Is my audio uploaded?

No. Files are decoded, edited and encoded again in your browser, and the result is handed straight back to you. Transcription runs a speech model on your own device: it is downloaded once, the first time you use it, and your recording never leaves the page.

Which formats can I open and save?

MP3, WAV, M4A, AAC, FLAC and OGG open on most pages, and the sound track of an MP4 or MOV video can be taken out as MP3 or WAV. Most editing pages save as MP3, M4A or WAV; each page lists exactly what it reads and writes.

How large a file can I use?

The format converters and the editors that are used on whole songs and long recordings, such as trimming, speed and noise reduction, take files up to 150 MB on the free plan; a few others, such as fading and vocal removal, take 20 MB. The free plan allows 5 runs a day; Pro removes these limits.

Is there a watermark or a sign-up?

Neither. Nothing is added to the sound, and there is no account to make for the free plan.

Audio tools

Every audio page on Nouplo in one place: format converters, cutting and joining, volume and noise, effects such as slowed + reverb and voice changing, and recording and transcription. The sound is processed in your browser and never uploaded.

Convert audio
Cut, join and clean up
Speed, pitch and effects
Record and transcribe

Convert audio

♪ Convert audio MP3, M4A or WAV, converted on your device and never uploaded. ♪ WAV to MP3 A WAV is about 10 MB a minute. An MP3 is not. ♪ MP3 to WAV For the software that will only take uncompressed audio. ♪ M4A to MP3 The format your iPhone records in, in the one everything reads. ♪ FLAC to MP3 Lossless at home, something that fits on the phone. ♪ OGG to MP3 Including the voice notes that arrive as .opus. ♪ AAC to MP3 The bare stream, in the container everything reads. ♪ Video to MP3 The sound out of your video, as an MP3, made on your device. ♪ MP4 to WAV The sound of a video as an uncompressed WAV, extracted in your browser.

Cut, join and clean up

✂ Trim audio Keep the part you want. Unlike video, the cut lands exactly where you put it. ♪ Merge audio Several recordings, one file, in the order you set. ♪ Join audio files Several recordings, one file, in your order. ⫖ Split audio at silences One long recording in, a file for every stretch of sound out. ⏸ Remove silence The pauses between sentences, cut out automatically, with the joins smoothed so there are no clicks. ◢ Fade audio in and out A clean start and a clean ending. ◖ Increase audio volume Quiet recordings made louder and even, without clipping. ◖ Normalize audio Measured first, then brought to an even level — without clipping. ≋ Remove background noise from audio Fans, hiss and hum taken out from under a voice. ♪ Vocal remover What is dead centre in the mix, taken out — or kept. ☎ Ringtone maker Drop a song and get a ringtone of its best part, ready for an iPhone (M4R) or an Android phone (MP3).

Speed, pitch and effects

♪ Slowed + reverb maker Slower, deeper, dreamier — any song, in seconds. ♪ Nightcore maker Faster and higher — the nightcore sound. ♪ 8D audio converter Put on headphones: the music turns round your head. » Change audio speed Faster or slower sound, at the same pitch. ♯ Change the key of a song Move a song up or down by semitones at the same tempo, to sing or play along in your key. ◅ Reverse audio Any sound, played backwards. ◍ Voice changer Robot, deep, chipmunk, echo or telephone — for any recording. ◍ Deep voice changer A deeper voice for any recording, same speed.

Record and transcribe

● Voice recorder Press record, speak, and save an MP3 — nothing is uploaded. ● Mic test Is your microphone working? Find out in five seconds. ❝ Japanese speech to text Japanese recordings and videos into a transcript and SRT subtitles, without the audio leaving your device. ❝ Transcribe audio to text English recordings into a punctuated transcript and SRT subtitles, on your own device. ❝ Meeting recording to minutes Who said it, when they said it, and the headings ready for what you decide it meant. ❝ WhatsApp voice message to text Read it instead of listening to it, without sending it to anyone. ❝ Automatic subtitles Speech recognised and timed into a subtitle file, on your own computer. ◗ Text tools Text to speech Paste text, press Play, follow along word by word.

Frequently asked questions

Is my audio uploaded?: No. Files are decoded, edited and encoded again in your browser, and the result is handed straight back to you. Transcription runs a speech model on your own device: it is downloaded once, the first time you use it, and your recording never leaves the page.
Which formats can I open and save?: MP3, WAV, M4A, AAC, FLAC and OGG open on most pages, and the sound track of an MP4 or MOV video can be taken out as MP3 or WAV. Most editing pages save as MP3, M4A or WAV; each page lists exactly what it reads and writes.
How large a file can I use?: The format converters and the editors that are used on whole songs and long recordings, such as trimming, speed and noise reduction, take files up to 150 MB on the free plan; a few others, such as fading and vocal removal, take 20 MB. The free plan allows 5 runs a day; Pro removes these limits.
Is there a watermark or a sign-up?: Neither. Nothing is added to the sound, and there is no account to make for the free plan.