The lightweight dual subtitle extension. No flashcards, no dictionaries, no grammar machinery — and we merge the official subtitle tracks whenever they exist, so your subtitles keep the jokes the studio wrote.
One job: two subtitle lines. Pick your languages, click ON, watch.
Official studio tracks merged when they exist. AI translation only when they do not.
Netflix to Jellyfin to Coursera — and virtually any HTML5 player.
Native Support
These six switch on by themselves. Every other site with a video player works too: turn its own subtitles on once and EasyDualSub takes over. Still stuck on a site? Send us the link and we add it.
Three convictions — and one thing we deliberately left out.
Our Difference
Merge native tracks when possible. Translate when necessary.
AI translation flattens jokes, idioms and cultural references. When the platform already ships two official tracks, we pair them line by line instead — so you read what the studio actually wrote.
Track 2, two ways: merge an official track, or translate when none exists.
Zero Configuration
No account to create, nothing to configure, no tutorial. Pin it, pick two languages, press play — that is the whole setup.
No language course attached
No flashcards, no SRS decks, no pop-up dictionary, no grammar analyzer — and no $5-$10/mo suite price for features you will never open.
Click, pick two languages, play. Nothing else to do.
Any Website
Language Reactor is locked to Netflix and YouTube. Six platforms are fully automatic here — and everywhere else, from MangoTV to Jellyfin to your company portal, the extension detects the player and adapts.
Fully automatic on
Works on any site with a video player — these four are just examples. If yours is not one of them, tell us and we make it work.
When You Want It
Sensible defaults, every knob available. Including hiding the primary subtitle entirely, which turns EasyDualSub into a plain video translator.
One screen for every setting, with a live preview at the bottom.
Fits Any Player
Player controls slide in over the bottom of the picture — exactly where subtitles live. EasyDualSub notices and lifts both lines out of the way, then puts them back. Windowed or full screen, the text stays readable and nothing ever sits under the progress bar.
Who Uses It
Two subtitle lines solve more problems than one.
Comprehensible input, the practical way: the target language on top, your own language underneath as a safety net you only read when you need it.
Movie night stops being a negotiation. Both languages on screen at once — nobody has to watch in a language they are still working on.
Follow local shows and regional news while keeping an accurate translation in your mother tongue right below the line.
Pair the closed captions track with a translated one, and read both at the same time on any site.
Real Store Reviews
Every quote below is a real review on the Chrome or Firefox store. Follow the link on any card to read it there.
“Fantastic!! You have no idea how many hours I spent fixing the stupid Disney+ subtitle style. Now I even enjoy the shows with dual subtitles!”
“For me, right now the best solution for dual subs with AI translation. It seamlessly integrates without any weird UI and is super easy to use. Perfect if you want to watch shows together with friends who have a different native language. Pricing is also fair.”
“A fantastic tool for language learners — having dual subtitles makes it much easier to follow along and pick up new vocabulary naturally. It works smoothly and really enhances the video-watching experience.”
“I love this extension, it's pretty useful :)”
“Great app for learning languages”
Using EasyDualSub? A review on your store genuinely helps us keep it maintained.
Honest Comparison
Free tools exist, and so do expensive ones. Here is exactly what you trade away with each.
Language Reactor, Trancy, Migaku
Paid in hours of troubleshooting
For one feature out of twenty
Or pay once, lifetime
Free costs you evenings. Suites cost you five times more for one feature. We cost about a coffee.
Fair Freemium
YouTube is free forever. Everywhere else you get a monthly allowance — and when it runs out we do not slam the door.
Every YouTube video, unlimited, forever. It never touches your monthly quota — with or without an account.
Always 100% free
5 free videos per month straight after install, on every premium platform. Create a free account and it doubles to 10. Resets automatically each month.
Free account: 5 becomes 10 a month
Out of quota? You are not cut off. The extension keeps working on every video across the web — dual subtitles simply stop after the first 15 minutes.
First 15 min of any video, any site
No trial to remember to cancel, because there is nothing to cancel: the free tier simply stays free for as long as you want to test it.
No credit card required
Streaming platforms rewrite their players constantly. Premium is what pays for keeping up with them — so the extension still works next month, and the month after.
Around €2 a month for an extension that is actively maintained — against free scripts that break on the next platform update, and $5-$10 suites you only wanted one feature from.
No credit card, no expiry
For casual viewers and anyone who mostly watches YouTube
Works in Chrome, Firefox and Edge
Billed €23.99/year
Unlimited dual subtitles, everywhere, on every site
Cancel anytime. Secure payment via Stripe.
We understand — another €2 line on the statement every month. Take the Lifetime license instead: one payment, yours forever, no recurring charge ever again.
Netflix, Disney+ and Max change their players without warning, and every change can break subtitle extraction. Free scripts die there. Your subscription is what funds the fixes — usually before you notice anything broke.
The things people actually ask us before installing.
Install it, pick your two languages, press play. That is genuinely the whole setup.
