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Free, fast, and practical developer tools that run instantly in your browser. JSON, encoding, hashing, time, and more.

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Transform Data

16 tools

JSON Formatter

Format and beautify JSON data

YAML ⇄ JSON Converter

Convert between YAML and JSON

CSV ⇄ JSON Converter

Convert between CSV and JSON

XML ⇄ JSON Converter

Convert between XML and JSON formats

JSON to TypeScript

Generate TypeScript interfaces

String Case Converter

Convert text case formats

Unit Converter

Developer-focused unit converter for data sizes, rates, time, and more

CSV Editor

Edit CSV files like a spreadsheet

Currency Formatter

Format currency values

Array Sorter & Shuffler

Sort and shuffle arrays and objects

YAML Viewer

View, parse, and validate YAML with tree view

Number to Words Converter

Convert numbers to words in English and Indonesian with currency and check writing support

XML to Java Class Converter

Convert XML to annotated Java classes with JAXB & Lombok support

Image to WebP Converter

Convert images to WebP format instantly in your browser

HTML to Markdown Converter

Convert HTML and webpages into clean Markdown

Screenshot to Text & Code

Extract text and code from screenshots with local OCR

Format Code

4 tools

JavaScript Beautifier & Minifier

Format or minify JavaScript

CSS Beautifier & Minifier

Format, optimize, and minify CSS code

HTML Beautifier & Minifier

Format, optimize, and minify HTML code

Markdown Editor & Previewer

Live markdown editor with preview

Validate & Inspect

10 tools

JSON Schema Validator

Validate JSON against schemas

Regex Tester

Test regular expressions interactively

Decimal Precision Calculator

Precise decimal calculations

Word Counter

Count words, characters, sentences and paragraphs instantly

Schema Markup Validator

Validate JSON-LD schema markup and rich result readiness

Source Map Stack Trace Resolver

Decode minified stack traces with source maps

Broken Link Checker & Cleaner

Find, remove, and replace dead URLs from text, files, and webpages

Internet Speed Test

Check download speed, latency, jitter, and upload availability from your browser

Open Graph Previewer

Preview social cards and debug Open Graph, Twitter Card, and HTML metadata

Task Handoff Compiler

Turn messy requirements into an execution-ready engineering handoff with readiness checks, scope guards, and validation plans.

Compare Files

4 tools

Code Diff Checker

Compare code/text side-by-side

JSON Diff Checker

Spot every change between two JSON objects instantly

CSV Diff Checker

Compare two CSV files with key-based diff and field-level change detection

ENV Diff Comparator

Compare, audit & merge .env files with secret detection

Generate Assets

10 tools

UUID/GUID Generator

Generate unique identifiers instantly

Fake Data Generator

Generate mock data

Commit Message Generator

Generate conventional commits

Lorem Ipsum Generator

Generate placeholder text for your designs instantly

QR Code Generator

Generate QR codes instantly from URLs, text, or JSON — no backend needed

Code Screenshot Generator

Create beautiful, shareable images of your code

Gitignore Generator

Generate production-ready .gitignore files for any tech stack

GitHub Profile README Builder

Build a modular GitHub profile README with live preview

Screenshot Full Webpage

Capture public webpages as full-page or viewport images

AI Coding Prompt Generator

Build clear, validated coding prompts for your favorite AI assistant.

Debug APIs

5 tools

HTTP Header Parser

Parse HTTP headers

Swagger / OpenAPI Viewer

Visualize and explore OpenAPI 3.x and Swagger 2.0 specs instantly

Mini Postman (API Tester)

Test REST APIs directly in your browser — no install needed

Mixpanel Toolkit

Local Mixpanel event sandbox

Browser P2P File Transfer

Send files directly between two browsers using WebRTC. No upload, no account, no server storage.

Security & Encoding

12 tools

Base64 Encoder/Decoder

Encode and decode Base64 strings online

URL Encoder/Decoder

Encode and decode URLs safely

HTML Escape / Unescape

Encode and decode HTML entities online

MD5 Generator

Generate MD5 hash from text or files

SHA256 Hash Generator

Generate SHA256 hashes

SHA512 Hash Generator

Generate SHA512 hashes

JWT Decoder

Decode JWT tokens

Password Generator

Generate secure passwords

JWT Generator

Generate JWT tokens with HS256

ZIP with Password

Compress & encrypt files locally — no upload, no server.

Image ↔ Base64 Converter

Convert images to Base64 and decode Base64 back to images

AI Prompt PII & Secret Leak Scanner

Detect and redact sensitive data before sharing AI prompts

Scheduling & Time

6 tools

Unix Timestamp Converter

Convert timestamps to dates

Timezone Converter

Convert between timezones

ISO8601 Formatter

Format and parse ISO8601 dates

Age Calculator

Calculate age from birth date

Cron Expression Generator

Build, validate, and visualize cron schedules with timezone-aware simulation

Work Hours Calculator

Calculate work hours, WFO/WFH count, leave, business trips, client visits, and overtime using your company rules.