SRT to ASS/SSA Converter

You finished timing in a plain .srt file, but now the client wants branded subtitles — a specific font, a colored outline, lower-third positioning, maybe a karaoke effect for the song at the end. SRT cannot express any of that. ASS (Advanced SubStation Alpha) can, which is why editors like Aegisub and most soft-sub pipelines expect it.

The SRT to ASS/SSA Converter does the heavy lifting so you don't hand-rewrite a single timestamp. It maps SRT's millisecond timing to ASS's centisecond format, wraps every cue as a Dialogue: line under a default style, and converts your <i>/<b> tags into ASS override tags ({\i1}). The result drops straight into Aegisub or an MKV muxer ready for styling.

• Timestamp mapping: SRT HH:MM:SS,mmm becomes ASS H:MM:SS.cc automatically.
• Default style block: a ready [V4+ Styles] Default style (Arial 20, white, outlined) is written so the file just works.
• Tag conversion: <i>, <b>, <u> become {\i1}/{\i0}, {\b1}/{\b0}, {\u1}/{\u0}.
• Multi-line safe: wrapped subtitle lines are joined with real ASS line breaks.
• Header included: [Script Info] with PlayRes and Timer so players parse it correctly.
• One-click copy/download: grab the .ass or save it directly.
• Private: runs entirely in your browser, no uploads.

1. Paste your SRT into the box (sample data is preloaded — including an italic line — so you can test instantly).
2. Click Convert to ASS — the styled ASS appears on the right.
3. Copy or download the .ass and open it in Aegisub or mux it into your video.

Example 1 — Brand styling prep. You timed in SRT for speed, then convert to ASS so the post team can apply the house font and outline without retiming.

Example 2 — Karaoke lyrics. A music video needs syllable-timed karaoke; ASS is the only common format that supports it, so the SRT is converted first as the base.

Example 3 — Positioned soft-subs. You want subtitles pinned to the lower third with a shadow; ASS styling starts from this converted file.

• Styling-ready: unlock fonts, colors, outlines and positioning immediately.
• No manual rewrite: every timestamp is remapped for you.
• Tags preserved: emphasis from SRT carries over as ASS overrides.
• Editor-compatible: opens in Aegisub and most players without fixes.
• Private: subtitle text never leaves the browser.