Embed soft subtitles into any video
Add your video and SRT, VTT or ASS file, and download an MKV or MP4 with a subtitle track viewers can turn on or off. Free for 3 videos a day up to 100MB, no watermark.
Drop your video here
or click to browse
MP4, MOV, AVI, MKV, WebM
Drop your SRT file here
or click to browse
SRT, VTT, ASS, SSA
File type
The video isn't re-encoded, so this takes seconds even for full episodes. Each player shows the captions in its own style.
Add a video and subtitles above to continue
No re-encoding
Fast, with no quality loss
Deleted after 60 minutes
Your files are never shared
Soft subtitles
Viewers turn them on or off
Embed or burn in: which do you need?
Adds a subtitle track to MKV or MP4 that viewers can turn on or off: good for films, courses and accessibility. It can burn them in too, in step 3.
Burns captions into the picture. Viewers always see them, in any player or app: good for translations, episodes and social clips.
Questions
How do I embed subtitles into a video file?
Upload your video and subtitle file to SubEmbed, choose MKV or MP4 output, and download your video with soft subtitles embedded as a separate track. Viewers can toggle captions on or off in any compatible player.
What's the difference between embedding and burning subtitles?
Embedding subtitles keeps them as a separate track that viewers can turn on or off, while burning permanently draws them onto the video pixels. Embedded subtitles are more flexible — ideal for films, courses, and accessibility.
Is SubEmbed free?
Yes. Add subtitles to videos up to 100MB for free: 3 videos a day with no signup, or 5 a day with a free account, with no watermark. Pro adds files up to 2GB, unlimited videos and AI subtitles for your whole video. Your files are automatically deleted after 60 minutes for privacy.
What subtitle formats does SubEmbed support?
SubEmbed supports SRT, VTT, and ASS subtitle formats. You can also use AI-powered transcription to generate subtitles automatically, or type them manually with the built-in editor.
Can I add subtitles to MKV without re-encoding?
Yes. SubEmbed muxes the subtitle track into your video container without re-encoding the video or audio streams, so the process is fast and there is no quality loss.
Is SubEmbed a free online alternative to MKVToolNix?
Yes. SubEmbed runs in your browser — no desktop software to install. It handles the same subtitle muxing that MKVToolNix does, but with a simpler drag-and-drop interface and AI transcription built in.