ABCDEFGHIJ
1
1Name, Creature 1Ter.Low.Mod.High.Ext.
2
levelTraits
Perception +10
Languages
Skills
Str +4, Dex +3, Con +4, Int +1, Wis +1, Cha +1
Items
STRHigh4
3
DEXModerate3
4
CONHigh4
5
INTLow1
6
AC 15; Fort +7; Ref +7; Will +7
HP 25; Resistance/Weakness (min 2, max 3)
WISLow1
7
CHALow1
8
Speed 25ft
melee ◆ weapon +11 (), damage 6
melee ◆ weapon +9 (), damage 6
Innate Spells / magictype Spells Prepared / magictype Spontaneous Casting (DC 17, Spell Roll +9)
Unlimited Area Damage 5, Limited Area Damage 7
PerceptionHigh10
9
Armor ClassModerate15
10
FortitudeModerate7
11
ReflexModerate7
12
This tool is based on the Pathfinder 2nd Edition Gamemastery Guide Monster and Hazard Creation document.

You can select the Creature's level in the upper left corner for any level between -1 and 24. Then click to fill in the appropriate ckeckboxes on the right after which your stat block will appear.

Once all of the basic statistics are filled, you can Copy-Paste the statblock into a textual document and get to designing the monster's abilities (the important part). I recommend keeping the original document around if you are not too experienced with this process since it contains valuable informations about balancing your monster's basic statistics and abilities.

Hoping this saves you time!
WillModerate7
13
Hit PointsHigh25
14
Attack AExtreme11
15
Attack BHigh9
16
Attack C#N/A
17
Damage AHigh6
18
Damage BHigh6
19
Damage C#N/A
20
Spell RollHigh9
21
Spell DCHigh17
22
Min Resist2
23
Max Resist3
24
Unlimited5
25
Limited7