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SRT to ASS

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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      Is my file uploaded?

      No. Everything runs in your browser - your file never leaves your device. How this is verifiable

      No upload100% local
      Your content stays with youno third-party access
      Servers in GermanyGDPR by design
      Independently auditedTLS A+ · HTTP headers A+

      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.

      Specifications

      Specifications
      Input formatsSRT
      Output formatASS
      Batch processingNo
      ProcessingLocally in your browser (JavaScript)
      File uploadNone

      In 3 steps

      1. Drop the .srt file.
      2. A valid ASS file with a default style is produced.
      3. Download the .ass file.

      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.

      FAQ

      Is the file uploaded?

      No. The conversion runs entirely locally in your browser; the file never leaves your device.

      Is the ASS file already styled?

      No. It contains a plain default style as a starting point; you add font, colour and position in an ASS editor such as Aegisub.

      Are timings and lines kept?

      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.

      Does it work the other way too?

      Yes, there is the sibling tool "Convert ASS to SRT" for that.

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