How the extension works
The tool uses ACE-Step, a music model that can continue audio. It listens to your track, then writes new music after it in the style you describe. Your browser joins the new part to your song and exports one MP3.
| Setting | Range | Notes |
|---|---|---|
| Seconds to add | 10 to 107 | Each run adds one continuation at the end |
| Style text | Up to 200 characters | Genre, tempo, instruments, mood |
| Lyrics | Optional, up to 600 characters | Leave off for an instrumental continuation |
| Song length | Any; up to 4 minutes sent whole | Longer songs: only the last 90 seconds are sent |
What to expect
- The new part is a fresh AI continuation. It is similar in feel but not identical, and the singer will not be the same person.
- Instrumental tracks extend more convincingly than dense, vocal-heavy ones.
- The join can be audible. Run it again for another take, or cross-fade in an editor.
- It does not stretch or loop your existing audio; if you only need a longer loop, use the audio joiner.
- Use music you have the rights to. The result is not a licence to use someone else's song.
We do not store your audio. Your browser shrinks it to a small file, sends it over HTTPS to our API, and we pass it to our AI provider (fal.ai) for the job; the result comes back to your browser. Do not use it for recordings you are not allowed to share with a processor.
Pricing
1 free extension a day per visitor, then 10 credits each. Pro and packs include credits.
Frequently asked questions
Does it loop my song to make it longer?
No. It writes new music after the end. To repeat sections, use the audio joiner or cutter.
Will it sound like the original artist?
No. It continues the style and feel, but the new part is a new AI generation, and vocals will not be the same singer.
How many seconds can I add?
Between 10 and 107 seconds per run.
What if my song is long?
Songs up to 4 minutes are sent whole. For longer songs only the last 90 seconds are sent, and the new part is added at the end of the full song.
Can I extend the start of a song?
Not in this version. The new part is added at the end.
Is it free?
One extension a day is free. After that 10 credits each.
Is my song stored?
Not by us. It is processed by our AI provider, fal.ai, for the job and the result returns to your browser.