What is Substital?
Substital is a free browser extension that lets you add subtitles to any YouTube video. You can:
- Upload any subtitles file (.SRT format) to any YouTube video
- Adjust timing if subtitles are out of sync
- Change subtitle size and color
Instructions for Chrome
Go to the Chrome Web Store:
chrome.google.com/webstore/detail/substitalClick the blue "Add to Chrome" button
Click "Add extension" when the pop-up appears
Pin the extension (recommended): Click the puzzle piece icon in the top-right corner, then click the pin icon next to Substital
Instructions for Firefox
Go to Firefox Add-ons:
addons.mozilla.org/firefox/addon/substitalClick the blue "Add to Firefox" button
Click "Add" when the permission pop-up appears
Pin the extension (recommended): Right-click the Substital icon and select "Pin to Toolbar"
Instructions for Edge
Go to the Edge Add-ons Store:
microsoftedge.microsoft.com/addons/.../substitalClick the blue "Get" button
Click "Add extension" when the pop-up appears
Pin the extension (recommended): Click the puzzle piece icon in the top-right corner, then click the eye icon next to Substital
How to Use Substital
Once installed, follow these steps for any YouTube video
Go to a YouTube video you want to watch
Click the Substital icon in your browser toolbar (top-right corner)
Click the video link that appears in the pop-up
Drag and drop your .SRT subtitle file into the pop-up window (or click the upload button to browse for it)
If Subtitles Are Out of Sync
Sometimes subtitles appear too early or too late. Here's how to fix it:
Look for the Substital button that appears at the bottom of the YouTube video player (after adding subtitles)
Click it to open the settings
Use the sync slider to adjust timing:
- Slide left (negative) if subtitles appear too early
- Slide right (positive) if subtitles appear too late
Customizing Subtitles
You can change how subtitles look from the same Substital button at the bottom of the video player:
- Font size (make text bigger or smaller)
- Text color
- Background color
Need More Help?
Visit the official Substital website for more information:
substital.com/getting-started