CodingTool
Free · No sign-up · 50+ tools

Your Developer
Toolkit, online.

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

73+Free tools
17Workflows
0Sign-ups needed
All tools73 tools

AI Tools

3 tools

AI Prompt PII & Secret Leak Scanner

Detect and redact sensitive data before sharing AI prompts

AI Coding Prompt Generator

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

Task Handoff Compiler

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

JSON Tools

4 tools

JSON Formatter

Format and beautify JSON data

JSON Schema Validator

Validate JSON against schemas

JSON to TypeScript

Generate TypeScript interfaces

Array Sorter & Shuffler

Sort and shuffle arrays and objects

CSV & Tables

2 tools

CSV ⇄ JSON Converter

Convert between CSV and JSON

CSV Editor

Edit CSV files like a spreadsheet

XML & YAML

4 tools

YAML ⇄ JSON Converter

Convert between YAML and JSON

XML ⇄ JSON Converter

Convert between XML and JSON formats

YAML Viewer

View, parse, and validate YAML with tree view

XML to Java Class Converter

Convert XML to annotated Java classes with JAXB & Lombok support

Web & Code

8 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

Regex Tester

Test regular expressions interactively

Schema Markup Validator

Validate JSON-LD schema markup and rich result readiness

Source Map Stack Trace Resolver

Decode minified stack traces with source maps

Color Converter

Convert colors across CSS, mobile, and design-token formats

HTML CSS JS Playground

Write frontend code, run it safely, and debug the result in your browser.

Text & Markdown

1 tools

String Case Converter

Convert text case formats

Images & QR

7 tools

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

Image to WebP Converter

Convert images to WebP format instantly in your browser

Screenshot to Text & Code

Extract text and code from screenshots with local OCR

Open Graph Previewer

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

Screenshot Full Webpage

Capture public webpages as full-page or viewport images

Animated QR File Transfer

Transfer small files through animated QR codes with no upload, account, network, or pairing.

Numbers & Units

3 tools

Age Calculator

Calculate age from birth date

Unit Converter

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

Decimal Precision Calculator

Precise decimal calculations

Hashing

3 tools

MD5 Generator

Generate MD5 hash from text or files

SHA256 Hash Generator

Generate SHA256 hashes

SHA512 Hash Generator

Generate SHA512 hashes

Encoding & Escaping

4 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

Image ↔ Base64 Converter

Convert images to Base64 and decode Base64 back to images

Credentials & Privacy

5 tools

JWT Decoder

Decode JWT tokens

Password Generator

Generate secure passwords

JWT Generator

Generate JWT tokens with HS256

ENV Diff Comparator

Compare, audit & merge .env files with secret detection

ZIP with Password

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

API & Networking

8 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

Internet Speed Test

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

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.

Browser Video Call

Make a direct one-to-one P2P video call with screen sharing and private browser-to-browser chat.

cURL to Code Converter

Convert HTTP requests across cURL, code, HAR, and structured formats with local secret protection.

Time & Scheduling

4 tools

Unix Timestamp Converter

Convert timestamps to dates

Timezone Converter

Convert between timezones

ISO8601 Formatter

Format and parse ISO8601 dates

Cron Expression Generator

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

Document

4 tools

Markdown Editor & Previewer

Live markdown editor with preview

Lorem Ipsum Generator

Generate placeholder text for your designs instantly

Word Counter

Count words, characters, sentences and paragraphs instantly

HTML to Markdown Converter

Convert HTML and webpages into clean Markdown

Financial

4 tools

Currency Formatter

Format currency values

Number to Words Converter

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

Work Hours Calculator

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

Invoice Generator

Create professional PDF invoices locally with accurate totals, branding, and reusable history.

Developer Workflow

5 tools

UUID/GUID Generator

Generate unique identifiers instantly

Fake Data Generator

Generate mock data

Commit Message Generator

Generate conventional commits

Gitignore Generator

Generate production-ready .gitignore files for any tech stack

GitHub Profile README Builder

Build a credible, project-first GitHub profile README that stays clean and GitHub-safe

Compare & Validate

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

Broken Link Checker & Cleaner

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