Add Music to Video
Add background music or any audio track to your videos. Choose to replace the or...Add background music or any audio track to your videos. Choose to replace the original audio completely or mix your new audio with the existing sound....
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Supported Formats
Input Formats
Output Formats
Audio Addition Features
Add music to any video easily
Why Use Add Music to Video?
FFmpeg Amix and Amerge Filters for Professional Audio Layering
The server uses FFmpeg's amix filter to combine multiple audio streams with independent volume control, or the amerge filter to merge channels into a single output. When you choose 'Replace', the original audio stream is discarded and the new audio is muxed directly into the MP4 container alongside the video stream. When you choose 'Mix', both audio streams are decoded to PCM, mixed at the specified volume ratio using the amix filter's duration and dropout_transition parameters, then re-encoded as AAC at 128 kbps with a 44,100 Hz sample rate.
HubSpot Research Shows Videos With Music Get 2x Longer Watch Time
According to HubSpot's video marketing statistics, videos with background music retain viewers up to twice as long as silent videos. Wistia's engagement data shows that the average retention rate for videos with intentional audio design is 52 percent, compared to 30 percent for silent or poorly mixed content. The right background music creates emotional context that keeps viewers engaged through the entire message, particularly important on social platforms where autoplay starts muted and users decide within 3 seconds whether to enable audio.
Three-Tier Volume Control From Background to Full Replacement
The volume parameter maps to FFmpeg's volume audio filter: 50 percent multiplies the audio amplitude by 0.5 (approximately -6 dB), reducing the music to a subtle bed under speech. 75 percent (-2.5 dB) provides a moderate presence. 100 percent keeps the full amplitude, ideal for complete audio replacement. These levels follow broadcast mixing conventions where background music typically sits 12 to 20 dB below dialogue in professional video production.
Video Stream Copied Byte-for-Byte While Only Audio Changes
The video stream is never decoded or re-encoded. FFmpeg copies the video bitstream directly from input to output using stream copy mode (-c:v copy), which means zero generational loss, zero re-compression artifacts, and processing that completes in seconds rather than minutes.
Common Use Cases
Perfect music for every video
Social Media Content
Add trending music or custom soundtracks to your social media videos. Make TikToks, Reels, and YouTube content more engaging.
Voiceover with Background
Mix subtle background music with your original voiceover. Creates professional-sounding tutorials and presentations.
Music Video Creation
Replace video audio with your chosen music track. Perfect for creating music videos, montages, and visual accompaniments.
Business Presentations
Add professional background music to corporate videos, training content, and marketing materials.
How It Works
Upload Your Video
Drag and drop your video file. Support for MP4, MOV, AVI, WebM formats up to 2GB.
Upload Audio File
Upload your music or audio file - MP3, WAV, M4A, or AAC format.
Choose Audio Mode
Select 'Replace' to remove original audio or 'Mix' to combine both audio tracks.
Download Video with Music
Click 'Add Music' and download your video with the new audio track.
Pro Tips for Adding Music
Match Audio Length
Trim your audio to match video length before adding. Or use our Audio Trimmer first for precise timing.
Volume for Mixing
When mixing with existing audio (like voiceover), use 50% volume so the music doesn't overpower speech.
Use Royalty-Free Music
For content you'll publish, use royalty-free music to avoid copyright issues. Many free libraries exist online.
Preview Before Publishing
Always preview the final video with headphones. Check that audio levels and timing work well together.
Frequently Asked Questions
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