Simple tools for everyday development.

Open a tool, finish the task, and get back to work—without installs or signups.

105 toolsNo signupLocal-first

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105 tools

AI

AI Prompt PII & Secret Leak Scanner

Detect and redact sensitive data before sharing AI prompts

AI Coding Prompt Generator

Choose what you want the AI to do and get a prompt structured for that coding task.

LLM Cost & Context Planner

Estimate prompt, agent, and production LLM costs before you run them

AI Coding Tools Directory

Find the right AI tool for coding, reviewing, testing, debugging, and shipping software

AI Usage & Rate Limit Tracker

See every AI coding quota, reset, usage pace, and capacity risk in one local-first dashboard

Product & Analytics

Mixpanel Toolkit

Local Mixpanel event sandbox

Engineering Task Compiler

Compile rough requirements into execution-ready engineering tasks.

PRD Generator

Create, save, and reopen structured PRDs in your browser, starting blank or from complete template PRDs

Converters

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

Code Generators

JSON to TypeScript

Generate TypeScript interfaces

UUID/GUID Generator

Generate unique identifiers instantly

Fake Data Generator

Generate mock data

XML to Java Class Converter

Convert XML to annotated Java classes with JAXB & Lombok support

Form Validation Generator

Design validation once and generate framework-neutral code.

Editors

Markdown Editor & Previewer

Live markdown editor with preview

CSV Editor

Edit CSV files like a spreadsheet

YAML Viewer

View, parse, and validate YAML with tree view

HTML CSS JS Playground

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

Formatters

JSON Formatter

Format and beautify JSON data

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

Debug & Validate

JSON Schema Validator

Validate JSON against schemas

Regex Tester

Test regular expressions interactively

Source Map Stack Trace Resolver

Decode minified stack traces with source maps

Diff

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

PDF Diff Checker

Compare PDF text, pages, and visual changes locally

API

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

cURL to Code Converter

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

HAR to Markdown

Compile sanitized network logs for backend debugging and AI agents

HAR to OpenAPI

Generate a reviewable OpenAPI contract from sanitized browser traffic

Web Detectors

Web Technologies Detector

Find a website's publicly detectable tech stack with evidence

Subdomain Finder

Find public subdomains and verify DNS records

Security

JWT Decoder

Decode JWT tokens

Password Generator

Generate secure passwords

JWT Generator

Generate JWT tokens with HS256

Password Strength Checker

Test password strength and predictable patterns privately

PDF PII & Secret Redactor

Detect and permanently remove secrets before sharing a PDF

Encoding & Hashing

Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 back to text

URL Encoder & Decoder

Encode text to URL-safe format or decode percent-encoded strings back to text

HTML Escape & Unescape

Encode HTML entities or decode them back — in one workspace

MD5 Generator

Generate MD5 hash from text or files

SHA256 Hash Generator

Generate SHA256 hashes

SHA512 Hash Generator

Generate SHA512 hashes

Image ↔ Base64 Converter

Convert images to Base64 and decode Base64 back to images

Developer Workflow

Commit Message Generator

Generate conventional commits

Cron Expression Generator

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

Gitignore Generator

Generate production-ready .gitignore files for any tech stack

SemVer Release Advisor

Decide the exact next version from your release changes

Local Port Scanner

Automatically find localhost development servers

Dev Service Status

Check GitHub, OpenAI, Claude, Vercel, Cloudflare, npm and other developer services in one place.

Git Worktree Generator

Visual Git worktree workflow planner and command generator

SEO

Schema Markup Validator

Validate JSON-LD schema markup and rich result readiness

Broken Link Checker & Cleaner

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

Open Graph Previewer

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

Open Graph Image Builder

Create branded social preview images and metadata-ready assets

Social Media

GitHub Profile README Builder

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

Profile Picture Badge Generator

Add an available-for-work, hiring, freelancer, event, or custom badge to your profile picture.

LinkedIn Carousel Generator

Design editable LinkedIn PDF carousels in a horizontal WYSIWYG workspace

Text

String Case Converter

Convert text case formats

Lorem Ipsum Generator

Generate placeholder text for your designs instantly

Word Counter

Count words, characters, sentences and paragraphs instantly

Tech Workplace Dictionary

Understand the terminology, acronyms, jargon, and phrases used by modern tech teams

Documents

HTML to Markdown Converter

Convert HTML and webpages into clean Markdown

ATS CV/Resume Builder

Create, verify, score, and export an ATS-friendly resume

PDF to Markdown

Convert PDFs into clean, AI-ready Markdown for coding agents

Images

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

Screenshot Full Webpage

Capture public webpages as full-page or viewport images

Screenshot Image Annotator

Highlight, explain, redact, and present screenshots

Markdown to Infographic

Turn structured Markdown into editable, deterministic infographics

Color

Color Converter

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

Transfer & Calls

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.

Animated QR File Transfer

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

Media

Video Picture-in-Picture

Keep a local video, direct URL, webcam, or screen capture visible while you work.

Music Player

Play private local audio, arrange a playlist, and keep compact controls visible while you work.

Time

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

Work Hours Calculator

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

Stopwatch

Measure drift-free elapsed time, record lap statistics, and save or export sessions locally.

Event Countdown

Create precise, time-zone-aware countdowns, count-ups, and date-range progress trackers.

Productivity

Document Picture-in-Picture

Upload or open a document and keep its scrollable preview visible while you work.

Floating Notes

Write private notes and checklists that autosave locally and stay visible in a floating view.

Pomodoro Timer

Run accurate focus and break cycles, track daily progress, and keep the timer visible.

Utilities

Array Sorter & Shuffler

Sort and shuffle arrays and objects

ZIP with Password

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

Internet Speed Test

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

Wheel of Names

Random Name Picker & Wheel Spinner

Numbers

Unit Converter

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

Decimal Precision Calculator

Precise decimal calculations

Number to Words Converter

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

Finance

Currency Formatter

Format currency values

Invoice Generator

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