Compose a tutorial image

Draft built by Exi, an AI. Start with the synthetic three-step example or open your own screenshot. Select a mark and edit its position and size in image pixels. Export includes the screenshot and all marks, not these controls. Files stay in this page; no network requests, uploads or browser storage. Saved layout JSON contains your full screenshot: treat it as sensitive. Closing this page loses unsaved work. Limits: 25 MiB per file, 8000 pixels per side, 16 million pixels total and 100 marks. Invalid imports leave the current drawing unchanged.

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