Adding background music to a video transforms how it feels — a silent product demo becomes polished, a travel montage becomes cinematic, a social clip becomes scroll-stopping. But the process trips people up: you need to handle the original audio, find music you’re legally allowed to use, and combine the two tracks cleanly without one drowning out the other.
This guide covers the complete workflow from start to finish — how to prepare your video, where to find free and royalty-free music, and which tools handle the actual mixing. Some steps use free VideoToolShack browser tools; others point you toward the right editor for the job.
Step 1: Decide What to Do with the Original Audio
Before adding music, you need to decide what happens to your video’s existing audio. There are three scenarios:
- Replace entirely — your original audio has background noise, no useful sound, or you want music only. Mute the video first, then add music over silence.
- Mix music under speech — you want background music at low volume behind a voiceover or interview. The original audio stays; music plays underneath it.
- Keep original audio only — you’re just making sure the audio is clean before uploading. Skip ahead to the compression and format steps.
For scenario one — the most common — start by muting your video with the free Mute Video tool. It strips the audio track entirely in your browser with no quality loss to the video. You’ll then have a silent video file ready to receive your music track. See the full guide on how to remove the audio track from a video for more detail on when to mute versus when to extract.
Extract before you mute if you might need the original later
Use the
Audio Extractor to save a copy of your original audio as an MP3 before muting. Once you mute and export, the original audio is gone from that file. Keeping a backup costs nothing and takes 30 seconds.
Step 2: Trim Your Video to the Right Length
Music and video need to match in length — or at least feel intentional in how they relate. Before you find a music track, lock your video’s final length using the Video Trimmer. Trim to the exact start and end points you want, then note the duration.
When you go looking for music, you’ll search for tracks close to that length — or choose a track you can fade out at the right moment. Trying to edit music length around a video you haven’t locked yet creates unnecessary rework.
Step 3: Find Music You’re Legally Allowed to Use
This is where most people get into trouble. Using a commercial track without a license — even for a short clip — can result in your video being muted, taken down, or monetized by the rights holder on YouTube. For anything you plan to publish, you need music that’s explicitly licensed for your use case.
Genuinely Free Options
- YouTube Audio Library — hundreds of tracks free to use in any video, including monetized YouTube content. Available at studio.youtube.com under the Audio Library tab. No account required to browse; you need a Google account to download.
- Free Music Archive (freemusicarchive.org) — large catalog of Creative Commons licensed music. Filter by license type; for commercial use look for CC0 or CC BY licenses. Read the specific license on each track before using.
- ccMixter (ccmixter.org) — community remixes and original tracks under Creative Commons. Good for ambient and electronic styles.
- Pixabay Music (pixabay.com/music) — royalty-free tracks with no attribution required. Quality varies but there are genuinely usable options, especially for background ambience.
Paid Royalty-Free Libraries (Worth It for Serious Creators)
Free libraries are limited in quality, style range, and licensing clarity. If you’re producing content regularly — YouTube, client work, social media campaigns — a paid royalty-free subscription removes all the uncertainty and dramatically expands your options. The two most widely used are Epidemic Sound and Artlist, both of which offer broad commercial licenses that cover YouTube monetization, social media, and client deliverables.
Don’t use “no copyright music” from YouTube without checking
Tracks labeled “no copyright music” or “copyright free” on YouTube are not automatically safe to use. Many are still under standard copyright and the uploader has no right to license them. Always verify the actual license from the original source before using any track commercially.
Step 4: Add the Music to Your Video
This is where the free Add Audio to Video tool comes in. For the most common case — replacing the audio entirely with a music track — it handles everything in your browser in one step. For mixing music under existing speech, you’ll need a multi-track editor.
For Full Replacement: Add Audio to Video Tool (Browser, Free)
Upload your muted video and your music file to the free Add Audio to Video tool. Choose whether to loop the music if it’s shorter than the video, trim the video to the music length, or end with silence. Download the result as MP4 or WebM. Everything runs in your browser — no software needed, no uploads to a server.
For Mixing Music Under Speech: CapCut or Filmora
If you need music playing under a voiceover — keeping both tracks — you need a multi-track editor. CapCut (free, browser and app) is the quickest option for social clips. For YouTube videos or client work where precise volume control and fade points matter, Filmora handles multi-track audio cleanly and includes a built-in royalty-free music library.
For Full Control: DaVinci Resolve (Free)
DaVinci Resolve’s Fairlight audio page gives you professional-grade multi-track mixing for free. Steeper learning curve than Filmora, but if you’re already editing in Resolve, adding music is straightforward. Best for creators who want full control over audio levels, EQ, and dynamics.
The volume balance rule
Background music should sit 10–15 dB below your speech level. If your voiceover peaks at -6 dB, aim for music at around -18 to -20 dB. Most editors show this as a waveform — your music waveform should look noticeably smaller than your voice waveform. If they’re the same size, the music is too loud.
Step 5: Compress and Optimize the Final File
Adding a music track increases your file size, sometimes significantly depending on the audio bitrate of the track you used. Before uploading or sharing, run the output through the Video Compressor to bring the file size down without visible quality loss. This is especially important for TikTok (287 MB mobile cap) and email sharing.
If you’re uploading to YouTube, compression before upload isn’t necessary — YouTube re-encodes everything anyway. But for direct sharing, social DMs, or embedding on a website, keeping the file under 50–100 MB makes a meaningful difference. See the full guide on how to compress a video without losing quality for the right settings.
Step 6: Check Your Format Before Uploading
Most editors export to MP4 by default, which is correct for almost every destination. If your editor gave you a MOV or WebM file, convert it using the free Format Converter before uploading. YouTube, TikTok, Instagram, and LinkedIn all prefer MP4 H.264 — it uploads fastest and processes most reliably. See the best video format guide if you’re unsure which format to target.
The Complete Workflow at a Glance
1
Decide on original audio
Mute the video with the Mute Video tool if replacing audio entirely. Extract first with Audio Extractor if you want a backup.
2
Lock your video length
Trim to final duration using the Video Trimmer. Note the runtime before searching for music.
3
Source your music
YouTube Audio Library for free use. Epidemic Sound or Artlist for professional/commercial work. Verify the license before using any track.
4
Add the music
Full replacement: use the free Add Audio to Video tool in your browser. Mixing music under speech: use CapCut, Filmora, or DaVinci Resolve.
5
Compress if needed
Run the output through the Video Compressor before sharing directly or uploading to size-limited platforms.
6
Check your format
Convert to MP4 H.264 using the Format Converter if your editor output anything other than MP4.
Platform-Specific Notes
Planning Content Worth Scoring
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