> ## Documentation Index
> Fetch the complete documentation index at: https://hyperlocalise.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Translate SRT subtitle files with Hyperlocalise

> Translate SubRip cue text while preserving subtitle numbers and timing.

SubRip (SRT) subtitle files contain numbered cues with timestamps and text. Hyperlocalise translates cue text while retaining timings; it does not retime subtitles for a different reading speed.

Supported extensions: `.srt`.

## Source file

Save this example as `locales/en-US/messages.srt`.

```text theme={null}
1
00:00:01,000 --> 00:00:04,000
Welcome to the product tour.

2
00:00:05,000 --> 00:00:08,000
Open your project to begin.
```

## Configure your files

Use this `i18n.yml` for the example, or add its file mapping to your existing bucket.
See [path templates](/cli/configuration/path-templates) for other layouts.

```yaml theme={null}
locales:
    source: en-US
    targets:
        - es-ES

buckets:
    messages:
        files:
            - from: locales/en-US/messages.srt
              to: locales/{{target}}/messages.srt

llm:
    profiles:
        default:
            provider: openai
            model: gpt-5.2
```

## Translate

[Install the CLI](/cli/getting-started/install) and set `OPENAI_API_KEY` in your
project's `.env.local` or shell. You can also configure another
[AI provider](/cli/providers/overview).

```bash theme={null}
hyperlocalise run --dry-run
hyperlocalise run
```

The dry run previews the work. The second command writes translations to the
configured target path and updates the lockfile.

## Behavior and limitations

* Each cue is one translation unit, including multiline text. Keys are sequential, such as `srt.0001`.

* Cue numbers, timestamps, and positioning remain unchanged. Timing is supplied as translation context.

* Writeback replaces cue text. Extra keys are ignored, and blank lines inside translated text are removed to avoid creating new cues.

* Review subtitle length and reading speed separately; translation does not retime your video.

## Next steps

* [Check translations](/cli/commands/check) before committing generated files.
* [Local translation workflow](/cli/workflows/local-generation) explains repeat runs.
* [Browse all file formats](/cli/reference/formats/overview).

## Related formats

* [WebVTT subtitle](/cli/reference/formats/webvtt)