Monster Maker

About

Monster Maker is a fast, browser-based toolkit that takes the tedium out of building custom creatures for 5e. Instead of juggling spreadsheets, rulebooks, and CR guidelines, you shape every part of a monster in one clean interface and watch the math update in real time.

• Point-and-click stat editing

Change hit dice, size, speed, senses, proficiencies, or saving throws with simple dropdowns and sliders. The app instantly recalculates Armor Class, hit points, attack bonuses, and save DCs so the numbers always line up with 5e design rules.

• Live Challenge Rating calculator

As you adjust offensive and defensive stats, the CR meter shows both the “defensive CR” (HP and AC) and “offensive CR” (damage and attack bonus), then blends them into a final CR. If the two sides drift too far apart, the display highlights the larger gap so you can rebalance on the fly.

• Actions, reactions, bonus actions, and legendary options

Add a claw attack, breath weapon, lair action, or even full legendary action suites with a few clicks. Damage expressions accept die notation (e.g., 6d6 + 4) and automatically convert to average values for the finished stat block.

• Trait and spell builder

Write your own “pack tactics”-style traits, import spell lists by name, or flag an ability as recharge 5-6, 1/day, or at-will. Each entry is formatted to the official style guide so the finished block looks publication-ready.

• Import SRD or homebrew templates

Pull in an existing SRD monster, tweak a handful of numbers, and you’ve got a variant in minutes. You can also save any creature you make as a personal template and reuse it later.

• Scalable proficiency bonus

Toggle between static PB (per the Monster Manual) and level-style PB (per Tasha’s) to match the sort of stat block you prefer.

• Clean exports

– Print-ready PDF that matches the Monster Manual layout

– Rich-text / markdown for wikis and forums

– Raw JSON for virtual tabletops or further scripting

• Offline mode

Once you’ve loaded the page, every feature still works without an internet connection—handy for convention halls and basement tables alike.

• Themeable interface and accessibility options

Light and dark themes, larger font mode, and full keyboard navigation keep the tool usable for long prep sessions.

In short, Monster Maker lets Game Masters start with a creative idea—“what if a faerie dragon learned necromancy?”—and finish with a balanced, polished stat block in the space of a coffee break. No spreadsheets, no guesswork, just solid game-ready monsters.