Skip to main content
Whisper Web
Free Creator Tool

Free Social Media Captioning — Auto-Generate Captions

Generate accurate captions for your Reels, TikToks, and Shorts in seconds. Export as SRT or VTT for any platform. Everything runs in your browser — your unreleased content stays private.

Loading audio engine…

Built for Content Creators

Platform-Ready Subtitles

Export SRT files that work directly with Instagram, TikTok, YouTube, Facebook, LinkedIn, and Twitter/X. Upload the subtitle file and captions appear perfectly synced with your video.

Captions in Seconds

A 60-second Reel or TikTok transcribes in under 15 seconds with WebGPU. Batch-process your entire content queue in minutes instead of typing captions manually for hours.

Unreleased Content Stays Private

Your videos never leave your device. Caption tomorrow's content today without worrying about leaks — no cloud upload means no risk of your pre-launch content appearing elsewhere.

Caption in 100+ Languages

Create captions for content in any language. Reach global audiences on TikTok, caption your Spanish Reels, or add subtitles to your Korean YouTube Shorts.

Precise Timing for Short-Form

Whisper's word-level timestamps mean captions sync precisely with fast cuts, transitions, and rapid speech — essential for the quick pace of short-form content.

Edit-Friendly Export

Export as SRT for platform upload, VTT for web players, or TXT for caption text you can style in your video editor (CapCut, Premiere, DaVinci Resolve).

How to Caption Your Content

1

Open Whisper Web

No account, no subscription, no app to download. Just open whisperweb.dev in your browser. Free for unlimited use.

2

Upload Your Video or Audio

Drag and drop your video file (MP4, MOV, WebM) or extracted audio. Works with content from any camera, phone, or editing software.

3

Get Synced Captions

Whisper generates timestamped captions locally on your device. Review and edit any words that need correction.

4

Export & Upload

Download as SRT for Instagram/TikTok/YouTube, or VTT for your website. Upload the subtitle file alongside your video on any platform.

Perfect For

Adding captions to Instagram Reels for 40% more watch time
Generating TikTok subtitles to boost engagement and accessibility
Creating YouTube Shorts captions for better SEO and discoverability
Batch-captioning a week's content in one sitting
Making LinkedIn video posts accessible to scrollers with sound off
Adding multilingual subtitles to reach international audiences
Improving accessibility for deaf and hard-of-hearing followers

Frequently Asked Questions

How do I add SRT captions to Instagram Reels?
Export the transcript as SRT from Whisper Web, then import the SRT file into your video editor (CapCut, Premiere, etc.) to burn in captions. Alternatively, some platforms like YouTube and Facebook let you upload SRT files directly as subtitle tracks.
Does it work with TikTok's caption format?
Yes. Export as SRT and import into CapCut (TikTok's official editor) or any video editor to add styled captions. TikTok also has a native auto-caption feature, but Whisper Web gives you more control, works offline, and keeps your content private.
How accurate are captions for fast-talking content?
Whisper handles rapid speech well — it was trained on diverse audio including fast speakers. For very quick dialogue with heavy slang or brand names, plan on a quick review pass. A 60-second clip usually only needs 1-2 edits.
Can I caption content with background music?
Yes, Whisper is robust against background music. For best results, keep music at a level where speech is clearly audible (as you would for your audience anyway). Heavily music-mixed content where vocals compete with beats may have reduced accuracy.
Is there a limit on how many videos I can caption?
No limits at all. Caption 5 videos or 500 — there are no daily caps, no per-minute charges, and no freemium restrictions. Since the AI runs on your device, there are no server costs to limit usage.
Does my content get uploaded to any server?
No. Your videos and audio stay entirely on your device. This is especially important for creators working with unreleased content, brand partnerships under NDA, or content scheduled for specific launch dates. Zero risk of premature exposure.

Caption Your Content — Free

No signup. No upload. No data collection. Just open your browser and go.

Start Captioning