The original level, estimated
Web players turn tracks down. On sites whose playback processing is known, Recovery undoes the player's gain and shows an estimate of the original level, with info on how far the site turned it down.
Browser Extension
New in 2.0 · Recovery
Live LUFS, right in
your browser bar.
Get real-time integrated, momentary and short-term loudness, plus true peak and stereo correlation, on any audio playing in your browser. 100% free.
Works with
Chrome
Brave
Edge
Orion
mastering.to
Live
Integrated0:00
−11.4LUFS
+2.6 LU over
Original levelEstimate
−8.9LUFS
Beatport turned this down 2.5 dB.
Range5.2LU
PLR8.1dB
Correlation0.92
Live preview · simulated signal
In use
Docks beside whatever's playing.
Click the icon on a tab that's playing audio and the meter opens in Chrome's side panel. It keeps reading while you browse the page.
What's new in 2.0
A sharper meter, and a new trick.
Measured to the standard
Exact BS.1770-4 K-weighting summed per channel, the standard's 4× true-peak filter and EBU R128 gating. A −20 dBFS stereo tone reads −20.0 LUFS.
Loudness range and PLR
EBU Tech 3342 loudness range and peak-to-loudness ratio join integrated, short-term, momentary, true peak and correlation.
30 seconds of short-term
A rolling short-term trace with your target drawn across it, so you can see drops, builds and quiet intros at a glance.
A new measurement per track
When the next video or the next song in a set starts, integrated starts over. Turn it off to measure a whole session.
A new panel
Rebuilt in the mastering.to design, with white numbers, one signal blue and status shown as small marks.
Recovery
Hear past the player.
The meter hears the tab after the site's player has applied processing. Where processing is a simple change in volume, Recovery undoes it and estimates the track's original level.
- Read from the page. The player's volume, checked about once a second, and divided out of each block as it was measured.
- Always marked as an estimate, with brief info on how far the site turned the track down.
- No rule, no estimate. Compression and limiting can't be undone, and unknown sites show the level as played.
| Site | What Recovery knows |
|---|---|
| YouTube | Normalization lowers the player volume (loud uploads only, −14 LUFS target). The volume is read and compensated for. |
| YouTube Music | The same player, with a −7 LUFS target. |
| Beatport | The preview player plays at 75% volume (−2.5 dB), with no other processing. |
| Spotify web player | Doesn't normalize. Only the player volume is compensated for. |
| Bandcamp | Doesn't normalize. Only the player volume is compensated for. |
| SoundCloud | Only the player volume is compensated for; SoundCloud doesn't publish how it normalizes. |
| Apple Music, Tidal, Deezer | Their web players don't show the gain they apply, so there's no estimate. |
Checked in each player on October 28, 2026, or taken from the platform's published documentation.
Extension details
Version2.0.1
UpdatedOctober 28, 2026
Size114 KiB
LanguageEnglish (US)
New in 2.0
- Recovery: an estimate of a track's original level on sites whose playback processing is known.
- Exact BS.1770-4 K-weighting and true peak, checked against EBU test signals.
- Loudness range, PLR and a 30-second short-term history.
- A new panel in the mastering.to design.
- Starts a new measurement when the track changes, and follows the tab you're metering.
- Source information now updates between sites and on Beatport.
What it does
Meter any tab, instantly
Capture audio from whatever's playing in your browser, like a SoundCloud private link, a Bandcamp release, or a client's WeTransfer preview, and read true LUFS without leaving the page.
Integrated, momentary & short-term
Full ITU-R BS.1770 / EBU R128 loudness suite. Watch integrated settle while momentary and short-term track the moment-to-moment energy of the mix.
Platform targets built in
Switch between Spotify, YouTube, Amazon Music, Apple Music, Tidal, Deezer, club, and broadcast targets. See your over/under in LU at a glance, the same logic the full analyzer uses.
True peak & stereo correlation
Catch inter-sample peaks before they clip on lossy codecs, and keep an eye on phase correlation so your low end stays mono-safe.
Loudness range & short-term history
Loudness range and PLR show how dynamic the master is, and a rolling 30-second short-term trace shows how loudness moves over time.
Private by design
Metering happens entirely on your machine. Nothing is uploaded, recorded, or sent anywhere; the same browser-only philosophy as the rest of mastering.to.
Frequently Asked Questions
It's nothing sketchy! That warning is Chrome’s standard wording for the one thing the extension actually needs: capturing the audio playing in your current tab so it can measure the loudness. To read the sound coming out of a page, Chrome lumps that under the same broad “read and change data” permission bucket. There’s no narrower option it can show you. The extension only ever activates on the tab you point it at, only when you click it, and it reads the audio signal, but nothing else on the page. The one exception is Recovery, which is off until you turn it on: it reads the player’s volume setting (and, on YouTube, the loudness figures YouTube publishes for the video). It does not read your messages, your passwords, your browsing history, or the content of any site. It listens to sound, measures it, and shows you the numbers.
No. None. Nada. Zilch. The extension does not collect, transmit, or sell any data whatsoever: not your audio, not the websites you visit, not analytics, not an email address, nothing. Everything happens locally on your own machine, in real time, and disappears the moment you stop metering. The only thing it remembers is your settings, on your own machine. There are no accounts, no tracking, and no servers receiving anything from you. It is a free measurement tool, period, with no strings attached.
Many web players don’t play a track at its full level. Beatport’s preview player runs at 75% volume, and YouTube turns loud uploads down. The extension hears the tab after that, so the reading is the level as played. With Recovery on, on sites where that processing is known and is a plain change in volume, the extension reads the player’s volume from the page, undoes it, and shows an estimate of the track’s original level, with info on how far the site turned it down. Compression and limiting can’t be undone, so there’s no estimate while YouTube compresses audio, and none on sites without a known rule.
Usually the player’s volume. A player at 75% plays the track 2.5 dB down, and streaming sites that normalize turn loud tracks down to their target. The meter shows what the tab actually plays. Turn on Recovery to see an estimate of the original level on sites where the processing is known.
It’s genuinely free, and there’s no catch. We build loudness tools for a living at mastering.to, and the extension is a small, useful tool that we’re happy to give away. If you ever want deeper analysis, like spectrum, dynamics, stereo field, and platform-by-platform comparisons, that's available in our tool suite. But the extension is totally free with zero strings attached.
Integrated, momentary, and short-term LUFS (ITU-R BS.1770-4 / EBU R128), true peak in dBTP, loudness range, PLR, and stereo correlation, read live from whatever audio is playing in the tab. It’s the same metering methodology used in professional mastering tools, running right in your browser.
No. It only listens. The extension taps the audio stream to measure it and never alters, processes, or interrupts playback. What you hear is exactly what the page is putting out.
Meter your next listen.
Free on the Chrome Web Store. Works in Chrome, Brave, Edge, and Orion.
Add to Chrome
FREE
Need the full picture?
The extension is the quick read. For spectrum, dynamics, stereo field, and platform-by-platform analysis, open a track in the full mastering.to suite.