twineconvert

free · in-browser · no upload

ASS to SRT
Converter

Drop your ASS file. We'll convert it to SRT right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .ass, .ssa

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a ASS from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your SRT the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert ASS → SRT

What this conversion is actually for

Most consumer video players (YouTube uploads, browser HTML5 video, hardware TVs, mobile players, basic Plex setups) only understand SRT. Converting ASS to SRT strips styling/positioning/karaoke effects but keeps the timing + dialogue text the audience actually reads — so your stylized fansub still plays on the recipient's device when ASS isn't supported.

A real example

You finished an Aegisub typesetting pass on `episode.ass`, but the friend who's watching has a smart TV that only does SRT subtitles via USB. Convert to `episode.srt`, drop on the USB stick, the TV picks it up.

Troubleshooting

I'm missing some lines that were in the ASS file.

ASS distinguishes `Dialogue:` lines (rendered captions) from `Comment:` lines (translator notes / karaoke source / disabled lines). Only Dialogue lines go into SRT — that's correct behavior. If important lines were marked as Comment by mistake, edit the .ass file in Aegisub and switch the row's class from Comment to Dialogue before re-converting.

Override codes like `{\fad(200,200)}` appeared as literal text.

Our converter strips standard inline overrides ({\i1}, {\b1}, {\fnArial}, etc.) but very long or malformed override blocks can sneak through. Open the resulting SRT and find/replace `{...}` blocks manually if any remain.

Formats involved

About ASS and SRT

ASS, Advanced SubStation Alpha

ASS (Advanced SubStation Alpha, sometimes spelled .ssa for its predecessor SubStation Alpha) is the styled-subtitle format used by Aegisub, fansubbed anime, and nearly every video player that supports advanced typesetting (VLC, MPV, mpv-style, IINA, PotPlayer). It's a section-based INI: `[Script Info]` for metadata, `[V4+ Styles]` for fonts/colors/positioning, `[Events]` for the actual `Dialogue:` lines. Captions can specify per-line styling, hard breaks (`\N`), inline override codes (`{\b1}bold{\b0}`, `{\i1}italic{\i0}`, `{\fnArial}font`), karaoke effects, and absolute screen positioning — none of which SRT or WebVTT express. Created in 2003; libass is the de-facto rendering engine across mpv, ffmpeg, and most modern players.

How to open

Aegisub is the canonical editor (free, all platforms). VLC, MPV, IINA, and PotPlayer render ASS overlays natively. ffmpeg can burn ASS into a video track or pass through as a soft subtitle stream. Any text editor opens .ass as plain UTF-8.

Full ASS format guide →
SRT, SubRip Subtitle

SRT is the simplest subtitle format: a numbered list of cues, each with a `HH:MM:SS,mmm --> HH:MM:SS,mmm` timestamp and one or more lines of caption text. Originated in 2001 from the SubRip ripping tool and became the universal default — every video player (VLC, MPV, mpv, every web video framework), every subtitle editor, and every video platform reads SRT.

How to open

Any text editor (it's just text). VLC autoloads `<videoname>.srt` if it's next to the video file. Subtitle editors like Subtitle Edit, Aegisub, and EditSubs provide visual timing tools.

Full SRT format guide →

Related tools

Convert other files to SRT

Convert your ASS to other formats

FAQ

Common questions

Is this ASS → SRT converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert ASS to SRT?

Styled subtitles for video — anime fansubs, professional video typesetting, karaoke timings. Universal subtitle format for video players and editors. The most common reason to convert is compatibility, SRT works in places where ASS doesn't, or vice versa.

How do I open a ASS file in the first place?

Aegisub is the canonical editor (free, all platforms). VLC, MPV, IINA, and PotPlayer render ASS overlays natively. ffmpeg can burn ASS into a video track or pass through as a soft subtitle stream. Any text editor opens .ass as plain UTF-8.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.