Mixing and mastering
Spot mud building up around 200 to 400 Hz, harshness at 2 to 5 kHz, or a sub-bass that will vanish on phone speakers. Check the loudness in the waveform analyzer.
Free Audio Spectrum Analyzer Online for Songs and Live Mic
EzVisualizer is a free spectrum analyzer that shows how loud every frequency is, from 20 Hz bass to 20 kHz treble, while a song plays or your microphone listens. Choose an FFT size up to 32768, switch to 1/3-octave bars, hold the peaks and hover any point to read its frequency, level and note. Everything runs in your browser.
- Free, no sign-up
- Live microphone input
- FFT 1024 to 32768
- Nothing uploaded
What a Spectrum Analyzer Shows
A waveform shows level over time. A spectrum analyzer shows level across frequency: bass on the left, treble on the right, loudness going up. Every note and every instrument adds peaks to the frequency spectrum, and the picture moves as the music plays. The horizontal axis is logarithmic, 20 Hz to 20 kHz, so each octave gets the same width, the way your ears hear it. The vertical axis is in decibels relative to full scale. Point at a peak and the analyzer tells you its frequency, its level and the nearest note.
Open the Spectrum AnalyzerFFT Size and Frequency Resolution
A spectrum analyzer splits the sound into frequency bins with an FFT. A bigger FFT makes narrower bins, so close notes separate, but each frame covers a longer stretch of audio, so the display reacts more slowly. At a 48 kHz sample rate:
- 1024: bins 46.9 Hz wide, 21 ms of audio per frame. Fast and smooth, blurry in the bass.
- 4096: 11.7 Hz bins, 85 ms. A good default for music.
- 16384: 2.9 Hz bins, 341 ms. Low notes a semitone apart come out as separate peaks.
- 32768: 1.5 Hz bins, 683 ms. For steady tones and hum, too slow for drums.
- The window matters too: Hann suits most music, Blackman-Harris keeps a loud peak from hiding a quiet tone next to it, flat top reads the level of a steady tone most accurately.
Why Use This Online Audio Spectrum Analyzer
The controls of a studio analyzer plugin in a browser tab, with the waveform, spectrogram and oscilloscope of the same sound one click away.
Live from your microphone
Watch a room, a voice or an instrument as it happens, or the sound of another browser tab. Or open a file and see the audio spectrum move with playback.
You choose the resolution
FFT sizes from 1024 to 32768, Hann, Blackman-Harris or flat-top windows, and fast or slow averaging for a steadier picture.
Line or 1/3-octave bars
A detailed FFT line for precise work, or 31 bars in standard 1/3-octave bands: the classic eq visualizer look.
Frequencies and note names
Hover anywhere for the frequency in Hz, the level in dB and the nearest note, so 110 Hz reads as A2.
Four views of one sound
The same audio opens as a waveform, a spectrogram and an oscilloscope. No second tool, no second upload.
Free and private
No account, nothing uploaded: the FFT runs in your browser tab. Export a PNG or a CSV of the frequency spectrum when you need one.
How to See the Frequency Spectrum of a Song
Three steps with the tool above. It works the same with a song file or a live microphone.
Drop an MP3, WAV, FLAC, M4A or OGG file, press the microphone button for live input, or load the demo track.
Bass sits on the left, treble on the right. Turn on peak hold, pick a bigger FFT for detail, and hover a peak for its frequency and note.
Freeze the moment you want, then save it as a PNG image or a CSV of frequency and level for a spreadsheet.
Step 1 · Open a song or your mic
Audio Spectrum Analyzer Features
What the audio spectrum analyzer draws, and the controls that make the reading useful.
A live spectrum from your microphone
Allow microphone access and the audio spectrum moves with every sound in the room: a voice, a guitar, a hum from the fridge. It makes a quick sound spectrum analyzer online for checking feedback, tuning a drum or showing a class what a whistle looks like. Phone and laptop mics are not calibrated, so levels read in dB relative to full scale, not sound pressure.
Use My Microphone1/3-octave bars: the eq visualizer view
Switch from the FFT line to 31 bars on the standard 1/3-octave centers, 20 Hz to 20 kHz, the eq spectrum view you know from hardware graphic equalizers. Turn on A-weighting to tilt the display toward how loud each band sounds to people, with the deep bass and the very top turned down.
