EBU STL Converter

Convert subtitle files free in your browser. No sign-up, no upload.

Free
No sign-up
Never uploaded
No watermark

Drop files here

or click to browse · paste with Ctrl+V

Files stay on your device. Nothing is uploaded.

Plain text (TXT), SubRip (SRT), WebVTT (VTT), Advanced SubStation Alpha (ASS) and 7 more

Ctrl+V to paste · Ctrl+Enter to convert all

Free EBU STL Converter: No Sign-up, Files Never Uploaded

This free EBU STL converter runs entirely on your device. You do not need an account or a login, and your files are never uploaded, so they never leave your browser.

EBU STL in short. Binary subtitle format defined by the European Broadcasting Union for TV. Not related to the 3D STL format that shares the extension.

From EBU STL you can convert to SRT, VTT, ASS, SSA, SBV and SUB, and 5 more formats. These pairs run on code already in the page, with no extra engine to download.

EBU STL is a source format here. EBU STL is a broadcast format that is read only here; convert it to SRT or VTT.

Free
No sign-up
Never uploaded
No watermark

Your files are converted on your device and never uploaded.

Back to the converter

How to convert

Add your EBU STL files by dragging them onto the converter or by using the file picker.
Choose the format you want from the list of targets that fit your file.
Open the options if you want to change quality or size, or keep the defaults.
Press Convert and watch the progress shown for each file.
Download each result, or take them all together as one ZIP when you converted several files.

Features

Reads .stl files.
Free, with no watermark added to the result.
No sign-up and no login.
Your files are never uploaded and never leave your device.
Batch conversion with a ZIP download for several results.
The input is recognised by its content, not only by its file name.
11 target formats to choose from.

Supported formats

Subtitle formats
Format	Read	Write	Notes
Plain text (TXT).txt	Yes	Yes	Unformatted text with no styles, images or layout.
SubRip (SRT).srt	Yes	Yes	The simplest and most common subtitle format: numbered cues with start and end times.
WebVTT (VTT).vtt	Yes	Yes	The W3C subtitle format used by the HTML video element.
Advanced SubStation Alpha (ASS).ass	Yes	Yes	Subtitles with rich styling, positioning and effects, common in anime fansubs.
SubStation Alpha (SSA).ssa	Yes	Yes	The original SubStation Alpha format that ASS extends.
YouTube captions (SBV).sbv	Yes	Yes	The caption format YouTube exports and accepts.
MicroDVD (SUB).sub	Yes	Yes	Frame-based subtitles: timing is given in video frames, not seconds.
Lyrics (LRC).lrc	Yes	Yes	Time-stamped song lyrics, shown line by line by music players.
TTML / DFXP.ttml	Yes	Yes	W3C Timed Text Markup Language: XML subtitles used by streaming services.
SAMI (SMI).smi	Yes	Yes	Synchronized Accessible Media Interchange, introduced by Microsoft.
EBU STL.stl	Yes	No	EBU STL is a broadcast format that is read only here; convert it to SRT or VTT.

About the formats

About EBU STL

Binary subtitle format defined by the European Broadcasting Union for TV.

Not related to the 3D STL format that shares the extension.

It does not support transparency.

What EBU STL can become

EBU STL to SRT runs in the page.

EBU STL to VTT runs in the page.

EBU STL to ASS runs in the page.

EBU STL to SSA runs in the page.

EBU STL to SBV runs in the page.

EBU STL to SUB runs in the page. Frame-based timing uses the frame rate you set.

EBU STL to LRC runs in the page.

EBU STL to TTML runs in the page.

Why EBU STL is read only

EBU STL is a broadcast format that is read only here; convert it to SRT or VTT.

Privacy: how it works

Your EBU STL files stay on your device. The page reads each file with the browser's file API, converts it with code running in the tab, and hands the result back as a download. No upload happens, so there is no copy of your file on our servers to protect, delete or leak.
There is nothing to sign up for and no login. The converter does not ask for an email address, and it does not need to know who you are to do its job.
You can check the claim yourself: open your browser developer tools, watch the Network tab while a file converts, and you will see no request that carries your file.

Tips

Open the result in your player to check that the timing still lines up.
Use UTF-8 for text encoding unless an older device needs something else.
Styling, colours and positions only survive between formats that support them.
Keep the original file in case you need the styling later.
EBU STL cannot be created here, so pick one of its targets instead.

Frequently asked questions

Is it really free?

Yes. There is no price, no trial, no credit card and no watermark added to your results. Ulkaa Tool does the conversion with your own device, so there is no server bill to pass on to you.

Are my files uploaded?

No. Your EBU STL files are read and converted inside your browser and are never sent to Ulkaa or to anyone else. The result is created on your device and you save it from there.

Do I need an account?

No. There is no sign-up and no login. Open the page, add your files and convert. An Ulkaa account is not needed for anything on this tool.

Is there a file size limit?

No limit is set by us. The real limit is your device: the conversion uses your own memory and processor, so very large files can be slow, and a very big batch may need to be split into smaller runs.

What can I convert EBU STL files to?

You can convert EBU STL to SRT, VTT, ASS, SSA, SBV, SUB, LRC, TTML, SMI, TXT and CSV. Pick one on the converter and it applies to every file you add.

Can I convert other files to EBU STL?

No. EBU STL is a broadcast format that is read only here; convert it to SRT or VTT.

Can I convert many EBU STL files at once?

Yes. Add as many files as your device can handle. Each one is converted on its own and you can download them one by one or as a single ZIP.

All subtitle conversions