How to Tie a Reef Knot Step by Step

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Written Instructions — Reef Knot

Left over right Cross the left end over the right end and tuck under. Pull snug.
Right over left Now cross the right end over the left end and tuck under — opposite direction from step 1.
Pull both ends Pull both ends apart to tighten the knot flat against the sail or material.
Verify correct shape The reef knot must be flat with two parallel loops. If any loop sticks out to the side, retie — you have a granny knot.
Release — capsize method To release: push one bight sideways toward the knot center. The knot capsizes and falls apart in one motion — critical for reefing in heavy weather.

Left over right, right over left — the same sequence as the square knot. Sailors sometimes say 'reef and right.'
The reef knot capsizes (releases) when you push one loop toward the knot — practice this in dry conditions.
Never use a reef knot to join two ropes bearing significant load — use a sheet bend for joining.
On a sail reef, both sides must be tied simultaneously for the sail to hold its shape correctly.