✦ RPG Maker MZ — Browser Toolkit

A set of small, single-file tools for making RPG Maker MZ games. Each one is plain HTML — no install, no build step, no server. Open it in a browser and it works fully offline, even straight off your hard drive. Free to use, free to share.

16 tools 100% offline no tracking drop a file, get an answer

Looking for plugins instead? ◆ Download the MZ plugins →

Art & sprites

CSP Template Generator

artsprites

Generates a correctly-sized guide overlay (cell grid + foot anchor points) to draw your character or tile art underneath in Clip Studio Paint or any layered art program.

Pick what you're drawing (character, SV battler, tileset, etc.).
Download the overlay PNG.
Drop it in as a top layer in your art program and draw beneath it.

Sprite Slicer & Animation Preview

drop a filesprites

Drop a character sheet and scrub its real MZ walk cycle (frame order 0 1 2 1) live, in every direction. Auto-detects full 4×2 sheets vs single $ sheets.

Drop your character PNG onto the page.
It slices the sheet and shows each direction.
Press play to check the animation before it ever touches the editor.

Autotile Assembler & Preview

drop a filetiles

Drop an autotile block and see exactly how MZ will stitch its edges and corners — using the engine's own FLOOR / WALL autotile tables, so what you see is what you get in-game.

Drop your A1–A4 autotile block PNG.
Preview the stitched edges, inner corners and transitions.
Fix the source block if any seam looks wrong, then re-drop.

Tileset Sheet Validator

drop a filetiles

Wrong-sized tileset sheets slice wrong and glitch silently. Drop a sheet, pick its slot, and get the exact dimensions MZ expects — plus a drawn grid and autotile-block boundaries.

Drop your tileset PNG.
Choose which slot it's for (A1–A5, B–E).
Read the pass/fail and the exact pixel size to export at.

Palette Extractor & Cohesion Checker

drop a filecolor

Drop the art you've already drawn to pull one unified palette out of it. Export a swatch strip (load it into CSP and eyedrop) or a .gpl, then flag pixels in new art that drift off-palette.

Drop several finished sprites/tiles.
Review the extracted palette; export a swatch strip or .gpl.
Drop a new asset to highlight any off-palette pixels.

Enemy Variant Generator

drop a filecolor

Draw one enemy and spin out hue-shifted / tinted variants, so a single design becomes a whole roster (one "thug" → a gang).

Drop your enemy battler PNG.
Adjust hue / tint to taste.
Download each variant you like.

IconSet Preview

drop a filereference

Shows an IconSet.png with every icon labelled by its index, so you can find the number to use in \I[n] codes, notetags, and database fields.

Drop your IconSet.png (or click to pick a file).
Browse the grid; read the index under any icon.
Click an icon to copy its index to the clipboard.

Data, stats & balance

Stat Curve Builder

dataexport

Design stat progressions across levels 1–30 visually, then export the exact numbers to paste into your Classes.json parameter curves.

Shape the curve for a parameter (HP, MP, ATK…).
Compare growth at each level.
Copy the generated values into the class's curve.

Balance Calculator

databattle

Sandbox your battle math: plug in attacker/defender stats and damage variance to see the real damage range a hit produces (MZ's default variance is 20%).

Enter the stats and formula inputs.
Read the min/avg/max damage spread.
Tweak until fights feel right before testing in-engine.

Enemy Designer

project notesbattle

Plug in your party's levels and an encounter shape, and get suggested enemy stats back — derived from the class growth curves and the a.atk * 2 - b.def damage formula, so fights land in a sane range.

Enter party levels and pick a fight type / difficulty.
Read the recommended enemy stat block.
Use it as a starting point, then tune in-engine.

Tuned to the author's class curves and battle formula. Useful as a balancing method; the exact numbers assume that game's setup.

Notetag Cheat-Sheet

project notesreference

A searchable cheat-sheet of notetags. RPG Maker reads notetags case- and whitespace-sensitively, so a mistyped key fails silently — this keeps the exact spelling handy.

Search for the tag or feature you need.
Copy the exact, correctly-cased syntax.

Generated for the author's own project. Useful as a format reference; the specific tag list reflects that game's setup.

Writing & UI

Message / Dialogue Previewer

loads your assetsdialogue

Type a Show Text message with control codes (\C \I \N \P \V \G \{ \}) and see it rendered the way MZ draws it — colors, icons, line wrap, font sizing, window position and the typewriter reveal. Warns about lines too wide, too many lines, and mistyped codes.

Type your message text and pick window position / size.
Hit the typewriter button to preview the reveal (with sound).
Drop your own Window.png, IconSet and font for exact rendering.

Auto-loads bundled project assets when present; otherwise falls back to an approximate skin and editable defaults, so it still works anywhere.

Audio & music

Rhapsody — FM Forge mk2

audioexport

A 3-operator FM synth that forages playable patches from a seed — glass bells, dream rhodes, warm pads, round bass, brass stabs and off-world weirdness — with feedback, wavefold and bit-crush for grit. Play it on-screen, then export a .wav to drop on LMMS's AudioFileSNDF.

Hit forage (optionally pick a category) or shape the operators by hand.
Audition the patch with the mouse or your keyboard (a w s e d f…).
Export the .wav — it pitch-tracks across the keys in LMMS; the seed rebuilds any patch.

Rhapsody — FM Forge

audioexport

The original 2-operator "dream instrument" — a lighter take on the same seeded patch foraging and .wav export, built on plain Web Audio oscillators (no feedback/fold/crush grit stage). Reach for mk2 if you want the 3-op engine and lo-fi teeth.

Hit forage to roll a patch, or shape the carrier & modulator by hand.
Audition it with the mouse or your keyboard.
Export the .wav for LMMS's AudioFileSNDF; the seed rebuilds any patch.

Maps & reference

World / Flow Graph

load your projectmaps

Draws every static Transfer Player connection between maps as a graph — green start map, blue reachable, amber dead-end (no way out), red unreachable. Great for spotting soft-locks and orphan maps.

Click "Load your project's data folder" and pick your game's data folder.
Drag nodes to rearrange; scroll to zoom.
Read the colors to find dead-ends and unreachable maps.

Opens on a small sample. Loading your data folder reads it locally (nothing uploaded) and rebuilds the graph from your own maps.

Tricks & Tutorials

referenceguide

A filterable reference of practical MZ techniques — on-screen enemy behavior, mapping & layout, event logic, and how each tool in this folder fits in. Type to filter the cards.

Type a keyword to filter to the topic you need.
Each card is a self-contained tip or mini-tutorial.

No tools match that filter.

Using & hosting these

Run locally: double-click any tool's .html file to open it in your browser. No internet needed.
Host on Neocities (or anywhere): upload every .html file in this folder, keeping them side-by-side, and this index.html links them all together.
Your files never leave your computer. Tools that take a file (sprite sheet, tileset, palette) read it right in the browser — nothing is uploaded.
Most tools work for any project as-is. The World Graph and IconSet Preview open on a sample but let you load your own data folder / icon sheet. The Message Previewer auto-loads bundled art when present and falls back gracefully. Only the Notetag Cheat-Sheet is specific to the author's game (handy as a format reference).