Japanese SRT Translator
Send an .srt file, get it back in Japanese within 24 hours — same cue count, same timestamps, nothing shifted.
Check your Japanese .srt before you pay anyone
Drop a subtitle file below. It runs entirely in your browser — nothing is uploaded, nothing leaves your machine. You get the cue count, the worst reading speeds, the lines that are too long for Japanese, and a corrected .srt you can download and keep whether or not you ever buy anything.
Drop your .srt here, or click to choose
.srt and .vtt · checked against 9 characters/second and 16 characters/line
Why Japanese subtitles specifically
Japanese audiences consume an enormous volume of subtitled foreign content, and Japanese creators publish heavily to global platforms. Both directions need Japanese .srt files, and both are usually done badly.
The part most tools get wrong
Japanese is double-byte: one full-width character occupies roughly twice the horizontal space of a Latin character. A 42-character Latin cue becomes about 21 Japanese characters, and most machine output is either far too long to fit or so terse that it reads as stuttering.
That is why this is not a one-click converter. Every file goes through machine translation first, then a manual pass on cue length, line breaks and reading speed before it reaches you.
Reading speed in Japanese
Japanese is measured in characters, not letters: about 9 full-width characters per second is the comfortable ceiling, with 16 characters per line across two lines. Counting this by eye is impossible, which is precisely why the checker above exists.
Japanese subtitle conventions most converters ignore
- No spaces between words — any converter that inserts word spacing has produced something unreadable.
- Punctuation is full-width: “。” and “、”, not “.” and “,”.
- Line breaks belong at particle boundaries, never mid-word — a purely character-count wrap will cut phrases in half.
What you get back
- The same number of cues, in the same order, with the same cue numbers.
- Timestamps untouched — only the text between the timing lines is replaced.
- Line breaks re-cut for Japanese reading speed, not inherited from English.
- A file that opens in VLC without a single warning.
That button opens your own email app. If nothing happens when you click it, just write to gwdaeoi@outlook.com and attach the file — same thing, no account, no form.
Questions
Is the checker really free?
Yes, and it does not upload your file anywhere. It parses the subtitle locally in your browser, reports what is wrong, and hands you back a corrected .srt. If that is all you needed, take the file and go.
How long does one file take?
Under 24 hours for anything up to 60 minutes of runtime. A full season is usually 3–5 days depending on how many languages you need.
Can you match an existing Japanese subtitle style?
Yes — send one episode you already like and I will match its capitalisation, punctuation and line-break habits across the rest.
What if the timing is off?
It will not be, because timestamps are never regenerated. If a specific cue still plays wrong, tell me the cue number and it gets fixed the same day.
Do you keep my files?
No. The original and the translation are deleted 24 hours after delivery.