Question 1

Is my video uploaded to a server?

Accepted Answer

No. The conversion runs entirely in your browser using your device's own video engine. Your file never leaves your computer, and there is nothing for us to store or delete.

Question 2

Which format should I pick?

Accepted Answer

M4A is smallest and copies the original audio with no quality loss. WAV is uncompressed and large. MP3 is the most widely compatible.

Question 3

What does "copies the track" mean?

Accepted Answer

M4A takes the existing audio out of the video without decoding it, so the result is bit-for-bit the original. WAV and MP3 both re-encode.

Question 4

Why would I want WAV?

Accepted Answer

Editing. WAV is uncompressed, so an editor or transcription tool can work on it without a lossy generation in the middle. Expect roughly 10 MB per minute.

Question 5

Can I extract just one speaker or channel?

Accepted Answer

No. The whole mixed track comes out as it is. Splitting channels or speakers is a job for an audio editor.

Question 6

Is it free, and is there a watermark?

Accepted Answer

It is free with no watermark, no sign-up, and no export limit. There is nothing to buy here; the paid plan is on the Recast desktop app, which is a different product.

Question 7

How large a file can I convert?

Accepted Answer

The whole file is held in your device memory, so the ceiling depends on your machine. The upload panel shows the limit it worked out for your device, and it will tell you before it starts rather than failing halfway.

Question 8

Which browsers work?

Accepted Answer

Chrome, Edge, and other Chromium browsers have the broadest support. Firefox and Safari handle some operations. The page probes your browser on load and says plainly if a step is unsupported, so you never wait on a conversion that cannot run.

Question 9

Does it work on a phone?

Accepted Answer

It runs, but a phone has far less memory than a laptop, so keep the file small. For anything long, use a desktop browser.

Question 10

Does it work offline?

Accepted Answer

Once the page has loaded, yes. Nothing is fetched during the conversion, so it keeps working with the connection off.

Question 11

Why is my browser fan spinning?

Accepted Answer

Video work is CPU-heavy and it is happening on your machine rather than on a server. That is the trade for not uploading anything. Closing other tabs helps on a long file.

Extract Audio from Video

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