YouTube A-B Loop on Two Videos: Compare Musical Sections Precisely

Practice a guitar solo or compare two cover arrangements by looping the same 8 bars on both videos simultaneously. DualTube is the only free tool that offers A-B loop across two synced YouTube videos.

Try it now

Open DualTube→
  1. 1

    Load both videos

    Paste both YouTube URLs into the left and right players.

  2. 2

    Sync the musical downbeat

    Use offset to align the first beat of the section you want to compare. 0.1s precision is enough for most music.

  3. 3

    Mark point A

    Scrub to the start of the section (e.g., beginning of the chorus) and click "Set A".

  4. 4

    Mark point B

    Scrub to the end of the section (e.g., end of the chorus) and click "Set B". Both videos will now loop this exact range.

  5. 5

    Switch audio between sides

    Use the audio balance slider to A/B compare: left-only, right-only, or mixed. Perfect for tone and arrangement analysis.

Frequently Asked Questions

How precise is the loop?▾

A-B loop points are accurate to ~0.1s. For tighter musical alignment, adjust the offset slider in 0.1s steps.

Can I loop a 2-second section?▾

Yes. There is no minimum duration — you can loop as short as a single drum hit.

Does the loop persist across share URLs?▾

Yes. The A-B loop points are encoded in the shareable URL along with offset and video IDs.

Related use cases

Cover vs Original: A/B Listening Setup for Music Fans

The fastest way to compare a YouTube cover with the original song. Sync the downbeat, switch audio between L and R, loop the chorus — all in one page.

Related Guides

How to Compare Two YouTube Videos Side by Side

Learn how to compare two YouTube videos side by side using DualTube. Perfect for comparing covers with originals, tutorials, and multi-angle views.

How to Sync Two YouTube Videos Together

Step-by-step guide to synchronize two YouTube videos with precise offset control using DualTube.

How to Compare Music Covers with Original Songs on YouTube

Use DualTube to compare music covers with their original songs. Listen side by side with audio balance control.

How to Mirror a YouTube Dance Video for Practice (Side by Side with Yourself)

Learn K-pop, TikTok, or hip-hop choreography faster. Watch the instructor video next to your webcam in real time, loop tricky sections, and slow down the tempo — all in the browser.

How to Compare Your Golf Swing with a Pro Side by Side (Free)

Stop paying for video analysis apps. Load a pro tour swing and your own recorded swing side by side in DualTube — with sync playback, offset control, A-B loop and webcam input.

How to Set Up a Reaction Video View with Two YouTube Videos in Sync

Watch a reactor and the source video in perfect sync. Load both into DualTube, align the moments, and never scrub back to see what the reactor was reacting to.

← Back to top