- Next-Gen AI Captioning
Auto Caption Generator for any Video
An auto caption generator uses AI speech recognition to detect spoken audio and instantly add timed, on-screen text to a video — no manual typing required. vSubtitle produces word-by-word captions with editable timing, custom styling, and one-click export.
- 50K+ minutes processed
- Up to 97% accuracy
- No credit card required
What Is an Auto Caption Generator?
An auto caption generator is software that converts spoken audio in a video into readable, time-synced on-screen text automatically, using AI speech-to-text instead of manual transcription. It times each line to the audio and can flag non-speech sounds like [music] or [laughter] for accessibility.
Word-by-word captions
An editable transcript so you can fix a name or brand term in seconds.
Fast 3-step flow
Upload → Auto-Caption → Export. Minutes, not hours.
Built for every format
Social clips, webinars, training, and long-form content alike.
Captions vs. Subtitles: What's the Difference?
Captions are in the same language as the audio and include non-speech sounds for viewers who are deaf, hard of hearing, or watching on mute. Subtitles are usually translated dialogue for viewers who don’t speak the original language and assume they can hear the audio.
| CAPTIONS | SUBTITLES | |
|---|---|---|
| Language | Same as spoken audio | Often translated |
| Sound cues | Yes — [music], [laughter], speaker labels | No |
| Primary use | Accessibility, sound-off social viewing | International, multilingual audiences |
| Compliance | Supports ADA / WCAG | N/A |
Why Add Captions to Your Videos?
Most social video is watched with the sound off, and captions are the single biggest factor in whether a viewer keeps watching past the first few seconds. Captions also make content accessible and are often a legal requirement for education and enterprise content.
↑ Watch time
On muted, mobile-first feeds like Reels, TikTok, and Shorts.
ADA / WCAG
Meets accessibility requirements for education and enterprise.
↑ Comprehension
Helps non-native speakers and viewers in loud environments.
SEO
Gives search engines indexable text tied to your video.
How the Auto Caption Generator Works
Three steps, timed like the captions themselves.
Upload your video
Drag and drop your file, then select the spoken language and region for best accuracy.
Auto-generate captions
AI transcribes the audio into word-by-word captions and an editable transcript. Adjust text, timing, and reading speed.
Style and export
Apply fonts, colors, and brand presets, then export burned-in video or SRT/VTT/TXT.
Style, Brand, and Publish Captions Anywhere
Custom styling & branding
Match fonts, sizes, colors, and backgrounds to your brand, with distinct styles per speaker or language.
Closed captions & accessibility
Add [music], [laughter], and speaker labels — high-contrast presets built for social feeds and e-learning.
Multi-format export
Export as SRT, VTT, TXT, DFXP and more in one click. Import existing files to restyle or fix timing.
Professional QC controls
Enforce CPS, line length, and title-safe area. Batch-shift timestamps and flag likely errors.
Team collaboration
Role-based permissions, shared review links, and enterprise-grade cloud security.
100+ language translation
Translate captions while keeping timing and style presets intact.
AI Captioning in 100+ languages
- FAQs
Frequently Asked Questions
If you don’t see an answer to your question, you can send us an email from our contact form
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vSubtitle’s speech-to-text engine delivers up to 97% accuracy, though results vary with audio quality, accents, and background noise. Every caption set includes an editable transcript so you can quickly fix names, brand terms, or misheard words before publishing.
You can export captions as SRT, VTT, or TXT on the free plan, with Pro tiers adding SCC, STL, SBV, CAP, and XML for broadcast and enterprise workflows. Existing SRT/VTT files can also be imported for restyling or timing fixes.
Yes. You can style captions with your brand’s fonts and colors and export them burned into the video file, or export as a separate caption file (SRT/VTT) to upload alongside your video on platforms like YouTube or LinkedIn.
Captions are same-language on-screen text that includes non-speech sounds like [music] and [laughter], built primarily for accessibility and sound-off viewing. Subtitles are typically translated dialogue for audiences who don’t speak the video’s original language.
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Use batch shift to move all captions earlier or later when there’s a constant delay, then nudge individual lines on the timeline for local fixes. CPS and reading-speed guidance help prevent text from feeling crowded or drifting out of sync on longer videos.
Get started
Ready to Caption Your Next Video?
Create accurate, styled, accessible captions in seconds — free to start, no credit card required.