SALTWAVES.STUDIO

Podcast Loudness Checker

Built on 20 years of broadcast audio judgment, not a generic meter.

Analyze an episodeDrop an audio file here, or click to browseWAV, MP3, M4A or FLAC. Nothing is uploaded — the analysis runs on your machine.

Get the one-page spec sheet

Every platform target on a single page, plus a note when the next Saltwaves tool goes live. No newsletter, no schedule.

Platform targets

PlatformLoudness targetPeak limit / guidance
Apple Podcasts recommendation−16 LKFS ±1≤ −1 dBTP
Spotify music — Normal playback setting−14 LUFSDelivery advice: below −1 dBTP; below −2 if louder than −14 LUFS
ACX audiobook submission−23 to −18 dB RMS (not LUFS)Peak level ≤ −3 dBFS (ACX peak requirement)

LUFS and LKFS are the same measurement (ITU-R BS.1770) under two names.

RMS is a different measurement. The Audiobook catalogue preset uses a LUFS target and does not certify ACX compliance. ACX also has requirements for noise, encoding and other aspects of the file. Sources checked 15 September 2026: Apple Podcasts, Spotify music normalization, ACX submission requirements.

Choose a delivery target before adjusting levels

Integrated loudness describes the overall programme level. True peak estimates peaks in the reconstructed waveform, including peaks between samples. Measure both, then listen for uneven speakers, distortion and distracting noise. Passing two measurements does not guarantee that a recording sounds good or meets every requirement of a distributor.

A useful podcast reference

Apple recommends approximately −16 LKFS with a tolerance of ±1 dB and true peaks no higher than −1 dBFS. LUFS and LKFS use the same loudness scale. Our Podcast preset uses −16 LUFS and a −1 dBTP ceiling.

Spotify's −14 LUFS documentation describes music normalization and includes exceptions for players and listening settings. It is not a universal podcast submission requirement. Do not assume that every platform will raise a quiet episode or turn down a loud one in the same way.

Need to change what you measured?

Explore podcast mastering for a finished spoken-word file, or podcast audio cleanup if noise and room sound are the first problem to solve.

Use the result as a level check

Browser measurements help you compare files with the selected target. Audiobook catalogue and broadcast presets are reference settings; confirm the specification supplied by your distributor. An ACX submission needs an RMS check and other checks this tool does not provide.

PodMaster cleans and masters spoken-word recordings. Listen to the delivered file and check its measurements against your destination before publication.

For the full walkthrough of targets and how to hit them in your own chain, read our guide: How loud should a podcast be?

FAQ

What LUFS should my podcast be?
For a stereo podcast, −16 LUFS integrated with true peaks no higher than −1 dBTP is a useful reference aligned with Apple's recommendation. Check your destination's delivery requirements; playback behaviour varies by platform and settings.
Is −14 LUFS too loud for a podcast?
−14 LUFS is louder than Apple's recommended −16 ±1 range. It is not automatically distorted or unsuitable for every destination. Choose the delivery target first and avoid unnecessary compression just to reach a number.
What is true peak and why does it matter?
True peak measures the reconstructed analog waveform, including peaks that occur between samples. Episodes that exceed −1 dBTP risk audible clipping after the lossy encoding platforms apply.
Does this tool upload my audio?
No. Analysis runs entirely in your browser. Your file never leaves your machine.