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Convert EBU-STL to SRT

Decode binary EBU-STL files into timed SRT. The full ISO 6937 character set works, including combining accents, at 25 or 30 fps.

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browseEBU-STL subtitle filesConverted in your browser. Files never leave your device.About an hour of footage is free. Bigger files: $3 a file, or Pro.

up to 2 files · 200 KB each

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How to convert STL to SRT

Convert STL to SRT online. CutConvert decodes binary EBU-STL subtitle files (EBU Tech 3264) into numbered SRT subtitles you can edit or upload anywhere. It handles the GSI header, TTI blocks, teletext control codes and the ISO 6937 character set.

  1. Add your STL file

    Drag the .stl onto the drop zone. The converter reads STL25.01 and STL30.01 and rejects 3D-printing .stl models.

  2. Convert STL to SRT

    Press Convert. Subtitle blocks decode with frame-accurate timing. The converter reassembles extension-block chains, skips comment blocks, strips teletext codes and composes combining accents.

  3. Download your result

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

EBU-STL file and SRT subtitles, explained

An EBU-STL file is binary. A 1024-byte header comes first, then fixed-size subtitle blocks whose text uses ISO 6937. In ISO 6937, each accented letter takes two bytes, a combining accent and then the base letter. This converter decodes all of it, including umlauts, ß and the teletext control bytes other tools leave as garbage. The output is standard SRT. We checked decoding cue for cue against the reference conversion pipeline published by IRT, the German broadcast research institute. A real broadcast file came out with identical text and frame-exact timing.

Decode binary EBU-STL files into timed SRT. The full ISO 6937 character set works, including combining accents, at 25 or 30 fps. 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.

STL to SRT FAQ

Which STL variants are supported?

STL25.01 (25 fps) and STL30.01 (30 fps), open or teletext subtitles, with the Latin character table. Non-Latin character tables (Cyrillic, Greek, Arabic, Hebrew) decode on a best-effort basis with a warning.

Do German umlauts and French accents decode correctly?

Yes. ISO 6937 stores them as combining sequences, so a diaeresis plus u gives ü. This decoder composes them correctly. We tested it on a German-language broadcast file that includes ß.

What happens to subtitler comments in the file?

STL files can carry comment blocks, notes between subtitlers that are not meant for air. The converter skips them, and a warning tells you how many it found.

How accurate is the timing?

TTI in-cues and out-cues are converted at the file's own frame rate. On the IRT reference file, every cue matched the published reference timing to the millisecond.

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.