UD5 Toolkit
Image FFT Visualizer - Online See Frequency Domain
Upload an image and see its 2D FFT magnitude and phase. Learn how image filtering works. Educatinal tool. Canvas.
Audio Visualizer Bars - Online Live FFT Spectrum
Ready. Select source and start.
Frequently Asked Questions
This tool captures live audio from your microphone or an audio file and displays a real‑time FFT spectrum as animated bars. Each bar represents a frequency band, moving with the music intensity – perfect for understanding audio frequencies, making videos, or just having fun.
FFT (Fast Fourier Transform) converts the audio signal from the time domain into frequency domain. The AnalyserNode in Web Audio API splits the sound into many frequency bins, and we draw these as vertical bars – low frequencies on the left, high on the right.
Absolutely! This online spectrum visualizer runs entirely in your browser. No registration, no upload to any server – your privacy is protected.
Select “Microphone” source and click Start. Your browser will ask for microphone permission – allow it. The bars will instantly begin reacting to sounds around you or your voice.
We support formats your browser can decode natively, typically MP3, WAV, OGG, FLAC, AAC, and WebM. Upload a file and the visualizer will play it back while drawing the spectrum.
Make sure your microphone is connected and permission is granted. Also check that the input volume is not muted in your system settings. If you’re on a secure (HTTPS) site, browser policies allow microphone access; otherwise switch to a secure connection.
FFT size determines how many frequency bars are displayed and the frequency resolution. A larger value (e.g., 512) shows more detail in the high frequencies but may respond a bit slower. Smaller values (32–64) give a smoother, averaged look.
Yes. All processing happens locally in your browser using the Web Audio API. No audio data is ever recorded, stored, or sent to any server. Your microphone stream stays on your device.
Yes, the tool is fully responsive. On iOS Safari or Android Chrome, you can grant microphone permission directly. The canvas adjusts to your screen size for a great mobile experience.
Bars on the left represent bass (low frequencies, ~20–250 Hz), middle bars are midrange (vocals, guitars) and rightmost bars represent treble (hi‑hats, cymbals). The height shows the energy in that band – higher bar = louder sound at that frequency.
Live Audio Spectrum Analyzer – Online Microphone FFT
Real‑time frequency spectrum from your microphone. Visual bars or line. Check room resonance.
Audio Waveform Visualizer - Online See Your Sound
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Live Website Color Blindness Simulator – Enter URL
Enter any live URL and view it through eight different color vision deficiency filters. Identify contrast issues and improve your site’s accessibility.
QR Code Scanner from Camera - Online Live Decode in Browser
Scan QR codes using your device camera. Decodes text, URLs, and Wi‑Fi credentials directly in the browser. No data sent to server.
Media Query Live Tester - Online Resize & See Results
Write a media query and see if it matches as you resize the iframe. Understand width, height, and resolution queries.
Scroll Position Monitor - Online Live Scroll Top/Left
See a live readout of window scrollX and scrollY. Visualize scroll direction. For debugging sticky navs.
Webcam Color Detector - Online Live Hue Picker
Point your camera at an object and see the dominant color in real time. Click to copy the hex. Fun tool for designers.
Electromagnetic Spectrum Explorer - Online Wavelengths
Zoom through the electromagnetic spectrum from radio waves to gamma rays. See wavelength, frequency, and applications. Static educational page.
Live Binary Clock - Online Hex & Decimal Time
See the current time displayed in binary and hexadecimal. Dark theme, full‑screen mode. A geeky desk decoration.
Speech Live Counter - Online Count Spoken Words
Speak into the mic and see a live transcript with word count. Uses the Web Speech API. Nothing is stored.
ISS Tracker - Online Live Where is Space Station
See the International Space Station’s current position on a world map in real time. Uses public API. No refresh.
WAV Oscilloscope - Online Visualize Audio Waveform & Spectrum
Load a WAV file and see its real-time oscilloscope trace and frequency spectrum. Zoom and pan. Pure frontend.
Scan Barcode from Camera - Online Live UPC/EAN Reader
Point your camera at a barcode and decode it live. Works with multiple formats. Pure JavaScript barcode detection.
Recent Earthquake Tracker - Online USGS Live Data Map
View recent earthquakes worldwide on a map. Fetches public USGS GeoJSON feed directly from browser. Real-time data.