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Captioner.io—Add accurate, multilingual subtitles to videos - fast, right in your browser.
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Captioner.io
Inputs:
Outputs:
Add accurate, multilingual subtitles to videos - fast, right in your browser.
Most popular alternative: Freesubtitles (144 saves)
Author
Captioner is a browser-based subtitle platform built for creators who care about accuracy. Upload an MP4 or MOV and get highly accurate speech-to-text in 98+ languages, with timestamps aligned for video, not just raw transcripts. Word-level timing and precise line breaks mean minimal cleanup and a smoother editing flow.
Haoran Liang
🛠️ 1 tool
It’s designed to slot into real creator workflows. Import an existing transcript and auto-sync it to your video (think YouTube auto-sync, but tighter), then refine everything in an editor made specifically for subtitles. When you’re done, export SRT, VTT, or SBV for your editor—or burn captions directly into the video in your chosen style up to 4K.
Captioner also supports quick translation (currently English → Mandarin Chinese in Express) and long videos up to 3 hours per file, with unlimited total minutes. It optimizes for accuracy over raw speed, so you spend less time fixing mistakes and more time publishing.
Show more
Releases
Get notified when a new version of Captioner.io is released
Notify me
September 2, 2025
Haoran Liang
Initial release of Captioner.io.
Pricing
Pricing model
Free Trial
Paid options from
$5/month
Billing frequency
Monthly
Prompts & Results
Add your own prompts and outputs to help others understand how to use this AI.
Captioner.io was manually vetted by our editorial team and was first featured on September 2nd 2025.
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833,287635v1.6 released 14d agoFree + from $12/mo
Reducing manual efforts in first-pass during code-review process helps speed up the "final check" before merging PRs -
28,778393v1.0 released 11mo agoFree + from $35/mo
This team took the time to understand the industry, problem and its users and designed a perfectly engineered solution. Kudos.
Pros and Cons
Pros
High accuracy (98% )
Supports 98 languages
Word-level timestamps
Precise subtitle alignment
Import and auto-sync transcripts
SRT, VTT, SBV export
Burn-in subtitle video export
Browser-based, no install
Up to 3 hours per video
Unlimited total minutes
Creator-friendly editing UI
Affordable plans
View 7 more pros
Cons
Translation options are limited
MP4/MOV uploads only
2GB file size cap
Not the fastest transcriber
Watermark on free renders
Advanced edits require Unlimited plan
View 1 more cons
7 alternatives to Captioner.io for Video captions
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Free AI subtitles for your videos and audio.10,708144Released 2y agoFree + from $10 -
Add English subtitles to any language video instantly8,22850v1 released 2y agoFree + from $10.00/moSupertranslate est un outil basé sur l'IA qui permet aux utilisateurs d'ajouter automatiquement des sous-titres anglais aux vidéos dans n'importe quelle langue. Il est alimenté par Whisper d'OpenAI, le moteur de synthèse vocale le plus précis au monde. Le processus est simple et direct : les utilisateurs peuvent télécharger une vidéo dans n'importe quelle langue sur la plateforme, générer des sous-titres, puis télécharger le fichier .srt ou .vtt. La plateforme dispose également d'un éditeur de sous-titres intuitif qui permet aux utilisateurs de diviser, fusionner et ajuster les codes temporels des sous-titres générés. Supertranslate est gratuit, sans carte de crédit requise et peut être annulé à tout moment. -
AI-powered video localization and dubbing made easy7,13455Released 2y agoFrom $60/mo -
Generate subtitles for videos with AI in one click.5,79237Released 2y agoFree + from $15/moIt doesn't create the subtitles and it doesn't let you upload them. You can only create them manually -
Generate precise video subtitles effortlessly online.5,06935Released 2y agoFree + from $10 -
Add stylish subtitles to short videos instantly.4,05144Released 7mo agoFree + from $15/moAmazing tool! Just started working on my videos and I’m loving everything RenderCut offers. It’s super easy to use and saves me a ton of time with subtitles. 5 tacos, no doubt! -
AI-powered captions for viral TikTok videos4,00229Released 2y agoNo pricingtried submagic and it does the job, auto captions came out clean and it’s super easy to use. free trial lets you upload 3 vids which is enough to test it out, but the watermark on them means you can’t really use those exports anywhere. still, pretty solid tool overall :p
View 22 more alternatives
Q&A
How accurate is Captioner, and why does that matter for video?
How accurate is Captioner, and why does that matter for video?
What’s the difference between Express and Unlimited plans?
Express is for quick turnaround: fast subtitling, lightweight edits, and translation from English to Mandarin Chinese. Unlimited adds the Pro editor for deeper timing/text control, longer videos (up to 3 hours), priority rendering, and full export flexibility.
Which formats can I export, and can I burn in captions?
Export standard SRT, VTT, and SBV for use in YouTube and NLEs. You can also render a video with open captions (burned in) directly from the editor, including style choices and up to 4K output.
What are the upload limits and supported files?
Videos can be up to 3 hours per file, with a current size cap of 2GB. MP4 is recommended for best results; MOV is supported as well. For larger sources, compress or proxy first, then export captions for final renders elsewhere.
Which languages are supported for transcription and translation?
Transcription covers 98+ languages, with strongest accuracy in widely used languages. Translation in Express currently supports English → Mandarin Chinese, with additional language pairs planned.
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If you liked Captioner.io
Featured matches
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83,316298v2.0 released 1mo agoFree + from $13.50/mo
Generating captions was super fast like seconds. Wish they had Anton font though
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7,45188Released 1y agoFrom $39
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Powerful speech-to-text tool for video captions, subtitles and audio transcription.Open18,435107Released 1y agoFree + from $9.99/moGreat product, very useful for captioning a large volume of influencer videos at work, highly accurate transcription tool, would recommend.
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