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 96, 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 10
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.
- Add audio to videoPut music or a voice-over on a video, or replace its sound. Music ducks under speech by itself, loops and fades to fit. The picture is untouched.
- Fix audio out of syncSound late or early against the picture? Shift it by the millisecond, fix drift, or line up a separate mic recording by its waveform. The picture is untouched.
Compress & clean up 12
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.
- Hum removerRemoves 50/60 Hz mains hum and buzz with its harmonics, following the exact frequency through the file, and leaves the voice alone.
- Click and crackle removerClicks, pops and crackle out of vinyl and tape rips: each one rebuilt from the music either side, every other sample left exactly as it was.
- De-esserTurns down harsh "s" and "sh" sounds in a vocal, podcast or video, above the voice's own sibilance, and leaves everything else untouched.
- 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 22
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.
- Tap BPMTap along to any song to find its tempo, fitted through every tap to a tenth of a BPM, with off-beat taps ignored.
- 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.
- Seamless loop makerLoop any song, sample or ambience without a click: the end found where the sound matches the start, or exact bars at the tempo, crossfaded.
- Online TunerTune a guitar, bass, ukulele or violin through your microphone.
- Online MetronomeA steady click with subdivisions, tap tempo and a speed trainer.
- Vocal range testSing your lowest and highest notes and see them on a keyboard, matched to bass, baritone, tenor, alto, mezzo or soprano.
- Voice recorderRecord from your microphone in the browser — the audio never leaves your device.
- Microphone TestSee if your mic works, how loud and noisy it is, and hear yourself back.
- Online Tone GeneratorAny frequency, sweep or noise, left, right or both, and download it.
- 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.
- Audio to sheet musicSing, whistle or play a melody and get it written out: notes, tempo and key, printable, with MusicXML for MuseScore.
- Lyrics from a songThe vocal is separated and transcribed in your browser: the words line by line, as synced LRC for karaoke and players, or SRT for a lyric video.
Voice & speech 11
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.
- Remove filler wordsAI finds every um, uh and long pause in a podcast, lecture or video; review them in the transcript and cut them with clean joins.
- Bleep out swear wordsAI finds the swearing in audio or video and bleeps or mutes it, in sync.
Speed, pitch & effects 7
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.
- Audio Effects PluginsRun a file through free web audio plugins: fuzz, amp sims, reverbs, delays, phasers, pitch.
Check a file 3
What is really inside: the format, the loudness, and whether it is the quality it claims.
- Audio file infoBitrate, sample rate, bit depth and the bits really used, LUFS, true peak, clipping and DC offset for any audio file, many at once.
- Fake lossless detectorIs that FLAC, WAV or 320 kbps MP3 really what it says? Finds an MP3's cutoff, padded 24-bit and upsampled hi-res, with the spectrum to see it.
- Spectrogram viewerSee every frequency of any audio file over time, zoom into any moment, read the exact frequency and level, and save it as a PNG.
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 tool pages also show ads (Journey by Mediavine; none on this page), 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 tool pages 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.