CaptionStack
Private by design

TXT TO SRT

TXT to SRT.

Convert Plain text (.txt) subtitles to SubRip (.srt) 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 SRT

  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. SRT 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 SubRip (.srt)

SRT files are plain text: a sequence number, a start and end time written as HH:MM:SS,mmm, and one or more lines of caption text. Almost every video player, editing suite, and social platform accepts SRT, which makes it the safest interchange format when you are not sure what a tool supports.

What changes when converting TXT to SRT

SRT carries timing and text only. Styling, positioning, and speaker metadata from richer formats are dropped; cue identifiers are replaced with sequence numbers.

Frequently asked questions

Is this TXT to SRT 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 SRT?
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 .srt at once?
Yes. Drop multiple files and download all of the results as a single ZIP archive.

Other TXT conversions

Other ways to get SRT

All caption formats