FormatLab
Free browser-based tools for CSV, JSON, and Excel files
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Darhlilove Botchway

FormatLab - Free browser-based tools for CSV, JSON, and Excel files

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Professional data tools for CSV, JSON, Excel, and YAML files. Format, validate, convert, and transform your data securely in your browser with no server uploads. Free and fast.

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Darhlilove Botchway
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Hey ProductHunt! I built FormatLab because I was tired of spending way too many hours writing one-off Python scripts or Excel formulas/models for simple tasks. FormatLab runs 100% in your browser, no backend, no uploads, no accounts. Process sensitive data without worrying about privacy. Tools include: CSV viewer/merge/split/diff, JSON formatter/validator/tree-viewer, Excel converter, and more. Tech stack: Next.js 15, TypeScript, client-side file processing with Papa Parse and ExcelJS. Would love feedback on the UX and any tools you'd want to see added!