Will the music replace the original sound?

Only if you want it to. You can drag the 'Video Volume' slider to 0 to mute the original, or keep it at 100 to hear both.

Can I add multiple songs?

Currently, you can add one audio file per merge. To add multiple, merge the first song, download the video, and then run it through the tool again with the second song.

What happens if the audio is longer than the video?

The final video length is determined by the VIDEO. The audio will be automatically trimmed (cut off) when the video ends.

What happens if the video is longer than the audio?

The audio will play once and then there will be silence. We are working on an 'Auto-Loop' feature to repeat the music to fill the video.

How do I sync the audio to a specific moment?

Currently, the audio starts at 0:00. To start it later, we recommend editing your audio file in an audio editor to add silence at the start before uploading.

Does it work on iPhone?

Yes. You can pick a video from your Photos app and an audio file from your Files app (iCloud Drive).

Can I use Spotify songs?

No. You must have the actual audio file (MP3) downloaded. We cannot access streaming DRM content.

Will the video quality degrade?

No. We copy the video stream directly (Pass-Through) whenever possible to prevent re-encoding quality loss.

Can I change the volume later?

Once you export, the audio is 'baked in' to the file. You would need to re-edit to change the mix.

Can I extract audio from a video to use as the music?

Yes! Use our 'Extract Audio' tool to turn Video A into an MP3, then use this tool to add that MP3 to Video B.

Add Music to Video

Add Music to Video Online: Merge Audio with Video (No Watermark)

A great video without great audio is like a Ferrari without an engine—it looks nice, but it doesn't go anywhere emotionally. Whether you are adding a lo-fi beat to a travel vlog, layering a voiceover onto a tutorial, or putting a trending song behind your Instagram Reel, the audio track is what captivates the audience.

Reelic's Add Music tool allows you to merge any audio file (MP3, WAV, AAC) with any video file (MP4, MKV, MOV) instantly in your browser. We give you full control over the mix. Want to keep the original camera sound and just add background music at 20% volume? Easy. Want to mute the original noisy wind and replace it entirely with a song? Done.

Unlike complex desktop editors that require you to manage "timelines" and "tracks", our tool is designed for the 99% of creators who just want to combine File A with File B. And because we process locally, your files stay private.

Perfect your video's audio track:

Noise Remover•

Extract Audio•

Free TTS

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Why Audio Matters More Than Video

Perceived Quality: Studies show that audiences will tolerate bad video quality (blurry, pixelated) but they will NOT tolerate bad audio (static, silence). Good audio makes a low-budget video feel professional.

Retention: Music sets the pace. A fast-paced song makes a video feel shorter and more exciting. A slow song makes it feel cinematic. Using the right track increases viewer retention (Watch Time) significantly.

Copyright Safety: Adding royalty-free music or your own voiceover is the best way to monetize your content without getting hit by copyright strikes on YouTube.

Mixing: Background vs. Replacement

Reelic offers two distinct ways to add audio:

1. Background Mode: This mixes the new song with the existing video sound. This is perfect for vlogs where you are talking to the camera but want a 'vibe' underneath. You can lower the music volume so it doesn't overpower your voice.

2. Replace Audio: This mutes the original video completely. This is ideal for drone footage (which usually sounds like a loud lawnmower) or B-roll where the original sound is just distracting noise.

Supported Audio & Video Formats

Video: MP4, MOV, MKV, AVI, WEBM, FLV.

Audio: MP3, WAV, AAC, OGG, M4A, FLAC.

We automatically convert everything to a standardized MP4 with AAC audio, ensuring your final file plays on every device.

How to Add Music to Video Online

Upload Video: Drag in your visual file.
Upload Audio: Drag in your song or sound effect.
Adjust Volume: Use the sliders. 'Original Video Volume' and 'Added Music Volume'.
Looping: If your video is longer than the song, the song will automatically loop if you check the box (coming soon). Currently, we play it once.
Export: Click 'Merge Audio'. Download your new MP4.

Privacy First

We know that audio can be sensitive (voice memos, private recordings). Reelic processes the merge locally on your computer. We do not upload your files to a cloud server.

Frequently Asked Questions

Everything you need to know about this tool.

Add Music to Video