Voice recorder

Record from a microphone on your device, pause and go on, then trim, clean up and save in any format. Free, with no account or uploads.

Record

Channels

MonoStereo

Mono for a voice. Stereo only when the microphone has two channels; otherwise both sides are the same.

Let the browser clean up the voice

Its echo cancelling, noise suppression and automatic level, made for calls. Off, the sound is exactly what the microphone gives.

Keep a draft while recording

The take is kept on this device as it is recorded, so a closed tab or a crash does not lose it; it is deleted when the take is finished. Starts off every time.

The browser asks before the microphone is used. The sound stays on this device and goes into the list of files as a WAV, ready to be edited and written in any format.

Or drop sound you already have

Recordings and files go into the same list, to be trimmed, cleaned up, made louder and written in any format. On your device. You can also paste with ⌘V or Ctrl+V.

Choose files

MP3
M4A
Opus
FLAC
WAV
AIFF
MP4
MOV
WebM

Stays on your device · up to 50 files at once

This page is the Audio editor, opened for recording.

What you can do

Trim, fade and change the volumeTo the millisecond, on a waveform you can zoom; every edit can be undone, and your file is never changed.
Every common formatMP3, M4A (AAC), Opus, FLAC, WAV and iPhone ringtones, from those and from AIFF, Ogg and the sound of videos.
Loudness to a standardMeasured as ITU-R BS.1770 does, normalized to −14 LUFS or another target, with a true-peak limiter so nothing clips.
Sound out of videoKept exactly as it is, without being encoded again, whenever the format allows; or converted to the format you choose.
Checked before you downloadEvery file written is opened again and listened to: its length, rate and channels are held against what you asked.
Many files at onceTags and cover art kept, gapless MP3s, a size limit if you need one, and everything in one ZIP.
Nothing is uploadedYour files are read and written in this browser. No account, no limits.

A little help along the way

Follow the steps below. Every option is explained underneath.

Press RecordAllow the microphone when the browser asks. Choose mono or stereo first if you like.
Watch the levelKeep it out of the red: the page says when the sound reaches full scale.
Pause, go on, stopPause as often as you like; Stop and keep puts the take in the list of files.
Edit and saveTrim it, take the noise away, make it louder, and download it as MP3 or any other format.

Every option explained

Recording: Press Record and allow the microphone when the browser asks. The sound is taken as the browser hands it over, 32-bit floats at the device's own rate, so nothing is lost; it goes into the list of files as a WAV when you press Stop, to be trimmed, cleaned up, made louder and written in any format. Long takes are kept a second at a time and never held whole.
Pause and go on: Pause stops taking sound and Go on takes it again, in the same file. The sound fades out and in over 5 ms at each pause, so the join does not click.
Level: The meter shows how loud the microphone is. When the sound reaches full scale the page says so: move back, or turn the input down, since sound past full scale is cut off for good.
Microphone and channels: Choose the microphone once the browser has allowed one, and mono (for a voice) or stereo. Letting the browser clean up the voice turns on its echo cancelling, noise suppression and automatic level, which are made for calls; off, the sound is exactly what the microphone gives.
Keep a draft while recording: Off at first, every time. On, the take is kept on this device as it is recorded, so a closed tab or a crash does not lose it (up to the last second before it stopped); the next visit offers to add it to the files or delete it, and finishing a take deletes it. It is never sent anywhere.
Same as the file: Keeps the file's own sound as it is, without decoding and encoding it again: AAC goes into an M4A, MP3 stays MP3, Opus and Vorbis go into Ogg, FLAC stays FLAC and plain samples become a WAV. Nothing is lost and it takes a moment. When the rate, the channels or a size limit you chose mean the sound must change, it is encoded again in its own kind; sound that cannot be kept (such as AC-3 from a film) becomes AAC, and the page says so.
MP3: Plays everywhere. Written with LAME at a constant bitrate, with the header that tells players the encoder's delay and padding, so the file is exactly as long as the sound. Below 32 kHz an MP3 holds at most 160 kbit/s.
M4A (AAC) and M4R: Smaller than MP3 for the same quality, and played by every phone and computer. Written with your browser's own AAC encoder, or one that comes with the page when it has none. The encoder's priming is measured and an edit list written, so the sound starts and ends where it should. M4R is the same for an iPhone ringtone, which can be at most 40 seconds long (an alert tone 30).
Opus: The best quality for its size, voice above all. It is always written at 48 kHz. Browsers, Android, VLC and recent Apple devices play it.
FLAC and WAV: Lossless: every sample is kept. FLAC is about half the size of WAV. Choose 16-bit (CD quality), 24-bit, or for WAV 32-bit floating point; FLAC holds at most 24 bits.
Quality: Small, Balanced or High set the bitrate for each format (MP3 96, 192 or 320 kbit/s; AAC 96, 160 or 256; Opus 48, 96 or 160), less for mono. Custom lets you pick the bitrate. These numbers are KeepSimp's own choices.
Sample rate and channels: Keep the file's own, or choose one. When a format cannot hold the rate asked, the nearest it can is used and the page says so. Lossy formats here are mono or stereo, so surround sound is mixed down to stereo for them.
Tags and cover art: Title, artist, album, year, genre and the cover picture go into the new file where its format holds them. Switch it off to write none.
File size limit: MP3, M4A and Opus are written at the highest bitrate that keeps each file under the limit, with room for the container; the page says what it chose. Lossless formats cannot be made to fit a size.
The check: Every file written is opened again and decoded from start to end. Its length, sample rate and channels are held against what was asked, an MP3's size against its bitrate, and a file that came out silent is caught. If something is not as asked, the page says what.
Files the browser cannot read: Some browsers' decoders lack a kind of sound (Safari's lacks FLAC in some places). The page then decodes it with the browser's own player, which plays more kinds, and goes on. AIFF is read by KeepSimp itself. A file nothing here can decode says so.
Privacy: Files are read and written in this browser and never uploaded. There is no account and no limit on how many you convert.

Read the step-by-step guide