the mix: it treats the finished stereo file as a whole, refining tone, dynamics and loudness so that the track sounds professional and consistent on every system and platform. In short: mixing shapes the song, mastering prepares it for release.
Loudness targets for different destinations
Every major streaming service uses loudness normalization. It measures how loud your track is (in LUFS) and turns it down if it exceeds the platform’s target. Mastering louder than the target gains you nothing. The platform simply reduces the volume, and the track loses punch and dynamics.
| Destination | Loudness target | True peak |
|---|---|---|
| Spotify | −14 LUFS | −1 dBTP |
| Apple Music | −16 LUFS | −1 dBTP |
| SoundCloud | −14 LUFS | −1 dBTP |
| YouTube | −14 LUFS | −1 dBTP |
| Bandcamp | −10 LUFS | −1 dBTP |
| Club | −8 LUFS | −0.8 dBTP |
Bandcamp and club playback do not use normalization at all, which is why those two targets are louder. Neither publishes an official target, so those figures reflect common practice. Nothing turns the track down afterwards, and music for the dancefloor is played on professional sound systems. Audiomastering.io sets all of these targets automatically based on the destination you choose.
How to prepare your mix for mastering
You’ll get the best results if your mix is properly prepared before mastering:
Fix the mix first. Mastering polishes a good mix, but it can’t repair a bad one. If the balance feels wrong, go back to mixing before you master.
Export a 24-bit WAV or AIFF at the sample rate of your project. Avoid mastering from an MP3 if you can.
Leave 3–6 dB of headroom. Your mix should peak around −6 to −3 dB, not at 0.
No limiter on your master bus. Remove any loudness maximizer from the mix. Loudness is handled at the mastering stage.
Frequently asked questions
Audio mastering is the final production step that prepares a mixed song for release. It optimizes tonal balance, dynamics, stereo image and loudness so that the track sounds professional and consistent across all playback systems and streaming platforms.
Yes. You can master your track and export it as a 320 kbps MP3 or 16-bit WAV for free, with no account needed and no upload limits. All Pro features (genre styles, reference matching, advanced controls, 24-bit WAV and AIFF export) can be tried for free. You only need to upgrade when you want to export with these features.
No. Audiomastering.io runs entirely in your browser. Your audio file is processed locally on your device and is never uploaded, stored or shared. This makes it one of the most private ways to master music online.
No. You can upload, master, compare and export your track without ever needing to create an account.
Spotify normalizes tracks to −14 LUFS with a recommended true peak of −1 dBTP. If your master is louder, Spotify turns it down at playback. Audiomastering.io targets −14 LUFS / −1 dBTP automatically when you choose Spotify as your destination.
LUFS (Loudness Units Full Scale) is the international standard for measuring perceived loudness. Unlike peak meters, which show the loudest single sample, LUFS measures how loud a track actually sounds to human ears over time. Streaming platforms use LUFS for loudness normalization.
True peak measures the actual maximum level of the audio signal, including peaks that occur between digital samples. Streaming services convert your file to lossy formats like Ogg Vorbis or AAC, which can push these inter-sample peaks higher. Keeping the true peak at or below −1 dBTP prevents distortion after that conversion.
Each service chose its own normalization reference: Spotify, YouTube, SoundCloud and most others settled on −14 LUFS, while Apple Music uses −16 LUFS. Bandcamp and clubs use no normalization at all. That’s why a master optimized for one destination isn’t automatically ideal for another. It’s also why Audiomastering.io lets you pick the destination before mastering.
You can upload WAV, MP3 and most common audio formats supported by your browser. Free exports are available as 320 kbps MP3 and 16-bit WAV. 24-bit WAV and AIFF exports are included in Pro.
Reference mastering analyzes a track whose sound you like and matches your master’s tonal balance and stereo width to it. Instead of describing the sound you want, you simply show it to the tool. Reference track matching is a Pro feature in Audiomastering.io, and you can try it for free before upgrading.
Yes. You keep all rights to your music. Audiomastering.io claims no ownership of anything you master. You just need to own the rights to the audio you upload.
No. Loudness is only one part of mastering. A master also corrects tonal imbalances, controls dynamics, refines stereo width and ensures your track translates well on every system.