Why YouTube Appends “?si=” to Your Links (and How to Remove It)

If you've ever shared a YouTube video from your phone, you may have noticed something unusual at the end of the URL:

https://youtu.be/VIDEO_ID?si=abc123xyz456

That ?si= section looks like random gibberish, but it isn't there by accident. While the video will usually work perfectly without it, many users are curious about what it does and whether it should be removed before sharing.

What Is the “?si=” Parameter?

The ?si= portion of a YouTube URL is known as a query parameter. Query parameters are commonly used to pass additional information along with a web address.

When you share a video from the YouTube mobile app, Google often appends an si parameter to the generated link. The exact internal uses of this parameter are not fully described in public YouTube documentation; treat tracking-related explanations as possibilities, not confirmed technical details.

The si parameter is generally not required for playback. Remove only that named parameter and its value; preserve timestamps, playlist parameters, the video identifier, and any URL fragment. Deleting everything from ?si= onward can remove useful information.

Original link:

https://youtu.be/VIDEO_ID?si=abc123xyz456

Clean link:

https://youtu.be/VIDEO_ID

Does It Track You?

The presence of an si parameter does not automatically mean that personal information is embedded directly within the URL. Its internal use is not fully documented publicly; analytics and attribution explanations should be treated as possibilities, not established facts.

Google has not publicly disclosed every detail about how these identifiers are processed internally. Because of that, claims that the parameter contains personal details such as your name, contacts, or complete social graph should be treated cautiously unless supported by official documentation.

The video can typically be accessed without this parameter. Removing it does not prevent other forms of tracking, and the URL alone cannot establish the parameter’s complete purpose.

Why Some People Remove It

Many privacy-conscious users choose to remove unnecessary URL parameters before sharing links online. While the privacy benefit may vary, there are several reasons people prefer cleaner URLs:

• The video works without the parameter.
• The URL becomes shorter and easier to read.
• Less metadata is included in the shared link.
• Messages and emails look cleaner and more professional.
• It promotes better digital hygiene habits.

How to Remove “?si=” From a YouTube Link

Removing the parameter takes only a few seconds and requires no additional apps or browser extensions.

1. Open the YouTube app.
2. Select the video you want to share.
3. Tap the Share button.
4. Choose Copy Link.
5. Paste the link into a message, email, or notes app.
6. Locate the ?si= section.
7. Remove the si parameter, but keep other useful parameters (such as a video timestamp) if you want them.
8. Share the cleaned URL.

Example:

Before:
https://youtu.be/dQw4w9WgXcQ?si=xyz123abc456

After:
https://youtu.be/dQw4w9WgXcQ

Should You Make This a Habit?

If you value privacy, simplicity, and cleaner communication, removing unnecessary URL parameters is a sensible habit. It won't eliminate all forms of online tracking, but it does reduce the amount of extra information attached to links you share.

After removing the named parameter, check that the link still opens the intended video and preserves any selected start time.

Final Thoughts

The ?si= parameter appears on some shared YouTube links. Its exact internal purpose is not fully documented publicly. While it isn't required for the video to play, many users choose to remove it to keep their URLs cleaner and minimize unnecessary metadata.

When editing a shared link, look for the si query parameter, whether it follows ? or &. Remove that parameter alone and retain the rest of the URL.

Remove only si and preserve the rest of the link

A YouTube share link may contain a query parameter named si. The visible URL does not establish its exact internal purpose; YouTube does not document a stable public contract for its use in every context. It is safer to describe it as a parameter present on some share links rather than assert that it is definitely a source identifier. You can usually open and share the link with the parameter intact.

Do not delete everything from the first question mark: that may remove a timestamp or another useful query value. In ?si=, ? begins the query string. In &si=, the query has already begun and & separates parameters. Remove the named parameter instead.

Before: https://youtu.be/VIDEO_ID?si=EXAMPLE&t=90
After: https://youtu.be/VIDEO_ID?t=90

Before: https://youtu.be/VIDEO_ID?t=90&si=EXAMPLE
After: https://youtu.be/VIDEO_ID?t=90

This JavaScript function removes every si parameter while preserving other query parameters and the URL fragment:

function removeSiParameter(input) {
  const url = new URL(input);
  url.searchParams.delete("si");
  return url.toString();
}

removeSiParameter("https://youtu.be/VIDEO_ID?si=EXAMPLE&t=90");
// https://youtu.be/VIDEO_ID?t=90

removeSiParameter("https://youtu.be/VIDEO_ID?t=90&si=EXAMPLE#comments");
// https://youtu.be/VIDEO_ID?t=90#comments

URLSearchParams.delete removes all matching keys, including duplicates, but does not change the video ID, unrelated query fields, or fragment. The example expects an absolute, valid URL. Verify the final link opens the intended video and timestamp before replacing a published link. For YouTube's general sharing controls, see Share videos and channels.