Working with audio
Audio tools
Record, convert, trim and normalize audio directly on your device.
Audio tools record, trim, merge, change speed or pitch, remove silence, or turn a video into an audio file. Each one does that single job with Web Audio in the browser.
A typical job is a voice note with a long pause, or a lecture you want faster. Open the matching tool instead of a full audio editor.
The browser decodes the file into memory, so a long high-bitrate recording can fail even when a short one works. Playback uses your device's sample rate; this is not a studio master.
Audio tools in this category
15 tools
Audio Analyzer
Measure sample peak, an interpolated true peak, RMS, a simple LUFS figure, and stereo correlation for an audio file.
Use this tool when Do you want to check the peak amplitude and loudness level of an audio file?
- Peak, RMS, and an RMS-offset LUFS figure in dBFS
- Stereo correlation from −1 to 1 and a pan weight
- Log spectrogram of the first 60 seconds
MP3 to WAV / WAV to MP3
Local audio conversion between MP3 and WAV directly in the browser without downloading to the server.
Use this tool when Do you need to quickly reformat an interview recording for editing?
- Local audio decoding and processing
- Immediate preview before download
- Clear export flow for the final result
Merge Audio
Decode two or more audio files, place them one after another, and download a 16-bit WAV.
Use this tool when Do you need to glue voice notes into one large audio file?
- Channel count is the maximum across the files, not the first file's count
- A missing channel is a copy of that file's last channel
- Duration of the result is the sum of the resampled lengths
Audio Normalizer
Equalize the volume level of audio files to the optimal standard without losing quality.
Use this tool when Do you need to prepare a voice recording from a meeting for comfortable listening?
- Local audio decoding and processing
- Immediate preview before download
- Clear export flow for the final result
Audio Scale Converter
Convert one level between dBFS, percent, and linear amplitude, and print all three.
Use this tool when Do you need to convert audio amplitude values to decibels (dB)?
- Source and destination menus: dBFS, percent, linear amplitude
- dBFS to two decimals, linear to six, percent to three
- A non-finite input becomes amplitude 0
Audio File Spectrogram
Draw a Hann-windowed spectrogram of an audio file, with a start and end time and a choice of FFT size.
Use this tool when Do you want to visualize the frequency spectrum of a sound file over time?
- FFT analysis
- Frequency and level grid
- Peak frequency search
Audio Speed and Pitch
Flexibly change playback speed and audio pitch locally in the browser.
Use this tool when Need to quickly listen to a long webinar recording at 1.5x or 2.0x speed?
- Local audio decoding and processing
- Immediate preview before download
- Clear export flow for the final result
Trim Audio
Cut a start and end time from an audio file and download that slice as 16-bit WAV.
Use this tool when Do you need to make a beautiful ringtone for your phone from your favorite song?
- Local decode and a waveform with start and end handles
- Start and end fields in seconds, with a 0.01 second minimum gap
- 16-bit PCM WAV download named from the source file
Realtime Spectrum Analyzer
Watch a live Hann-windowed FFT of the microphone, from 512 to 8192 points, on a linear or log frequency axis.
Use this tool when Do you want to visualize microphone audio frequencies in real-time?
- Live microphone FFT
- Linear or logarithmic frequency axis
- Optional peak frequency readout
Remove Silence from Audio
Automatically find and cut silence and long pauses from your audio recordings.
Use this tool when Need to shorten the length of a lecture or podcast by removing long pauses?
- Local audio decoding and processing
- Immediate preview before download
- Clear export flow for the final result
Text to Speech
Speak your written text using natural browser voices and save the audio.
Use this tool when Do you want to listen to long texts or books instead of reading from a screen?
- Voice selector populated from the browser.
- Rate and pitch controls for playback.
- Stop button for long passages.
Tone Generator
Render a sine, square, sawtooth, or triangle tone from 20 Hz to 20 kHz and download it as WAV.
Use this tool when Do you need to test headphones or speakers for sound distortion?
- Sine, square, sawtooth, and triangle at 44.1 kHz mono
- Frequency clamped from 20 Hz to 20000 Hz
- WAV download of a 0.1 to 60 second render
Video to MP3 Converter — Extract Audio from Video
Extract the audio track from MP4 or WebM video and save it as MP3 or WAV — entirely in your browser, no upload.
Use this tool when Extract the soundtrack from a recorded webinar or lecture to listen to it like a podcast.
- Pulls the audio track out of the container with the Web Audio API.
- MP3 export via the browser's native encoder, with automatic WAV fallback.
- Built-in player to preview the extracted audio before downloading.
Voice Recorder
Record the microphone with MediaRecorder, play the take back, and download WebM or the type your browser supports.
Use this tool when Need to quickly dictate an idea or note while it's fresh in your head?
- MediaRecorder from the microphone
- Elapsed time updated every 250 milliseconds
- Download as WebM, or M4A when the browser records MP4
Audio Waveform Visualizer
Decode an audio file and draw the first channel as a min/max waveform, with duration, channel count, and sample peak.
Use this tool when Do you need to quickly find moments of silence or noise in an audio recording?
- Canvas of 960 by 260 CSS pixels of sample data
- Min and max of channel 1 in each column
- Peak taken across every channel
More tools
The rest of the catalogue. Each tool still runs in your browser.
