EQ · compressor · limiter
Light mastering
Processed on your device (no upload)
Choose a track
or click to choose
MP3, WAV, M4A, AAC, FLAC, OGG, Opus, AIFF and more — plus the audio of MP4, MOV, WebM and other video
EQ, compressor, reverb, saturation and limiter, applied together. Leave the detail to a preset, and export at the loudness streaming services play back at.
Related purposes
What this tool does
- Matches streaming loudness
- Streaming services normalise loudness on playback. Exporting to that target keeps your track from sounding quiet next to others, and avoids compressing it harder than playback allows for.
- Compare before and after
- Hold "hear the original" to switch to the unprocessed audio, so you can compare the change at the same point in the track.
- Displayed figures are measured
- Loudness and peak are measured from the exported audio itself with BS.1770, not predicted from the settings.
How to use
Choose a track
On step 1, drag and drop the track you want finished, or click to choose it. Once it has loaded, confirm to move on.
Adjust the sound
On step 2, picking a preset sets every control at once. From there you can move controls individually, press a stage to switch it off, or drag the stages into a different order.
Listen, then export
Confirming step 2 rebuilds the whole track and measures its loudness and ceiling. On step 3 you play it back, hold "hear the original" to compare against the untreated audio, and save as WAV or MP3.
What the controls mean
- LUFS (loudness)
- Loudness measured the way hearing works rather than by raw level. Streaming services play back at roughly -14 LUFS, so a master made louder than that is simply turned down again.
- True peak
- The real maximum, including what happens between samples. A file pushed to exactly 0 dB will exceed it the moment an encoder touches it, which is why the ceiling here defaults to -1 dBTP.
- EQ (low, mid, high)
- Level per band. Mastering adjustments usually stay inside about ±3 dB. If more is needed, consider fixing it in the mix instead.
- Dynamics (threshold, amount)
- Holds the loudest parts down so the rest can come up. A lower threshold catches more of the track; a higher amount holds it harder.
- Space (reverb)
- A short tail for depth. On a master this is seasoning — too much and the edges of everything go soft.
- Saturation
- Rounds the corners off peaks. It buys loudness at the same measured level without the brittleness that hard limiting alone produces.
Frequently asked questions
- Is my audio uploaded?
- No. Reading, processing and exporting all happen inside your browser, and the audio is never sent anywhere.
- Does this replace a mastering engineer?
- It does not. Mastering is someone deciding with their ears; this tool applies a fixed chain and matches a loudness target. Use it to tidy a track before release, or to make a set of demos sit at the same level.
- Which preset should I pick?
- Clear Coat if you are unsure — it tidies without changing the character. From there: Warm Wax if it sounds harsh, Bright Polish if it sounds dull, Deep Gloss if it lacks weight, Wide Sheen if it sounds flat.
- What target loudness should I use?
- About -14 LUFS for streaming. Louder targets of -9 to -12 exist for playback at volume, but you spend dynamic range to get there.
- Why does exporting take a moment?
- Loudness is matched by measuring the actual output. The track is rendered once to measure it, and again with the difference applied, so exporting takes roughly two passes.
- Which formats are supported?
- MP3, WAV, M4A, AAC, FLAC, OGG and Opus, plus the audio track of video files. Exports are WAV or MP3.