What is Add Subtitles?

Add Subtitles focuses on adding subtitles to online HTML5 videos that do not provide them natively. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Add Subtitles?

Add Subtitles is an open-source project built for firefox users who need subtitles for web videos.

Is Add Subtitles free?

Yes — Add Subtitles is open source under the Open Source license and free to use.

What platforms does Add Subtitles run on?

Add Subtitles runs on the web and embeddable surfaces.

Is Add Subtitles still active?

Unverified. Add Subtitles has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to Add Subtitles?

Similar projects tracked by PulseGate include +Sub, Subtitle Finder, and Subs Translate.

Who develops Add Subtitles?

Add Subtitles is developed by imadr.

When did Add Subtitles launch?

Add Subtitles first shipped in 2019.

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Add Subtitles

Name: Add Subtitles
Author: imadr

github.comBrowser DevTools & extensions

Add Subtitles is an open-source Firefox extension that lets users attach subtitle files to HTML5 video elements on websites. It is intended for viewers who need captions or subtitles when a video player does not offer them.

Open SourceWebEmbeddable

Visit github.com

Overview

4 features

Add Subtitles sits in PulseGate's Browser DevTools & extensions category. It focuses on adding subtitles to online HTML5 videos that do not provide them natively. Add Subtitles is an open-source project aimed at firefox users who need subtitles for web videos. The project is open source (Open Source). It ships for the web and embeddable surfaces.

imadr builds and maintains Add Subtitles, and it first shipped in 2019. Key capabilities include subtitle file loading, HTML5 video support, and subtitle overlay.

Summary written by a language model from the project’s public pages.

Subtitle file loading
HTML5 video support
Subtitle overlay
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 08:25 UTC
Add Subtitles verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Add Subtitles

What is Add Subtitles?: Add Subtitles focuses on adding subtitles to online HTML5 videos that do not provide them natively. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Add Subtitles?: Add Subtitles is an open-source project built for firefox users who need subtitles for web videos.
Is Add Subtitles free?: Yes — Add Subtitles is open source under the Open Source license and free to use.
What platforms does Add Subtitles run on?: Add Subtitles runs on the web and embeddable surfaces.
Is Add Subtitles still active?: Unverified. Add Subtitles has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to Add Subtitles?: Similar projects tracked by PulseGate include +Sub, Subtitle Finder, and Subs Translate.+Sub Subtitle Finder Subs Translate
Who develops Add Subtitles?: Add Subtitles is developed by imadr.
When did Add Subtitles launch?: Add Subtitles first shipped in 2019.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
First seen: 8 Sept 2026
Built for: Firefox users who need subtitles for web videos
Model: Open source
Solves: Adding subtitles to online HTML5 videos that do not provide them natively.

Registered as

Firefox Add-ons: add-subtitles

Developer

imadr

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 8 Sept 2026

Identity audit (13)

Slug: add-subtitles-github-com
Lifecycle state recorded: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 8 Sept 2026
Canonical URL: https://github.com/imadr/add-subtitles

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