Uwarp

Video or GIF

Audio track

First run downloads FFmpeg (~25 MB) once in this browser. To remove sound only, use /mute-video.

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Add sound to video or GIF online

Add sound to video or GIF online free. Attach MP3/WAV music to MP4 or animated GIF and download MP4 — replace or mix audio, no server upload.

What is an add-sound-to-video tool?

This tool adds an audio track to a video or animated GIF — for example music on GIF, GIF with sound, or how to add audio to video. Because GIF cannot embed sound, GIF uploads are converted to MP4 with your music. Processing runs in the browser with FFmpeg WebAssembly.

Add sound to video features

Attach music or voice to video and GIF, privately in the browser.

  • Add audio to video

    Upload MP4, MOV, or WebM plus MP3/WAV/M4A and download a single MP4.

  • Music on GIF / GIF with sound

    Combine an animated GIF with an audio file; output is MP4 with sound.

  • Replace or mix

    Replace the original soundtrack, or mix the new track with existing audio.

  • No server upload

    Merging runs locally with FFmpeg WebAssembly.

  • Shortest length match

    Output ends when the shorter of video or audio finishes.

How to add audio to video

Add sound to a video or GIF in three steps.

  1. Upload visual

    Drop an MP4, MOV, WebM, or GIF (up to 200 MB).

  2. Upload audio

    Add MP3, WAV, M4A, AAC, or OGG (up to 100 MB).

  3. Add sound and download

    Choose Replace or Mix, click Add sound, then save the MP4.

Great for

Common add-sound and GIF-with-music scenarios.

  • GIF with music

    Turn a silent GIF into a shareable MP4 with a soundtrack.

  • New voiceover

    Replace a clip’s audio with narration or music.

  • Layered mix

    Keep the original bed and mix in a second track when both matter.

  • Quick social edits

    Attach a short audio bed before posting without a desktop NLE.

Frequently Asked Questions

Quick answers about this tool—open a question to read more.