Convert MP3 to MP4 Online
Turn an MP3 or any audio file into an MP4 video with a picture or a plain background. Choose 16:9, square or vertical, use the whole track or part of it, check the preview and download a video for YouTube, Instagram or TikTok.
Online editor to turn audio into video
Add an audio file and a picture, choose the frame and how the picture fills it, and check the result in the preview before you convert. Without a picture, the video shows a plain color.
How to convert MP3 to MP4
The converter turns an audio file into an MP4 video: the picture stays on screen for the whole sound, encoded as H.264 video with AAC audio, the format YouTube, social networks and phones accept.
Step-by-step
- Upload or drag and drop an MP3, WAV, M4A or another audio file.
- Add a picture, such as album art, a cover or a photo, or keep a plain background color.
- Choose the frame: 16:9 for YouTube, 1:1 or 4:5 for posts, 9:16 for Reels, TikTok and Shorts.
- Choose how the picture fills the frame and, if needed, the part of the audio to use.
- Check the preview, click Convert to MP4 and download the video.
What you can control
- Frame: 16:9 (1920 × 1080), 1:1 (1080 × 1080), 4:5 (1080 × 1350) or 9:16 (1080 × 1920).
- Picture fit: the whole picture over a blurred copy of itself, the whole picture on a color, or the picture filling the frame.
- Background color: for the space around the picture, transparent PNG areas or a video without a picture.
- Part of the audio: the whole track, or a start and end time.
- Output: MP4 with H.264 video at 25 frames per second and AAC audio at 192 kbps.
Why turn audio into video
To publish a song, a podcast episode or a voice recording as a video post on YouTube, Instagram, TikTok or Facebook, the audio first has to become a video. A still picture with the sound is the simplest way: the picture provides the video track and shows what people are listening to, and the sound is encoded to AAC for the MP4.
An MP4 is also handy in messengers and presentations, where a video with a picture is easier to notice than an audio attachment, and as a starting point for adding text, captions or more clips in the full editor.
Popular use cases
- Upload a song, a beat or a cover version to YouTube with its artwork.
- Post a podcast episode, an interview or a lecture as a video.
- Share a voice message or a music snippet on Instagram, TikTok or in Stories.
- Prepare a video to which you will add lyrics or captions in the full editor.
Choose the frame for the platform
16:9 suits YouTube and websites. For Instagram posts use 1:1 or 4:5, and for Reels, TikTok and YouTube Shorts use 9:16. A picture of another shape looks best with the blurred background: it fills the frame without cropping the picture.
Length, file size and sound quality
The video lasts as long as the audio, or as the part you select. A still picture takes little space, because the frame does not change: most of the file is the sound, about 1.5 MB per minute, so a three-minute song usually becomes a 5–9 MB video.
The sound is encoded once to AAC at 192 kbps, the audio format MP4 players expect; for most listeners it sounds the same as the original. It cannot sound better than the source, so a low-bitrate MP3 stays low quality. Audio files can be up to 200 MB, which is several hours of MP3.
Add audio, extract audio or keep editing
Add Audio To Video
Put music or a voice-over on an existing video instead of a still picture.
Extract Audio from Video
Do the opposite: save the sound of a video as MP3 or WAV.
Add Text To Video
Add a title, lyrics or a quote over the picture after converting.
Full Video Editor
Combine several pictures, clips, text and sound on one timeline.
Supported audio and picture files
Audio: MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WMA, AIFF and AMR. Pictures: JPG, PNG and WebP; a large photo is reduced to 3840 px on its longest side in your browser before upload, and a phone photo keeps its orientation. Some formats, such as WMA, AIFF or AMR, do not play in every browser: then there is no sound in the preview, but the file is still converted.
Need to Edit Your Video?
Add text, captions, more pictures or clips to the converted MP4 in the full online editor.
Learn more about video formats and sound
Frequently Asked Questions
Common questions about turning MP3 and other audio into MP4 video.
Is the MP3 to MP4 converter free?
Yes. It is free, you do not need an account, and the video has no watermark.
Can I convert MP3 to MP4 without a picture?
Yes. Without a picture the video shows the background color you choose, black by default.
What picture size should I use?
Smaller pictures work too, but may look softer when enlarged. For a sharp result without upscaling, use a picture that matches the chosen frame: at least 1920 × 1080 for 16:9, 1080 × 1080 for square, 1080 × 1350 for 4:5 or 1080 × 1920 for 9:16. If the picture has a different shape, the result also depends on how it fills the frame.
Can I use only part of the audio?
Yes. Enter the start and end time in the settings: the preview plays only that part, and the video is as long as the selection.
Which frame should I choose for YouTube, Instagram or TikTok?
16:9 for YouTube videos, 1:1 or 4:5 for Instagram and Facebook posts, and 9:16 for Reels, TikTok and YouTube Shorts.
Will the album cover from my MP3 be used?
Not automatically. If the MP3 has cover art, save the image and add it as the picture.
Does converting MP3 to MP4 reduce sound quality?
The sound is re-encoded to AAC at 192 kbps. This is a lossy re-encode, so the audio is not bit-for-bit identical to the source, although for most listeners it sounds the same. It cannot be better than the source: a low-bitrate MP3 stays low quality.
Can I convert WAV, M4A or other audio to video?
Yes. WAV, M4A, AAC, FLAC, OGG, Opus, WMA, AIFF and AMR files work the same way as MP3.