Audio tools
Extract and convert audio - locally in the browser with ffmpeg, no upload.
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The audio tools convert sound formats like MP3, WAV, M4A, AAC, OGG or FLAC into one another and pull the audio track out of a video. Under the hood ffmpeg runs as WebAssembly right in your browser, the same engine as on the desktop, just without an install.
Even large audio files stay on your device: nothing is sent to a foreign server, and the conversion runs without an account and without a queue. ffmpeg is self-hosted and runs fully offline in the browser, with no third-party CDN involved.
Convert
MP4 to MP3
Extract the audio track from MP4 to MP3 locally. The video never leaves your device.
Audio converter
Convert audio files locally between MP3, WAV, M4A, FLAC, AAC and OGG - one at a time or as a batch, no upload.
MIDI Converter
Convert MIDI files to WAV, MP3 or OGG locally - real synthesis in your browser with General MIDI sounds, no upload.
MP3 to WAV
Convert an MP3 file to uncompressed WAV locally in your browser - for editing and further processing. No upload.
WAV to MP3
Convert an uncompressed WAV file to space-saving MP3 locally in your browser - with a selectable bitrate. No upload.
M4A to MP3
Convert an M4A file (Apple AAC container) to the more universally compatible MP3 locally in your browser. No upload.
FLAC to MP3
Convert a lossless FLAC file to space-saving MP3 locally in your browser - for a phone or car stereo. No upload.
OGG to MP3
Convert an OGG Vorbis file to the more universally supported MP3 locally in your browser. No upload.
AAC to MP3
Convert a raw AAC file (.aac) to the more universally compatible MP3 locally in your browser. No upload.
WAV to FLAC
Convert an uncompressed WAV file to the noticeably smaller, still lossless FLAC locally in your browser. No upload.
Opus to MP3
Convert an Opus file (e.g. a WhatsApp voice message) to the more universally compatible MP3 locally in your browser. No upload.
AIFF to MP3
Convert an AIFF file from Logic Pro, GarageBand or an old Mac archive to space-saving MP3 locally in your browser. No upload.
DSD to FLAC
Convert a DSD file (.dsf) from an SACD rip or hi-res download to playable FLAC locally in your browser. No upload.
WMA to MP3
Convert an old WMA file (Windows Media Audio) to universally compatible MP3 locally in your browser. No upload.
AMR to MP3
Convert an AMR voice recording (phone voice recorder, old voicemail) to MP3 locally in your browser. No upload.
CAF to MP3
Convert a CAF file (Apple Core Audio Format, often from GarageBand or iOS voice memos) to MP3 locally in your browser. No upload.
MKV to MP3
Extract the audio track from an MKV file to MP3 locally. The video never leaves your device.
MOV to MP3
Extract the audio track from a MOV file (iPhone video, QuickTime) to MP3 locally. The video never leaves your device.
WebM to MP3
Extract the audio track from a WebM file (e.g. a downloaded web video) to MP3 locally. The video never leaves your device.
AVI to MP3
Extract the audio track from an old AVI file to MP3 locally. The video never leaves your device.
Video to WAV
Extract the audio track from any common video format (MP4, MOV, MKV, WebM, AVI) to uncompressed WAV locally. No upload.
Video to M4A
Extract the audio track from any common video format (MP4, MOV, MKV, WebM, AVI) to M4A locally - ideal for the Apple ecosystem. No upload.
Mono to stereo
Duplicate a mono audio file onto two identical channels (left + right) - for software or devices that strictly expect stereo. No upload.
Audio to text
Turn a spoken recording into written text - locally in the browser via AI speech recognition (Whisper), entirely without upload.
Text to speech
Turn typed text into a real audio file via AI speech synthesis, entirely locally in the browser - no server, account or upload.
Stereo to mono
Downmix a stereo recording to mono locally (channel average) - halves WAV file size and fixes one-sided recordings, no upload.
Tools
Normalize audio
Even out the loudness of one or several audio files locally to a target loudness (LUFS) - no upload.
Compress audio
Shrink an audio file locally in your browser to a chosen bitrate - for email attachments, messenger limits or tight storage. No upload.
Strip metadata
Remove title, artist, recording device and other embedded metadata from an audio file - lossless, no re-encoding, no upload.
Audio speed
Play an audio file faster or slower without shifting its pitch - for podcasts, audiobooks and lectures, locally without upload.
Reverse audio
Play an audio file backwards - for sound design, creative effects or the classic backmasking puzzle. Locally, no upload.
Split audio
Split a long audio file into several pieces - equal size, fixed duration or automatically at silent gaps. Locally, as a ZIP, no upload.
