Convert an SRT subtitle file to the ASS/SSA format locally - with a valid default style as a starting point. No upload.
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No re-upload neededThese tools accept .ASS - your file is handed over directly.
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
ASS (Advanced SubStation Alpha) is the format of choice when subtitles should do more than just show text: custom fonts, colours, positions and effects. Many subtitles, however, exist as plain SRT. This tool lifts your SRT file into a valid ASS structure, giving you the ideal starting point to style it in Aegisub or another ASS editor.
The tool reads the timings and text of your SRT file and writes a complete ASS file: with [Script Info], a default style in the [V4+ Styles] section and one Dialogue line per subtitle in the [Events] section. Multi-line subtitles are mapped correctly with the ASS line break (\N). Times are output in hundredths of a second, as ASS expects.
The conversion runs entirely locally in your browser in pure JavaScript - the file is not uploaded and no foreign library is loaded from a CDN. If the tool finds no valid timestamps, it stops with a clear message instead of producing an empty file.
| Input formats | SRT |
|---|---|
| Auto-conversion | MP4 |
| Output format | ASS |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Produces an ASS file with a single default style (Arial, white) - it is the basis for further editing, not already styled. You add custom fonts, colours and positions afterwards in an ASS editor. The tool converts, it does not translate into another language.
No. The conversion runs entirely locally in your browser; the file never leaves your device.
No. It contains a plain default style as a starting point; you add font, colour and position in an ASS editor such as Aegisub.
Yes. The start and end time of each subtitle is carried over (rounded to hundredths of a second), and multi-line subtitles stay multi-line.
Yes, there is the sibling tool "Convert ASS to SRT" for that.
ASS to SRT · Convert SRT to VTT · Convert VTT to SRT · SRT to TTML · SRT to SBV