What is the maximum video length on Reddit?

A native video post on Reddit can be up to 15 minutes long. That is far longer than most short-form platforms, but the feed favours shorter clips, so the first few seconds still carry the most weight for retention.

How long can a Reddit video ad be?

Reddit video ads can run from 5 seconds up to 30 minutes, though most effective ads stay under 30 seconds. Longer ad creatives are accepted but rarely hold attention, so front-load the hook and brand within the first few seconds.

Is there a minimum video length on Reddit?

Native feed videos have no strict minimum and very short clips are accepted, but video ads must be at least 5 seconds. For organic posts, aim for at least a few seconds so the autoplay preview is meaningful.

Can you post video in Reddit comments?

Yes, many subreddits allow video and GIF replies in comments. Comment video follows the same native upload limits, but shorter clips load faster and are more likely to autoplay, so keep comment clips brief.

What happens if my video is too long for a format?

Reddit will reject an upload that exceeds the format's maximum, so you must trim it first. This tool shows exactly how many seconds you are over so you can cut to the limit before exporting and uploading.

Reddit Video Length Checker

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Reddit accepts much longer video than most short-form platforms, but each format has its own minimum and maximum. Enter your clip’s duration and this checker marks every Reddit format it qualifies for, and tells you how much to trim when it does not.

How it works

Each Reddit video format has a min and max duration in seconds. The tool converts your input to total seconds and tests it against every format:

qualifies = duration >= format.min AND duration <= format.max
overBy     = duration − format.max   (when too long)
underBy    = format.min − duration   (when too short)

A format is marked fits when your duration sits inside the window, and otherwise shows exactly how many seconds you are over or under. Native feed video allows up to 15 minutes; video ads run from 5 seconds to 30 minutes.

Tips and notes

Even though Reddit allows long video, retention drops sharply after the opening seconds, so the first 3 seconds should carry the hook. For ads, keep creative under 30 seconds for the best completion rate despite the 30-minute ceiling. All calculations run locally in your browser.