How Multi Looper works

A section in Multi Looper is a named, colored, speed-configured range within a YouTube video. It has a start time, an end time, an optional name, a color, and a per-section playback speed. You can have as many sections as you want per video. Sections are stored locally in your browser — no account, no sync, no cloud.

Sections are first-class objects. You can check and uncheck them to include or exclude them from the current playback session. You can drag them to reorder the playback order. You can edit any field on any section at any time.

When you press play in the Loop Playback panel, Multi Looper walks through every checked section in order. For each section, it seeks the YouTube player to the start, sets the playback speed to the section's speed, plays until the end time, then moves to the next section (with optional fade or instant jump).

Transitions between sections can be instant (hard cut) or faded. Fade duration is configurable in milliseconds. After cycling through every checked section once, Multi Looper can either loop forever or stop — configurable in the After Cycle setting.

Gradual speed-up is an optional mode that increases the global playback speed by a configurable percentage after each full cycle of sections, up to a configurable maximum. It is the automated implementation of the classic "slow first, then speed up" practice method used by every teaching tradition.

Increment per cycle is typically 3-5%. Max speed is usually 1.0x (or 1.1x for a small headroom push). When max is reached, the mode either holds or stops, depending on your After Cycle setting.

Multi Looper has a full keyboard shortcut layer for hands-on instrument practice. Space: play/pause. Arrow left/right: seek 5 seconds. Shift + arrow: seek 1 second. Square brackets [ and ]: jump to previous / next section. Minus and plus: speed down / up by 0.05. M: mark current position. L: loop-to-here (create a section from mark to current position). N: create new section starting 10 seconds from current position.

The shortcut layer is designed so you can operate the whole tool without taking your hands off your instrument. The critical ones for real-time use are Space (start/stop), M (mark phrase start), and L (close phrase section).

Every section configuration can be encoded into a URL with the Share button. The URL contains your complete section list — names, times, colors, speeds — and opens into a ready-to-use Multi Looper with the same configuration. This lets you hand a teacher a preconfigured practice session, or sync a routine with a bandmate, without needing accounts.

Multi Looper automatically remembers every video you have opened, along with its sections. The Saved Videos panel on the right side lets you jump back to any previous video instantly. You never lose work because you closed the tab.

Because everything is local, clearing your browser data will delete your saved videos. For important configurations, generate a Share URL and keep it elsewhere.

Multi Looper does not send your loop data to any server. Everything lives in your browser's localStorage. We run standard Google Analytics for aggregate usage reporting, but no personal information or loop content is collected. Read the full privacy policy in the site footer.