Free Audio Tools. No uploads.
Convert, merge, and normalize audio entirely in your browser. Your files never leave your device.
Convert between any common audio format, merge multiple tracks into one file, or normalize volume across a batch — all powered by FFmpeg running locally. No subscriptions, no file-size paywalls, no account required.
Convert Audio
MP3, WAV, OGG, M4A, FLAC, AAC
Merge Audio
Join multiple tracks into one file
Normalize Volume
Even out loudness (EBU R128)
Change Speed
Speed up or slow down without pitch change
Shift Pitch
Transpose pitch in semitones, constant speed
Adjust Volume
Boost or reduce volume by dB amount
Fade In / Fade Out
Add fade in and fade out to audio clips
Reverse Audio
Play audio backwards for effects
Remove Silence
Trim leading and trailing silence automatically
Voice Recorder
Record from mic, pause, download WebM or MP3
Transcribe Audio
Speech to text with Whisper — text, SRT, VTT, PDF notes
Looking for trimming or compression? See the video & audio tools.
Frequently asked questions
Are these audio tools free?
Yes, completely free with no signup, no account, and no limits. All tools are open source and will stay free.
Do my audio files get uploaded to a server?
No. All conversion, merging, and normalization runs in your browser via FFmpeg compiled to WebAssembly. Your audio files never leave your device.
Why does it take a moment to start the first time?
The FFmpeg WebAssembly engine (~25 MB) downloads once on first use and is then cached by your browser. Subsequent visits and operations start immediately.
Is there a file size limit?
No enforced limit. Processing is in-browser, so practical limits depend on your device memory. Audio files are typically much smaller than video, so most tracks work without issue.
Which audio formats are supported?
Input: MP3, WAV, OGG, M4A, FLAC, AAC, AIFF, OPUS, and most other common formats. Output varies by tool — see each tool page for supported output formats.