CaptionStack
Private by design

TXT TO SBV

TXT to SBV.

Convert Plain text (.txt) subtitles to YouTube SBV (.sbv) in seconds. No upload, no sign-up, nothing leaves your browser.

SRTVTTSBVLRCTTMLJSONCSVTXT
1

Choose your caption file

We’ll detect the format automatically. Drop several files to convert them all at once.

Don’t have a file handy?
2

Choose an output format

Select what you need on the other side.

100% privateYour files never leave this device.
8 formatsBuilt for the caption formats you use.
No limitsConvert as often as you need.

How to convert TXT to SBV

  1. Drop your .txt file into the converter above, or click to browse. Several files at once become a ZIP.
  2. Check the quality report and fix timing or text in the editor if you need to.
  3. SBV is already selected as the output format. Click Download converted file.

Conversion happens entirely in your browser. Nothing is uploaded, no account is needed, and there is no file count limit.

About Plain text (.txt)

A plain-text transcript is what you want for blog posts, show notes, accessibility documents, or feeding text into a search index or language model. CaptionStack strips all timing and writes each cue as its own paragraph. Importing a .txt file assigns three-second cues so you can add real timing in the editor.

About YouTube SBV (.sbv)

SBV files come from YouTube’s caption editor and its legacy download option. Each cue is just a timing line such as 0:00:01.000,0:00:04.200 followed by the text, with no sequence numbers or header, which makes them small but poorly supported outside YouTube.

What changes when converting TXT to SBV

SBV stores timing and text only, so converting to SBV drops cue identifiers. Converting from SBV is lossless.

Frequently asked questions

Is this TXT to SBV converter free?
Yes. CaptionStack is free and open source, with no limits on file count or conversions.
Are my caption files uploaded anywhere?
No. Parsing and conversion run in your browser using a local Web Worker. Your files never leave your device.
Can I edit the captions before exporting to SBV?
Yes. After import, open the editor to adjust start and end times, fix text, split, merge, or reorder cues. The quality report flags overlaps, short cues, and fast reading speeds with one-click fixes.
Can I convert many .txt files to .sbv at once?
Yes. Drop multiple files and download all of the results as a single ZIP archive.

Other TXT conversions

Other ways to get SBV

All caption formats