An .idx file, short for "index file," is a companion file that contains metadata about a video file, typically in a subtitle or closed caption format. It's often used in conjunction with video files, such as .mp4 , .avi , .mkv , or .mov .

00:04:24,000 --> 00:04:24,500 Don't look at the mirror. Look at the index.

Leo double-clicked the .avi . Grainy footage flickered to life: the dashboard of a car, rain on the windshield, his father’s hand adjusting the rearview mirror. The video had no sound, no subtitles. It was just ten minutes of driving in the dark.

Then he opened the .idx file.

Idx Video File New! Jun 2026

An .idx file, short for "index file," is a companion file that contains metadata about a video file, typically in a subtitle or closed caption format. It's often used in conjunction with video files, such as .mp4 , .avi , .mkv , or .mov .

00:04:24,000 --> 00:04:24,500 Don't look at the mirror. Look at the index. idx video file

Leo double-clicked the .avi . Grainy footage flickered to life: the dashboard of a car, rain on the windshield, his father’s hand adjusting the rearview mirror. The video had no sound, no subtitles. It was just ten minutes of driving in the dark. An .idx file

Then he opened the .idx file.