How to Use

1. Paste a YouTube video URL into the input field above and click "Load"
2. Play the video and click "Mark Current Position" at the start of the section you want to loop
3. Click "Loop to Here" at the end of the section — the loop section is automatically added
4. Create multiple sections and use checkboxes to select which ones to loop
5. Press the play button in the "Loop Playback" section to loop through selected sections in order

Features

• Create and manage multiple loop sections on a single video
• Reorder sections with drag & drop to customize playback order
• Change playback speed (0.25x – 2.0x) with per-section speed settings
• Section transition effects: instant jump or smooth fade
• Gradual speed-up mode: automatically increase speed each cycle for practice
• Settings auto-saved in your browser — pick up right where you left off
• Share your loop settings with others via a share URL
• Japanese / English UI, Dark / Light theme support

Keyboard Shortcuts

Perfect For

• Music Practice — Slow down and repeat difficult phrases and solos
• Language Learning — Replay specific parts of listening materials
• Dance — Break down choreography videos into sections for repetitive practice
• Sports — Analyze form in slow motion at key moments
• Transcription — Listen to musical phrases at different speeds for each section