Short answer
These audio tools run entirely inside the web browser using a WebAssembly build of FFmpeg. Because the processing is local, files are never uploaded to a server, there is no length or size limit imposed by the service, no account is required, and no audio watermark or spoken tag is added to the output.
Shrink a music track or a voice recording to a fraction of its size.
Turn any audio file into an MP3 that plays on everything.
Keep just the part of a recording you actually need.
Fix a recording that is too quiet, too loud, or uneven.
Shrink an uncompressed WAV to a tenth of its size or less.
Make an iPhone voice memo or an AAC track play anywhere.
Get an uncompressed PCM file for editing or for software that demands one.
Audio is the cheapest thing on this site to process. A three-minute track is a few megabytes rather than a few hundred, so the encoder finishes in seconds even though it is running as WebAssembly inside a browser tab — the gap between this and a native desktop application is barely noticeable at these sizes.
These tools share the FFmpeg engine the video tools already use, so if you have converted a video here the engine is already cached and an audio job starts instantly. Output is MP3 wherever a compressed format makes sense, and uncompressed WAV where an editing chain needs it.
Yes. There is no paid tier, no daily limit, no account and nothing appended to the output. The processing runs on your device, so there are no server costs to recover per file.
No. Every tool processes the file inside your browser. You can verify this by opening your browser's network panel, or by disconnecting from the internet after the page has loaded — the tools keep working.
There is no limit imposed by the service. Audio is small enough that a two-hour recording is comfortable on a normal laptop and usually fine on a phone.
MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WMA and the audio track of any common video container. The output is MP3 or WAV depending on the tool.
Once the page and the encoder have loaded, yes. The engine is cached by your browser and needs no further network access to process files.
