Audio Converter
Convert between common audio formats with bitrate and channel controls.
Audio Tools
Convert, trim, join and edit recordings in your browser. Find a musical tempo, practice with a metronome or transcribe speech on a compatible WebGPU device. Selected audio stays on your device.
All Audio Tools
MP4 to MP3
Extract an MP3 soundtrack from a local MP4 video.
WAV to MP3
Make a smaller, shareable MP3 copy of a WAV recording.
M4A to MP3
Convert an unencrypted M4A recording to a shareable MP3 file.
OGG to MP3
Turn supported OGG audio into MP3 with adjustable encoding settings.
FLAC to MP3
Create an MP3 listening copy while keeping your original FLAC.
MP3 to WAV
Decode an MP3 recording to 16-bit PCM WAV for editing workflows.
M4A to WAV
Decode supported M4A audio into 16-bit PCM WAV.
Audio Fade In/Out
Add independently timed fades to the start and end of an audio file.
Audio Metadata Editor
Read and edit common audio tags without re-encoding the audio stream.
MP3 Compressor
Reduce MP3 bitrate and compare the output size before downloading.
MP3 Cutter
Trim MP3 audio with waveform positioning and exact time fields.
Audio Joiner
Merge supported recordings in order with common output encoding settings.
Reverse Audio
Reverse the audio samples and download a backwards recording.
BPM & Key Finder
Estimate musical tempo and key with separate confidence scores.
BPM Counter
Measure a tempo by tapping a button in time with the beat.
Online Metronome
Play a scheduled beat with adjustable tempo, bar length and volume.
Playlist Name Generator
Generate and copy playlist names from curated mood and theme word banks.
Audio Transcription
Transcribe speech locally with editable text and TXT, SRT or VTT export.
Convert audio for the format you need
Audio Converter handles MP3, WAV, M4A, OGG and FLAC output. Set bitrate for MP3 or AAC, choose the sample rate and keep stereo or downmix to mono. Format-specific pages take you straight to WAV to MP3, M4A to MP3, OGG to MP3, FLAC to MP3, MP3 to WAV or M4A to WAV.
To save the soundtrack from a local video, use MP4 to MP3. It reads the first audio stream and leaves out the picture. Encrypted or unsupported streams cannot be converted.
Trim, combine and shape a recording
MP3 Cutter keeps a selected time range, and Audio Joiner puts recordings together in the order you choose. The joiner matches their sample rate and channel count before creating one file.
Use Audio Fade In/Out to soften the beginning or ending, or Reverse Audio for backwards playback. MP3 Compressor reduces bitrate and compares the result’s size with the source. Audio Metadata Editor changes text tags while copying the audio stream without re-encoding.
Music tempo, key and practice tools
BPM & Key Finder estimates tempo and major or minor key from a recording and reports separate confidence scores. These are algorithmic estimates; half-time rhythms, changing tempo and key modulation need a listening check.
BPM Counter measures your taps without reading a file. Online Metronome plays a chosen pulse with an accented first beat. Playlist Name Generator combines mood and theme words into names you can copy.
Turn speech into editable text
Audio Transcription runs multilingual Whisper Tiny locally on a compatible WebGPU device. Review the main transcript for TXT export and the timed segments for SRT or VTT. The model downloads on first use, but your recording and transcript are not uploaded.
Recordings can be accepted up to 15 minutes, subject to file settings and device memory. This limit does not guarantee processing speed or support on every phone. Try a short sample and review recognition errors before using the result.
Privacy, file support and audio quality
Selected files stay in your browser. The processing engine loads from this site when needed; transcription also downloads model weights from Hugging Face. Audio processing can use substantial memory and battery even without an upload.
Check the displayed file and duration limits before starting. An allowed extension is only the first check: file headers, readable duration and codec support also matter. A renamed executable is not an audio recording.
MP3, AAC and Vorbis export are lossy. WAV stores 16-bit PCM and FLAC compresses the decoded signal losslessly. Converting a lossy source into WAV or FLAC cannot recover discarded detail. Keep original recordings until the downloaded copies are checked.
Frequently asked questions
Are audio files uploaded to a server?
No. These tools process selected files locally in your browser. Speech recognition downloads model weights, but the audio and transcript remain on your device.
Is there a daily limit on using the audio tools?
There is no account or daily usage quota. Per-file, combined-duration and decoded-memory limits keep a processing job within browser resources.
Which audio formats can I use?
The file tools accept the extensions shown beside their input. Most support MP3, WAV, M4A, OGG and FLAC. MP4 to MP3 and transcription can also read supported MP4 audio. Codec availability varies by browser.
Does every audio tool work on every phone?
No. Memory and codec support vary. Local transcription also requires WebGPU. Unsupported devices receive an explanation instead of a hidden server upload.