tooloora

Audio Tools — convert, cut, merge & extract, all local

Free audio tools that run entirely in your browser — your recordings are never uploaded.

Runs locally — nothing is uploaded

Convert AudioConvert single files or a whole batch, pick the MP3 bitrate yourself — processed locally, nothing is uploaded.Cut AudioDrag the handles in the waveform, listen to the selection, fade the edges and export it — locally in your browser, no upload.Change Audio VolumeRaise or lower the level in decibels, normalise to peak, or hit a loudness target in LUFS — locally, no upload.Merge Audio FilesPut several recordings in order, optionally crossfade the transitions and export one file — locally in your browser, no upload.Extract Audio from VideoPull the sound out of your own video: copy the original track losslessly, or get an MP3 that plays everywhere — locally, no upload.

Everything stays on your device

Every audio tool runs entirely in your browser. No uploads, no storage, no queue.

Audio tools that never upload your recordings

Most online audio converters send your files to their servers. tooloora's audio tools do not. Converting, cutting, changing volume, merging and pulling the sound out of a video all happen in your browser, on your own device. There is no queue, no server-side size limit and no signup — and no file that ends up somewhere else.

Why this matters more for audio

Audio files are rarely trivial: interviews, voice messages, lectures, conversations, raw music takes. A tool that never transfers such a file does not have to promise anything. You can verify it: open the page, switch to airplane mode, convert a file — it still works, because the decoders and encoders are served by this site itself and not by a third-party CDN.

What you can do here

The cards above always show the current set:

  • Change format — MP3, WAV, M4A, OGG and FLAC, in batch and with a selectable MP3 bitrate.
  • Shorten — set start and end and export only the part you need.
  • Fix the level — quieter, louder, or normalised without clipping.
  • Join — several recordings one after another in a single file.
  • Audio from video — MP4, MOV, WebM and MKV, optionally copied losslessly.

How much space does audio need?

The maths is simple, because a constant bitrate means exactly that: 192 kbit/s is 192 000 bits per second, divided by 8 that is 24 000 bytes per second — so one minute of MP3 takes about 1.44 MB. Uncompressed CD-quality audio (44.1 kHz, 16 bit, stereo — defined by the Red Book standard, published as IEC 60908) runs at 1,411.2 kbit/s, which is roughly 10.6 MB per minute.

Honest limits

Processing in the browser uses your device's memory. For editing, the audio track is decoded, and every stereo minute at 44.1 kHz then occupies about 21 MB (44,100 samples × 2 channels × 4 bytes per floating-point value × 60 seconds). That is why the memory-hungry tools are capped at 30 minutes per file; extracting from video streams instead and may be longer. And not every device can write every format: MP3 and WAV work everywhere, while AAC, Opus and FLAC depend on your browser's encoders — the tools check this beforehand and tell you, instead of failing after the click.

Frequently asked questions

Are my audio files uploaded to a server?

No. Every tool here decodes and encodes in your browser, using WebAssembly and the browser's own codecs. Your recordings never leave your device, and no third-party CDN is contacted.

Is it really free and without limits?

Yes. Because the work happens on your device, there is no server cost, no queue and no file-size paywall — and no signup. The only real limit is your device's memory: decoded audio needs about 21 MB per stereo minute.

Which audio tools are available?

Converting between MP3, WAV, M4A, OGG and FLAC, cutting a file down to the part you need, changing its volume, merging several files into one, and extracting the audio track from a video. The cards above always show the current set.

Which formats can I use?

Input: everything your browser can decode — MP3, WAV, M4A/AAC, FLAC, in most browsers OGG, plus MP4, MOV, WebM and MKV video. Output: MP3 and WAV on every device; M4A, OGG and FLAC when your browser provides the encoder. The tools show upfront what is possible instead of failing after the click.

Can I download audio from YouTube here?

No. These tools only process files that are already on your device. We deliberately do not offer downloads from streaming platforms — that usually breaks their terms of use and, depending on the source, copyright.