This mod will change the way you break trees. 4 modes are available:

Instantaneous: Break one log and the whole tree will fall
Shift down: Break a block and the log will slowly shift down as you cut it (good if you don't want to "cheat" too much but are lazy to go cut top log blocks 😛)
Fall items: Break one log and the whole tree will fall with an animation
Fall blocks: Break one log and the whole tree will fall on the floor with an animation

Demonstration of breaking a tree Another demonstration of breaking a tree

Several options are available in the config file:

Customize what is considered as a tree (log blocks & leave blocks).
Customize what tools can be used (add more axes, allow everything, …).
Turn leaf breaking on/off.
Option to disable the effect of the mod by sneaking (can be reversed).
Change speed depending on the tree size.
Damage tools or not (can set it to break the tool by the amount of blocks there were in the tree).
Let tools at 1 durability if it's going to break.

Check out the wiki for some more information.

For Fabric users, Fabric API is required.
For Neoforge/Forge users, Cloth Config API is optional on the client and allows you to have a config GUI in game.

NOTE: Starting Minecraft 1.21, enchantments needs to be added separately through a datapack available here.

NOTE: On servers this mod can be server-side only, client isn't required (except if you use the change speed feature and/or enchants configurations).

Incompatibilities have been reported with :