How to Add Subtitles to an MP4 Video on Windows or Mac

Here’s how to add subtitles to an MP4 video:

  1. Download and install the converter.

  2. Open videos and pick an MP4 preset.
  3. Add SRT files and convert your files.
Edited by Ben Jacklin

Subtitles are a handy feature for many reasons. Unfortunately, some MP4 video files do not have subtitles encoded. However, it is possible to add subtitles to an MP4 video using a video converter.





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Subtitle autogeneration

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Why add subtitles to your MP4 video? Here are some situations in which they may become handy.

Learning or practicing a foreign language

Watching an undubbed foreign film

Creating an educational video

How to add subtitles to an MP4 file in Movavi Video Converter

OS: Windows, macOS

Best for: adding subtitles and converting videos

If you want to combine a video with SRT subtitles, Movavi Video Converter is the tool you need! You can encode the translation permanently with it, so you can watch your favorite films and series on any device. Movavi Video Converter also converts files into different formats, joins separate videos, compresses media, and even changes the resolution of any video.

Step 1. Install the subtitle adder

Download the installation file for Mac or Windows, open it, and follow the instructions to install the software.

Step 2. Add your MP4 files

Click Add Media, then choose the Add Video option. Select the videos you want to attach subtitles to. The files will be added to the program.

Step 3. Select the subtitles

Click No subtitles in the output information section. In the pop-up window, click the Add button and select the subtitles you want to insert into your video. If the SRT file has the same name as the video and is located in the same folder, the program will suggest the subtitle track automatically, and it will appear in the list of subtitles. You can also choose the Apply to all files option to merge the subtitles into all the chosen videos.

If you want to find subtitles online, after clicking Add, choose Search online. In a new dialog box, just click Search. You will get a list of subtitles that match the metadata of your file. Select the subtitles that suit you best.

Step 4. Choose the preset for conversion

Open the Video tab and select the MP4 format. If you are satisfied with the resolution of your video, choose the MP4 H.264 - Original Size option. If not, you can choose any other resolution from the list that you feel would work better.

Step 5. Add SRT to the MP4 video

Select the target folder for your videos by clicking the Save to button at the bottom of the program window. By default, the subtitled videos will be saved in the "Movavi Library" folder. Hit Convert to add the SRT file to your video. The folder with the output files will open as soon as the processing is done. Now you can burn the hard-subbed video on a DVD or transfer it to any device.

Now you know how to add subtitles to MP4. You can follow the same simple steps to embed subtitles into videos in any other format (including AVI, MOV, WMV, or MPEG).

How to add subtitles to MP4 online


Best for: Rapid subtitle attachment

Fastreel is a free online program with a highly intuitive interface featuring drag-and-drop functionality. It can be used to rapidly add subtitles to a video online.

To add subtitles to an MP4 online using Fastreel, go to Fastreel’s homepage.

Visit Fastreel

Either drag and drop the MP4 file into the allotted space or click Add Your File to search your computer for the correct file. Next, click Upload SRT, then click the Continue button to choose your Save option.

Happy Scribe

Best for: Customizing the appearance of subtitles

Happy Scribe is a free online program that allows you to attach SRT files to an MP4. It also provides options for customizing the color, font, and position of subtitles.

To add subtitles to an MP4 on Happy Scribe, go to Happy Scribe’s homepage.

Visit Happy Scribe

Click Select File under Select Your MP4 File and find the MP4 file to which you want to add subtitles. Then, if you have an SRT file for the video, click Select File under Select Your Subtitles File. If you do not have an SRT file, click Autogenerate subtitles. Finally, click the Add Subtitles button.


Best for: Adding subtitles to a video from cloud storage

Clideo is a free online program that allows you to attach SRT files to an MP4 or enter them manually. Clideo can access video files directly from the popular cloud storage programs Google Drive and Dropbox.

To add SRT to an MP4 on Clideo, go to the Clideo homepage.

Visit Clideo

Click Choose File to find the MP4 on your computer. If you want to upload from Google Drive or Dropbox or use a URL, click the down arrow next to Choose File. To add subtitles manually, click Add Subtitle, type in the text, and set its timing. To add an SRT file, click Download SRT. Lastly, click Export. You can save the video file to your computer, Google Drive, or Dropbox.

How to add subtitles to MP4 in VLC

OS: macOS, Windows, iOS, Android

Best for: Adding subtitles to an MP4 on any OS

VLC is a popular multimedia player and editor that is compatible with any OS. VLC works with virtually every file format and can be used to add subtitles to MP4.

