Timestamp Converter
Paste UNIX timestamp or date string and get UTC, local time, ISO format, and relative time.
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JSON to Model Converter
Convert JSON objects into strongly typed models across popular languages.
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Markdown Viewer
Write and preview markdown live with line numbers, GFM support, and copyable code blocks.
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Web Performance Checker
Analyze Core Web Vitals and Lighthouse performance metrics with practical optimization suggestions.
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SEO Checker
Audit homepage SEO best-practice signals like metadata, structure, crawlability, and media tags.
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Tileset Level Tester
Upload a 2D tileset and instantly preview it as a game level, then download a 1280x960 JPG. Fully in-browser.
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Parallax Tester
Preview multi-layer parallax scrolling from your own tileset, character, backgrounds, and foregrounds. 1920x1080, in-browser.
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Astu's AvatarLab
A lightweight tool to generate and preview avatars.
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