Developer Tools

A robust collection of developer and text manipulation tools to format JSON, generate passwords, count words, and convert text case.

Word & Char Counter

Count words, characters, and estimate read time.

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Case Converter

Easily convert text to uppercase, lowercase, etc.

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Password Generator

Instantly create random, secure passwords.

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JSON Formatter

Beautify, validate, and format JSON code easily.

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Slug Generator

Convert text or titles into SEO-friendly URL slugs.

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Random Number Generator

Generate true random numbers instantly.

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Comma Separator

Convert lists into continuous text with custom delimiters.

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Text Compare

Compare two texts side-by-side and find differences.

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Text Sorter

Sort text alphabetically, reverse, or randomize lines.

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Base64 Converter

Encode or decode text to and from Base64 format.

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Why Use Sellooo for Developer Tools?

Our suite of developer tools is designed to provide you with the most efficient experience possible. Whether you are handling sensitive documents or optimizing images for the web, Sellooo ensures total privacy and top-tier performance.

All processing is done securely, and your files are never stored on our servers longer than necessary. We focus on providing high-quality results equivalent to premium software, but for absolutely free.

100% Free & Private

No hidden fees, no registration, and no data storage. Your privacy is our priority.

Fast & Reliable

All tools are optimized for speed and accuracy. Get results in seconds, not minutes.

Works Everywhere

Fully responsive design works on desktop, tablet, and mobile. No app installation needed.

Frequently Asked Questions About Developer Tools

Find answers to common questions about our developer tools and how they can help you.

Absolutely. Our tools are used by thousands of developers daily. They run locally in your browser, ensuring your code and data never leave your machine.

Once the page loads, most tools work offline since they run entirely in your browser. Perfect for developers working in secure environments.

Still have questions? Contact us and we'll be happy to help.