How To
How to Add Captions to Video
Upload, transcribe, style, and export — captions added to your video in under 3 minutes.
Step-by-Step Instructions
- 1
Upload your video file
Drag and drop your video into VideoCaptions.AI. The tool accepts MP4, MOV, WebM, and other common video formats. Your file stays in your browser — nothing is uploaded to a server.
Tip: Trim your video to the relevant section before uploading for faster transcription and a cleaner editing experience.
- 2
Whisper AI transcribes your audio
The tool extracts audio from your video and runs Whisper AI locally in your browser. You get word-level timestamps for every spoken word. Choose between speed-optimized and accuracy-optimized Whisper models.
- 3
Style your captions
Choose from 13 animation effects including fade, bounce, glitch, karaoke, and typewriter. Pick a font, set colors, adjust caption position with drag-and-drop. See changes in the live preview instantly.
Tip: Start with the flash category and scale-up effect for bold social media captions. Switch to karaoke for longer, dialogue-heavy content.
- 4
Export your captioned video
Hit export and choose your resolution — from quick preview to 4K. The tool renders an MP4 with captions burned in. The file downloads automatically with no watermark and no branding.
01
Why Add Captions to Your Videos?
Adding captions to videos has shifted from an accessibility nice-to-have to a content strategy essential. The data is clear: captioned videos earn more watch time, more engagement, and more shares across every social platform. According to Meta for Business (2019), captioned video ads increase view time by 12%. On Instagram, 40% of Stories are watched without sound (Instagram internal data). TikTok's own creator guidelines recommend captions for maximum reach. Beyond social media metrics, captions make your content accessible to the 466 million people worldwide with hearing loss (World Health Organization), to viewers watching in noisy environments, and to non-native speakers who rely on text to follow along. Search engines also benefit from caption text — Google and YouTube index spoken content in captions, improving your video's discoverability. Whether you create content for marketing, education, entertainment, or personal sharing, captions make it better.
02
What Makes VideoCaptions.AI Different
Most caption tools either require a cloud upload — raising privacy concerns and adding latency — or produce basic SRT files that give you no visual control. VideoCaptions.AI takes a different approach. Everything runs in your browser. Whisper WASM transcribes your audio locally, so your video never touches a server. The visual editor lets you drag captions, adjust timing, change fonts and colors, and preview 13 animation effects in real time. When you export, the tool renders an MP4 with captions composited directly into the video frames using Remotion. The result is a broadcast-quality captioned video that plays correctly on any platform without depending on external subtitle files or platform-specific caption rendering. There are no watermarks, no signup walls, and no premium tiers. The tool is free because it runs on your hardware, not ours. This offline-first architecture means you get professional results with zero privacy compromise.
Frequently Asked Questions
Everything you need to know before you start.
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Yes. VideoCaptions.AI is completely free. Exported videos have no watermark, no branding, and no visual artifacts. There is no premium tier or paid upgrade. The tool runs entirely in your browser, so there are no server costs to offset with subscription fees.
No. You can start captioning immediately without signing up, creating an account, or providing an email address. Your projects are saved locally in your browser's storage. No personal information is collected or required at any step.
MP4, MOV, WebM, and most common video formats are supported. The tool uses your browser's native media decoders, so any format your browser can play can be captioned. Audio-only formats like MP3 and WAV are also accepted.
Yes. After Whisper transcribes your video, you have full editorial control. Edit any word, fix typos, remove filler words, split or merge word groups, and adjust timing. Changes are reflected in the live preview immediately so you can see exactly how your edits look.