Free Developer Tools

Code Formatter

Beautify JSON, HTML, CSS, JS, SQL, XML, PHP

Regex Tester

Test and debug regular expressions with live matches

Base64 Encoder / Decoder

Encode and decode Base64 strings instantly

Binary / Hex Converter

Convert between binary, hex, octal, and decimal

URL Encoder / Decoder

Encode and decode URL-safe percent-encoded strings

JSON to CSV Converter

Flatten JSON arrays into downloadable CSV files

JSONPath Tester

Query JSON with JSONPath expressions live

JSON Schema Validator

Validate JSON against a JSON Schema draft

Cron Expression Builder

Build and explain cron schedules visually

Text Diff Checker

Compare two blocks of text line-by-line

Live HTML Viewer

Preview and edit HTML with live render

HTTP Status Code Reference

Every HTTP status code explained with examples

Webhook Inspector

Parse and explore webhook payloads visually

UUID Generator

Generate v4 UUIDs in bulk, client-side

IP Address Lookup

Geo-locate any IP: country, city, ASN, org

Robots.txt Generator

Build a robots.txt with bot-specific rules

XML Sitemap Generator

Generate a valid sitemap.xml from a URL list

.htaccess Builder

Build Apache redirect and rewrite rules visually

Line Break Converter

Convert between CRLF, LF, and CR line endings

Secure .env Generator

Generate secrets and .env files with one click

Schema Markup Generator

Generate JSON-LD structured data for rich search results

Incident Response Writer

Generate a structured incident report with timeline

RCA Generator

Build a root cause analysis with 5-Why chain

Viewport & Screen Inspector

Detect viewport, DPR, screen size, and device capabilities

Uptime SLA Calculator

Convert SLA percentages into real downtime budgets

API Rate Limit Calculator

Check if traffic fits within API rate limits

Website Speed Test

Test LCP, FCP, CLS & TTFB with Lighthouse-powered insights

Docker Image Size Estimator

Estimate Docker image size from base + layers