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CutConvert
Post-production file converter

Convert EBU-STL to SRT

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

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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) — GSI header, TTI blocks, teletext control codes, and the ISO 6937 character set — into clean, numbered SRT subtitles you can edit or upload anywhere.

  1. Add your STL file

    Drag the .stl onto the drop zone. STL25.01 and STL30.01 formats are read; 3D-printing .stl models are politely rejected.

  2. Convert STL to SRT

    Press Convert. Subtitle blocks are decoded — extension-block chains reassembled, comment blocks skipped, teletext codes stripped, combining accents composed — with frame-accurate timing.

  3. Download your result

    Download the converted file instantly — or a single ZIP archive when you convert a batch of files.

EBU-STL file and SRT subtitles, explained

An EBU-STL file is binary: a 1024-byte header followed by fixed-size subtitle blocks whose text uses ISO 6937, where accented letters are stored as two bytes (combining accent + base letter). This converter decodes all of it — including umlauts, ß, and the teletext control bytes that other tools leave as garbage — and writes standards-compliant SRT. Decoding is verified cue-for-cue against the reference conversion pipeline published by IRT, the German broadcast research institute: identical text and frame-exact timing on a real broadcast file.

Decode binary EBU-STL subtitle files into clean, timed SRT — full ISO 6937 character set 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 (diaeresis + u = ü) and this decoder composes them properly, verified against a German-language broadcast file including ß.

What happens to subtitler comments in the file?

STL files can carry comment blocks (notes between subtitlers) that are not meant for air. They are skipped, and a warning tells you how many were 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 $7 pack or a paid plan.

Guides for this workflow

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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.