How to Transcribe a Video and Create Subtitles (MP4 to SRT)

Oct. 14, 2026

How to Transcribe a Video and Create Subtitles (MP4 to SRT) | AI Transcription Service - Mr. Transcription

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    dog
    Adding subtitles to videos is such a chore...!
    Don't worry, there's an easy way to do it!
    cat

    For anyone who makes videos, adding subtitles and captions is a tough job.

    Typing in the text and setting the start and end times is usually more work than cutting and joining the video footage.

    But what if that subtitle work could be automated…?

    In fact, with the latest AI technology, you can automate the most tedious subtitle-related work.

    The method is simple: just upload the MP4 file you made for YouTube to an AI transcription service.

    Since you no longer have to do the most troublesome work, you can cut the time spent on video editing by more than half.

    This article explains how to transcribe MP4 files made for video sites such as YouTube into text and add subtitles.

    It also covers the specific steps in the two major video editing programs, Adobe Premiere and DaVinci Resolve, so why not use it as a guide and add subtitles to your own videos?

    How to Transcribe a Video and Add Subtitles (Works with MP4 Videos for YouTube!)

    For people who make videos for work or as a hobby, and for YouTubers, adding subtitles is one of the most troublesome tasks.

    In fact, by transcribing your video with the latest AI, you can add subtitles easily.

    The Flow of Adding Subtitles to a Video

    動画に字幕をつける流れ

    If you upload videos to video sites such as YouTube, you are probably using video editing software such as Adobe Premiere or DaVinci Resolve for editing.

    In fact, both programs can import subtitle files such as "srt files", so you don't have to type the subtitles in by hand; you can add subtitles automatically just by importing the contents of the subtitle file.

    dog
    I didn't know this, so I've been adding subtitles by hand all this time...

    The Old Way (Typing Everything by Hand)

    Until now, you had to add the subtitle text by hand like this.

    これまでの作業方法

    For every single subtitle, you had to

    • Type in the subtitle text
    • Set the start time and end time

    so video editing took a very long time.

    The New Way (Using an AI Transcription Service)

    But from now on, you don't need to do any of that!

    Just import the subtitle text transcribed by AI, and subtitles are added from the beginning to the end of your video in an instant!

    これからの作業方法

    Of all the work involved in video editing, adding subtitles and captions was especially time-consuming.

    With an AI transcription tool, you can cut the time spent on video editing by more than half.

    Why not use an AI transcription tool and make your video editing far more efficient?

    For Transcribing Video Subtitle Text, Try "Mr. Transcription"

    文字起こしさん

    For creating subtitles, we recommend "Mr. Transcription"!

    "Mr. Transcription" is a recommended AI transcription tool for creating subtitle text for videos.

    By using the latest speech recognition AI, it creates subtitle text quickly and with high quality.

    What's more, you can upload and import video files directly, so there is no need to go to the trouble of creating an audio file just for making subtitles.

    It supports many file formats for upload,

    • MP4
    • MOV
    • AVI
    • FLV
    • MKV
    • WEBM
    • WMV
    • 3GP

    covering all of the major video file formats.

    You can transcribe directly from an MP4 video made for YouTube, or from a MOV file of footage shot on an iPhone.

    For details on supported files, see this article.

    文字起こしさんの対応ファイルと対応ファイルサイズ。対応外ファイルを対応ファイルにする方法

    Files and File Sizes Supported by Mr. Transcription, and How to Convert Unsupported Files

    A guide to the files Mr. Transcription supports and what to do when your file is not supported.

    It also supports 100 languages, including Japanese and English (using the latest AI), so you can also use it like this:

    Transcribe in a foreign language → translate into Japanese with AI to create subtitles

    and so on.

    What's more, "Mr. Transcription" is free for up to 10 minutes a day!

    With "Mr. Transcription," an AI transcription tool that covers everything video editors need, why not boost your video views?

    How to Create a Subtitle File from an MP4 Video for YouTube

    From here, we explain in detail how to use the AI transcription service "Mr. Transcription" to transcribe an MP4 file for YouTube into a subtitle text file.

    1. Open the "Mr. Transcription" Top Page

    文字起こしさん

    The AI transcription service "Mr. Transcription" is used from a web browser.

    You upload videos from the top page.

