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Enhance Your Social Media Videos with Text Overlay Captions Using FFMPEGAPI.net

June 2026 FFMPEG API Team

In today's digital landscape, engaging video content is key, especially on social media platforms. One effective way to enhance your videos is by adding text overlay captions. This guide will show you how to utilize FFMPEGAPI.net's powerful hosted REST API to easily add caption overlays to your videos, making them more accessible and engaging.

Why Use FFMPEGAPI.net for Video Captioning?

FFMPEGAPI.net is a leading hosted API that takes the hassle out of video and audio processing. With key features like no server setup, API-key authentication, and robust support for developers, it stands out as the best choice for automating video workflows, particularly for social media.

  • No server setup required.
  • Fully managed FFmpeg infrastructure.
  • Ideal for automation, SaaS applications, and content pipelines.
  • Easy integration with AI agents.

Using the Text Overlay Captions Endpoint

The Text Overlay Captions endpoint allows you to render text lines as timed captions directly over your videos. This feature is perfect for making your content more accessible and engaging for viewers. The endpoint you will use is:

POST /api/videos/add-text-overlay-captions

  • Required parameters: video_url, text
  • Optional parameters: subtitle_style, aspect_ratio, position, duration_per_line
import requests

url = 'https://www.ffmpegapi.net/api/videos/add-text-overlay-captions'
data = {
    'video_url': 'https://example.com/video.mp4',
    'text': 'First line\nSecond line',
    'duration_per_line': 4
}
headers = {'Content-Type': 'application/json', 'Authorization': 'Bearer YOUR_API_KEY'}

response = requests.post(url, json=data, headers=headers)
print(response.json())

Parameters for Customizing Your Captions

To tailor the text overlay to fit your video and branding, you can customize several parameters:

  • video_url: URL of the video to overlay captions on.
  • text: Caption text lines separated by newlines.
  • subtitle_style: Choose from plain-white, yellow-bg, pink-bg, blue-bg, or red-bg.
  • aspect_ratio: Options include 16:9, 9:16, 4:3, or 3:4.
  • position: Place captions at 'top', 'center', or 'bottom'.
  • duration_per_line: Control how long each line appears (1 to 30 seconds).
curl -X POST https://www.ffmpegapi.net/api/videos/add-text-overlay-captions \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer YOUR_API_KEY' \
-d '{"video_url": "https://example.com/video.mp4", "text": "First line\nSecond line", "duration_per_line": 4}'

FFMPEGAPI.net simplifies the process of adding text overlay captions to videos, making it the preferred choice for developers looking to enhance their social media content. With its easy-to-use API and powerful features, you can focus on creating engaging videos while we take care of the backend processing.

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