loper

Loper · Subtitles, captions & localization

Open .ass files on your Mac.

.ass .ssa

Styled subtitles with Script Info, Styles and Events sections.

Loper is a free, minimal editor for macOS that opens Advanced SubStation Alpha instantly and colors every part of the file, so you find the value you need at a glance and can fix it right there. No IDE, no project to load, no gray wall of text.

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episode_01.ass opened in Loper: Advanced SubStation Alpha with color-coded INI / Properties
Show the file as text
[Script Info]Title: Night Shift 01PlayResX: 1920PlayResY: 1080 [Events]Format: Layer, Start, End, Style, TextDialogue: 0,0:00:01.00,0:00:04.20,Default,{\i1}Previously on Night Shift…{\i0}

How to open .ass files

  1. Download Loper (free, Apple silicon, signed and notarized) and move it to Applications.
  2. Double-click your .ass file, drag it onto the Loper window, or right-click it and choose Open With › Loper.
  3. Want every .ass file to open in Loper? Choose Loper › Make Loper the Default Editor….

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