    Go to the "Mr. Transcription" top page

    You can use it from any environment, whether a Windows or Mac computer or an iPhone or Android smartphone, as long as you are connected to the internet.

    2. Upload the Video

    Drag and drop your video onto the area that says "Drag & drop files", or click "Select file" and choose the file.

    アップロードする場所

    After selecting the file, click the "Upload" button.

    アップロードボタン

    The file upload starts.

    This time, we uploaded an MP4 file encoded for YouTube.

    3. Transcription to Subtitle Text Begins

    When the video file (an MP4 file in this case) has finished uploading, transcription starts automatically.

    自動で文字起こし処理が開始

    Once you see this screen, it is fine to close the browser window.

    You will be notified by email when the subtitle text transcription is complete.

    (Of course, there is no problem if you keep the screen open.)

    4. Transcription Complete

    When the transcription is finished, you can check the result transcribed into text.

    If you kept the screen open, it switches and the transcription result is displayed.

    画面が切り替わって文字起こし結果が表示In this case, you can download the subtitle file with the "Download subtitles" button.

    「字幕をダウンロード」ボタン

    You can also check the transcription result by using the play button next to each utterance to play the video's audio from that point.

    When you play the audio with the player at the bottom of the screen, the displayed text switches in step with the playback position.

    If you closed the screen after uploading, click "History" in the menu,

    履歴をクリック

    and open the "Transcription History" page.

    履歴ページ

    On this screen, click the file name,

    クリックする場所

    and the details screen opens like this.

    詳細画面

    On this screen, click "Download subtitles" to download the subtitle file.

    字幕をダウンロード

    That completes the subtitle transcription work.

    About the Subtitle File from "Mr. Transcription"

    The file name is "uploaded file name.srt".

    For example, in this case it is douga-mojiokoshi.mp4.srt.

    ファイル名

    The subtitle file format is an srt file.

    An srt file is a file format widely used for video subtitle text, and its contents are a text file containing timecodes and sentences, like this.

    On Windows

    srtファイルの中身

    On Mac

    Macの場合

    Video editing software such as Adobe Premiere and DaVinci Resolve, as well as YouTube's subtitle feature, support srt files, so all that remains is to import this subtitle file and the subtitle text is added automatically.

    * Even if you edit the content on the Mr. Transcription web page, the edits are not reflected in the subtitle file.

    If you want to edit the subtitles, download the subtitle file and edit it directly with an app such as Notepad.

    SRT files are explained in more detail in this article. Please take a look.

    【無料】SRTファイルの作り方|動画字幕をブラウザだけで作る方法

    [Free] How to Create an SRT File: Make Video Subtitles in Just Your Browser

    How to create an SRT file, a subtitle file that records subtitle text and display times. With an AI transcription site, you can make one in just your browser. Also covers how to use it in video editing software and on YouTube.

    How to Add Subtitles to a Video from a Subtitle File in Adobe Premiere

    Next, we explain how to add subtitles in "Adobe Premiere" and "DaVinci Resolve," both widely used by video editors.

    First up is "Adobe Premiere".

    * This explanation uses Adobe Premiere 23.6.0.

    1. Open the Project

    First, open the project you want to add subtitles to.

    プロジェクトを開く

    In this example, only the video footage has been imported, and there are no subtitles or captions at all.

    2. Import the Subtitle File (srt File) as an Asset

    Import the srt file of the transcribed subtitle text into the "Project" panel as an asset.

    Either drag and drop the srt file,

    ドラッグ&ドロップ

    or import it from the menu with "File" → "Import".

    「ファイル」→「読み込み」

    * This is the same as when you normally import assets such as video and audio.

    The srt file has now been imported.

    読み込まれた状態

    3. Bring the Subtitle File into the Timeline

    Drag and drop the srt file onto the timeline.

    タイムラインにドラッグ&ドロップ

    A dialog called "New Caption Track" appears, so click "OK".

    新しいキャプショントラック

    The subtitle text is then imported automatically, as shown here.

    字幕が読み込まれた

    When you press the play button to check, the subtitles are set perfectly across the whole video, as shown here.

    動画全体に字幕が設定されている

    Of course, you can also edit the duration,

    デュレーション

    and edit the text content.

    テキスト編集

    4. Encode

    After that, just encode to an MP4 file for YouTube.

