Reaction Video Caption Generator
Reaction video caption generator: upload your reaction and the spoken words become animated captions, timed to each word and kept clear of the clip you react to.
Create an account to generate and export your captions.
Your commentary needs visibility
In a reaction video you talk over a clip. Viewers often watch without sound, so captions let them follow your thoughts. The captions appear as you speak, word by word, so the timing feels natural.
Common caption oversights
Putting captions at the bottom where the reaction clip’s subtitles sit.
Place captions at the top or center so they don’t cover the original video.
Using a font color that blends with the clip’s background.
Choose a contrast color that stands out from the footage.
Leaving long sentences on one line.
Reduce words per line so each burst reads quickly.
Styles that fit reaction moments
Mozi
Beast
Highlight Words
Word Pop
Add captions in four steps
Upload your video
Drop an MP4, MOV or WebM. The audio of your reaction is transcribed automatically.
Pick a style and position
Select a template and choose top, center or bottom. Keep the captions away from the clip you’re reacting to.
Edit any errors
Click a word in the transcript, type the correct spelling, and the timing stays.
Export the result
Export an MP4 with the captions burned in and share it wherever you post.
Before you post your reaction
- Captions sit clear of the clip you react to
- Font color contrasts with the video background
- Words per line are short enough to read fast
- Spelling of names and references is correct
- Exported video plays with captions on all devices
What Sycamore offers
Word‑level timing
Captions follow each spoken word without manual syncing
15 animation styles
Choose from Mozi, Beast, Word Pop and more
Simple positioning
Top, center or bottom placement only
Edit on the fly
Click any word to fix it, timing stays
Export ready MP4
Captions are burned in, no subtitle file needed
Manual captions vs Sycamore
Doing it by hand takes hours; Sycamore does it in minutes.
Timing
- Hand edit
- Manual keyframes
- Sycamore
- Word‑level auto
Style options
- Hand edit
- Limited fonts
- Sycamore
- 15 animated templates
Export format
- Hand edit
- Separate SRT file
- Sycamore
- MP4 with captions
| Hand edit | Sycamore | |
|---|---|---|
| Timing | Manual keyframes | Word‑level auto |
| Style options | Limited fonts | 15 animated templates |
| Export format | Separate SRT file | MP4 with captions |
Calculate your speaking time
The Speaking Time Calculator shows how long your commentary runs so you can plan caption length.
Caption your next reaction
Frequently
Asked Questions
How do I add captions to a reaction video?
Upload the video to Sycamore, pick a template, edit any misheard words, and export the MP4 with captions burned in.
Can I keep captions away from the clip I’m reacting to?
Yes. You choose top, center or bottom placement, so the captions stay clear of the source footage.
What if a word is transcribed wrong?
Click the word in the transcript, type the correct spelling, and the timing remains unchanged.
Does it work with square or vertical videos?
Yes. Sycamore supports 9:16, 16:9 and 1:1 formats, so your reaction video stays intact.
Is there a limit on how long my video can be?
The free plan lets you caption up to 10 minutes on sign‑up. Paid plans start at $19 a month.