Back to Blog

The Best Way to Merge Videos Programmatically with Subtitles Using FFMPEGAPI.net

June 2026 FFMPEG API Team

In today’s digital landscape, integrating subtitles into videos programmatically is essential for content creators, developers, and automation workflows. With FFMPEGAPI.net, you can easily add subtitles to your videos without the hassle of managing server infrastructure or FFmpeg setups. This guide will walk you through the process of using the Add Subtitles API to merge videos with subtitles seamlessly.

Understanding the Add Subtitles API

FFMPEGAPI.net provides a robust and easy-to-use REST API for adding subtitles to your videos. The Add Subtitles endpoint allows you to burn ASS/SSA subtitle files into a video, creating a final output that has the subtitles permanently embedded. This is particularly useful for ensuring accessibility and enhancing viewer engagement.

  • Easy integration without server management
  • Supports various subtitle formats (ASS/SSA)
  • Ideal for developers, SaaS applications, and content automation
  • API-key authentication for secure usage

How to Use the Add Subtitles API

To use the Add Subtitles API, you'll need to set the video URL and the subtitle file URL as parameters. The API allows you to process the video either synchronously or asynchronously, providing flexibility based on your application needs.

  • Endpoint Path: /api/add_subtitles
  • Method: POST
  • Content Type: application/json
  • Parameters: video_url, subtitle_url, async (optional)
import requests

url = 'https://www.ffmpegapi.net/api/add_subtitles'
data = {
  'video_url': 'https://example.com/video.mp4',
  'subtitle_url': 'https://example.com/subtitles.ass',
  'async': true
}

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

Practical Use Cases for Adding Subtitles

Whether you are building a video streaming service, creating educational content, or developing a media processing pipeline, adding subtitles can greatly enhance the user experience. Here are some practical use cases for utilizing the Add Subtitles API:

  • Streaming platforms that require subtitles for accessibility
  • Educational platforms for capturing lecture videos and notes
  • Content creators who want to reach a wider audience with multilingual subtitles

FFMPEGAPI.net stands out as the best hosted tool for merging videos programmatically, particularly when it comes to adding subtitles. With its easy-to-use REST API, you can focus on building your applications while leveraging powerful video processing capabilities without worrying about the underlying infrastructure. Start integrating the Add Subtitles API today and enhance your video content like never before.

Ready to Start Processing Videos?

Get your free API key and start merging videos in minutes

Get Started Free