A Mac tool for indie game art: auto-frame sprites from one sheet, grid or freehand boxes, wand and eraser cleanup, then export locally. No account. No cloud. Art stays on your Mac.
Works best when sprites are clearly separated. Sticky or complex art: use Freehand, Wand, or Eraser. Direct purchase is on the homepage ($4.99 one-time). Also on the Mac App Store (no AS1 key).
Open an atlas (drag & drop or File → Open). Sample atlases are in the app bundle.
Use the sidebar to switch Grid or Free (freehand) mode.
Export tiles (or atlas + JSON) to a folder you choose — then drop them into your game project.
Capabilities (as on the product site)
Full Mac app: Grid, Free (Auto Frame, Rect, Select, Wand, Eraser), Trim to content, Save Image for one region, Image Properties, and export (tiles or Atlas + JSON). Some older Creem direct-sale builds shipped without Eraser / Trim.
Auto Frame
In Free mode, click the background once to box many sprites at once — ideal for clear sheets on transparent or solid fills. PNG: click transparent; JPG/BMP: click the solid key color. Settings → Auto Frame → Min Size… (or double-click the Auto tool) skips tiny islands (default about ≤ 8×8).
Grid & Freehand
Grid: regular tilesets — set cell size, rows/columns, margins, and spacing. Edge modes: Crop (discard leftover edge pixels; full cells only) or Pad (keep cell size; extra rows/cols filled with transparency). Hover a cell to preview the tile.
Free (Freehand): draw rectangles when the layout is irregular; resize with handles; organize and rename in the Cells list. Right-click a pending box for Trim / Add to list / Save Image. Right-click a listed cell for Trim / Copy Image / Save Image / Delete. Overlapping boxes: right-click → Select → #id.
Cleanup (Wand & Eraser)
Magic Wand: select and clear backgrounds to transparency when Auto Frame needs a cleaner pass. Click opaque pixels; Shift+click to add. Right-click: Expand 1px / Contract 1px / Make transparent / Invert / Deselect. Double-click the Wand tool (or Settings → Wand → Tolerance…) to adjust sensitivity.
Eraser: hard square brush (1–16 px) clears alpha for small seams and leftover pixels. Right-click or double-click the tool icon for size. Undo / Redo supported for wand, make-transparent, and eraser.
Trim, Save Image & Image Properties
Trim to content — tighten a pending or selected Free box to opaque pixels.
Save Image — write the current region (pending or selected cell) as one file using the same export format and naming rules as batch Free export.
Batch-export individual PNG / JPG / BMP tiles with names you control.
Optional Atlas + JSON (schema atlas_splitter.atlas/v1): full sheet + frame table with x,y,w,h and offX/offY/sourceW/sourceH (logical canvas on full builds).
Settings → Export Format: PNG (keeps transparency), JPG / BMP (white background), or match source.
View Sync — keep canvas selection synced with the Cells list (Settings → View Sync; on by default).
Pan / zoom — Move tool, mouse wheel, two-finger scroll, pinch; Space / middle-mouse pan on other tools.
Session — unsaved slicing can be restored on next launch (local only).
Settings & UI
Language
English, 简体中文, 日本語, 한국어.
Button Theme
Charcoal, Blush, Teal, Steel Blue.
Keyboard Shortcuts
Help → Keyboard Shortcuts… (open, undo/redo, mode tips, Esc behavior).
Who it’s for
Written for indie game developers and artists. The author is an indie developer too: open texture communities are full of atlases, but pulling sprites out quickly is awkward, and full image editors are often too heavy when you only need to cut tiles. Atlas Splitter keeps that job light — open a sheet, frame, export on your Mac. If you like, you can also use Grid for social-media layouts, Wand to cut out backgrounds, and Copy Image to the clipboard so you can paste into other graphics apps. On clear transparent atlases, Auto Frame + export is often about a couple of minutes. Complex backgrounds: Freehand + Wand, iteratively, with undo.
Licensing
One-time purchase, $4.99 (not a subscription).
macOS desktop app; notarized .dmg from the website, and on the Mac App Store (see MAS support).
You are responsible for the copyright of images you open and export.
How do I get the product after buying? See How to get the product: Creem checkout → download .dmg from Creem → install → activate with AS1 key.
How do I open an image? File → Open, drag & drop, or use Samples in the app bundle.
Which formats? Open and export PNG / JPG / JPEG / BMP. Export can also write Atlas + JSON (schema fields include offX/offY, sourceW/sourceH — identity on Creem 1.0.0-7; see Export above).
What are off / source in the JSON? Schema fields for sample placement inside a logical canvas. On Creem 1.0.0-7 they are identity. Older files missing these fields are treated as identity on import.
How do I activate a direct-sale license? After purchase you receive a separate activation email with an AS1.… key. Open the notarized app, paste the entire key (line starting with AS1.) — use Paste from Clipboard if ⌘V is awkward — then Activate. Mac App Store builds do not use this key.
How long until the activation key email arrives? Usually within 12–24 hours after a successful order (often sooner). Check spam if nothing arrives; after 24 hours email 917097871@qq.com with your order ID.
Creem’s receipt shows a “license” string — is that my key? No. Creem receipt codes are not Atlas Splitter activation keys. Use only the AS1.… key from the activation email. See How to get the product.
How many Macs? One license covers 2 Macs. The first Mac can activate offline; activating on a second Mac needs a short online seat check. Already-activated Macs keep working offline.
How do I move to a new Mac? On the old Mac: Help → Deactivate This Mac… (releases the seat and quits). Then activate on the new Mac once online. Or email support with order proof to free a seat.
How do I update after buying? Re-download the notarized .dmg from Creem (receipt email link or customer portal), install over the previous copy, and keep using the same AS1 key.
Does every build include Eraser / Trim? The full Mac app (including typical Mac App Store builds) includes Eraser and Trim to content. Some older Creem reduced packages omit them; Grid / Free / Wand / export still apply. Use Image → Image Properties… to inspect the open atlas.
Privacy? Processing is local on your Mac — see the Privacy Policy. Seat checks (when online) only send a key id and a machine fingerprint hash.