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This podcast loudness checker analyzes an audio file directly in your browser and gives you a practical view of overall loudness, loudness variation and peak level before you publish or continue processing your episode.
Analyze the included sample or choose your own audio file. The browser decodes and measures the audio locally.
Select a podcast, narration, voice recording or other audio file from your device.
You can run the checker immediately without choosing another file.
A podcast can sound comfortable during editing and still behave differently when compared with other spoken programs. Looking at loudness provides another reference beyond simply watching waveform height or listening at one monitor setting.
The checker decodes the selected audio in your browser and examines the signal across the complete file. It reports an estimate of integrated loudness together with loudness variation, sample peak and crest factor so you can inspect several useful characteristics in one place.
Use the included sample or select a podcast or voice file from your device.
The browser converts the selected file into audio samples for measurement.
The signal is evaluated for loudness, variation, sample peak and RMS behavior.
Read the measurements together rather than relying on a single number.
For more hands-on audio experimentation, try the Interactive Online Audio Mixer or explore Audio Tools for Recording, Mixing, and Ear Training.
Integrated loudness summarizes the measured program over time rather than reporting only an instantaneous level. This makes it more useful for evaluating an entire podcast segment than a simple peak meter alone.
Loudness range describes how much the measured loudness changes across the analyzed material. Spoken recordings with pauses, different speakers, music beds or changing delivery can show more variation than tightly controlled narration.
Sample peak reports the largest decoded sample magnitude. It is useful for spotting how close the signal gets to digital full scale, but it should not be confused with overall perceived loudness or true-peak measurement.
Crest factor compares the peak level with RMS level. It provides a compact indication of the relationship between transient peaks and the broader signal energy.
If you want to understand the broader production process, the Mixing and Mastering page covers how recorded material can be shaped after tracking.
A loudness reading gives you a repeatable measurement that is independent of where your monitor volume happens to be set. That is useful when comparing episodes, checking different edits of the same program or reviewing material recorded on different days.
Analyze episodes or segments individually to see whether their overall measured levels differ substantially.
Programs containing speech, intros, music and other elements can vary significantly across their duration.
Run the checker again after making level, compression or limiting changes and compare the measurements.
If you work with spoken content, the Audio Content Recording Services overview covers several types of voice-based projects. You can also read about commercial audio and presentation recording when preparing shorter spoken productions.
The tool is designed for a simple workflow: choose a file, analyze it and read the measurements without building a full editing session just to inspect basic level behavior.
When you select your own audio, the File API provides the file to JavaScript and the Web Audio API decodes it in the browser. The analysis then works from the decoded samples.
The included audio sample is loaded by default, so the checker can be tested immediately. Selecting another file replaces that sample for the current analysis.
For another interactive way to understand signal flow, open the Mixer Console Simulator. Creators preparing vocal material may also find the guide to vocal recording time useful when planning sessions.
Although the interface is centered on podcast material, the same measurements can be useful when inspecting narration, educational audio, spoken introductions, interview edits and other creator-focused audio files.
The most useful approach is to consider the measurements together. Integrated loudness describes the overall program, loudness range shows variation, peak level identifies the largest decoded sample, and crest factor provides another view of the signal's dynamics.
Creators working with vocal material can explore voice, vocal and speech recording. For multilingual spoken projects, there is also information about Russian voice-over for U.S. media projects.
When comparing podcast files, measure complete versions whenever possible. Comparing a full episode with a short excerpt can produce results that describe different portions of the program rather than the difference you intended to investigate.
It is also useful to keep the workflow consistent. If you analyze one version before final processing and another after limiting, the difference may reflect that processing. That can be useful when it is exactly what you want to compare.
Two files can produce similar overall measurements while still sounding different because of tonal balance, background noise, editing, speaker delivery or the relationship between speech and music.
Use the numbers as additional information and listen to the actual program as part of the review. If you're new to recording, the First Time Recording Studio Guide explains several practical parts of the recording process.
For artists traveling with a project, the focused recording-day guide offers additional preparation ideas.
The browser processes the decoded audio channels and applies frequency weighting before calculating the integrated loudness estimate. Very low-level blocks are excluded from the main loudness calculation, followed by an additional relative gating step based on the measured program.
Loudness variation is estimated from shorter measured blocks across the program. The tool calculates a percentile-based range after excluding very quiet sections, providing a useful indication of how much the active program changes over time.
Sample peak is calculated separately by finding the largest absolute decoded sample. RMS is also calculated across the audio and is used with the sample peak to derive the displayed crest factor.
For song-focused projects, visit Song Demo Production. If you're exploring how different styles are approached, see Blues and Country Recording. Artists coming from outside the area can also read the vocal recording guide for New York singers.
Yes. Choose a compatible audio file from your device and run the analysis. Your selection replaces the included sample.
It is a program-level loudness measurement that summarizes audio over time rather than reporting only the largest peak.
No. Sample peak examines decoded digital sample values. True-peak measurement also considers possible peaks between samples.
Yes. Analyze the first file, copy or note its results, then select the second file and run the checker again.
The checker analyzes the selected file in the browser. No server-side file processing is required by this tool.
Load a file, inspect its overall loudness and dynamics, then use the measurements alongside careful listening when reviewing your finished audio.
Go beyond individual audio tools. Arrange multiple tracks, edit clips, build modular effect chains, add modulation, mix through a Master bus, save projects and export the finished mix to WAV.
Explore 168 free browser-based tools for musicians, singers, producers, engineers and creators. Open a category to find your next tool.
I build Ronter Sound Lab and the audio tools on this website as free resources for musicians, producers and creators. If these tools are useful to you and you would like to support the project, any voluntary contribution helps me continue developing the free online DAW, create new tools, improve existing features and keep everything available to everyone.
Every contribution, large or small, is sincerely appreciated. Thank you for supporting independent development.