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Base64 Encode / Decode
Encode text or files to Base64 and decode Base64 back to text or binary.
Browser-based Open Tool
100% Client-Side & Private — No Data Sent to Servers
Utility Tools — Free Online Developer & Designer Tools
Fast, free, privacy-friendly online developer tools that run directly in your web browser. 41 tools for formatting JSON, converting data, manipulating images, and editing text.
Text Tools(9 total)
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URL Encode / Decode
Percent-encode and decode URLs with support for full and component encoding.
Browser-based Open Tool
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Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, and more.
Browser-based Open Tool
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Lorem Ipsum Generator
Generate placeholder text by words, sentences, or paragraphs.
Browser-based Open Tool
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Diff Checker
Compare two blocks of text with line-level diff highlighting.
Browser-based Open Tool
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Regex Tester
Test regular expressions with live match highlighting and capture groups.
Browser-based Open Tool
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Markdown Previewer
Write Markdown and see it rendered live.
Browser-based Open Tool
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Markdown ↔ HTML
Convert Markdown to HTML and HTML to Markdown.
Browser-based Open Tool
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CSV ↔ Excel
Convert CSV files to Excel and vice versa.
Browser-based Open Tool
Why Choose Our Free Online Developer Utility Tools?
At utilitiestools.net, we provide a complete suite of fast, reliable, and privacy-first online developer tools engineered specifically for modern software engineers, web developers, content creators, and UI/UX designers. Every single utility tool in our collection operates 100% locally inside your web browser using WebAssembly and client-side JavaScript APIs. Your data, source code, API keys, JSON payloads, and uploaded media files are never transmitted to external remote servers, ensuring maximum privacy and data security.
JSON & Data Tools
Format, minify, validate, and convert JSON payloads instantly with interactive collapsible tree views, color syntax highlighting, and fast error diagnostics.
Text & Formatting Tools
Clean, transform, diff, encode, and decode text instantly. Includes Base64 converters, URL encoders, word counters, line sorting tools, and case converters.
Image & PDF Tools
Compress, resize, merge, and split PDF documents and images locally without quality degradation or server upload wait times.