Online LUFS meter: loudness and true peak of your audio
Measure the integrated loudness (LUFS), true peak (dBTP) and loudness range (LRA) of your audio, and see how it will play on each platform.
Drag your audio files here or click to choose them
- .mp3
- .wav
- .flac
- .ogg
- .m4a
- .aac
Use your Google Drive without giving up your privacy
Pick files from your Drive, process them here and save the result to any folder you like. Everything happens in your browser: ShiftAny has no servers of its own.
- Your Google Drive
- Your browserAll processing happens here
- Your Drive or your device
- Your files travel straight between Google and your browser. They never touch a server of ours, because we don’t have any.
- Processing runs on your device, exactly as it does with a file from your computer.
- The app can only access the files you pick and the ones it saves to your Drive. Never the rest.
- Access expires after one hour and is never stored. This browser only remembers your name and email so you can reconnect in one click; you can disconnect at any time.
- Processing
- In your browser
- Upload
- No upload to ShiftAny
- Account
- No sign-up
- Price
- Free
- Input
- MP3, WAV, FLAC, OGG, M4A, AAC
- Platform
- Web browser
With the quality of SH Core, our own engine: what you hear is exactly what you download.
How to use “LUFS Meter”
- Add the audio files you want to measure.
- Wait a few seconds: each file is measured in full, according to ITU-R BS.1770-4 and EBU R128.
- Check the integrated LUFS, the true peak and the LRA, and the comparison with each platform.
- If it is off target, follow the “Normalize by loudness” link to bring it to −14, −16 or −23 LUFS.
What it measures and how precisely
Integrated loudness (LUFS) is the average perceived volume of the whole file, with the silence gates of the ITU-R BS.1770-4 standard: it is the figure platforms use to even out volume. True peak (dBTP) catches the inter-sample peaks that appear when converting or playing back; platforms ask you not to go above −1 dBTP. LRA (EBU Tech 3342) shows how much the loudness varies: little in heavily compressed music, a lot in classical music. The measurement is SH Core’s, ShiftAny’s own engine, validated against ffmpeg (EBU R128) on 17 real recordings: a maximum difference of 0.02 LU in integrated loudness. Each platform’s references come from its public guidelines and may change.
Are my files uploaded?
No. ShiftAny Audio processes your audio directly on your device: this tool runs in your browser and never sends your files to any server.
Limits and metadata
ShiftAny sets no duration or size limits: the real ceiling is your device’s memory, because the audio is decompressed to be processed and an hour of stereo takes more than 1 GB. With very long files, we warn you before loading them.
Frequently asked questions
What loudness do I need for Spotify or YouTube?
Both normalize to about −14 LUFS integrated, with the true peak below −1 dBTP. If your audio is louder, they will turn it down; if it is quieter, YouTube leaves it as it is and Spotify may raise it depending on the listener’s settings.
What is the difference between LUFS and peak dB?
Peak measures the highest sample; LUFS, the perceived volume of the whole file, with a filter that mimics the ear. Two files with the same peak can sound very differently loud.
What is a good LRA?
There is no single right value: it depends on the style. Pop and electronic music usually sit between 4 and 8 LU; a podcast, between 3 and 8; classical music can exceed 15. A very low LRA indicates heavy compression.
Does it measure 5.1 audio?
Yes: it applies the standard’s per-channel weights (the surrounds count more and the LFE does not count).
Does measuring change my file?
No: the meter only reads the audio and shows the report. If you want to correct the loudness, the report’s link takes you to “Normalize Audio”.