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Convert SRT to EBU-STL

Turn SRT subtitles into EBU-STL binary files with a GSI header, TTI blocks and ISO 6937 accents for European delivery specs.

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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. The file has a proper GSI header, TTI subtitle blocks and ISO 6937 accented characters.

  1. Add your SRT file

    Drag the .srt onto the drop zone. Lines wrap to the EBU limits of 40 characters and 4 rows.

  2. 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.

  3. Download your result

    Download the converted file, or one ZIP when you convert a batch.

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, with a 1024-byte GSI header holding subtitle counts and timecodes, 128-byte TTI blocks and centered justification. It follows the ISO 6937 character model, where é is a combining acute followed by e. We check output by round-trip through our own decoder. That decoder matches the reference conversion pipeline of IRT, the German broadcast research institute.

Turn SRT subtitles into EBU-STL binary files with a GSI header, TTI blocks and ISO 6937 accents 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 with the Latin character table (CCT 00), centered and bottom-positioned. European delivery specs accept this common denominator. Teletext-specific control codes such as boxing and 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, with accented letters stored 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. The extension is the same, but the format is completely different. EBU-STL is a broadcast subtitle file that starts with a GSI header like "850STL25.01". Stereolithography .stl is a 3D mesh. The converter detects 3D files and rejects them with a clear message.

My delivery spec says 30 fps STL. Is that supported?

Encoding 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 $3 conversion or a paid plan.

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Questions, answered

Where are my files processed?

In your browser. The file never leaves your computer, and CutConvert only records that a conversion happened. We never see, store, sell or share your media.

Is it free? Do I need an account?

Files up to about an hour of footage convert free on every converter. CapCut projects are free up to 500 KB. Guests get five conversions a month; a free account has no monthly cap within the free size caps. Bigger files are $3 each, or $5 for a project conversion from one program to another. Pro is $9 a month ($90 a year) for files up to 50 MB. Studio is $19 a month ($190 a year) for files up to 500 MB.

What do I get when I convert multiple files?

One ZIP with every converted file. A single file comes back on its own. Press + to add more output formats: they go in the same ZIP, and each file still counts as one conversion.

Which formats are supported?

Projects in: Premiere .prproj, DaVinci Resolve .drp, Avid AAF and bins, Final Cut FCPXML, CapCut drafts and Audition sessions. Projects out: FCP7 XML, FCPXML, Resolve .drp, AAF, CapCut and REAPER, plus CMX 3600 EDL and shot-list CSV. Transitions, markers, titles, keyframes, levels, speed changes and nested sequences carry over wherever the target app can hold them. Captions: SRT, WebVTT, SBV, ASS, TTML, DFXP, iTT, SCC, MCC, EBU-STL, Avid caption TXT, timed CSV, Word and plain text. Transcripts: Whisper, WhisperX, AssemblyAI, Deepgram, Rev.ai and CapCut JSON, Premiere transcript JSON and .prtranscript, and Rev, Otter and Word-style text. Styling, placement and speakers come along where the output supports them.

Can I pick a frame rate?

Yes. For EDL and Avid caption output, choose 23.976, 24, 25, 29.97 or 30 fps, or let CutConvert detect it from your source.