Audio converter that never uploads your files
Drop in any audio or video. AudioKit converts it to MP3, WAV, FLAC, M4A, OGG or Opus with ffmpeg running inside this tab, so the file stays on your device.
Drop audio or video files here, or choose them. Batch works.
Stays on this device: nothing is uploaded. You can also drag a file here or paste it.
MP3: sharing, podcasts, car stereos, anything that must just play.
Popular conversions
What “no upload” actually means
Most online converters send your file to a server, convert it there and send it back. That costs time on a slow connection, and it means a stranger’s computer holds your voice memo, interview or unreleased track.
AudioKit ships the converter to you instead. The page downloads ffmpeg compiled to WebAssembly, the same open-source engine behind VLC, YouTube’s pipeline and most video editors, and runs it in a background worker in your browser. Step through the path your file takes on the right.
You can check it yourself: open your browser’s developer tools, watch the Network tab while you convert, and you’ll see no request carrying your file. After the first visit the tools even work with Wi-Fi switched off.
Follow your file
Try your own numbers. A file on a upload link needs 32 s just to reach a server. In AudioKit that step is 0 s.
Everything else AudioKit does
- Video to MP3MP4, MOV, WEBM, MKV to MP3
- Extract audio from videoPull the original track out, losslessly
- Audio trimmerCut MP3 and any audio on a waveform
- Audio joinerMerge files, with crossfades
- Compress audioShrink to a target size
- MP3 compressorReduce MP3 file size
- WAV compressorShrink WAV to FLAC, MP3, M4A
- Audio editorTrim, cut out, fade, boost, speed
- Volume boosterBoost or normalise loudness
- Ringtone makeriPhone M4R and Android MP3
- Remove silenceCut pauses and dead air
- Speed & pitch changerFaster, slower, higher, lower
- Audio looperRepeat a clip or fill an hour
- Stereo to monoMix both channels into one
- MP3 to MP4Audio + picture for YouTube
- Reverse audioPlay any clip backwards
- Voice recorderRecord your mic to MP3 or WAV
- Transcribe audio to textAI transcript, summary and notes
Questions people ask
Is AudioKit really free, with no upload?
Yes. The converter is ffmpeg compiled to WebAssembly and it runs inside your browser tab. Your files are read from your disk into the page’s memory and the result is written back as a download. No server ever receives them, and there is no account, watermark or daily limit.
Which formats can I convert?
Input: practically anything ffmpeg reads, including MP3, WAV, FLAC, M4A, AAC, OGG, Opus, WMA, AIFF, AMR, CAF and the audio inside MP4, MOV, WEBM, MKV, AVI and 3GP videos. Output: MP3, WAV, FLAC, M4A, AAC, OGG Vorbis, Opus and iPhone M4R.
Why does the first conversion take a few seconds to start?
The first time, your browser downloads the audio engine (about 32 MB, compressed smaller in transit). It is cached afterwards, so later conversions start instantly and even work offline.
Is there a file size limit?
There is no limit set by us. Browsers cap WebAssembly memory at a few gigabytes, so audio files of any normal size are fine. Large videos are read in place rather than copied, which keeps memory use down. A phone with little free memory may struggle with multi-gigabyte videos.
Which bitrate should I pick for MP3?
192 kbps is transparent for most listeners on most music and is our default. Use 128 kbps for speech and podcasts, and 320 kbps if you want the maximum MP3 allows. Converting a 128 kbps file to 320 kbps doesn’t add quality back; it only makes the file bigger.
Does converting to WAV or FLAC improve quality?
No. Lossless formats keep exactly what they are given. If the source is an MP3, a WAV of it sounds identical to the MP3 and is about ten times larger. Convert to WAV when an editor or device requires it, not for quality.