Substital

Add subtitles to any video or movie online. Be it on Netflix, Disney+, Youtube or any other online streaming platform.
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Substital is a versatile Chrome extension designed to enhance your video streaming experience by allowing you to add subtitles to virtually any online video or movie. Whether you're watching content on Netflix, Disney+, Amazon Prime Video, YouTube, Vimeo, or other platforms, Substital bridges language gaps for entertainment, language learners, and accessibility for the Deaf or Hard-of-Hearing.

Key features include built-in subtitle search, support for popular video platforms, customizable subtitle appearance, manual synchronization, and drag-and-drop functionality for your own subtitle files in SubRip (.SRT) format. Its user-friendly interface keeps it passive by default, only activating subtitle injection when you choose. Substital is free, ad-free, and constantly updated to ensure compatibility with streaming services, making it an essential tool for anyone seeking enhanced viewing with subtitles.

Manifest V3 Add-on Accessibility Productivity Entertainment
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
Host permissions:
  • <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 rankings
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Other platforms

Substital: Add subtitles to videos and movies (v2.8.1)
300,000 4.34 (2,890)
Substital: Add subtitles to videos and movies (v2.7.0)
25,584 4.50 (36)

User reviews

Substital is a user-friendly Firefox add-on that allows adding and customizing subtitles on videos, aiding foreign language viewing and learning. Users appreciate its functionality across various platforms and ease of use. However, common issues include subtitle synchronization inaccuracies, lack of subtitle display in picture-in-picture windows, and occasional progress bar glitches. Despite these drawbacks, it is considered a valuable tool for those needing added subtitles.
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
View all user reviews ›

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

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