Are my SUB files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.

Is converting SUB to VTT free?

Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.

Does converting SUB to VTT lose quality?

No. VTT stores the same content without discarding anything, so the result is identical in quality to the original.

Do I need to install anything to open VTT files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the VTT afterwards needs whatever software normally handles WebVTT on your device.

SUBtoVTT

Convert SUB to VTT

Up to 3 files at once, 100 with Pro. Mixed formats are fine.

You can convert SUB to VTT free and without an account: drop the file above and the VTT is ready to download in a second or two. The conversion happens inside your own browser, so the file is never uploaded — it works on Windows, Mac, Linux, iPhone and Android, and keeps working with the network switched off.

What SUB and VTT are for

Frame-based subtitles. Goes out of sync the moment the frame rate changes.

The subtitle format HTML5 video expects. SRT with a header and styling support.

How to convert SUB to VTT

Drop your SUB file onto this page, or click to pick one.
Choose VTT as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished VTT file.

SUB vs VTT: what changes

SUB compared with VTT
	SUB	VTT
Full name	MicroDVD Subtitle	WebVTT
File extension	.sub	.vtt
Media type	text/plain	text/vtt

Quality: Nothing is lost. The result holds exactly the same picture, text or data as the original.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.

SUB to VTT: common questions

Are my SUB files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.
Is converting SUB to VTT free?: Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.
Does converting SUB to VTT lose quality?: No. VTT stores the same content without discarding anything, so the result is identical in quality to the original.
Do I need to install anything to open VTT files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the VTT afterwards needs whatever software normally handles WebVTT on your device.