Are my ASS 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 ASS to SUB 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 ASS to SUB lose quality?

ASS and SUB describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent. Positioning, fonts and effects are dropped; only the text and its timing survive.

Do I need to install anything to open SUB files?

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

ASStoSUB

Convert ASS to SUB

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

You can convert ASS to SUB free and without an account: drop the file above and the SUB 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 ASS and SUB are for

Subtitles with positioning, fonts and effects. Standard in anime fansubbing.

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

How to convert ASS to SUB

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

ASS vs SUB: what changes

ASS compared with SUB
	ASS	SUB
Full name	Advanced SubStation Alpha	MicroDVD Subtitle
File extension	.ass, .ssa	.sub
Media type	text/x-ssa	text/plain

Quality: The result is a close reconstruction rather than an exact copy. Check it before relying on it.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.
What can be lost: Positioning, fonts and effects are dropped; only the text and its timing survive.

ASS to SUB: common questions

Are my ASS 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 ASS to SUB 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 ASS to SUB lose quality?: ASS and SUB describe content in fundamentally different ways, so the conversion is a reconstruction rather than a copy. The result is faithful, but not byte-for-byte equivalent. Positioning, fonts and effects are dropped; only the text and its timing survive.
Do I need to install anything to open SUB files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the SUB afterwards needs whatever software normally handles MicroDVD Subtitle on your device.