# Subbing for YouTube Closed Captions

Typefacing and submission for YouTube closed captions require a very different process for everything. You will still be using Aegisub, albeit differently.

#### YTSubConverter

<span style="white-space: pre-wrap;">YouTube uses </span>`<span class="editor-theme-code">.ytt</span>`<span style="white-space: pre-wrap;"> files for advanced subtitle styling in the YouTube player and not </span>`<span class="editor-theme-code">.ass</span>`. Aegisub does not support this format, thus a converter is needed.

****YTSubConverter****<span style="white-space: pre-wrap;"> can be downloaded here: </span>[](https://github.com/arcusmaximus/YTSubConverter)[https://github.com/arcusmaximus/YTSubConverter](https://github.com/arcusmaximus/YTSubConverter)

[![image17.png](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/dnoh5KfD2KNzt1th-image17.png)](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/dnoh5KfD2KNzt1th-image17.png)

#### Sample Files

<span style="white-space: pre-wrap;">The program includes two sample ASS files to work with: </span>`<span class="editor-theme-code">sample1.ass</span>`<span style="white-space: pre-wrap;"> which is for traditional clip subbing, and </span>`<span class="editor-theme-code">sample2.ass</span>`<span style="white-space: pre-wrap;"> which focuses more on karaoke subbing.</span>

[![image8.png](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/9iifqB4BJnQnLj21-image8.png)](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/9iifqB4BJnQnLj21-image8.png)

<span style="white-space: pre-wrap;">For most of our subbing use cases, it’s recommended to take a look into </span>`<span class="editor-theme-code">sample1.ass</span>`<span style="white-space: pre-wrap;"> and see how you can implement proper typesetting with the presets.</span>

****This is how Aegisub stylings will be converted to YouTube’s stylings:****

[![image6.png](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/s1IzdkSRyE0N9srE-image6.png)](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/s1IzdkSRyE0N9srE-image6.png)

`<span class="editor-theme-code">sample1.ass</span>`<span style="white-space: pre-wrap;"> has most of these examples covered, so feel free to experiment with the styles from there, copy and modify them as you wish.</span>

#### YTT-specific tricks

<span style="white-space: pre-wrap;">YTSubConverter allows you to make use of different types of animation or effects regardless of the limitations of YouTube’s subtitle format. You can refer to the </span>[README](https://github.com/arcusmaximus/YTSubConverter/blob/master/README.md)<span style="white-space: pre-wrap;"> for specifics, but notable examples include </span>`<span class="editor-theme-code">{\ytshake}</span>`<span style="white-space: pre-wrap;"> and </span>`<span class="editor-theme-code">{\ytchroma}</span>`.

#### Conversion

<span style="white-space: pre-wrap;">Once your options are selected, click on </span>`<span class="editor-theme-code">Autoconvert</span>`<span style="white-space: pre-wrap;"> to turn your ASS into a YTT file.</span>

#### Testing

- <span style="white-space: pre-wrap;">You can test on </span>****PC****<span style="white-space: pre-wrap;"> in two ways: through Fiddler (explained in the readme, which requires existing video) or by uploading your private copy and uploading the YTT to it. (better for non-uploaded videos)</span>
- <span style="white-space: pre-wrap;">You can test on </span>****Android****<span style="white-space: pre-wrap;"> either with your phone or an Android emulator or compatibility layer such as BlueStacks, WSA, or Waydroid.</span>

#### Copying an existing video’s styling

YTSubConverter also allows reverse conversion, from YTT or SRV3 to ASS. This allows you to copy the style or make an edit to the YTT file easily. You may download the subtitle file through youtube-dl or by using the link in the README.

#### Limitations

Some things may not work on all devices, so keep that in mind. There are things that you may have to compromise when applying a style to work on mobile, so weigh your options. Do you want to keep things consistent or provide a better experience for those on PC? Your choice.

Positioning may be different in PC and mobile. Always test and compromise.

[![image3.png](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/KmGVXFuELAOCKri8-image3.png)](https://wiki.holoresorttls.org//uploads/images/gallery/2025-06/scaled-1680-/KmGVXFuELAOCKri8-image3.png)

<p class="callout info">I highly recommend taking a look at official subtitles from hololive production, especially the Holo no Graffiti series, as the subtitles are typeset in a way that can work for both desktop and mobile.</p>