Free caption converter

Free online caption converter for SRT, VTT, and more

Convert for your platform — then optionally download CaptionPass enhanced formatting with a full QA report.

Convert & fix free Why not a generic converter?

Upload-ready export

Vendor and platform rules for your destination — what you expect from a caption converter, with timing repair and overlap trim included.

CaptionPass enhanced (optional)

Same run, second download — wrap, line length, and reading-speed targets when your preset supports a distinct enhanced export.

Supported formats

SRT
WebVTT
SBV
ASS
TTML
CaptionPass JSON IR

Delivery presets

YouTube
TikTok
HTML5
LMS/TTML
Generic safe

Format-specific converters

FAQ

Is CaptionPass a free caption converter?: Yes. The public tool at captionpass.com/#tool converts SRT, WebVTT, SBV, ASS, TTML, and CaptionPass JSON IR with no account required (5 successful runs per UTC day per network IP).
Is there a free SRT to VTT converter online?: Yes. Upload an SRT file, pick a delivery preset (HTML5 for WebVTT, YouTube, TikTok, or generic), and download upload-ready output. CaptionPass adds a WEBVTT header, fixes timestamps, and returns an explainable QA report.
What is the difference between upload-ready and CaptionPass enhanced?: Upload-ready follows vendor/platform rules for your destination (YouTube, TikTok, HTML5, etc.). CaptionPass enhanced optionally applies wrap, line length, and reading-speed targets in the same run — you get two downloads and one QA report.
Does the free converter store my files?: No. The public converter processes uploads in memory for the request only. Files are not persisted on disk or in a database.
How is this different from a generic subtitle converter?: Generic converters swap extensions without explaining failures. CaptionPass validates and repairs for delivery — overlap trim, platform presets, and named fix traces you can send to a client or producer.

Free caption converter

Upload a subtitle file, pick a delivery preset, and download upload-ready export — plus optional CaptionPass enhanced formatting. One run, two downloads, full QA report.

FAQ

Is CaptionPass a free caption converter?

Yes. The public tool at captionpass.com/#tool converts SRT, WebVTT, SBV, ASS, TTML, and CaptionPass JSON IR with no account required (5 successful runs per UTC day per network IP).

Is there a free SRT to VTT converter online?

Yes. Upload an SRT file, pick a delivery preset (HTML5 for WebVTT, YouTube, TikTok, or generic), and download upload-ready output. CaptionPass adds a WEBVTT header, fixes timestamps, and returns an explainable QA report.

What is the difference between upload-ready and CaptionPass enhanced?

Upload-ready follows vendor/platform rules for your destination (YouTube, TikTok, HTML5, etc.). CaptionPass enhanced optionally applies wrap, line length, and reading-speed targets in the same run — you get two downloads and one QA report.

Does the free converter store my files?

No. The public converter processes uploads in memory for the request only. Files are not persisted on disk or in a database.

How is this different from a generic subtitle converter?

Generic converters swap extensions without explaining failures. CaptionPass validates and repairs for delivery — overlap trim, platform presets, and named fix traces you can send to a client or producer.