Add Background Music to Audio Online - Free
Mix any voice recording with a music bed. 5 free tracks built in. MP3 or WAV in seconds.
Pi7 Add Background Music to Audio mixes any voice recording or audio file with a music bed underneath, all inside your browser. Pick from 5 built-in royalty-free tracks (Lo-Fi, Ambient, Soft Piano, Acoustic, Cinematic) or upload your own MP3, WAV, M4A, OGG, FLAC, or OPUS file. Set the voice and music volumes, and download the mixed result as MP3 (192, 256, or 320 kbps) or lossless WAV.
The default 100% voice / 30% music balance is podcast-ready out of the box. Voice and music are mixed digitally using the Web Audio API and FFmpeg compiled to WebAssembly, so the final file is one clean track. No upload, no signup, no watermark.
How to Add Background Music to Your Audio in 3 Steps
- Drop or select your voice or audio file (MP3, WAV, M4A, AAC, OGG, FLAC, OPUS, AIFF supported)
- Pick a built-in music chip (Lo-Fi, Ambient, Piano, Acoustic, Cinematic) or upload your own track. Click Play to preview the music before you commit.
- Adjust the Voice and Music volume sliders, pick MP3 or WAV output, and click Add Background Music. The mixed result plays in the page and downloads with one click.
Need to record a fresh voice instead of uploading? The audio recorder with background music captures voice and music in one pass. Need to trim a long voice recording first? The audio cutter handles that in seconds.
Five Free Music Tracks Built In
Five royalty-free tracks ship with the tool, ready to drop under any voice without sourcing your own:
- Lo-Fi (Easy Lemon): mellow chill bed, perfect for podcast intros and casual voice notes
- Ambient (Atlantean Twilight): melodic atmospheric pad, great for meditation guides, sleep stories, and ASMR
- Soft Piano (Gymnopedie No 1): Erik Satie's calm piano, ideal for poetry readings, affirmations, and reflective voice-over
- Acoustic (Wholesome): warm folk acoustic, fits storytelling, audiobooks, and family voice messages
- Cinematic (Inspired): uplifting orchestral feel, great for inspirational scripts and motivational content
You can also upload any audio file as your own custom music bed. Need to extend a short clip to fit a long voice recording? The audio looper stretches any clip to a target length with seamless crossfades.
Set the Right Voice and Music Balance
After mixing dozens of test takes across podcast, meditation, and voice-over use cases, these four presets cover almost every situation:
- Voice 100% / Music 30%: the default - voice clearly on top, music as a supporting bed. Use for most podcasts and voice-over.
- Voice 100% / Music 15-20%: very subtle bed. Use for long-form narration and audiobooks where the music must not pull attention.
- Voice 100% / Music 50%+: music more present. Use for intros, transitions, and outros where the music IS the moment.
- Voice 70% / Music 60%: performance / spoken-word mix. Use for poetry, monologue, and meditation guides where voice and music share the spotlight.
The Music volume slider also controls the live preview, so you hear exactly what the final file will sound like before you commit.
When to Add Music to a Voice Recording
- Podcast post-production: add a music intro / outro / bed to a clean voice take
- Audiobook narration: warm acoustic music behind storytelling chapters
- Meditation and sleep tracks: ambient pad under a guided meditation script
- Affirmations and hypnosis: calm piano under affirmation recordings
- Voice-over demos: polish a voice-over reel with cinematic music
- YouTube voice essays: bed music under a pre-recorded narration
- Phone IVR / on-hold messages: light music behind voice prompts
- Storytime / kids content: soft music behind narration
- Wedding speeches and toasts: emotional bed music behind audio recordings
100% Local Mixing - No Server, No Account, No Limits
Your privacy matters more to us than anything else. We do not upload your files. We do not see them. We do not store them. That is not a marketing line - it is the actual architecture of this tool.
Cloud audio mixers ask you to upload your voice file, wait in a processing queue, and trust them not to keep a copy. Pi7 skips that whole loop. Your voice file and your music track are read by JavaScript and FFmpeg compiled to WebAssembly directly inside this browser tab, mixed there, and the resulting MP3 or WAV is built without any of your bytes ever touching a remote server. We literally cannot hear your audio even if we wanted to.
The user-facing translation: you do not sign in, do not enter an email, do not watch an upload bar. Drop your audio, pick a music chip, click Add Background Music, and a few seconds later you have a finished file you can download or right-click to copy. Refresh the tab and the session is gone forever - it never existed anywhere except the JavaScript memory of this page.
Because the mixing runs on your CPU instead of a remote machine, you can re-process the same file thirty times trying different beds without hitting a rate limit. The export has no Pi7 watermark because no premium tier exists to upsell. And once the page is loaded, the tool keeps working offline - useful when you are mixing on the train or a flight.
Frequently Asked Questions
Is the built-in music free for commercial use?
Yes. The five built-in tracks are licensed under Creative Commons BY 4.0 (Music by Kevin MacLeod). You can use the output commercially, including on monetized podcasts, YouTube, and audio projects, as long as you credit the composer when required. Tracks you upload yourself follow whatever license that source has.
What audio formats can I use as input?
Any common audio format works as input for both your voice file and your custom music file: MP3, WAV, M4A, AAC, OGG, FLAC, OPUS, AIFF. The output is your choice of MP3 (192, 256, or 320 kbps) or lossless WAV.
Start Adding Music to Your Audio
Drop your voice file, pick a music track, hit Add Background Music, and grab your result in seconds. Fast, free, and fully private - only in Pi7 Audio Tool.