How to upload caption (.srt) file to Posts

Uploading a caption file for your videos will ensure that all audio is transcribed correctly. Automatic captions can be helpful, but some audio will be undetectable or incorrectly translated. Sometimes the mistakes are neutral or funny, but sometimes they're offensive. The best way to ensure quality captioning is to create the caption file yourself. 

Caption files are a specific file type called SRT. SRT stands for Secure Reliable Transport. In addition to writing out all the spoken words and acted content (these are called audio descriptions), each section of captioned text is related to a time window. At that time in your video, the text associated will appear on the screen. 

Here's an example of what text in a caption file looks like:


00:00:05,000 --> 00:00:10,000

Hi, I’m Brett Lewis. I’m a software 

Engineer at X with


00:00:10,000 --> 00:00:15,000

The Accessibility Experience Team. 

And I’m here today as part of 

Read this article to learn how to create a caption file.

Once your .srt file is created, here's how to upload it to your post:

How to upload caption (.srt) file to a Post


1. Upload a video to your post.

2. Select Upload caption file (.srt) below the video.

Screenshot of a draft Tweet with an uploaded video. The instructions to Upload caption file(.srt) are located below the video.

3. In the pop-up, select the Upload captions button, then choose the caption file from your computer.

Screenshot of the caption upload modal. The heading is Upload caption file (.srt). The content informs customers that subtitles and captions can be added to videos by uploading an SRT file. The call to action button is Upload captions.

4. Select Done.

5. Under the video, the name of the language your captions are written in appears in place of the previous upload command.

Screenshot of the changed caption file name to English.

6. If you're satisfied with your post text, video, and caption file, select post.

When your video plays, and the viewer has captions enabled, the captions will appear toward the bottom of the video.

Screenshot of the opening lines of captioned white text on an opaque black background. On screen, is a still of the side of a building with windows.

Note: Currently this feature is available on web only. 

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