Find the BPM
Estimate the tempo (BPM, beats per minute) of a music track locally in your browser - for DJ sets, fitness playlists or production. No upload.
Find the key
Estimate the musical key (e.g. C major or A minor) of a music track locally in your browser - for harmonic mixing or remixes. No upload.
Create a spectrogram
Turn an audio file into a spectrogram image (PNG) - frequency content over time, for analysis, troubleshooting or teaching. Locally, no upload.
Remove noise
Remove fan noise, hiss, hum and other background sound from a recording via AI noise suppression - locally in the browser, no upload at all.
Record audio
Record your microphone locally as a WebM audio file - right in the browser, no software install, no upload.
Trim audio
Cut a section out of an audio file with second-level precision - locally in your browser, no upload, with lossless WAV or compact M4A output.
Merge audio files
Join several audio files into one in your chosen order - locally in the browser, no upload, even with mixed formats and sample rates.
Ringtone maker
Turn any song into a ringtone: pick a start point, cut up to 40 seconds, fade in and out smoothly - as M4R (iPhone), M4A or WAV, no upload.
Fade audio in/out
Fade an audio file in and out smoothly and change its volume in dB - as a PCM envelope right on the samples, locally in the browser, no upload.
Remove silence
Automatically remove long silent passages from recordings (dictation, podcasts, captures) - via level analysis, locally in the browser, no upload.
Swap left/right
Swap the left and right channel of a stereo file - for tracks recorded the wrong way round or side-reversed mixes, locally and without upload.
Edit MP3 tags
Edit an MP3 file title, artist, album, genre, year and track number (ID3 tags) - no re-encoding, the audio stays byte-for-byte untouched, no upload.
Create a waveform image
Turn an audio file into a waveform image (PNG) for podcast covers, social media or docs - light, dark or transparent, locally without upload.
Which tool do I need?
| Input formats | Output formats | Tools |
|---|---|---|
| MP4, M4V | MP3 | MP4 to MP3 |
| MP3, WAV, M4A, AAC, OGG, FLAC | MP3, WAV, M4A, FLAC, AAC, OGG | Audio converter |
| MID, MIDI, RMI | MP3, WAV, OGG | MIDI Converter |
| MP3 | WAV | MP3 to WAV |
| WAV | MP3 | WAV to MP3 |
| M4A | MP3 | M4A to MP3 |
| FLAC | MP3 | FLAC to MP3 |
| OGG, OGA | MP3 | OGG to MP3 |
| AAC | MP3 | AAC to MP3 |
| WAV | FLAC | WAV to FLAC |
| OPUS | MP3 | Opus to MP3 |
| AIFF, AIF | MP3 | AIFF to MP3 |
| DSF | FLAC | DSD to FLAC |
| WMA | MP3 | WMA to MP3 |
| AMR | MP3 | AMR to MP3 |
| CAF | MP3 | CAF to MP3 |
| MKV | MP3 | MKV to MP3 |
| MOV | MP3 | MOV to MP3 |
| WEBM | MP3 | WebM to MP3 |
| AVI | MP3 | AVI to MP3 |
| MP4, M4V, WEBM, MOV, MKV, AVI | WAV | Video to WAV |
| MP4, M4V, WEBM, MOV, MKV, AVI | M4A | Video to M4A |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Mono to stereo |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | TXT | Audio to text |
| Text input | WAV, M4A | Text to speech |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Stereo to mono |
| MP3, WAV, M4A, AAC, OGG, FLAC | MP3, WAV, M4A, FLAC, AAC, OGG | Normalize audio |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | MP3, M4A, OGG | Compress audio |
| MP3, FLAC, M4A, OGG | MP3, FLAC, M4A, OGG | Strip metadata |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | MP3, WAV, M4A | Audio speed |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Reverse audio |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Split audio |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | TXT | Find the BPM |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | TXT | Find the key |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | PNG | Create a spectrogram |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Remove noise |
| WebM | Record audio | |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Trim audio |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Merge audio files |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | M4R, M4A, WAV | Ringtone maker |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Fade audio in/out |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Remove silence |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | WAV, M4A | Swap left/right |
| MP3 | MP3 | Edit MP3 tags |
| MP3, WAV, M4A, AAC, OGG, OPUS, FLAC | PNG | Create a waveform image |
Formats in this category
| Input formats | AAC, AIF, AIFF, AMR, AVI, CAF, DSF, FLAC, M4A, M4V, MID, MIDI, MKV, MOV, MP3, MP4, OGA, OGG, OPUS, RMI, WAV, WEBM, WMA |
|---|---|
| Output formats | AAC, FLAC, M4A, M4R, MP3, OGG, PNG, TXT, WAV, WebM |