Japanese → English
To translate Japanese subtitles to English, upload your .srt or .vtt file to SubLingo, set the target language to English, and download the file with every timecode preserved. English text tends to run about 120% longer than Japanese, so lines that fit comfortably in Japanese can overflow and may need re-breaking to stay under 42 characters. English uses the Latin alphabet with no diacritics, so it packs more words per line than most target languages. Keep each line under 42 characters and a reading speed below 20 characters per second — the limit Netflix sets for English 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 Japanese .srt or .vtt file. SubLingo parses every cue and locks the timings in place.
Set the target language to English. The source is auto-detected, so you can leave it on Japanese or let it detect.
Run the translation. Only the text inside each cue is rewritten in English — never the timecodes.
Download the English subtitle file in the same format you uploaded, ready to drop straight onto your video.
Translating from Japanese into English: English text tends to run about 120% longer than Japanese, so lines that fit comfortably in Japanese can overflow and may need re-breaking to stay under 42 characters. English uses the Latin alphabet with no diacritics, so it packs more words per line than most target languages. Because SubLingo rewrites only the text inside each cue, every timecode from the original Japanese file carries over to the English version unchanged.
Need the other direction? Translate English subtitles to Japanese.
Netflix caps English subtitles at 42 characters per line and a reading speed of about 20 characters per second, across a maximum of two lines. SubLingo keeps the cue boundaries fixed, so you can re-break a long English line without touching the timing.
No. SubLingo translates only the subtitle text, so every start and end time is preserved exactly. Your English subtitles stay frame-accurate against the original video.
Yes. Both WebVTT (.vtt) and SubRip (.srt) Japanese files are supported, including multi-line cues. The output keeps the same format you uploaded.
Yes. You can translate a Japanese subtitle file to English in your browser for free, with no signup and nothing to install.
You can try it for free with no account. Upload your Japanese file, translate to English, and download the result.
Most Japanese subtitle files translate to English 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.