Merge Video & Audio
Online & Free
Upload any video and audio file to instantly merge them into a perfectly synced video. Add music, voice overs, podcasts, narration, or replacement audio online — no editing software required.
Adding audio to a video shouldn't require a full editing suite
Whether you want to add music to a video, replace sound in a recording, create a video with voice over, sync podcast audio with visuals, or merge MP4 and MP3 files, Video Audio Merger makes it simple — no timeline, plugins, or editing experience needed.
How it works
Three steps to merge audio and video
Upload your video
Click "Upload files" under Video and select your clip. MP4, MOV, WebM, AVI — all common formats are supported.
Upload your audio
Click "Upload files" under Audio and choose music, narration, commentary, podcasts, sound effects, or replacement audio in MP3, WAV, AAC, and more.
Merge & download
Hit "Merge" and your synced video is ready in seconds. Preview it instantly in-browser or download your merged MP4 and MP3 combination immediately.
Features
Everything you need to merge video & audio
Add music to video, replace audio tracks, attach narration, sync commentary, or create polished voice over videos — all from a fast browser-based merger tool.
Add Music or Replace Audio in Any Video
Merge video and audio online by adding background music, narration, podcasts, or replacement sound tracks. Supports MP3, WAV, AAC, MP4, MOV, WebM, and more.
Perfect Audio & Video Sync
Keep audio and video perfectly aligned in the merged output. No drift, no timing issues — just smooth playback from start to finish.
Voice Over Video Maker
Create a polished video with voice over by uploading narration separately and syncing it with your footage in one click.
Merge MP4 and MP3 Instantly
Combine MP4 and MP3 files online without unnecessary re-encoding. The fastest way to merge audio and video while preserving original quality.
Add Audio to Video Online
Attach songs, sound effects, commentary, interviews, or podcast audio to any video clip directly in your browser — no editing software required.
Instant In-Browser Preview
Preview your merged video immediately after processing. Watch before downloading without opening another media player.
Auto-Saved Merge History
Every merged video is securely stored in the cloud so you can revisit, download, or continue editing anytime.
Use cases
Who uses this video audio merger?
Social Media Creators
Add trending music, meme sounds, commentary, or voice overs to reels, Shorts, and TikTok videos without using a complicated editor.
Educators & Tutors
Merge narration with tutorials, presentations, and screen recordings to create professional explainer videos online.
Indie Filmmakers
Replace noisy on-set audio, sync clean studio recordings, or attach cinematic soundtracks to your footage in seconds.
Gamers & Streamers
Combine gameplay clips with commentary, reactions, Discord audio, or background music for YouTube and streaming content.
Podcast Creators
Turn podcasts and interviews into shareable video clips by syncing audio with visuals for social media platforms.
Marketing Teams
Localize ads, add voice overs, attach campaign music, or merge promotional audio tracks with video content at scale.
Frequently asked questions
How do I combine an audio track with a video using this tool?
It’s a simple three-step process: upload your video file, upload your audio file (music, voice-over, or podcast), and click the Merge button. The tool automatically syncs them into a single file that you can preview instantly in your browser before downloading.
Can I use this to completely replace the original sound in my video?
Yes. Whether you want to swap out noisy background audio for a clean studio recording, add a localized voice-over, or replace the audio entirely with an MP3 track, you can easily overlay your new audio right in your browser.
Can I use this tool to create voice-over videos or add background music?
Absolutely. You can record your narration or commentary separately and upload it alongside your footage. It’s also perfect for adding background music, cinematic soundtracks, or ambient audio to videos for social media, tutorials, or presentations.
What file formats does the merger support?
We support all common audio and video formats. You can readily merge MP4 and MP3 files, but the tool also accepts video inputs like MOV, WebM, and AVI, as well as audio formats like WAV, AAC, and OGG.
Will merging the audio track lower my original video quality?
Not at all. The tool attaches the new audio track directly to your video without forcing any unnecessary re-encoding. Your final video will download with its original resolution and crispness completely intact.
Do I need to install an app or create an account to use this?
No installation or software downloads are required. The merger works entirely in your web browser (including Chrome, Safari, and Edge) on devices like Chromebooks, Macs, and Windows PCs. It’s designed to let you get in, merge your files, and get out without dealing with complex editing timelines.
Does the final downloaded video have a watermark?
No, your exported video will be completely clean and free of any watermarks.
What happens if my audio track is longer or shorter than my video?
By default, the merged video will naturally end whenever the shorter of the two tracks finishes. If you need a precise match, we recommend trimming or looping your files to the exact same length before you upload them.
Ready to merge video and audio online?
Add music to video, merge MP4 and MP3, create voice over videos, sync commentary, or replace sound in any video online.
No watermark · No unnecessary re-encoding