A sheet of possibilities.
One smooth little loop.
Give your AI-generated frames a little direction. Slice a sheet, fine-tune the motion, and export an animation you can actually use.
Preparing your workspace…
What is FrameMint?
FrameMint is a free browser tool for organizing AI-generated sprite sheets and existing PNG sequences. It slices, previews, reorders and positions frames, then exports GIF animations or PNG assets.
How to use FrameMint
- Open a PNG, JPG or WebP sheet, set rows, columns, gaps and offsets, then apply the grid. Or import a PNG sequence.
- Preview the animation. Reorder or remove frames, change timing and adjust positions with a previous-frame overlay.
- Export an animated GIF, a PNG sequence ZIP, or an atlas PNG with generic JSON metadata.
At a glance
| Inputs | One PNG/JPG/WebP sheet or multiple PNG frames |
|---|---|
| Input limits | 64 frames, 20 MB total, 16 megapixels decoded |
| Outputs | GIF, PNG sequence ZIP, atlas PNG + generic JSON ZIP |
| Processing | Local browser processing; no image upload or generation API |
Common questions about FrameMint
Does FrameMint generate new frames with AI?
No. It organizes existing images, including those made with image generators. It cannot redraw a character or repair missing movement.
Does the GIF look identical to the PNG preview?
GIF has a limited palette and on/off transparency. Frame timing is rounded to 10 ms. PNG exports preserve full alpha; check the downloaded GIF separately.
Can I import the atlas JSON directly into any game engine?
The JSON is a documented generic coordinate and timing format with a top-left origin. It is not an engine-specific import preset. Check your engine’s sprite import settings.
Is there a sign-up or upload?
No account is required and image files remain on your device. Cloudflare Web Analytics and small aggregate action counters are separate from your image data.
From generated image to usable motion.
FIELD NOTESTurn a sprite sheet into an animated GIF
Set a grid, inspect the motion, choose timing and export a loop from an existing image.
02 / GUIDEFix frame alignment without flattening the motion
Use a fixed canvas and a previous-frame overlay to inspect unwanted jumps while keeping deliberate movement.
03 / GUIDEChoose PNG frames, a GIF or a sprite atlas
Understand the three exports, generic JSON coordinates, alpha transparency and playback timing.