Switch to BarsFrequency, level and note under the cursor
Move the pointer across the frequency spectrum and the readout follows: frequency in Hz, level in dB and the nearest note name with its cents offset. Hover the tallest peak of a held note and you have a frequency analyzer for tuning, finding a ringing resonance or naming the hum in a recording.
Read a PeakPeak hold, averaging and freeze
Peak hold keeps the highest level each bin reached, falling slowly or held until you reset it, so you see the loudest moments of a whole chorus. Averaging smooths the frame-to-frame jitter. Freeze stops the display while the audio keeps playing, so you can read or export one moment. Or switch the source to Average for one curve of a selection or the whole song.
Hold the PeaksReading the Audio Spectrum of a Mix
A frozen frame from a pop chorus with peak hold on, and what each region of the frequency spectrum tells you.
What you are looking at
The kick’s fundamental peaks near 55 Hz, with the bass guitar just above it. The vocal’s presence sits around 2 to 4 kHz, and the bump near 7 kHz is sibilance. Above 16 kHz the spectrum drops off a cliff: a sign the file was a lower bitrate MP3, which cuts the very top. To see how those bands change through the song, open the same file in the online spectrogram.
Spectrum Analyzer Specs
What this spectrum analyzer online measures and how. Specs checked November 2026.
| This siteEzVisualizer spectrum analyzer | |
|---|---|
| Input | An audio file, your microphone or another browser tab (live; tab audio in desktop Chrome or Edge), or a demo signal |
| Files | MP3, WAV, FLAC, M4A/AAC, OGG, or anything else your browser can decode; up to 400 MB and 20 minutes (10 on phones) |
| FFT size | 1024, 2048, 4096, 8192, 16384 or 32768 points |
| Window | Hann, Blackman-Harris or flat top |
| Axes | Log or linear frequency; level in dB relative to full scale, with a floor and ceiling you set |
| Display | FFT line or 31 bars on the IEC 1/3-octave centers, 20 Hz to 20 kHz; A or flat (Z) weighting; tilt in dB per octave |
| Tools | Peak hold (falling or infinite), fast or slow averaging, freeze, average of a selection or the whole file, Hz, dB and note readouts |
| Export | PNG up to 3840 × 2160; CSV of every FFT bin with peak hold, or of the 31 bands |
| Other views | Waveform, spectrogram and oscilloscope of the same audio |
| Privacy and price | Runs in your browser, nothing uploaded; free, no account |
Frequency Analyzer Online or a Plugin?
Compared by type of tool. Audacity’s Plot Spectrum is free; Voxengo SPAN is a free analyzer plugin; iZotope Insight is a paid metering suite.
| This siteEzVisualizer | Simple online analyzers | Desktop editor (Plot Spectrum) | Analyzer plugins | |
|---|---|---|---|---|
| Live microphone | Yes | Often mic only | Record first | Through your DAW |
| Audio files | Yes | Sometimes | Yes | Inside a DAW session |
| FFT size and window | 1024 to 32768, three windows | Usually fixed | Yes | Yes |
| 1/3-octave bars | Yes | Varies | No | Varies |
| Note names | Yes | Rarely | Yes | Varies |
| Waveform, spectrogram, scope | All three, one click | Rarely | Waveform and spectrogram | Separate plugins |
| Install | None | None | Required | Plugin plus a host |
What People Check With a Spectrum Analyzer
It answers one question: which frequencies are there, and how loud. Here is who asks it.
Live sound and rooms
Find the frequency that starts to ring before feedback takes off, or a room mode that booms. Treat the levels as relative: a phone mic is not a measurement mic.
Musicians
See the note and cents of a string or a pipe, compare how two instruments fill the frequency spectrum, then find the tempo with the BPM finder.
Hunting hum and noise
Mains hum shows up as a sharp peak at 50 or 60 Hz with harmonics above it. A big FFT and peak hold make it obvious.
Science and music lessons
Whistle, sing or play a note and watch its harmonics appear. A live music spectrum display makes overtones visible to a whole class.
Streamers and creators
Want the audio spectrum on screen while you stream or play? The live audio visualizer turns your mic or a tab into moving visuals.
Spectrum Analyzer FAQ
FFT sizes, microphones, accuracy and what to use when.
