Free Online Developer Tools
Fast, Secure & Private Online Utilities
Essential tools for developers, creators, and web professionals. Processing is performed 100% inside your browser for maximum privacy.
Zero Data Logging: FactLibrary operates strictly client-side. Your inputs and text queries are never stored or transmitted to backend servers.
Developer
JSON Formatter & Validator
Format, validate, and minify raw JSON data with instant error highlighting.
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Developer
Base64 Encoder & Decoder
Convert strings to Base64 and decode Base64 back to plain UTF-8 text safely.
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Content
Word & Character Counter
Analyze text length, count words, sentences, and estimate reading time.
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Utility
URL Encoder & Decoder
Encode special query parameter characters or decode percent-encoded URLs.
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Security
UUID / GUID Generator
Generate bulk unique v4 UUIDs for API development and database keys.
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