free, runs in your browser, nothing uploads
Convert an audio file. Without uploading it anywhere.
Drop an MP3, WAV, M4A, FLAC, MP4 — whatever you have. We convert, cut, or clean it right here in the tab. It never touches a server. Your unreleased track stays yours.
drop an audio or video file
We'll auto-detect the format and let you pick what to do with it. Drop multiple files for batch conversion.
Or jump straight to a job
01.Why this site
Most "online audio converter" sites ask you to upload a file you wrote, recorded, or paid for to a server in someone else's country, wait in a queue, and then trust them to delete it. That is silly. Your browser can already decode and encode audio. We wrap Web Audio and a slim FFmpeg-WebAssembly build in a clean drop target, and that is the whole site — there is no upload endpoint to trust, because there is no upload.
Nothing leaves the tab
Open this page, switch off your wifi, then drop a file. It still converts. That is the test, and you can run it right now.
Nothing to install
No download, no signup, no daily quota, no watermark on the way out. You are already where you need to be.
Real controls
Bitrate, sample rate, channel count, LUFS target — actual values you pick, not three presets and a "Pro" wall.
Batch is normal
Drop forty voice memos, get forty MP3s back as a zip. Not a feature we ration by the day.
02.Pick a tool
All 78, grouped by what you are actually trying to do. Each row scrolls sideways — or see the full list.
Convert a file 23
Find the pair you have. Nothing is uploaded for any of them.
Cut, trim & arrange 8
Change how long it is or what order it is in, not what format it is.
- Audio EditorA multitrack timeline with live effects, automation and MIDI tracks: cut, mix, record and export, on a phone or a laptop.
- Audio CutterDrag handles on a waveform and keep only the part you want.
- Audio JoinerConcatenate several files into one, in the order you choose.
- Ringtone MakerA 30-second clip from any song, in the format your phone wants.
- Auto-Cut SilenceShorten the pauses between phrases, keeping speech natural.
- Remove silenceStrip dead air out of a podcast, voice memo or voiceover.
- Trim silence off the endsTop and tail a recording, leaving the middle untouched.
- Fade in / fade outClean fades on both ends without opening an editor.
Compress & clean up 9
Too big to send, too quiet to hear, or too noisy to use.
- Compress an audio fileGet a file under an email, Discord or upload size limit.
- Normalize AudioBring files to a consistent level so nothing jumps out.
- LUFS Loudness NormalizerMatch the loudness target Spotify, Apple or broadcast expects. Works on video too.
- Amplify quiet audioMake a too-quiet recording usable without driving it into distortion. Works on video too.
- Remove background noiseStrip hiss, hum and fans with spectral gating, or traffic, typing and barking behind a voice with an AI denoiser. Works on video too.
- EQ & bass boosterAdjust bass, mids and treble, or boost the low end, baked into the file.
- Stereo to monoFix one-sided recordings and halve the size of voice files.
- Mono to stereoHonest dual-mono for software that insists on two channels.
- Change the sample rateResample to match a project and stop import warnings.
Make music 15
Pull a mix apart, fix the pitch, find the tempo, record a take.
- StemFlipper — stems, MIDI and playable instrumentsSplit a song into stems and transcribe each one to MIDI, in your browser with nothing uploaded — or on a free GPU for four stems plus samples and instruments.
- AI vocal remover / stem splitterNeural separation into a clean instrumental and acapella, running on your machine.
- Vocal remover / karaokeRemove the vocal from a stereo song, or isolate it, by cancelling the centre. Works on video too.
- Autotune / Pitch CorrectionSnap a vocal to a key — subtle tuning or the hard-tuned effect.
- Audio to MIDITurn a hummed melody or bassline into a MIDI file.
- BPM FinderDetect the tempo of a track, with half and double time shown.
- Key FinderFind the key of a song, with its Camelot code, tuning and BPM.
- Chord FinderGet the chords of a song from audio, bar by bar, and follow along.
- Sample SlicerChop a break at the hits, play the slices on pads, export for SP-404 or MPC.
- Online TunerTune a guitar, bass, ukulele or violin through your microphone.
- Online MetronomeA steady click with subdivisions, tap tempo and a speed trainer.
- Voice recorderRecord from your microphone in the browser — the audio never leaves your device.
- Record computer audioRecord the sound a browser tab is playing, losslessly — Chrome and Edge only.
- Split an audio fileCut one long recording into equal parts, fixed chunks, or at the silent gaps.
- MP3 tag editorEdit title, artist, album and cover art without re-encoding the audio.
Voice & speech 9
Speech to text and text to speech, with the models running in your tab.
- Text to speechA free AI voice generator in your browser: type or open a PDF or Word file, 41 natural voices in 7 languages, MP3 download, no sign-up.
