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How to Write Captions with Gemini

Gemini, Google's artificial intelligence, is a powerful tool for writing impactful and optimized captions. Whether you work on YouTube videos, presentations, or multimedia content, Gemini can help you produce clear, synchronized, and faithful captions. In this tutorial, you will learn how to leverage Gemini step by step to generate professional-quality captions. We will cover preparing your content, formulating the right prompts, adapting tone and style, and final review. By the end of this guide, you will be able to produce accurate and engaging captions in minutes, regardless of the format of your audiovisual project.

Prerequisites

  • 1.Have a Google account with access to Gemini (gemini.google.com)
  • 2.Have the script, transcription, or audio/video file for which you want to write captions
  • 3.Know the target language and desired caption format (SRT, VTT, plain text)

Steps

1

Prepare Your Source Content

Before using Gemini, gather your material. If you have a video, first extract the raw transcription using a tool like YouTube Studio or Whisper. If you start from a written script, ensure it is complete and up to date. Copy the text into an accessible document. The more accurate your source content, the better the captions generated by Gemini.

Tip: If your video is on YouTube, you can retrieve the automatic transcription from YouTube Studio > Captions, then correct it with Gemini.
2

Submit the Transcription to Gemini for Structuring

Paste your raw transcription into Gemini and ask it to split it into coherent caption segments. Gemini will analyze the text and reformat it into short, readable blocks suitable for on-screen display. Each segment should ideally contain 1 to 2 lines of 42 characters maximum.

Here is the transcription of a video. Break it down into captions of 1 to 2 lines maximum (42 characters per line). Each caption must correspond to a complete unit of meaning. Number each block. Here is the transcription:

[PASTE_YOUR_TRANSCRIPTION_HERE]

Tip: Specify the approximate duration of the video so Gemini can better estimate the timing of captions.
3

Adapt the Tone and Language Level

Captions must match the register of your content. A technical tutorial requires precise vocabulary, while a vlog demands a more conversational tone. Ask Gemini to adjust the style according to your target audience and the video context.

Take these captions and adapt them for a [PROFESSIONAL / GENERAL / YOUNG] audience. Use a [FORMAL / CONVERSATIONAL / DIDACTIC] tone. Simplify overly long sentences and ensure each caption is understandable without visual context.

[PASTE_YOUR_CAPTIONS_HERE]

Tip: For educational content, ask Gemini to replace technical jargon with more accessible terms while maintaining accuracy.
4

Format Captions in SRT or VTT Format

Once the content is validated, ask Gemini to convert your captions into the technical format required by your platform. The SRT format is the most universal, compatible with YouTube, Vimeo, and most video players. The VTT format is used for the web (HTML5).

Convert these captions to SRT format with timestamps. The video is [X] minutes long. Distribute the timestamps evenly based on the number of captions. Start at 00:00:00,000. Here are the captions:

[PASTE_YOUR_CAPTIONS_HERE]

Tip: Timestamps generated by Gemini are approximate. You will need to adjust them manually or with a tool like Subtitle Edit for perfect synchronization.
5

Review, Correct, and Finalize

Carefully review the generated captions. Check spelling, grammar, punctuation, and consistency with the audio content. Ask Gemini to correct any detected errors or improve the flow of certain passages. Then test your captions by integrating them into your video to validate readability and timing.

Review these captions and correct all spelling, grammar, and punctuation errors. Check that each caption does not exceed 42 characters per line and 2 lines per block. Flag any passages that may be ambiguous or poorly phrased.

[PASTE_YOUR_CAPTIONS_HERE]

Tip: Read your captions out loud: if you run out of breath, the caption is too long and needs to be split.

Common mistakes to avoid

  • ✗Creating captions that are too long, exceeding 2 lines or 42 characters per line, making reading on screen difficult
  • ✗Not specifying the video context (subject, tone, audience) in the prompt, resulting in generic and unsuitable captions
  • ✗Relying on timestamps generated by AI without manually checking them against the video, causing synchronization delays
  • ✗Forgetting to review captions for meaning errors or words incorrectly transcribed by automatic transcription
  • ✗Neglecting punctuation in captions, which hinders comprehension and reading rhythm

FAQ

Can Gemini generate captions directly from a video file?
Yes, Gemini can analyze video files uploaded directly to the interface. You can ask it to transcribe and format captions from the video. However, for optimal results on long videos, it is recommended to extract the transcription first and then submit it as text.
Are captions generated by Gemini synchronized with the audio?
Gemini can estimate approximate timestamps, but they will not be perfectly synchronized with the audio. For precise synchronization, use dedicated software like Subtitle Edit, Aegisub, or YouTube Studio's caption editor after generating the text with Gemini.
Can I use Gemini to translate captions into another language?
Absolutely. Gemini excels at translating captions. Submit your formatted captions and request a translation into the target language, specifying to keep the SRT format and adapt cultural expressions rather than translate word for word.

Related tutorials

How to Transcribe a Video with GeminiHow to Translate Text with GeminiHow to Write Captions with ChatGPT

How to use this prompt

  1. Copy the prompt with the button above.
  2. Paste it into ChatGPT, Claude or your favorite AI assistant.
  3. Replace the bracketed variables with your details, then refine the result.

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