loper

Loper · Subtitles, captions & localization

Open .ttml files on your Mac.

.ttml .dfxp .itt

Timed text for broadcast and streaming with begin/end times and styling attributes.

Loper is a free, minimal editor for macOS that opens TTML / DFXP / IMSC / iTT 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.ttml opened in Loper: TTML / DFXP / IMSC / iTT with color-coded XML
Show the file as text
<tt xmlns="http://www.w3.org/ns/ttml" xml:lang="de" ttp:frameRate="25">  <body>    <div>      <p begin="00:00:01.000" end="00:00:04.200">Bisher bei Night Shift…</p>      <p begin="00:00:04.800" end="00:00:07.950">Sind alle Karten gesichert?</p>    </div>  </body></tt>

How to open .ttml files

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

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