Get VLC media player

Here’s how to add subtitles in VLC:

  1. Open your video file in VLC and let it begin to play.

  2. From the menu bar, click Subtitle.

  3. Click Add Subtitle File.

  4. Find the SRT file you want to upload and click Open. That’s it! Now you know how to hardcode subtitles with VLC.

Subtitling tips

Here are tips on how to add SRT to MP4 on Mac or Windows.

Tip #1. Search for subtitles

Just about every film and TV show has a subtitle file created forth by a gracious sole. You only need to find it.

To do so, visit a subtitle website (such as Subscene and Next, look for your show, download its SRT file, and embed the SRT into MP4.

There are also options where you're able to search and add subtitles to MP4 permanently or otherwise – on a single platform, as seen in Movavi Video Converter.

Search for subtitles in Movavi Video Converter

Do you have a thrilling, untranslated movie in a foreign language? And would love to watch it while listening to the original voices of cast members? Here's how to search its subtitles in Movavi Video Converter.

  1. Add your video to the program.

  2. In the menu bar, select Edit and open the Subtitles tab.

  3. Click the Add button.

  4. And since you don't have the subtitles for the thriller yet, choose Search online. If the file name appearing in the search field is different from the title of your thriller, clear the search field and rename the file.

  5. Choose your preferred language of the subtitles and click Search.

  6. The program will return a list of subtitles that matches your metadata. Select the SRT file that suits you best and hit Download and Add.

  7. Hit Apply and then Save and Close.

  8. Click Convert to merge SRT with MP4.

Tip #2. Edit an SRT file

Once you have added subtitles to MP4 on Mac, it's time to edit the time codes, texts, fonts, color, and whatnot.

To do so, right-click your SRT file and hit Open With; choose a text editor (such as WordPad, Notepad, Notepad++, or TextEditor) on your PC. Then, change the wording, times, and anything else as needed.

Edit an SRT file on Notepad++

Edit an SRT file on Notepad++

Assuming you have the Notepad++ application installed on your PC (if not, download it – it's free), here is how you'll go about editing.

  1. Right-click your SRT file and hit Open on the pop-up menu. Hit the radio button next to Select a program, select Notepad++, and hit Open.

  2. If you're not getting the characters in your preferred language, save the SRT file in Unicode mode. To do so, highlight the text, go to File, click Save As, select Unicode (in the encoding dropdown menu), and hit Save.

  3. Ensure the SRT file is correct in that; it only has one line of each language per section.

  4. On the top bar menu, select Macro and click Start Recording. Then, edit the phrases, text format, or the time a subtitle phrase is displayed. Once done editing a given section, click Stop Recording. Note, you can use commands such as CTRL + L to remove a line or use a mouse and keyboard to type in the changes manually.

  5. Move the cursor to a section to be edited next, select Macro, click Playback (or hit CTRL + SHIFT + P). That action will repeat the same edits done in the previous section just once.

  6. You can repeat step 5 until the end of the SRT file or or go to Macro, hit Run a Macro Multiple Times. A dialog box will appear prompting you to select what Macro to play, the times to play it, or to play it to the end of the SRT file. Select accordingly and hit Run.

  7. Click File and hit Save to preserve your edits in SRT format.

  8. Note, you can create numerous Macros (per editing task in a given section) while editing one SRT file, which requires you to save the Macros before creating the next. To do so, click Macro and select Save Current Recorded Macro. A dialog box will pop-up, which will prompt you to add the name and default key-combinations of the Macro. You can then access the saved macro from the Macro menu or Playlist.

  9. To delete or edit an existing Macro, use a Shortcut Mapper – an interface available via the Macro > Modify Shortcut/Delete Macro menu entry.

  10. Once done, you can add the SRT file to MP4.

Tip #3. Edit subtitles styles

Adding subtitles to MP4 videos is handy. However, subtitles may sometimes be in undesired color, size, or style, which can spoil the watching experience. You cannot enjoy a video in a foreign language if the subtitles/texts are too small for easy reading, now, can you?

Luckily, you can solve the irritancies with a subtitle editor, such as Movavi Video Converter – that not only allows you to edit subtitles but also to add them in the first place.

Let's see how to do the edits.

Edit subtitles styles in Movavi Video Converter

Here's how to get your desired subtitle styles in Movavi Video Converter.

