Code and Developer Utilities — running locally in your browser

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Python Playground

Write and run Python right in your browser: turtle graphics, NumPy, OpenCV, package installs and files from your computer.

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JSON Viewer

Open JSON as a tree or a table, check the syntax, find the node you need and copy its path.

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XML Viewer

Open XML as a tree or a table, check the syntax, copy the path to a node.

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Dummy File Generator

Create a file of an exact size: an image, PDF, ZIP, CSV or a dummy file. For testing upload limits.

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Fake Data Generator

Names, addresses with real postcodes, phones and currency from one country. CSV, JSON, SQL, XLSX, up to 100,000 rows.

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Flowchart Maker

Draw flowcharts with ISO 5807 symbols: arrows route around shapes by themselves, and Mermaid code turns into a diagram.