How to Add Auto Captions to TikTok/Reels/Shorts for Free

Why Captions Matter for Short-Form Video

85% of Facebook and Instagram videos are watched without sound. On TikTok, captioned videos see 40% more watch time on average. Captions are not optional for short-form content — they are essential for reach, engagement, and accessibility.

MiOffice Auto Captions uses Whisper AI on GPU servers to transcribe your audio and burn styled captions directly into the video. No watermark, no account, no subscription.

How to Add Auto Captions with MiOffice

1. 1

   Record or Upload Your Video

   Record your TikTok, Reel, or Short, then go to the Auto Captions tool. Upload MP4, MOV, WebM, or AVI.

2. 2

   AI Transcribes Your Audio

   Whisper AI processes your audio on GPU servers, generating accurate word-level timestamps. Files are deleted immediately after processing.

3. 3

   Customize Font and Position

   Choose font size and position (top or bottom). Place captions at the bottom third for TikTok or top for Reels — whatever fits your style.

4. 4

   Download and Post

   Download your captioned video as MP4 — no watermark. Upload directly to TikTok, Instagram, YouTube, or any platform.

MiOffice vs CapCut vs Kapwing vs Veed.io

Platform-Specific Sizing

Privacy & Security

• --Processed on secure GPU servers. Your videos are processed on dedicated GPU infrastructure and never stored permanently.
• --Deleted immediately after processing. Video files are purged from server memory as soon as you download the captioned result.
• --No content analysis. We do not review, categorize, or use your video content for any purpose beyond caption generation.
• --Encrypted transfer. All uploads and downloads use HTTPS/TLS encryption.