Multimedia
Convert MP4 to MP3 in the local app
For audio and video, Nua Convert uses the desktop app with local FFmpeg. MP4 (MPEG-4 Part 14) is the number one standard compressed video digital container of universal compatibility in the world. MP3 is the lossy quality compressed audio codec that revolutionized music distribution due to its ultra-lightweight size. The web does not simulate conversions or upload files: it takes you to the native flow to process media privately.
What is MP4?
Universal digital video container of high compression.
- ✓ Native support in 100% of players and browsers
- ✓ Excellent quality-to-weight ratio with H.264/H.265 codecs
- ✓ Embeds subtitles and multi-channel audio
- ✗ Extreme compression can introduce artifacts in fast-moving scenes
Why convert to MP3?
The most popular lossy compressed audio format on the planet.
- ✓ Absolute compatibility on any player in the world
- ✓ Extremely reduced file size
- ✓ Ideal for general voice and music distribution
- ✗ Discards inaudible frequencies reducing fidelity
- ✗ Not suitable for professional editing and mastering
Other popular Multimedia conversions
Local-First Philosophy
Your files stay at home. By pure architecture.
I designed Nua Convert with a very simple golden rule: the best way to protect your files is to never have them. That's why all processing is executed 100% in your browser using modern JavaScript, Canvas, and WebAssembly APIs.
The server only sends you the web page to load. Once you're inside, you can disconnect from the internet if you feel like it: the workspace will continue to function perfectly locally. No tricks, no catches, no strings attached.
Web vs Desktop
Use web for fast tasks. Download the App for heavy duty.
The browser is great for quick, daily tasks like optimizing a PNG, formatting code in a pinch, or compiling a fast PDF. But if you need to convert gigabytes of video, transcode entire folders of music, or compress giant files, the Nua Convert desktop app takes full advantage of every core of your processor, without the memory limits imposed by Chrome or Firefox tabs.
Nua Convert Web
Prepare file on web and process the heavy part in the app
- Selection of format MP4 to MP3 and direct route to the native app
- Real privacy: your media files are not uploaded to the browser or servers
- The desktop app works offline with local FFmpeg
- Real media transcoding within the web tab
- Mass processing (complete folders at once)
- Super-fast native conversion (up to 20 times faster)
Nua Convert Desktop
Full local power of your computer
- Ultra-fast conversion of MP4 to MP3 without browser limits
- Supports giant files (videos and audios of more than 50GB)
- Native batch processing of entire folders with one click
- Integrated hardware acceleration (GPU/graphics card)
- Total integration with your computer's context menu