Can I completely mute the original video?

Yes. Replace audio mode discards the original soundtrack.

Can I keep original speech under background music?

Mix mode adds the music to existing audio and provides separate gain controls.

Does the tool supply licensed music?

No. Upload audio you own or are authorized to use.

SOLVORY MEDIA LAB · ADVANCED TOOL

Add Music & Replace Audio in Video

Add a soundtrack to video, replace the existing audio or blend music with original sound, adjust levels, start delay, fades and export a synchronized MP4.

Browser-first processingSmart metadata previewLocal exports

ADVANCED LIVE WORKSPACE

Make your media work beautifully.

Awaiting files

Drop files or choose mediaSupported formats depend on your browser’s decoder and the processing engine. Files are processed locally.Choose files

Professional controls

Adjust before export

Choose your source media to get started.

Source / output reviewCheck the originals and final exports

PREVIEW

◉Media previewUpload a file to see it here.

THE WORKFLOW, EXPLAINED

How to add audio to video online

Replacing the soundtrack removes the original sound; mixing combines tracks at adjustable levels. Use music you have rights to use. The editor processes supplied audio, not external streaming URLs.

Upload a video, then select one owned soundtrack or narration file.
Choose Replace or Mix, music volume, start delay and optional fades.
Review audio synchronization, render MP4 and listen to the complete output.

Music mixing needs explicit choices

Replacing the soundtrack removes the original sound; mixing combines tracks at adjustable levels. Use music you have rights to use. The editor processes supplied audio, not external streaming URLs. This workspace uses browser-local media codecs for output creation. First-time processing may require downloading a sizable WebAssembly engine; conversion speed, available encoders and supported formats depend on the device, source file and browser. Review the exported video or audio before relying on it professionally.

Helpful next steps

For complementary workflows see our Video Compressor, Audio Trimmer, Video Trimmer and all video tools. Read the FFmpeg command-line documentation for the fundamentals of codec choice, filtering and mapping, and ffmpeg.wasm architecture documentation for browser execution constraints.