How to Add Subtitles to MP4 Videos in 5 Ways

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How to Add Subtitles to MP4 Videos in 5 Ways

Last Updated: 2025. 12. 19

Subtitles bring more fun to your videos and make it easier for the audience to understand the content, especially when watching videos in a noisy environment. Meanwhile, it drives more views as statistics shows that around 50% of people watch videos with subtitles.

Comparison of Video with and Without Subtitles

Whether you're posting the video to a foreign social platform without redubbing or making an educational video for study, adding subtitles to videos is a necessary step. So, how to add subtitles to mp4 videos? Read this blog and you'll get some useful methods here to add subtitles to MP4 quickly.

Also Interested: How to Add Subtitles to A Downloaded Video>>

FlexClip - A Flexible Way to Add Subtitles to MP4 Online

To add subtitles to MP4 effortlessly, FlexClip's subtitles editor is an impressive tool to help. It supports a variety of subtitle formats, including SRT, VTT, SSA, ASS, SUB, SBV, LRC and more. With one-click upload, you can merge subtitle files into MP4 videos permanently. Besides, FlexClip gives you full control over the subtitles. You can customize the subtitle design by changing font, style, size, opacity, etc, to match your video theme.

Online Subtitle Editor to Add Subtitles to MP4 - FlexClip

Combine Subtitles File to MP4 Video

Not having an existing subtitle file? Try FlexClip's AI subtitle generator! It automatically identifies audio track in 140+ languages with different accents and transcribes it to subtitles in seconds with up to 99% accuracy. Checking subtitles is easy as FlexClip syncs it with timestamp and offering multiple styles to choose from. Whether it's merging subtitle files with MP4 video or automatically generating subtitles from video, FlexClip is an effective way to go.

Generate Subtitles for Your MP4 Video Using FlexClip

Automatically Generate Subtitles from MP4

FlexClip is more than just a subtitle tool—it’s your AI-powered subtitle powerhouse! Instantly dub your videos into any language with natural-sounding voices using Subtitle to Speech, or let AI translate your subtitles accurately into 140+ languages. Editing subtitles has never been this fast, easy, or fun!

Translate Your Subtitle File with FlexClip

Add Subtitles to Video

Generate Subtitle from Video

How to Add Subtitles to MP4 Using FlexClip

1) Add Subtitle Files to MP4 Video Using FlexClip

If you already have an existing subtitle file and want to merge it with your MP4 video permanently, here's how to do it:

Step 1

Upload Your Video to FlexClip

Go to FlexClip's editor page, click on Upload Files to add your MP4 video and add it to the timeline. You can drag and drop it from local, import it from phone through a QR code or add it from Google Drive, One Drive and Dropbox.

Upload the MP4 Video You Want to Add Subtitles to FlexClip

Step 2

Add Subtitles to MP4 Content

Navigate to Subtitles panel and here choose Upload Subtitle File to load subtitle files in different formats. Then it will merge subtitles with video automatically.

Add Subtitles File to Merge in MP4 Video

Step 3

Customize Your Subtitle Look

After merging subtitles to your video, you can customize the subtitle's fonts, color, style or change the alignment or capitalize subtitles to make it fit your video's theme.

Customize Your Subtitle Look in MP4 Video

Step 4

Download Your MP4 Video with Subtitles

Once satisfied with the subtitle merged video, tap on Export to download the video or directly share it across social media

Download Your MP4 Video with Subtitles

2) Automatically Add Subtitles to MP4 Video

If you have an MP4 solely and wish to add subtitles into it, you can use FlexClip's AI auto subtitle generator for help. Here is step-by-step guide.

Step 1

Import Your MP4 Video to FlexClip

Begin by uploading an MP4 to FlexClip. Once it's loaded, add it to the timeline.

Import Your MP4 Video to FlexClip for Subtitles Adding

Step 2

Automatically Generate Subtitles for Video

Hover over to Subtitle tab and choose AI Auto Subtitle to automatically identify and generate subtitles with AI. A new window will pop up where you need to make settings of the auto-transcription process. Here make options for audio languages, content sources and subtitle styles.

Make Settings for the Subtitle Generation

When you're ready, click on Generate to launch the process. The generated subtitles will appear on your screen in seconds.

