Add subtitles to any video or movie online. Be it on Netflix, Disney+, Youtube or any other online streaming platform.
- By:
- Gaëtan Covelli
- Daily users:
- 10,086 -222
- Rating:
- 4.27 (132)
- Version:
- 2.8.1 Last updated: 2025-05-09
- Version code:
- 5941736
- Creation date:
- 2016-02-10
- Risk:
- Moderate risk impact Moderate risk likelihood
- Permissions:
- activeTab
- storage
- scripting
- activeTab
- Host permissions:
- <all_urls>
- <all_urls>
- Size:
- 1.61M
- Email:
- su*****@substital.com
- URLs:
- Website ,Privacy policy
- Full description:
- See detailed description
- Source:
- Firefox Browser Add-ons
- Updated:
- 14 hours ago
Ranking
# 759 ▼ 6
Other platforms
User reviews
Pros
- Allows users to add and customize subtitles, including size, color, background, and delay.
- Works effectively across different video content and streaming services.
- Helps users watch foreign language videos by providing subtitles when none are available.
- Easy to use and install, fulfilling its stated purpose.
- Useful for language learners and niche viewing needs.
Cons
- Subtitle synchronization can be inaccurate or off by several seconds.
- Does not support showing subtitles in picture-in-picture mode.
- Progress bar may get stuck and not advance while subtitles and video play correctly.
Recent reviews
extension qui ne sert à rien , à rien du tout , hormis vous enlever les sous titres d'origine , et vous proposer de les remplacer par d'autres que vous n'avez évidemment pas !!!!!!!!!!!
by lo*****, 2025-06-05
Nice!
by Fi*****, 2025-05-24
its doing exactly what it says and i love it but i wish we could favourite subtitles.
by li*****, 2025-05-02
Extension safety
Risk impact
Substital requires a few sensitive permissions. Exercise caution before installing.
Risk impact analysis details
- Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
Risk likelihood
Substital is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.
Risk likelihood analysis details
- Medium This extension was updated in the past 3 months. New updates may not be stable or safe.
- Medium **** ********* *** ****** **** ****** ********* ********** *** *** ** ****** ** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
- Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details
Compare add-ons
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