Normalize audio loudness to the exact LUFS target
Drop in an episode or a whole batch. We measure its loudness the way the platforms do, bring it to the Apple Podcasts, Spotify or broadcast target, hold the true peak under the ceiling — and then measure again, so the report proves the number instead of promising it.
MP3, WAV, M4A, FLAC, OGG, AAC — podcast episodes, voice recordings, music masters
How it works
1. Upload
Add one episode or a whole season. MP3, WAV, M4A, FLAC and OGG all work, stereo or mono.
2. Pick the target
Choose the platform preset — podcast, streaming or broadcast — or set a custom LUFS value. Mono podcast files automatically get the -19 LUFS target.
3. Check the report
Every file reports integrated loudness, true peak and loudness range, before and after. If a result lands outside ±1 LUFS of the target, the report says so in plain words.
4. Download
Results come down as one ZIP with the normalized files and a CSV loudness report. Registered users get 72-hour history and an email when big batches finish.
The targets, in one table
| Destination | Integrated loudness | Note |
|---|---|---|
| Apple Podcasts (stereo) | -16 LUFS | True peak at or below -1 dBTP |
| Apple Podcasts (mono) | -19 LUFS | Mono summed to both ears plays about 3 LU hotter |
| Spotify / YouTube / Tidal | -14 LUFS | The streaming reference level |
| Broadcast — Europe (EBU R128) | -23 LUFS | Programme loudness for TV and radio |
| Broadcast — US (ATSC A/85) | -24 LUFS | True peak at or below -2 dBTP |
| Custom | Any target from -30 to -10 LUFS | For platform specs that are not on the list |
Built for people who publish on a schedule
Batch the whole season
Browser tools make you babysit one file at a time. Paid plans normalize up to 50 files in one upload, all to the same target, with one report covering every episode.
Verified, not promised
Every output is re-measured after processing. The number in your report is the number the platform will measure — not a guess from the settings you picked.
No jingle. No watermark.
Free output from the famous names can carry a spoken jingle. Ours never does, on any plan. Your listeners hear your show, not our ad.
Frequently asked questions
What loudness should a podcast be?
Apple Podcasts asks for about -16 LUFS integrated loudness for stereo episodes (give or take 1 dB), with true peak no higher than -1 dBTP. Mono episodes should be -19 LUFS, because a mono signal plays about 3 LU hotter when it is summed into both ears. Pick the Podcast preset above and we apply the right target for your file automatically.
How is this different from making a file louder in an editor?
Peak normalization only looks at the loudest sample. Loudness normalization measures how loud the whole programme feels, using the ITU-R BS.1770 method the platforms themselves use. A file can peak at 0 dB and still measure -25 LUFS — quiet. We measure first, then apply gain with a true-peak ceiling, then measure again and show you both numbers.
Why two passes?
A single pass has to guess. Measuring first lets us apply the exact correction in one clean, linear step whenever the source has enough headroom, which keeps the dynamics untouched. When the source is already slammed against the ceiling we fall back to dynamic mode and say so in the report.
Do you add a watermark or a jingle?
Never, on any plan — including the free one. Your file comes back with only the loudness changed. Some well-known tools stamp a spoken jingle on free output; we think that is a bad trade and we simply do not do it.
What is the largest file I can normalize?
Free accounts normalize files up to 100 MB and 60 minutes of audio a month. Starter goes to 500 MB and 10 hours a month; Pro to 2 GB and 30 hours. Processing runs on our server, so long episodes are normal work, and we email you when a big batch is done.
How long do you keep my files?
Uploads and results are deleted automatically after 72 hours. Files are processed on our own server and are never shared. See the privacy policy for the details.