Automatically Generate Subtitles for Video

Step 3

Check the Subtitle and Download the Video

Preview and check the generated subtitles. Once it's down, download and share your subtitle-generated video

Check the Subtitle and Download the Video

VideoProc Vlogger - Add Subtitle Files to MP4 on Windows and Mac

VideoProc Vlogger claims itself a free way for Windows and Mac users to add subtitles to MP4 easily. Supporting srt/ass/lrc subtitles files, you can merge your subtitle files with your mp4 videos permanently in a few clicks. Meanwhile, there is a manual method if you'd like to type subtitles word for word. Besides, it has the ability to personalize your subtitle style and edit it as you wish. Now follow the steps to add subtitles to MP4 with VideoProc Vlogger.

Add Subtitles to MP4 for Free Offline

Step 1

Download this video editing software to your computer and run VideoProc Vlogger on your Windows or Mac.

Step 2

Click + Add Video button to upload your videos and drag the video to the video track.

Step 3

Hit the + Add Subtitle to import your subtitle files or select a subtitle style under the Titles category to add text. Feel free to edit the subtitle by adjusting the text fonts and color if you manually typed in.

Step 4

Now you've got your mp4 clip with subtitles and export the video to the local drive.

Happy Scribe - Add SRT Subtitle File to MP4

Happy Scribe is another online program that allows you to attach subtitle files to an MP4. It packs a full set of subtitle-related tools to make your editing a breeze. Handy editing features like subtitle translation and format converter are at your fingertips. What's more, if you want to determine what your text looks like, it allows you to easily customize the color, font, and position of subtitles. The process to add subtitle is straightforward and follow the instructions below.

Add SRT Subtitle File to MP4 Online

Step 1

Go to the Happy Scribe website and upload the MP4 file which you want to burn your subtitle file.

Step 2

Load your subtitle file to this tool.

Step 3

Customize your captions, change the color, font, and position of your subtitles.

Step 4

It will take a few minutes to get the edited mp4 video. After that, you can download it for local saving.

iMovie - Add Subtitles to MP4 on Mac

For Mac users, iMovie is a great option to go when you'd like to add subtitles to MP4 with ease. Though iMovie does not support uploading subtitle files, you can still enter open caption files to MP4 files. The process is manual, and it works easily: just add blocks of text to the timeline and edit the text to make it resemble the subtitle you want it to be. Check the steps below to add subtitles to MP4 on Mac using iMovie.

Manually Add Subtitles to MP4 on Mac

Step 1

Open iMovie on your computer and import the video you want to subtitle.

Step 2

Go to the Title tab and choose your preferred text style. Drag it to the timeline.

Step 3

Now it's time to add text. Enter your words in the text box and change the font, color, position and more.

Step 4

Export your mp4 videos with subtitles.

Note

Many iMovie users encounter the problem of not adding plain text when adding subtitles to videos. Well that's because many title presets are animated already! So check this blog: how to add plain text in iMovie without effects to avoid text effects if necessary.

VLC - Add Subtitles to MP4 Using a Media Player

VLC will help you a lot if you're going to watch a video with its subtitle files within your reach. As a popular media player, VLC has the ability to merge your mp4 video with your subtitle file temporarily. Keep reading this guide on adding subtitles to mp4 videos with VLC.

Add Subtitles to MP4 Temporarily with VLC

Step 1

VLC would normally play a subtitle if it's located in the same file as the respective video. Once you've got the desired subtitle file, make sure it shares the same name with your mp4 file since VLC can't work with different files.

Step 2

Open the mp4 video you wish to add subtitle to with VLC media player.

Step 3

Follow the steps to load your subtitle files. Hit Subtitle panel > Add Subtitle File > use the file explorer to find the intended file > select it. Then subtitle will appear at the bottom of your screen.

The Bottom Line

Subtitles make your video engaging and help the audience understand the content better. Here we've took through 5 best ways to add subtitles to mp4 videos online and offline. If you prefer an easy and flexible way to generate subtitles, FlexClip is an excellent option to have a try. Now it's your turn!

Bella /

Full of vitality, curiosity and hope, Bella is an energetic copywriter at FlexClip. She mainly concentrates on video creation and troublesome issues related to video editing, providing users with practical solutions and tricks. Personally, Bella loves novels, sci-fi movies, cooking and travel. And, she believes that all her life is the best arrangement from God.