Excalidraw
Other Tools
Online
Hand-drawn style whiteboard with rough strokes and PNG export.
手绘风格白板：Rough 笔触模拟，适合草图讨论。
Overview
Runs entirely in your browser.
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tldraw
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Generate a conversion prompt to translate code between programming languages with AI.
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Online stopwatch with lap times and millisecond precision display.
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Generate random integers in a range or secure-style random passwords.
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Doodle canvas
Freehand draw on a canvas and export your sketch as PNG.
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Online drawing tool
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Online calculator
Simple four-function calculator with keyboard-style buttons.