Convert SRT to EBU-STL
Turn SRT subtitles into EBU-STL binary files — GSI header, TTI blocks, and ISO 6937 accented characters, ready for European delivery specs.
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Drop files here
Drag & drop or browse · SRT files
up to 3 files · 10.2 KB each
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How to convert SRT to STL
Convert SRT to STL online. CutConvert encodes your SRT subtitles as a binary EBU-STL file (EBU Tech 3264) — the subtitle exchange format European broadcasters require — with a proper GSI header, TTI subtitle blocks, and ISO 6937 accented characters.
Add your SRT file
Drag the .srt onto the drop zone. Lines are wrapped to 40 characters and up to 4 rows, the EBU limits.
Convert SRT to EBU-STL
Press Convert. Each cue becomes a TTI block with 25 fps timecode; accented characters are encoded as ISO 6937 combining sequences, and long subtitles chain across extension blocks.
Download your result
Download the converted file instantly — or a single ZIP archive when you convert a batch of files.
SRT file and EBU-STL subtitles, explained
EBU-STL is a 1990s binary format that refuses to die: European broadcasters, playout systems, and archives still require it. This converter writes the real thing — 1024-byte GSI header with subtitle counts and timecodes, 128-byte TTI blocks, centered justification, and the ISO 6937 character model where é is a combining acute followed by e. Output is verified by round-trip through our own decoder, which itself is verified against IRT’s (the German broadcast research institute) reference conversion pipeline.
Turn SRT subtitles into EBU-STL binary files — GSI header, TTI blocks, and ISO 6937 accented characters, ready for European delivery specs. It is free to start, encrypted in transit, and converts a whole batch into one ZIP — sign in when you need large, high-volume jobs.
SRT to STL FAQ
What flavor of STL is produced?
STL25.01 (25 fps) open subtitles, Latin character table (CCT 00), centered, bottom-positioned — the common denominator European delivery specs accept. Teletext-specific control codes (boxing, colors) are not emitted.
Do accents and umlauts survive?
Yes — ä, ö, ü, ß, é, ç and the rest of the Latin ISO 6937 repertoire are encoded properly, accented letters as the format’s combining diacritic sequences. Characters outside the repertoire are transliterated or dropped with a warning.
Is this the same .stl as 3D printing files?
No — same extension, completely different format. EBU-STL is a broadcast subtitle file (it starts with a GSI header like "850STL25.01"); stereolithography .stl is a 3D mesh. The converter detects and rejects 3D files with a clear message.
My delivery spec says 30 fps STL — is that supported?
Encoding currently targets STL25.01, the dominant European variant. The decoder reads both STL25.01 and STL30.01. If you need 30 fps STL output, get in touch via the About page.
Is it free?
Free to try on short files (about 10 minutes of program). Full-length subtitle files need a one-time $7 pack or a paid plan.
Guides for this workflow
- What is an EBU-STL?Europe's broadcast subtitle format decoded: GSI and TTI blocks, the ISO 6937 accent model that breaks other tools, and converters for both directions.Read guide
- SCC vs MCC vs STLThe broadcast caption decision table: how to tell which format your delivery spec is asking for, what differs under the hood, and one SRT to all three.Read guide
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Why editors trust it
Free to start
Convert everyday batches for free. Create an account when you need large, high-volume jobs.
Batch in, one ZIP out
Drop up to 10 files at once and download a single tidy ZIP — or one file if that is all you need.
Made for editors
EDL, SRT, Avid caption TXT, and Premiere transcript JSON — with speakers, frame rates, and timecode handled the way post expects.
Secure by default
Files are encrypted in transit, converted on managed infrastructure, and never sold or shared.
Questions, answered
Where are my files processed?
Your files are uploaded over an encrypted (HTTPS) connection and converted on CutConvert’s servers, then handed straight back to you as a download. We never sell or share your media.
Is it free? Do I need an account?
Small, everyday batches are free to convert. For large or high-volume jobs you’ll create an account and upgrade — which keeps the free tier fast for everyone.
What do I get when I convert multiple files?
Drop several files and you get back one ZIP archive containing every converted file. Convert a single file and you simply get that one file — no unnecessary ZIP.
Which formats are supported?
You can convert EDL to CSV; SRT and VTT subtitles to each other and to plain text; SRT, TXT, and DOCX/DOC transcripts to Premiere Pro transcript JSON; SRT to Avid Media Composer caption TXT; and Premiere Pro .prtranscript exports to SRT, VTT, or text — with speaker labels preserved. More post-production formats are on the way.
Can I pick a frame rate?
Yes. For EDL and Avid caption output you can choose 23.976, 24, 25, 29.97, or 30 fps, or let CutConvert auto-detect it from your source.