Turn EBU-STL subtitles into ASS. It is converted in your browser, so the file never leaves your device.
Drop EBU-STL files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · several at once0 bytes uploaded, ever
Drop EBU-STL (STL, Tech 3264) files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert. There is nothing else to set. The work happens in this tab.
Save the ASS, or download everything as one ZIP if you converted several files.
The EBU-STL to ASS converter is part of this page and runs inside your browser. Your subtitles are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
EBU STL is a binary file that web players and most consumer apps cannot read. ASS gives full control over how subtitles look. EBU-STL is at home in subtitles delivered to European broadcasters; ASS is the usual choice for anime and karaoke subtitles with fonts, colours and positioning.
Of the styling, only italic, bold, underline and the position on screen (top, middle or bottom, left, centre or right) travel between formats; fonts, colours, outlines and effects do not. Only Latin-alphabet EBU STL files are read. Colours, boxes and double-height text are dropped; italics, underline, line breaks, position and justification are kept, and times are shifted back by the programme start the header declares. The file is written with a single Default style (Arial, white with a black outline) that the player or Aegisub can restyle, and times are rounded to hundredths of a second, the precision ASS has.
EBU STL, defined in EBU Tech 3264, is the binary subtitle file of European broadcasters: a 1024-byte header followed by 128-byte blocks, each holding the in and out timecodes, position, justification and teletext-style text of one subtitle. It is usually named .stl, which is also the extension of 3D printing files, so ToAny tells them apart by the header inside.
Opens in Broadcast subtitling systems, Subtitle Edit, Premiere Pro and DaVinci Resolve
EBU-STL converterASS adds styles to subtitles: fonts, colours, outlines, shadows, exact screen positions and animation effects. Fan-subbed anime and karaoke use it heavily. SSA is the earlier version, and the .ssa extension is read as the same format.
Opens in VLC, mpv, Aegisub and most fan-subtitling and media-server software; not browsers
ASS converter| EBU-STLEBU STL subtitles | ASSASS/SSA subtitles | |
|---|---|---|
| Stands for | EBU Subtitling data exchange format (STL) | Advanced SubStation Alpha |
| Type | Subtitles | Styled subtitles |
| Compression | None (binary) | None |
| Introduced | 1991, by the European Broadcasting Union | The 2000s, by the SubStation Alpha program and the Aegisub community |
| Opens in | Broadcast subtitling systems, Subtitle Edit, Premiere Pro and DaVinci Resolve | VLC, mpv, Aegisub and most fan-subtitling and media-server software; not browsers |
| Best for | Subtitles delivered to European broadcasters | Anime and karaoke subtitles with fonts, colours and positioning |
| File extension | .ebustl | .ass, .ssa |
No. The EBU-STL to ASS conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
No further quality is lost: ASS stores the decoded audio exactly. The result is identical in content.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the EBU-STL file, press Convert and save the ASS. There is nothing to install.
Yes, but a subtitle file is small. Files up to 50 MB are accepted, far more than any real subtitle file. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.