Promote Sign in Sign up

Video captions

Captioner.io ✓

Add accurate, multilingual subtitles to videos - fast, right in your browser.

Source rating 5.0 (2) 26k views 16 saves 1 comments Free Trial
AI Subtitling Closed Captions Content Accessibility
More categories (4)
Creator Tools Lecture Transcription Multilingual Subtitles Video captions
Visit website Sign in to save

Trial; then from $5/mo

Verdict

A quick read before you dig into the full page.

Best if
Add accurate, multilingual subtitles to videos - fast, right in your browser
Skip if
Watermark on free renders
Pick this when
High accuracy (98% )

Considering RenderCut instead? Compare side by side

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.
Captioner.io website

Best for

Short scenarios where Captioner.io tends to shine.

  • Add accurate, multilingual subtitles to videos - fast, right in your browser.

Example outputs 1

Sample generations and before/after results for Captioner.io.

Captioner.io screenshot
Captioner.io screenshot Captioner.io website

Access & connections

Where you can use Captioner.io.

Platforms

Web

Capabilities

What this tool accepts, produces, and is strongest at.

Input

  • Video

Output

  • Video

Pros & 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
Show 4 more
  • Up to 3 hours per video
  • Unlimited total minutes
  • Creator-friendly editing UI
  • Affordable plans

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

Compare alternatives

Similar tools in the catalog.

Free + from $15/mo

Full comparison

Free + from $15/mo

Full comparison

from $60/mo

Full comparison

Free + from $15/mo

Full comparison

Free

Full comparison

Free + from $9/mo

Full comparison

People also view

Tools that often show up alongside Captioner.io in collections and comparisons.

Releases 1

Initial release September 2, 2025 Current
Initial release of Captioner.io.

Imported reviews 1

5★
2
4★
0
3★
0
2★
0
1★
0
Chris Studioz Sep 9, 2025 v@ initial release

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

FAQ 5

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.
Captioner.io Trial; then from $5/mo
Visit website