How do I see the frequency spectrum of a song?
Drop the song on the spectrum analyzer at the top of this page and press play. Bass shows on the left, treble on the right, and the height of each point is its level. Turn on peak hold to keep the loudest moments, freeze the display to read one frame, or switch the source to Average to see the whole song as one curve.
Is this spectrum analyzer online free?
Yes, with no account and no limits. Whether you search for a spectrum analyzer online or a spectrum analyser online, this is the same free tool, and the PNG and CSV exports are free too.
Can I use my microphone as a sound analyzer online?
Yes. Allow microphone access and the sound frequency analyzer online shows the live spectrum of everything the mic hears. Built-in mics often filter the deep bass and are not calibrated, so read levels as relative, not as dB SPL.
What FFT size should I use?
4096 is a good start for music. Go up to 16384 or 32768 to separate low notes or a hum, down to 1024 or 2048 when you want the display to react fast to drums. Bin width is the sample rate divided by the size: about 11.7 Hz for 4096 at 48 kHz.
Hann, Blackman-Harris or flat top?
Hann for everyday music. Blackman-Harris spreads a loud peak less into its neighbors, so a quiet tone near a loud one stays visible, at the cost of slightly wider peaks. Flat top has the widest peaks but reads the level of a steady test tone most accurately.
What does A-weighting do?
It turns the display down at the low and very high end, roughly the way hearing is less sensitive there at moderate levels. Use it to see what people will notice; leave it off to see what is really in the file.
How accurate is this frequency analyzer?
Frequency readings are as fine as the bin width of the FFT size you choose, and note names assume A4 = 440 Hz. Levels are relative to digital full scale. It is a precise everyday tool, not a calibrated laboratory instrument.
Can it work as a frequency meter online?
For a single steady tone, yes: a readout names the strongest peak with its frequency and note, and the cursor reads any other point. As a sound frequency meter online it reads the strongest peaks, not a single number for a full mix, which always has many frequencies at once.
What is the difference between a spectrum analyzer and a spectrogram?
A spectrum analyzer shows one moment: frequency across, level up. A spectrogram stacks those moments over time, with level as color. The online spectrogram uses the same FFT settings, and the waveform analyzer shows level over time.
What is an EQ visualizer?
A display of the audio spectrum as bars, like the lights on a hardware graphic equalizer. The 1/3-octave view is that visual equaliser: 31 bands from 20 Hz to 20 kHz. It shows the balance, but it does not change the sound.
Is this a spectrum editor?
No. It reads the spectrum and leaves the audio as it is. A spectrum editor, found in some desktop repair tools, lets you paint out noises on a spectrogram. Use the analysis here to find a problem, then fix it in your editor.
Can I turn the spectrum into a music video?
Not on this page, which is for measuring. For an audio spectrum visualizer video, the audio visualizer spectrum styles render a moving spectrum over your cover art as an MP4. It works as an audio spectrum generator, a music spectrum visualizer and a frequency visualizer in one.
Why does my song’s spectrum stop around 16 kHz?
Lossy encoders save space by cutting the highest frequencies, and lower bitrate MP3s often cut around 16 kHz. A WAV or FLAC of the same master usually goes higher. It is a quick way to spot a file that was once a low bitrate MP3.
Is my audio uploaded?
No. Files and microphone audio are analyzed inside your browser tab and never leave your device, so this online audio spectrum analyzer is safe for unreleased work.
More Audio Analysis Tools
From Spectrum Visualizer to Finished Video
See a sound spectrum visualizer move with your track, or turn it into a video.
- Sound Wave GeneratorSound wave videos and images from any audio file.
- Audiogram GeneratorWaveform clips for podcast episodes and interviews.
- YouTube Visualizer16:9 visualizers for singles, albums and long mixes.
- MP3 to MP4 ConverterYour MP3 and cover art as an MP4 that video sites accept.
- TikTok VisualizerVertical 9:16 clips built around your hook.
- MP3 Tag EditorEdit title, artist, album and cover tags in your browser.
Open the Spectrum Analyzer
Drop a song or turn on your microphone: the spectrum analyzer shows every frequency from 20 Hz to 20 kHz, live, with peak hold, 1/3-octave bars and note names. Free, private and in your browser.