ALTools

Add Subtitle to Video

Add subtitle tracks or burn subtitles into MP4 videos (supports TXT, SRT, VTT, ASS, and SBV).

How to use this tool — step-by-step guide

How Adding Subtitles to Video Works

Upload a video and a subtitle file in SRT, VTT, ASS, TXT, or SBV format. ALTools processes everything in your browser—no server upload and no account needed.

Choose a soft subtitle track muxed into the MP4 that viewers can toggle, or hard burn-in that renders captions into the video image. Burn-in re-encodes the video; soft subs keep text as a separate stream.

Make content accessible, guarantee captions on players without subtitle support, or deliver review copies with visible dialogue.

Local browser processing keeps unreleased films and client projects private. Preview timing before export when your workflow allows.

Download an MP4 with an embedded subtitle track or burned-in captions—ready to upload, share, or archive.

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Subtitle to SRT

Convert TXT, VTT, ASS, SBV, or SRT subtitles to standard SRT format. Fast, private, in your browser.

Frequently Asked Questions

Are subtitles burned into the video?

By default, subtitles are added as a selectable MP4 track. Turn on hard subtitle burn-in to render subtitles directly into the video image.

Which subtitle formats are supported?

TXT, SRT, VTT, ASS/SSA, and SBV are supported. The tool normalizes them before adding or burning subtitles.

Is my file uploaded?

No. Video and subtitle processing happen locally in your browser.