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Add audio to video

Easily add music to video online using Synthesia. Upload your own audio file, or choose from a large library of stock media.

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Add the perfect background music to your video

Easily add music that fits your video content perfectly. Upload songs or choose from a large selection of stock music tracks.

Choose from a library of stock audio tracks

Don't have your own audio? Find the perfect music track from our large stock music library.

Adjust the audio inside the video editor

Effortlessly sync your audio and video tracks, adjust volume, add music to selected video segments, and loop songs all inside the video editor.

How to add background music to video


Find or create a video

Log in to Synthesia, and either choose an existing video file, or create a new video from scratch.


Choose or upload the audio track

Enable the 'Music' toggle on the right, and either upload your own audio, or find a stock song. Adjust the volume and duration of the audio inside the editor.


Download the video clip

Once you're done editing the audio and video, simply download the video and upload to the platform of your choice.

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Add music to video using Synthesia

Multiple formats supported

You can upload songs in the following audio file formats: mp3, .wav, .ogg, .aac, .flac.

Generate voiceover audio using AI

With Synthesia, there's no need to record, edit and upload a voiceover. Simply use the built-in AI voiceover generator to create voiceovers from text in seconds.

Create videos for social media

Add audio to video and use our handy aspect ratio presets to quickly create videos for YouTube, Instagram, TikTok, and other platforms.

Perfect tool for video editing beginners

Synthesia is a browser-based tool that allows users to create and edit videos from scratch, with no experience or complex video editing tools.

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4 tips for adding music to video

Adding music to video content is easy, but making the music fit the video perfectly takes skill. Here are some tips to get you started.


. Fit the music to the mood

The audio in a music video will be different to the background music and sound effects in video podcasts. Add music that fits the topic and emotion of your video perfectly.


Be mindful of audio volume

Loud music can be distracting for viewers. Adjust the volume of the audio track using the handy 'Volume' slider in Synthesia.


Use a variety of audio tracks

Different scenes call for different songs, so switch up the audio tracks to fit the video clips. And sometimes, no audio clips are required for better viewing experience.


Be aware of licensing

If you're publishing the video, ensure the music is licensed for use. Use either your own music or simply add stock audio files.


Frequently asked questions

How do you add background music to a video?

Here's how to add background music to video:

  1. Log into Synthesia and either select an existing video or start a new project.
  2. Activate the 'Music' option on the right side of the editor.
  3. Upload your own music track or choose a stock song provided by Synthesia.
  4. Adjust the music track's volume and length according to your video requirements.
  5. Download the edited video to your computer.
  6. Upload the video with the added background music to your chosen platform.

Can I add music to my video for free?

To add audio to videos online for free, consider platforms like Free Music Archive, Incompetech, or YouTube Studio Library, ensuring you choose tracks with appropriate licensing for your intended use. Always check and respect licensing agreements to avoid copyright issues when publishing your video.

What app do I use to add music to a video?

To add music to video online, use Synthesia. Using the browser-based tool, you can not only add to audio to your video file, but also generate AI voiceovers and presenters from scratch.

How do you add background music to a video on Iphone?

To add music to video on an iPhone:

  1. Open the iMovie app on your iPhone.
  2. Start a new project in iMovie.
  3. Import the video you want to edit into the project timeline.
  4. Tap the "+" icon and select 'Audio'.
  5. Choose a soundtrack or a song from your music library to add to your video.
  6. Drag the audio track to align it properly with your video content.
  7. Adjust the audio track's start and end points to fit your video as needed.
  8. Export the edited video to your iPhone's camera roll or share it as you prefer.

How to change audio of a video?

To change a Synthesia video's original audio, simply head over to the 'Music' tab on the right hand side, and change the song. Either add songs from the stock media library, or upload your own song.