Convert to MP3

1. 01Choose a fileAudio or video, up to 100 MB. Only files you select yourself — URLs are not supported.
2. 02Wait for the engine, then the conversionThe engine downloads once and is then reused. Larger files take longer, and everything is happening on your own machine.
3. 03Download the MP3Your original file is untouched.

• Getting the audio out of a recorded call or lectureA video file is large and awkward when all you need is the sound. An MP3 is a fraction of the size and plays anywhere.
• Making a file play on something oldMP3 is the most widely supported audio format there is, which is why it remains the safe target for car stereos and older devices.
• Converting without installing anythingNo desktop software and no account, which matters on a machine where you cannot install things.

• Video to audioAn MP4 screen recording converts to an MP3 containing just the audio track. The video is discarded, so the result is dramatically smaller.
• A format that will not convertA QuickTime MOV screen recording usually holds HEVC video, which browsers cannot decode. The tool recognises this and says so up front rather than failing part-way with an unhelpful error.

• MP4, WAV, M4A and WebM are the reliable onesThey use codecs browsers can decode. MOV, AVI, FLV and WMV often do not, and the tool warns you before starting.
• Large files take real timeThe work happens on your own processor rather than a server farm, so a long video is genuinely slow. Leave the tab open while it runs.

Two different things are worth separating. Your file is never uploaded: it is read locally and passed to a WebAssembly build of ffmpeg running inside the page, so no audio or video of yours is transmitted anywhere, stored on a server, or retained after you close the tab. The engine, however, is a piece of software that has to be downloaded the first time you use the tool — that is the one network request involved, and it fetches the converter, not your content. Being precise about the difference matters more than a blanket privacy claim, because the distinction is exactly what a reader deciding whether to trust the tool needs to know.

A container such as MP4, MOV or AVI is a wrapper; what matters is the codec inside it. The browser build of ffmpeg supports a subset of codecs, and HEVC/H.265 — which Apple screen recordings and newer iPhone video commonly use — is not in it. The result is that two files with the same extension can behave differently depending on what is inside. The tool inspects the file up front and warns when it recognises a pattern that usually fails, so you are told before waiting rather than after. The practical fix is almost always the same: re-export to MP4 with H.264 video, or use the original audio file if you have one.

MP3 is a lossy format, so converting to it discards audio information permanently — this is a format change, not a lossless transfer, and converting an already-compressed file compounds the loss. Format support is not universal: it is bounded by what the browser build of ffmpeg can decode, which is narrower than desktop ffmpeg. And the tool only accepts files you choose yourself; it cannot fetch a URL, which rules out the most common reason people look for a converter and is a deliberate limit rather than a missing feature.

How do I convert a video to MP3?

Choose the file and the tool extracts the audio and encodes it as MP3 in your browser. Download the result when it finishes.

Is my file uploaded?

No. Your file is processed locally and never transmitted. The conversion engine itself is downloaded once, which is the loading step you see the first time.

Why did my MOV file fail?

QuickTime recordings usually contain HEVC/H.265 video, which browsers cannot decode. Re-export to MP4 with H.264, or use the audio file directly.

Is the conversion lossless?

No. MP3 is a lossy format, so some audio information is discarded. Converting a file that was already compressed compounds that.

Can I paste a link instead of a file?

No. Only files you upload yourself are supported; URLs are not.

How large a file can I convert?

Up to 100 MB. Audio and video conversion needs more browser memory than the source file itself, so the input limit is kept conservative to reduce crashes, especially on phones. Large files also take real time, because the work runs on your own machine.