Add Captions to Lecture Video
CentClip automatically transcribes and captions your lecture recordings so students can follow along, search the content, and watch without audio. Upload once, download captions in the format your LMS or hosting platform requires.
Drop your file here
MP4 · MOV · MP3 · WAV · WebM · MKV and more
5 free minutes · no account needed · no watermark
How to add captions to lecture video
- 1
Upload your lecture video
Drag your lecture file onto the CentClip upload area - MP4, MOV, and other common formats are accepted. No account is required to get started, and your first 5 minutes are free. Processing begins immediately after the upload completes.
- 2
Review and correct the transcript
CentClip generates a time-coded transcript you can read through before exporting. Click any line to correct a word or fix a speaker name, technical term, or course-specific vocabulary. Edits update the captions in sync, so you do not need to touch the timing separately.
- 3
Download captions or a captioned video
Choose your output: a burned-in MP4 with captions baked into the video, a plain SRT file, a VTT file for web players and LMS platforms, or a plain text transcript. All formats are generated from the same corrected transcript, so you only do the review work once.
Why choose CentClip?
Handles technical and academic vocabulary without manual pre-training
Lecture audio is full of subject-specific terms - gene names, legal citations, software commands, mathematical notation read aloud - that trip up generic transcription services. CentClip's speech model handles mixed vocabulary well enough that most instructors spend only a few minutes on corrections rather than re-typing whole sentences. That time saving compounds fast when you have a full semester of recordings to caption.
Pay only for the minutes you actually caption
A 45-minute guest lecture costs $2.25. A full 16-week course of 90-minute sessions costs $72. There is no monthly seat fee eating into your department budget between semesters, and credits never expire, so you can buy a block in the fall and use the remainder in the spring. This makes CentClip practical for adjuncts, independent tutors, and small departments that caption sporadically.
Outputs match what your video platform or LMS actually accepts
Canvas, Moodle, Panopto, YouTube, and Vimeo all accept SRT or VTT caption files that you upload separately from the video. Kaltura and some institutional platforms prefer burned-in captions. CentClip gives you all three from a single upload so you are not re-processing the video when the platform requirements turn out to be different from what you expected.
FAQ
How accurate are the captions on a typical lecture recording?
Accuracy depends on audio quality and microphone placement, but clear recordings with a lapel or headset mic typically come back with fewer than five errors per minute. Lecture-hall audio with distant microphones may need more corrections, especially for proper nouns and course-specific terms.
How much does it cost to caption a lecture video?
Your first 5 minutes are free with no account required. After that, captioning costs 5 cents per minute - a 60-minute lecture is $3.00. There is no subscription, and unused credits never expire.
What video formats and caption file types does CentClip support?
CentClip accepts common video formats including MP4 and MOV for upload. You can export captions as a burned-in MP4, an SRT file, a VTT file, or a plain text transcript - the formats accepted by most LMS platforms and video hosts.
Do my purchased credits expire if I do not use them right away?
Credits never expire. You can buy a block at the start of the semester, caption a few lectures, and use the remaining credits months later without any penalty or renewal requirement.