Fastsub
AI Translate

One transcript.
206 languages.

Translate subtitles and text without breaking timing, tone or line length. The timestamps stay where they are — the meaning moves.

SRT · ASS · VTT · TXT in, same formats out. 30 free minutes.

EN JA auto-detected source

00:04.00 → 00:07.20

Giraffes are herbivorous animals.

00:04.00 → 00:07.20

キリンは草食動物です。

1 cue · 34 characters timing locked
How it works

Four moves, one sitting.

1

Import a subtitle

Drop in SRT, ASS or VTT — or lift a transcript straight out of the subtitle generator. Timing comes along untouched.

2

Choose a target

Pick from 206 languages. Source detection handles mixed-language files, and you can override it per project.

3

Translate with timing intact

Cues keep their in/out points. Lines are re-wrapped so the target language never overflows the safe area.

4

Review side by side

Read source and target in parallel, edit a line, then export SRT, ASS, VTT or plain text.

The difference

A translator, not a word swap.

Machine output is only useful when the timing and the reading rhythm survive the trip.

Doing it by hand Fastsub
Turnaround Days per episode Minutes, while you review
Cost $8–15 per minute 1 credit per minute
Timing Re-timed by hand Cue points preserved
Line length Depends on the translator Enforced per language
Terminology Consistent if briefed Glossary applied every run
Who it is for

Same file. Every market.

Course creators

Ship the same lesson to five markets without re-cutting the video or re-burning captions.

Podcast networks

Translate episode transcripts overnight and publish localized show notes the next morning.

Global support

Keep help-centre articles and call transcripts aligned across every language you sell in.

Questions

Frequently Asked

Does translation keep the original timing?

Yes. Cue in/out points are copied from the source file, so the translated text appears in the same frame window. Only the text and its line wrapping change.

What if the target language needs more space?

Lines are re-wrapped to the reading speed and character budget of the target language. Where a sentence cannot fit comfortably, it is split into two cues rather than squeezed into one.

Which files can I bring in?

SRT, ASS and VTT subtitles, or plain text. File size is capped at 10 MB, which is far beyond a feature-length subtitle file.

Can I fix a translation afterwards?

Always. The editor shows source and target side by side. Edit any line and the export reflects it straight away — nothing is locked.

The audience is already global. Your captions should be too.

Translate one real episode and read both versions side by side. 30 free minutes to start.