SRT to ASS converter

Turn a plain SubRip .srt into an Advanced SubStation .ass file with a clean default style, ready to open in Aegisub or play with libass-based players.

100% private. Your files are processed locally in your browser and never uploaded to a server.

Drop your .srt file

or click to browse · converts to .ass instantly

Why convert SRT to ASS?

You convert this direction when you want control. ASS lets you set fonts, sizes, colours, outlines, margins and screen positions per line — none of which SRT can express. Starting from an SRT and converting to ASS gives you a correctly structured file with every cue timed and numbered, so you can open it in an editor like Aegisub and focus on styling instead of file plumbing.

What the converter writes

A complete, valid ASS document: the [Script Info] header, a [V4+ Styles] section with one sensible default style (white text, dark outline, bottom-centre), and an [Events] section with one Dialogue line per subtitle. Timing is converted from SRT's milliseconds to ASS centiseconds, and italic or bold tags in the SRT carry over as ASS override tags.

Good to know

ASS timing has centisecond resolution (0.01s), so timestamps are rounded by at most 5 milliseconds — imperceptible in practice. Players that don't support ASS styling will still show the text. If your goal is captions for a web page rather than styling, you want the SRT to VTT converter instead.

How to convert SRT to ASS

Drag your .srt file into the box above, or click to browse.
The file is converted to Advanced SubStation (.ass) instantly, in your browser.
Check the preview and any warnings, then click Download.

Is my file uploaded anywhere?

No. The conversion runs entirely in your browser using JavaScript. Your subtitle file is never sent to a server, there is no sign-up, and there is no limit on how many files you convert. Need the other direction? Use the ASS to SRT converter.

Other subtitle conversions

SRT → VTT VTT → SRT ASS → SRT SUB → SRT SRT → SUB SBV → SRT SRT → SBV SMI → SRT TTML → SRT LRC → SRT SRT → LRC All formats

Frequently asked questions

How do I convert SRT to ASS?

Drop your .srt file into the converter above and download the .ass file. It is written with a clean default style and is immediately valid in Aegisub, VLC and any libass-based player.

Can I style the subtitles after converting?

Yes, that is the point of ASS. Open the converted file in Aegisub (free) to change fonts, colours, outline, position and per-line effects. The converter gives you the correct file structure to build on.

Is the timing still accurate in ASS?

Yes. ASS stores time in centiseconds, so each timestamp may round by up to 5 milliseconds, far below anything a viewer can perceive. Text and order are preserved exactly.

Is the SRT to ASS converter free, and are my files uploaded?

It is completely free with no sign-up and no file limit. The conversion runs in JavaScript in your browser, so your subtitle file never leaves your device and nothing is stored on a server.

Auto-Sync to Reference Automatically retime a subtitle to match a correctly-synced one. Subtitle Editor Edit subtitle text and timings cue by cue, then export any format. Add Subtitles to Video Play your video with any subtitle file and fix the sync live. Subtitle Converter Convert between SRT, VTT, ASS/SSA, SBV, SUB, SMI, LRC and TTML. Text to SRT Generator Turn a plain-text transcript or script into a timed SRT file. Frame Rate Converter Rescale timings between frame rates to fix subtitles that drift. Encoding Repair Fix garbled subtitle characters by re-decoding them to UTF-8. Merge & Split Combine two SRT files into one, or split one file in two. Cleanup Tools Remove SDH/hearing-impaired tags, strip formatting, check CPS. Subtitle to Text Strip timecodes to get a clean transcript from any subtitle file.