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Drop your SRT file here

or click to choose a file

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Subtitle size 66

IMPORTANT: ASS subtitle font size is fixed and cannot be changed in player settings. If the default size doesn't fit — adjust it here before converting.

Preview

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File downloaded!

Place the ASS file next to your video — the player will pick it up automatically.

Bionic Subtitles — SRT to ASS converter

A free online tool for turning regular SRT subtitles into ASS subtitles in a bionic reading style. The converter makes the beginning of each word bold, shows a quick preview and saves the result as a new ASS subtitle file.

How to use it

Upload or drop an SRT file into the converter.
Check the preview and adjust the subtitle size if needed.
Download the ASS file and place it next to your video.

Result example

Before: I need to finish this episode before tomorrow.

After: I need to finish this episode before tomorrow.

What happens to your file

The file is processed locally in your browser: subtitles are not uploaded to a server. Bionic Subtitles works as an SRT to ASS converter and a bionic reading subtitle converter for video creators, editors, podcasters and anyone who wants subtitles that are easier to scan quickly.