Overview

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.

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.

Releases

Captioner.ioInitial

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Initial release

September 2, 2025

Haoran Liang

wrote:

Initial release of Captioner.io.

Haoran Liang

@haoran-liang

Stats

1 tool

Beginner

Joined: August 2025

Pricing

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Free Trial

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$5/month

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Monthly

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Video captions Captioner.io

Video captions

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5.0(2)1

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Reviews

5.0

Average from 2 ratings.

★ ★ ★ ★ ★ 2

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Comments(1)

Chris Studioz

🛠️ 2 tools 🙏 83 karma

Sep 9, 2025

@ initial release

Rated it

This one is CRAAAAAZY! drop your MP4/MOV, it locks captions to speech cleanly (also multi-language), the in-browser editor is solid and you can either export SRT for youtube or burn the subs in shorts with a couple clicks. it's a W for creators :D

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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

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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

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Q&A

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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