    That completes the flow of adding subtitles to a video for YouTube MP4 in Adobe Premiere.

    How to Add Subtitles to a Video from a Subtitle File in DaVinci Resolve

    Next, we explain how to add subtitles to an MP4 file for YouTube using "DaVinci Resolve", video editing software that is as widely used as Adobe Premiere.

    * This explanation uses DaVinci Resolve 18.1.1.

    1. Open the Project

    First, open the project you want to add subtitles to.

    プロジェクトを開く

    Only the video footage (the source MP4 file) has been imported, and there are no subtitles or captions at all.

    2. Add the Subtitle File (srt File) to the Media Pool

    Add the srt file of the subtitle text to the Media Pool.

    You can drag and drop it,

    メディアプールにドラッグ&ドロップ

    or add it from "Import" → "Subtitle" under "File".

    「読み込み」→「字幕」

    3. Drag and Drop the Subtitles

    Drag and drop the srt file to insert the subtitles.

    ドラッグ&ドロップして字幕を挿入

    The subtitles now appear over the video footage, as shown here.

    字幕が表示された

    4. Adjust the Subtitles

    However, unlike in Adobe Premiere, DaVinci Resolve requires you to adjust the subtitles.

    In this example the left and right sides of the subtitles are cut off.

    左右が切れている

    Before encoding to an MP4 file for YouTube or similar, tidy up the subtitles and decorate the text.

    5. Encode

    When the subtitle adjustments are done, encode the video in the final format, such as MP4.

    That completes the flow of adding subtitles in DaVinci Resolve.

    [Reference] How to Add Subtitles to a Video Already Uploaded to YouTube

    This article explains how to add subtitles from an srt file using YouTube's subtitle feature to an MP4 video that has already been uploaded to YouTube.

    Please read it as well.

    【YouTube投稿者向け】動画に字幕・文字起こしを設定する方法を解説

    [For YouTube Creators] How to Set Subtitles and Transcripts for Your Videos

    How to set subtitles and transcripts on your own videos posted to YouTube. Just upload a video to create an SRT file of higher quality than YouTube's auto-generated subtitles, in just your browser. Covers how to add Japanese subtitles, language settings, and uploading the subtitle file...

    [Reference] How to Transcribe Any Video File and Create Subtitles

    How to transcribe video files other than MP4 and create subtitles is explained in this article.

    Please read it as well.

    動画の字幕をテキスト化!動画を文字起こしして字幕を作る方法【無料】

    Turn Video Subtitles into Text! How to Transcribe a Video and Create Subtitles [Free]

    How to transcribe videos and footage and create subtitles. Just upload a video to create an SRT file of higher quality than YouTube's auto-generated subtitles, in just your browser. Recommended free services and how to add subtitles for those who want to turn video subtitles into text...

    Why Not Add Subtitles and Increase Your Video Views?

    As you can see, adding subtitle text to an MP4 file for YouTube is very easy.

    With the AI transcription service "Mr. Transcription," the subtitle text is ready right away just by uploading an MP4 file.

    By adding subtitles to your videos, you can gain more viewers and increase watch time.

    Transcribing your video also makes it easy to translate into foreign languages, so you can add foreign-language subtitles and get viewers from overseas.

    Why not use the AI transcription service "Mr. Transcription" and get your videos in front of even more people?

    ■ AI transcription service "Mr. Transscription"

    "Mr. Transcription" is an online transcription tool that can be used from zero initial cost and 1,000 yen per month (* free version available).

    • Supports more than 20 file formats such as audio, video, and images
    • Can be used from both PC and smartphone
    • Supports technical terms such as medical care, IT, and long-term care
    • Supports creation of subtitle files and speaker separation
    • Supports transcription in approximately 100 languages ​​including English, Chinese, Japanese, Korean, German, French, Italian, etc.

    To use it, just upload the audio file from the site. Transcription text is available in seconds to tens of minutes.
    You can use it for free if you transcribe it for up to 10 minutes, so please try it once.

    It is "Mr. Transcription" who can easily transcribe from audio, video, and images. Transcription allows you to transcribe for up to 10 minutes for free. You can copy, download, search, delete, etc. the transcribed text. You can also create subtitle files, which is ideal for transcription of interview videos.
    HP: mojiokoshi3.com
    Email: mojiokoshi3.com@gmail.com
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