Using subtitles is a great way to help your videos reach a broader audience since it allows people to understand your video even if they speak a different language or have to watch it without audio. On top of that, YouTube “reads” your subtitles to determine the content of your videos and recommend it to more people. SRT is one of the most common formats for subtitles, so using it ensures compatibility with as many devices and online platforms as possible.

Easily add SRT to MP4 online

Add SRT subtitles to your MP4 videos quickly

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Add SRT to MP4 in your web browser

Generate SRT subtitles automatically or upload an existing SRT file and add it to your MP4 videos quickly and easily with Flixier. You can even use our tool to edit and customize your subtitles in just a few clicks. Modify the text or timings of an SRT subtitle with a few clicks. Resynchronize your subtitles easily using our powerful timeline and customize the look of your SRT subtitles with dozens of presets, subtitle animations, and hundreds of fonts.

Add SRT to MP4 online

You don't need to download or install apps on your computer to add an SRT subtitle to your MP4 video. Flixier works entirely in your web browser, so you can add or edit subtitles for your videos easily on any device. This makes our tool compatible with all operating systems, including Windows, ChromeOS, Mac, and Linux.

Edit SRT files before adding them to MP4

Flixier makes editing your subtitles a breeze. After you upload your file, you’re free to edit the text and modify the timings manually right on the timeline. There is even a Characters Per Second counter in the panel of each subtitle cell to warn you if your subtitles are moving too fast for people to read. You can also split and merge subtitle cells easily with our intuitive interface.

Customize your SRT file and burn it into your video

Animate or customize your subtitles to keep viewers engaged and watching. Our subtitle editor offers multiple presets and animation effects that you can mix and match to create unique-looking subtitles. You’re free to tweak the font, size, and text style of every preset, allowing you to craft on-brand subtitles that are consistent throughout your videos.

Translate your SRT files automatically

Our AI-powered subtitle translator can translate your SRT subtitles to more than 130 languages in just a few seconds. You can edit and customize each translation manually and save them separately to your computer. If you want your translated subtitles to be animated, you can also burn them into the video when exporting.

How do I add SRT files to MP4?

Upload

Click on Get Started to open Flixier in your web browser. Drag and drop your MP4 video and SRT files to the import menu to add them to your library. You can also use any of the available import options to import your videos directly from cloud storage platforms or your Twitch account.

Add SRT to MP4

To add your SRT subtitle to your video, drag them both from your library to the timeline at the bottom of the screen. Then, you can select the subtitle on the timeline to customize its appearance using the menu on the right side of the screen. You can double-click on any subtitle cell to edit its contents or drag the cells around on the timeline to modify their timings.

Save your video

To save your MP4 video with the added subtitles, click the Export button at the top right corner of the screen. Flixier will process your video in a few minutes and then save it to your computer. You can also publish it straight to YouTube, TikTok, Instagram, or Facebook.