Free Video Tool
Audio Replacer
Replace the audio track in any video with your own audio file. Short audio is automatically looped to match the video length.
Free to use · 30 replacements per day · 100 MB max file size. Sign in for higher limits or add credits for unlimited access.
Drop your video here
or click to browse
MP4, WebM, MOV, MKV, AVI
Drop your audio here
or click to browse
MP3, WAV, FLAC, OGG, AAC, M4A, OPUS
How It Works
Upload Both Files
Drop or select your video file and the replacement audio file. We support all major video and audio formats.
We Replace the Audio
Our servers strip the original audio and attach your new track. If your audio is shorter, it loops automatically.
Download the Result
Download your video with the new audio track. The output is MP4 with the same video quality as the original.
Features
Automatic Audio Looping
When your audio is shorter than the video, it automatically loops to fill the entire duration. No manual editing needed.
Preserves Video Quality
The video stream is copied directly without re-encoding, preserving the original resolution, frame rate, and visual fidelity exactly.
Wide Format Support
Accepts MP4, WebM, MOV, MKV, and AVI for video. Supports MP3, WAV, FLAC, OGG, AAC, M4A, and OPUS for audio.
Fast Processing
Powered by FFmpeg on AWS infrastructure for fast, reliable audio replacement even on large video files.
Frequently Asked Questions
What happens if my audio is shorter than the video?
The audio is automatically looped to match the video duration. For example, a 30-second audio file paired with a 2-minute video will loop 4 times. You can see the loop count before processing starts.
What happens if my audio is longer than the video?
The audio is trimmed to match the video length. Only the portion of audio that fits within the video duration is used.
What is the maximum file size?
Guest users can upload files up to 100 MB. Free members can upload up to 500 MB. Paid users can upload files up to 2 GB. Create a free account to increase your limit.
What output format is used?
The output format matches your input video. MP4 files get AAC audio, WebM files get Opus audio, and MKV files get AAC audio. The video stream is preserved without re-encoding.
Is my data safe?
Yes. Files are uploaded over HTTPS, processed in isolated containers, and automatically deleted after processing. We do not store or share your files.
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