Text & String
Format, transform, compare, and count — everything text.
JSON Formatter & Validator
Format, prettify, and validate massive JSON strings instantly. No server round-trips — entirely client-side.
API Client — Postman Alternative
Test REST APIs directly in your browser. Supports all HTTP methods, headers, auth, collections, history, and environment variables.
JSON ↔ XML Converter
Convert JSON to XML and XML to JSON instantly. Two-way conversion with formatting, validation, and 100% browser-based privacy — no data ever leaves your device.
JSON ↔ YAML Converter
Convert JSON to YAML and YAML to JSON instantly. Perfect for Kubernetes, Docker Compose, CI/CD configs, and API specs. 100% browser-based — private and free.
CSV ↔ JSON Converter
Convert CSV to JSON and JSON to CSV instantly. Handles headers, nested objects, and custom delimiters. Perfect for data migration and API work. 100% browser-based.
Text Case Converter
Instantly convert strings between camelCase, snake_case, PascalCase, UPPER CASE, and more.
Diff Checker
Compare two strings or code blocks to find exact differences line by line with color highlighting.
Regex Tester
Test your regular expressions against sample text in real-time with live match highlighting.
Markdown Preview
Write and preview Markdown in real time. Convert Markdown to HTML with a live editor, toolbar, and instant rendering.
Word & Character Counter
Count words, characters, sentences, and paragraphs. See reading time, speaking time, and keyword density.
URL Parser
Break down complex URLs into individual components — query params, protocol, host, and more.
Why Use Text & String Tools?
Text and string manipulation is one of the most common tasks in software development. Whether you are debugging an API response, reformatting variable names, comparing two versions of a file, or testing a complex regular expression, having fast, reliable, and privacy-respecting tools at your fingertips saves hours every week.
Our Text & String tools are built with three principles in mind: speed, privacy, and usability. Every tool runs entirely in your browser using modern JavaScript — there are no server round-trips, no data uploads, and no waiting. You can paste multi-megabyte JSON files, test regex patterns against large text blocks, and compare thousands of lines of code without ever sending your data to a remote server. This makes our tools safe to use with proprietary source code, confidential documents, and sensitive configuration data.
Beyond privacy, every tool is designed to be beautiful and a joy to use. Syntax highlighting, real-time feedback, keyboard shortcuts, and responsive layouts work seamlessly on desktop, tablet, and mobile. Whether you are a frontend engineer, backend developer, data analyst, or technical writer, these tools will become part of your daily workflow.
Who Are These Tools For?
These tools are perfect for frontend and backend developers, data analysts, technical writers, content creators, and students. If you work with text, code, or structured data in any form, you will find value here. JSON Formatter is a must-have for anyone working with REST APIs. Text Case Converter is essential for programmers who juggle camelCase, snake_case, and kebab-case conventions across different languages and frameworks. Diff Checker is invaluable during code reviews and merging. Regex Tester makes learning and debugging regular expressions effortless. And Word Counter is indispensable for writers, SEO specialists, and students working on essays and reports.
Frequently Asked Questions
Are these text tools free to use?
Yes, every tool in the Text & String category is 100% free with no signup required. We sustain the project through non-intrusive advertising and do not charge for any feature.
Is my text data safe when using these tools?
Absolutely. All processing happens entirely in your browser using JavaScript. Your text, code, and JSON data are never uploaded to our servers, making these tools safe for sensitive information like API keys, proprietary source code, and confidential documents.
What is the maximum file size supported?
Since processing runs in your browser, the limit depends on your device's memory. Most modern devices can handle files of several megabytes without any issues — including JSON files with tens of thousands of lines and text documents with hundreds of thousands of characters.
Do these tools work offline?
Once a tool page is loaded, it continues to work even if you lose internet connection because all processing is client-side. You only need an initial connection to load the page — after that, the tool runs entirely on your device.