Free MP3 to MP4 Converter
Turn a local MP3 or browser-decodable audio file into a genuine MP4 with a private generated title card.
MP3 to MP4 Converter
Download MP4Enter a value to begin.
How to use this mp3 to mp4 converter
- Choose an MP3, enter optional title text, select a background colour, dimensions and bitrate, then keep this tab open during real-time MP4 encoding.
- Check the inputs and preview, then use the primary action.
- Download, copy or use the result shown by the tool.
How the result is calculated
Canvas generates a title card and playback-progress visual while Web Audio routes the locally decoded audio into MediaRecorder. The page accepts only an actual browser-supported MP4 recording type with H.264 and audio encoding; it never relabels another container. Current Chrome or Safari support is required, and source-codec support, exact timing, quality and file size depend on the browser.
Method source: MDN MediaRecorder format-support documentation.
All calculation and transformation work happens in this browser tab. No entered value is sent to an Noler Tools application server.
Important limitations
Results are provided for convenience and should be checked independently before an important decision. A format or checksum result never authenticates an identity, document, account, licence, vehicle or registration.
Frequently asked questions
Is this mp3 to mp4 converter free?
Yes. It is free to use and does not require an account.
Does Noler Tools save my input?
No. The input and result remain in temporary browser memory and are not uploaded or saved by this site.