- Voice cloningClone a voice from five seconds of a recording or audio file and make it say anything, free, on your own GPU, with consent.
- Transcribe audio to textMP3, voice memo or video to text with Whisper in your browser: a transcript, SRT or VTT and speaker labels, free, nothing uploaded.
- Enhance speechOne click to a cleaner voice: AI noise removal, clarity EQ, gentle compression and podcast loudness. Works on video. A free alternative to Adobe Podcast Enhance.
- Add subtitles to videoAuto captions in 99 languages with Whisper in your browser: edit them, then burn them in for TikTok and Instagram or add an SRT track. No watermark.
- Speech to text (voice typing)Talk and it types, with punctuation, in 99 languages: Whisper in your browser, so your voice is never uploaded.
- AI video dubbing and translationTranslate a video's speech into English, Spanish, French, Italian, Portuguese or Hindi and have an AI voice read it over the original, timed to it, nothing uploaded.
- Voice changer (live or files)Change your voice live through the mic, or a voice in a recording or video: deeper, higher, male to female, chipmunk, robot or radio.
- EPUB or PDF to audiobookAn EPUB, PDF or TXT file to an M4B audiobook with chapters, or an MP3 per chapter, read by a free AI voice in your browser.
Speed, pitch & effects 6
Change how a track moves rather than what format it is in.
- Slowed + Reverb MakerSlow a song, drop the pitch with it, and put it in a room.
- Nightcore MakerSpeed a song up and lift its pitch — nightcore and sped-up edits.
- 8D Audio MakerMove a track slowly around your head — on headphones, it circles.
- Change audio speedSlow a song or speed a podcast without shifting the pitch.
- Pitch & key changerShift the key up or down by semitones without changing the tempo.
- Audio ReverserPlay a file backwards — for effects, or to hear what is buried.
For a specific app or device 8
One program, one spec, already filled in — so the import works first try.
- Audio for Whisper16 kHz mono WAV — exactly what Whisper wants, in one click.
- Podcast prepNormalize, mono mixdown and MP3 encode in a single pass.
- Compress audio for DiscordFits under the upload limit without you doing the maths.
- Audio for CapCutThe format CapCut imports without complaint.
- Audio for DaVinci ResolveThe format Resolve always imports, no conform errors.
- M4A to WAV for AudacitySkip the FFmpeg install Audacity keeps asking you for.
- Prep audio for transcriptionThe format each transcription service actually wants.
- WAV for SP-404 / MPCThe exact spec hardware samplers need, or they fail silently.
03.FAQ
Does my audio actually stay on my device?
Yes. Open this page, switch to airplane mode, then drop a file. It still converts. That's the test, and the whole point of the site.
Why does my browser need a moment to "warm up" the first time?
For most conversions we load a small WebAssembly module (around 3 MB) on first use. After that it's cached and instant. Simple MP3 encoding doesn't need it at all.
Which formats can I convert between?
MP3, WAV, M4A, AAC, FLAC, OGG, OPUS, and audio extracted from MP4, MOV, WebM, MKV. Most common pairs go both directions.
What about DRM-protected files like Apple Music or Spotify?
Those are encrypted and we can't decrypt them. That's a feature, not a bug. Use the original app to export, or buy the unprotected version.
How big can the file be?
Around 500 MB is a safe ceiling on a modern laptop. We can sometimes handle more, but past 1 GB the browser starts running out of memory.
Are you keeping any data?
An analytics ping: page views, which tool you used, whether it worked. No audio data, no filenames, no personal identifiers. The site also shows ads (Journey by Mediavine), whose partners use cookies to choose them; the privacy page has the details and the opt-outs. You can change your choice from the cookie settings link in the footer.
Why is this free?
The work happens on your computer, so there are no servers to pay for — the whole site is static files on a CDN. No accounts, no upsell and no Pro tier; ads on the page pay for the rest.
Can I batch-convert a folder of files?
Yes. Drop multiple files at once and you get a zip of all the outputs. Online converters that gatekeep batches behind a paywall — we don't do that.
Can I install this as an app?
Yes. In Chrome or Edge there is an install icon in the address bar; on an iPhone use Share → Add to Home Screen. It then opens in its own window and keeps working with no connection at all, because the tools were never talking to a server. On Android you can also share a file straight into it from another app.
Why is a converted MP3 sometimes a different length than the original?
MP3 encodes in frames of 1,152 samples, so the encoder pads the end out to a whole frame — usually a few tens of milliseconds. If you need a sample-exact length, convert to WAV or FLAC instead.
Will it work on my phone?
Yes, just slower because phone CPUs are slower at decoding. iOS has stricter memory caps, so very large files may fail on Safari.