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.
Convert your files
Drop files here
Drag & drop or browse · SRT filesConverted in your browser. Files never leave your device.About an hour of footage is free. Larger files: $3 each, or Pro $9/month for everything up to 50 MB.
up to 2 files · 100 KB each
free to start · project to project: $5 · every other conversion: $3 · Pro $9/month · pricing
Converting as a guest. A free account has no monthly cap on files within the free size limit.
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 the reference conversion pipeline of IRT, the German broadcast research institute.
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 $3 conversion or a paid plan.
Guides for this workflow
- MacCaption alternativesFinal sale 2022, support ended May 2023, and the official successor is Windows-only. The real options, split by what you actually used MacCaption for.Read guide
- How we verify conversionsReferences we didn't write: reference decoders, published test corpora, property matrices, and independent implementations, documented format by format.Read guide
- 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
Convert a batch within your allowance and download a single ZIP, or one file if that is all you need.
Made for editors
Whole timelines from Premiere, Final Cut and Avid with transitions, markers, titles, keyframes, levels, nests and bins; captions that keep their italics, colour, placement and speakers across SRT, VTT, ASS, TTML, iTT, SCC and STL, any of them in, any of them out; transcripts into Premiere with the words the engine timed. Frame rates and timecode handled the way post expects.
Private by design
Files are converted in your browser. Queued files can be saved locally to restore your job after checkout. Conversion metadata helps us diagnose errors; file contents are not uploaded.
Questions, answered
Where are my files processed?
In your browser. The converter runs on your own machine and the file never leaves it; the site only records that a conversion happened. CutConvert never sees, stores, sells or shares your media.
Is it free? Do I need an account?
About an hour of footage per file is free, on every converter: 100 KB of subtitles or captions, 500 KB of Word transcript, 2 MB of transcript JSON, 1 MB of Resolve project, 5 MB of Final Cut XML, with Premiere projects and Avid AAF a little under the hour. Guests get five conversions a month, a free account has no monthly cap within those sizes, and above that project-to-project transfers are $5 per file. Every other conversion is $3, including project files to captions, reports or cut lists, and captions or transcripts into an editor. Pro is $9 a month ($90 a year) for every file type up to 50 MB; Studio is $19 a month ($190 a year) for files up to 500 MB. Paid-file access lasts 24 hours.
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 get that one file back, no ZIP. Tick extra formats under the output chips and the same ZIP carries every one of them, and a file counts as one conversion whatever it is written to.
Which formats are supported?
Timelines: Premiere .prproj, DaVinci Resolve .drp (as exported, or gzip- or Zstandard-wrapped), Avid AAF and Final Cut FCPXML in; FCP7 XML, FCPXML, Resolve .drp, CMX 3600 EDL and shot-list CSV out. A Premiere or Final Cut edit travels with its transitions, markers, titles, opacity and scale keyframes, clip volume, speed changes, nested sequences, bins, audio channel routing and each file's own frame rate, wherever the output has a place for them; an Avid AAF brings its transitions, markers, clip levels with their keyframes, muted tracks, nested stacks and each clip's own rate. Captions and transcripts, read and written: SRT, WebVTT, SBV, ASS, TTML, DFXP, iTT, SCC, MCC (a second 608 channel comes out as its own file), EBU-STL, Avid caption TXT, CapCut drafts of any size, timed CSV, Word, plain text, Whisper, WhisperX, AssemblyAI, Deepgram, Rev.ai and CapCut JSON, TwitchDownloader chat logs as a chat replay, Premiere transcript JSON and .prtranscript, Rev, Otter and Word-style transcripts, with italics, colour, placement and speakers kept where the output can hold them and measured word timing into Premiere. EDLs become event CSV reports. The capability table lists what every pair keeps.
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.