Improvements in a line brake with strap. The brake is a one-way brake that allows a user to pull the line through the brake to shorten the length of the line and when tension in the opposite direction is placed on the line, the brake prevents the length of the line from extending through the brake. The strap is flexible and can be completely opened to freely wrap around a post, pole, line, rail, cord, capstan, handrail, cleat, post, cord or anchor, where a free end of the pole can't be easily reached over, though, under or around. The strap has a key opening that prevents the strap from easily opening when the key is not linearly aligned and/or rotated. A tail on the strap further prevents accidental dislodging of the strap from the line brake.