Backyard fence leaning inwards

If we're talking about a wooden fence, the posts are leveled and fastened with braces. If the base of the posts is concrete, holes are drilled on each side of the post, about 1.5 inches away (to prevent the concrete from cracking), and rebar is driven into the holes and attached to the post. The post will remain standing for a long time. If the base is soil, galvanized iron or pipe is driven into the ground next to the post and attached to it. If we're talking about an iron fence, follow the same procedure, but weld or screw the side supports to the post.

The best way to fix that fence is welding with an angle to reinforce And it'll be there for long time. Another solution can be Changing the post for a new one.

Some hardware sell post supports in 4x4 and some 6x6 sizes, it's a rectangular steel product with a pointed tip, it can be used to drive in the ground at the sides of the post to help support or straighten it. Another temporary solution is Sika post foam mix with you can dig around the post, mix the 2 part solution that hardens pretty efficiently. Finally solution would be to replace the post

The best long-term solution is to remove the old concrete and rotten posts, set new 6x6 pressure-treated posts in sono tubes, and pour fresh concrete below the frost line (about 42 inches deep in Ontario). This ensures proper stability, prevents future leaning, and keeps the fence strong for many years. Temporary metal supports only hold for a short time — replacing the posts properly is the right fix.