SpriteFrame — AI Sprite Sheet Maker for Game Animation

What is SpriteFrame?

SpriteFrame is a browser-based sprite sheet maker aimed at game developers who need animation frames for 2D characters. Rather than a general image generator, it does one specific job: turn animation sources into a game-ready sprite sheet. It supports three input paths — AI-animating a single character image into frames for preset motions such as Idle, Walk, Run, and Attack; combining existing PNG frames into a packed sheet; and extracting frames from an MP4 clip. The site also positions itself against desktop packers with a TexturePacker comparison and publishes integration guides for Godot and Unity.

The tool is web-only. There are no desktop apps, no mobile apps, and no resold API. English is the only interface language shown.

How SpriteFrame Works

The AI path has four steps. First, upload a character image — PNG, JPG, or WebP up to 20 MB, with a pure white background recommended for best results. Second, describe the motion; the site offers preset motions (jump, death, wave, and others) and accepts animation directives of up to 1,500 characters. Third, set the output: frame counts of 16, 25, 49, or 64, durations of 1 to 5 seconds, frame sizes from 128x128 to 768x768, and Standard or High quality. Fourth, run the animation, which costs 30 credits; the credit cost is displayed before running, and AI features require an account.

The non-AI paths are simpler: PNG-to-sheet and video-to-sheet conversion require no account and process files locally in the browser, though both cap at 120 frames. Transparency is preserved for sprites with alpha channels.

Main Features

• AI character animation — generate motion frames (idle, walk, run, attack, jump, death, wave, and custom directives up to 1,500 characters) from one character image.
• PNG frame packing — combine existing frame sequences into a single sprite sheet without an account.
• MP4-to-sheet extraction — pull frames from video clips for rotoscope-style or reference animations, also locally and free.
• Configurable output — choose 16/25/49/64 frames, 1-5 second durations, 128x128 to 768x768 frame sizes, and Standard or High quality.
• Engine-ready export — download a ZIP sprite sheet with JSON timing data intended for playback setup in a game engine.
• Godot and Unity guides — dedicated integration documentation, plus a TexturePacker comparison page.

Pricing

SpriteFrame uses a credit model for its AI features. Each AI animation costs 30 credits, and the site displays credit costs before any AI run; an account is required for AI features. PNG-to-sheet packing and video-to-sheet extraction are free and need no account. However, the reviewed page does not publish plan prices or credit-pack pricing — there is no visible dollar amount for credits, so buyers must check inside the app or a pricing page not linked from the reviewed content. The site does not mention a free AI trial.

Common Use Cases

• 2D character prototyping — quickly producing idle/walk/run/attack sheets for game jams and greybox builds.
• Legacy asset repacking — consolidating loose PNG frame sequences into engine-ready sheets.
• Reference animation capture — extracting frames from gameplay or live-action MP4 clips for study or rotoscoping.
• Engine onboarding — following the Godot and Unity guides to wire up sprite playback with the exported JSON timing data.

Limitations

The JSON file that ships with exports is reference data only — the site is explicit that it "does not create engine project files," so developers still configure playback themselves. PNG and video tools cap at 120 frames per job. AI animation requires a pure white background for best results, which may force preprocessing of existing art. Users must hold the rights to any input assets, and AI output remains subject to the underlying model providers' terms. There is no in-browser frame editor for touching up individual frames, no free preview of AI output, and no published dollar pricing on the reviewed page.

Summary

SpriteFrame is a focused utility that covers the three practical ways sprite sheets get made: animating a character with AI, packing existing frames, and cutting frames from video. Its free, account-less packing and extraction tools are useful on their own, and the Godot/Unity guides plus JSON timing data ease the handoff into an engine. The trade-offs are the missing in-browser editor, the 120-frame cap on free tools, credit-gated AI with no free preview, and unpublished dollar pricing — factors that make it best suited to indie developers who want quick sheets without installing desktop packing software.