Upload your video with subtitles to the converter, click Edit, and go to the Subtitles tab.

To edit the text font, click the Select Font button. A dialogue box will appear, which will prompt you to select your preferred font in the Font column. Select the appropriate option to make the text italic or bold in the Font Style column. Pick the suitable value (to make the texts larger or smaller) in the Size column. Once done, click OK at the bottom of the dialogue box.

To adjust text colors, click the Fill Color button and hit on your preferred color. You can also click the Outline Color button and pick the desired option to change the color of the text outline.

Tip #4. Change the positions of subtitles on screen

If on loading an external SRT subtitles file, the subtitles appear on top of the MP4 video and not at the bottom – as you desired – do not panic.

You can change their position in the VLC player or other video players, right there and then.

Go to the Position section, open the dropdown list, and place the desired location – be it top, middle, or bottom; left or right.

Alternatively, you can change and specify the positions of the subtitles with Movavi Video Converter, as described below.

Change the positions of subtitles on screen with Movavi Video Converter

On the Subtitles tab, go to the Position section and open the drop-down list.

Position your subtitles in the top, middle, or bottom of the screen. While at it, you can move them to the right or left per your preference.

Tip #5. Synchronize subtitles with audio

If the subtitles are out of sync with the audio, they may appear early or later than expected. To fix this, change the synchronization settings on your audio player, accordingly. Once done, click Apply and hit done to exit the editing window.

You can also use a video editor to solve the synchronization problems as described below.

Synchronize subtitles with audio using Movavi Video Converter

On the Subtitles tab, use the Synchronization box to delay or advance subtitles by a specific amount of time – in seconds or milliseconds.

Positive values delay the subtitles, while negative values advance the subtitles.

For example: - 0.200 setting advances the subtitles by 200 milliseconds while 1.100 setting delays the subtitles by 1 second and 100 milliseconds.

Tip #6. Making subtitles yourself

Subtitles are made in several formats, with SRT files being the easiest of them all. Here, we discuss how to make an SRT file in a text editor to help attach subtitles to MP4.

There is free software such as Subtitle Workshop or Aegisub that enables you to type in and lock subtitles to specific time codes. Before we get started, bear in mind that making subtitles yourself is time-consuming. Dedicate some time to understand the interface, shortcuts, and commands of the software package of your choice.

Making subtitles in a text editor

You can create an SRT file with any text editor in existence – you need to install it in your gadget. For instance, Windows users can create a file using Notepad, while Mac users can use TextEdit.

The catch?

Format the text correctly to include:

[Number of the subtitles section]

[The beginning time of the subtitle display] – [The ending time of the subtitle display]


The timestamp should include: [hours]: [minutes]: [seconds], [milliseconds]

Note, you must follow the right format for the SRT files to work.

Once done, convert the SRT file to plain text and save it as an SRT file (i.e. change the .txt extension into .srt). To convert the SRT file into plain text, highlight the content, then go to Format (usually on the top bar) and hit Make Plain Text. With the changes saved, you can now add the SRT to MP4 on Mac.

In addition to text editors, you can create subtitles using YouTube and other Video Creators or MP4 subtitlers.

Key considerations when making subtitles

Regardless of the tool used, choose appropriate word speed, a balance between fast and slow reading. Strive to attain the 160 -180 words/minute – as that's the average reading pace of an adult.

Ensure the subtitles are not distractive. Here, take into account the position of the subtitles on the screen and their word count. Ideally, the subtitles should not block the view.

Add extra information, if need be. For example, you can add translations or describe the sound surrounding a scene to help people with hearing problems understand the actions. Bracket the extra information to separate from the main text.

And when it comes down to it, practice is a must.

Like any other skill, you have to practice to get better at making and adding subtitles to MP4. Thus, read tutorials on how to embed subtitles into MP4 and utilize free subtitling software packages or the free trials (in premium packages) to create and merge subtitles with MP4.

Editor's choice

Frequently asked questions

❓ What is an SRT file?

🖥 How do I add subtitles to an MP4 video on a Mac?

🎞 How do I add an SRT file to a video?

💻 How do I hardcode subtitles with VLC?

❔ How do I open an SRT file?

👨‍💻 Hardsub vs. softsub: what's the difference?

🔎 How do I add subtitles to a video without any software?

🎬 How do I add subtitles to an MP4 in Windows Media Player?

❔ How do I add subtitles to an MP4 without encoding?

💻 How do I add subtitles to an MP4 in Handbrake?

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