loper

Loper · Colorists & finishing

Open .amf files on your Mac.

.amf

ACES look and viewing pipeline that travels with a clip from set to finishing.

Loper is a free, minimal editor for macOS that opens ACES Metadata File (.amf) 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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A001C003.amf opened in Loper: ACES Metadata File (.amf) with color-coded XML
Show the file as text
<?xml version="1.0" encoding="UTF-8"?><aces:acesMetadataFile xmlns:aces="urn:ampas:aces:amf:v2.0" version="2.0">  <aces:amfInfo>    <aces:description>Night Shift - A001C003</aces:description>    <aces:dateTime><aces:creationDateTime>2026-10-25T14:32:00Z</aces:creationDateTime></aces:dateTime>  </aces:amfInfo>  <aces:pipeline>    <aces:inputTransform><aces:transformId>urn:ampas:aces:transformId:v2.0:CSC.Arri.LogC4_to_ACES.a2.v1</aces:transformId></aces:inputTransform>    <aces:lookTransform applied="false">      <aces:file>NightShift_Show.clf</aces:file>    </aces:lookTransform>  </aces:pipeline></aces:acesMetadataFile>

How to open .amf files

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

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