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On-Disk File Comparison

Compare with the file on disk, or with another open tab. Refresh compares again.

Compare file revisions and server logs with high-performance on-disk diffing.

Marlin diff against the file on disk
stream.swift +0 −0. The left pane is the file on disk. The right pane is the editor. Refresh reloads the disk copy.

Comparing Files (⌘D)

Compare with File on Disk is ⌘D. The toolbar prints the document name, then +added and −removed. Compare with chooses the other side: the file on disk, or another open tab. On the shot the columns are STREAM.SWIFT ON DISK and EDITOR, and the counts are +0 −0.

The Two Columns

The two sides scroll together. When they match, the empty line reads that the editor matches the other side.

Marlin diff against the file on disk
Compare with File on Disk. The disk copy is on the left and the editor buffer is on the right. Refresh reloads the disk side.

Refresh

Refresh compares again with the latest contents. A Markdown document can also switch the comparison between Lines and Rendered. Summarise change appears when Apple Intelligence is on.