MP3 to MP4 Converter
Add a background to your audio file and convert it to an MP4 video
Features
Convert audio to video with just one click
Use default settings to create an MP4 with a black background
Support for solid colors and image backgrounds
Position jacket images with full-frame display or center crop
4 sizes to match your platform
Choose from landscape, square, or portrait video dimensions
Export with H.264 and AAC
Industry-standard video and audio formats widely supported by video platforms
How to Use
Select an audio file to convert
Choose from MP3, WAV, M4A, OGG, or FLAC and verify the playback duration
Set the background with a solid color or image
Select a background color, or choose an image in PNG, JPEG, or WebP format and specify how to fit it
Select a video size for your platform
Choose from 1920×1080, 1280×720, 1080×1080, or 1080×1920
Convert and preview
Click the convert button, play the preview to verify, then download your video
Use Cases
Upload music to YouTube
Add album art to demos or recordings and publish them as videos
Distribute podcasts as videos
Post podcast audio to video platforms to reach more listeners
Create vertical short-form videos
Use 1080×1920 format for short videos and reels where audio is the focus
Share audio recordings as videos
Turn lectures or recordings into image-backed videos to share on video platforms
Knowledge Base
Why can't audio files be uploaded directly to video platforms?
Video sharing services like YouTube require video files that contain visual content. Audio-only files like MP3 cannot be uploaded as-is. By combining audio with a still image or solid color background to create a video file like MP4, audio-focused content can be posted as video.
MP4, H.264, and AAC: How they relate
MP4 is a container format that combines video and audio into a single file. The compression methods for the contents are specified separately.
- H.264：H.264 is a video compression standard widely supported by computers, smartphones, and video platforms.
- AAC：AAC is an audio compression format commonly used in MP4 files. It maintains good sound quality at bitrates comparable to MP3.
Most of a still-image video's file size comes from audio
Still-image videos have minimal differences between frames, so video compression is very efficient. For example, audio encoded at 192 kbps AAC takes up about 86 MB per hour, making file size primarily determined by audio duration.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
Conversion to MP4 video is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
Audio and images and input suggestions are not stored on the server.
Follow RAKKOTOOLS on Google Search
199 useful tools become easier to find from Google Search and AI Search!
- Found in search
- Also shown in AI Search
- Discover new tools
Updates
- update #355
Added MP3→MP4 conversion to create videos for posting with background colors or images added to audio
Featured Tools
RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
Use in streaming and videos
Use various tools such as lottery draws and raffles in live streams and videos.
Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
If you mention it, I get motivated to create more tools!
If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.