Timestamp Converter
Convert Unix / epoch timestamps to dates, dates to epoch, and view any moment across 30+ world timezones instantly.
Open ToolDeveloper Tools
Handy browser-based utilities for developers — convert data, test patterns, and pick colours without leaving your workflow.
JSON to CSV Converter
Paste any JSON array and download a perfectly formatted CSV in one click. Handles nested values and special characters.
Open ToolRegex Tester
Write and test regular expressions with live match highlighting, match count, and support for all JS regex flags.
Open ToolColor Converter
Instantly convert between HEX, RGB, and HSL colour formats with a live visual preview of your colour.
Open ToolFree Online Developer Tools — Fast, No-Login Utilities for Developers
Writing, debugging, and converting data are everyday tasks for developers — but switching between multiple tabs, installing browser extensions, or signing into yet another web app slows you down. civvy.tech's free developer tools are designed to handle your most common coding tasks instantly, right in your browser, with no account required. From JSON to CSV conversion to regex testing to colour format conversion — everything is one click away.
JSON to CSV Converter — Export Structured Data Instantly
Our JSON to CSV converter is one of the most useful daily-use developer tools available. Paste any valid JSON array and instantly get a clean, downloadable CSV file. The tool handles nested objects, arrays of objects, and mixed data types — making it ideal for exporting API response data, preparing datasets for Excel or Google Sheets, or debugging data pipeline outputs. No server upload, no size limit for typical use cases, all processing happens client-side.
Regex Tester — Debug Regular Expressions with Live Highlighting
Debugging regular expressions by trial and error is slow and error-prone. Our online regex tester shows live match highlighting as you type, with match count and support for all standard JavaScript regex flags (g, i, m, s, u, y). Whether you're writing input validation patterns, parsing log files, or building a text processing pipeline, this tool helps you iterate on your regex quickly and confidently. It works with JavaScript regex syntax, which is also compatible with many other languages.
Color Converter — HEX, RGB, and HSL in Seconds
Front-end developers and designers constantly need to switch between colour formats. Our colour format converter lets you input a HEX code, RGB value, or HSL string and instantly converts it to all three formats simultaneously, with a live colour preview. No more manually calculating the conversion — paste your colour value in any format and copy the output in the format your codebase requires.
Unix Timestamp Converter — Decode Epoch Time Instantly
Unix timestamps appear constantly in APIs, databases, log files, and system outputs. Our Unix timestamp converter converts any epoch timestamp to a readable date and time, and displays it across 30+ world time zones simultaneously. You can also convert a specific date and time back to a Unix timestamp. This tool is essential for debugging time-related bugs in distributed systems, APIs, and scheduled jobs.
More Tools on civvy.tech
Beyond dev utilities, civvy.tech offers free calculators across multiple categories — including finance tools like a loan EMI calculator and currency converter, health tools like a BMI calculator, and home calculators for paint, tiles, and concrete. Browse all tools to find what you need.