Turn ASS subtitles into EBU-STL. It is converted in your browser, so the file never leaves your device.
Drop ASS files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · several at once0 bytes uploaded, ever
Drop ASS (SSA, SubStation Alpha) 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 EBU-STL, or download everything as one ZIP if you converted several files.
The ASS to EBU-STL 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.
ASS styling is not understood by simple players, and it is lost when converting to plain formats. EBU STL is the file European broadcasters ask for when subtitles are delivered with a programme. ASS is at home in anime and karaoke subtitles with fonts, colours and positioning; EBU-STL is the usual choice for subtitles delivered to European broadcasters.
The text is read as UTF-8 or UTF-16, whichever the file is. An older file in another code page is read using the charset it declares, or as Windows-1252 if it declares none, so accented letters in an unlabelled legacy file can come out wrong. A file that is not text, such as the picture-based subtitles of a DVD, is refused instead of being converted to nonsense. 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. Each line takes its italic, bold, underline and alignment from its style and from override tags; drawing commands and karaoke effects are ignored. The file is written as STL25.01 in the Latin character set, 25 frames per second, with italics, underline, line breaks, position and justification. Characters outside the character set become a question mark.
ASS 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 converterEBU 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 converter| ASSASS/SSA subtitles | EBU-STLEBU STL subtitles | |
|---|---|---|
| Stands for | Advanced SubStation Alpha | EBU Subtitling data exchange format (STL) |
| Type | Styled subtitles | Subtitles |
| Compression | None | None (binary) |
| Introduced | The 2000s, by the SubStation Alpha program and the Aegisub community | 1991, by the European Broadcasting Union |
| Opens in | VLC, mpv, Aegisub and most fan-subtitling and media-server software; not browsers | Broadcast subtitling systems, Subtitle Edit, Premiere Pro and DaVinci Resolve |
| Best for | Anime and karaoke subtitles with fonts, colours and positioning | Subtitles delivered to European broadcasters |
| File extension | .ass, .ssa | .ebustl |
No. The ASS to EBU-STL 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: EBU-STL 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 ASS file, press Convert and save the EBU-STL. 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.