How to Convert MP4 to SRT: The Complete 2026 Guide
The easiest way to convert MP4 video files to SRT subtitle files. Step-by-step guide using free AI transcription. No software required.
What does MP4 to SRT conversion mean?
Converting MP4 to SRT means extracting spoken dialogue from a video file and saving it as a timed subtitle file. The MP4 contains the video and audio. The SRT file contains only the text transcripts with precise timestamps showing when each line should appear and disappear on screen.
This process is also called video transcription, speech-to-text conversion, or subtitle generation. The result is a small text file (usually under 100 KB) that you can upload to YouTube, embed in a video player, or import into any video editing software.
Step 1: Upload your MP4 file
Go to FlowSub and upload your MP4 video. The platform supports files up to 500 MB, which covers most videos under 2 hours at 1080p. FlowSub also accepts MKV, MOV, AVI, WebM, MP3, WAV, M4A, and OGG formats — so you're not limited to MP4.
The upload happens directly from your browser to secure cloud storage. No software installation, no account required for the first 10 minutes of transcription per month.
Step 2: AI transcribes the audio
FlowSub uses OpenAI Whisper, the industry-leading speech recognition model. Whisper automatically detects the spoken language from 29+ supported languages and generates word-level timestamps with sub-second accuracy.
The transcription typically takes 1–3 minutes for a standard 10-minute video. Longer videos are processed in 10-minute chunks to ensure reliability and accuracy, even for hour-long recordings.
Step 3: Download your SRT file
Once transcription is complete, FlowSub generates four formats simultaneously: SRT, VTT, ASS, and TXT. Click Download next to SRT to get your subtitle file. The file is perfectly timed and ready to use immediately.
You can also use FlowSub's built-in editor to adjust any timestamps or fix text before downloading. Pro users can preview the subtitles synced with the video to verify timing visually.
Where to use your new SRT file
Upload the SRT directly to YouTube Studio for automatic caption syncing. Import it into Adobe Premiere Pro, Final Cut Pro, or DaVinci Resolve as a subtitle track. Use it with VLC or any media player that supports external subtitle files. Or embed it in web videos using the HTML5
For social media, Instagram and TikTok don't support SRT uploads directly — but you can use FlowSub's Pro burn-in feature to hardcode subtitles into the video itself, creating permanently captioned MP4s for any platform.
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