English → Czech
To translate English subtitles to Czech, upload your .srt or .vtt file to SubLingo, set the target language to Czech, and download the file with every timecode preserved. Czech text tends to run about 10% longer than English, so lines that fit comfortably in English can overflow and may need re-breaking to stay under 42 characters. Czech uses háček and acute diacritics (č š ž ř ě á í), with ř being almost unique to it, so UTF-8 is required. Keep each line under 42 characters and a reading speed below 17 characters per second — the limit Netflix sets for Czech subtitles — and save the file as UTF-8 so every character survives the round trip.
Last updated: 2026-06-11
Drop your subtitle file here, or click to browse
Supports .srt, .vtt, and .ass / .ssa
Drop in your English .srt or .vtt file. SubLingo parses every cue and locks the timings in place.
Set the target language to Czech. The source is auto-detected, so you can leave it on English or let it detect.
Run the translation. Only the text inside each cue is rewritten in Czech — never the timecodes.
Download the Czech subtitle file in the same format you uploaded, ready to drop straight onto your video.
Translating from English into Czech: Czech text tends to run about 10% longer than English, so lines that fit comfortably in English can overflow and may need re-breaking to stay under 42 characters. Czech uses háček and acute diacritics (č š ž ř ě á í), with ř being almost unique to it, so UTF-8 is required. Because SubLingo rewrites only the text inside each cue, every timecode from the original English file carries over to the Czech version unchanged.
Need the other direction? Translate Czech subtitles to English.
Netflix caps Czech subtitles at 42 characters per line and a reading speed of about 17 characters per second, across a maximum of two lines. SubLingo keeps the cue boundaries fixed, so you can re-break a long Czech line without touching the timing.
No. SubLingo translates only the subtitle text, so every start and end time is preserved exactly. Your Czech subtitles stay frame-accurate against the original video.
Yes. Both WebVTT (.vtt) and SubRip (.srt) English files are supported, including multi-line cues. The output keeps the same format you uploaded.
Yes. You can translate a English subtitle file to Czech in your browser for free, with no signup and nothing to install.
You can try it for free with no account. Upload your English file, translate to Czech, and download the result.
Most English subtitle files translate to Czech in a few seconds. Longer files with thousands of cues take a little more, but you stay on the page the whole time.
Typical movie and episode subtitle files — a few hundred KB and a few thousand cues — translate without trouble. Very large files may take longer to process, but the timecodes still come back unchanged.