All Tools
A categorized list of all 40 developer tools that run entirely in your browser: SQL builder, ER diagrams, JSON converters, JWT, UUID, and more. Nothing you enter is sent to a server.
SQL & Databases3
Visual SQL Builder
Construct complex SQL queries with SELECT, JOIN, and WHERE clauses using an intuitive visual GUI.
SQL Formatter
Format and beautify SQL queries for various dialects (MySQL, PostgreSQL, etc.) instantly.
DDL Builder
Design tables and generate CREATE TABLE statements plus an ER diagram. Also infers columns from a JSON sample.
Diagrams & Visualization4
SQL → ER Diagram
Parse CREATE TABLE statements and automatically generate ER diagrams with relationships for visualization.
GitHub Actions Visualizer
Visualize and build GitHub Actions workflow YAML with interactive diagrams in the browser.
Infrastructure Diagram Builder
Create system architecture and network diagrams with a GUI. Generate Mermaid code and images instantly.
Architecture Diagram Editor
Place icons, group frames and arrows freely to build an architecture diagram, then export it as PNG or SVG.
AI & LLM3
Development & DevOps3
cURL Converter
Convert cURL commands to code in Python, Node, Go, Rust, and more.
chmod Calculator
Calculate and convert Linux file permissions between octal and symbolic formats with a visual UI.
Cron Editor & Parser
Parse Cron expressions into human-readable format and calculate next execution times for schedule verification.
Data Conversion & Schemas8
JSON Formatter
Pretty-print or minify JSON for quick validation of payloads and logs.
JSON → TypeScript
Generate TypeScript interfaces from JSON instantly for API responses and configs, including optional/null hints.
JSON → Zod
Infer Zod schemas from sample JSON for parsing or runtime validation and share contracts quickly.
JSON → OpenAPI
Generate OpenAPI component schemas from example JSON in the browser to prep review-ready drafts.
JSON ⇔ YAML
Paste JSON or YAML and convert both ways with copy helpers for config or docs handoffs.
CSV ⇔ JSON Converter
Convert between CSV and JSON formats with support for custom delimiters and headers.
JSON Schema ⇄ Zod
Convert between JSON Schema and Zod in both directions, and check how required and optional fields map.
Base64 / 58 / 32
Switch tabs to encode or decode with any base in one place while comparing lengths and URL safety.
Security & Cryptography3
JWT Tool
Create and decode HS256-signed tokens in the browser without sending keys out of your session.
Hash & HMAC Generator
Generate SHA-1, SHA-256, SHA-512 hashes and HMAC signatures instantly in the browser for secure data verification.
JWKS Generator
Build RSA key pairs, publish public JWKS, and sign RS256 JWTs locally to rehearse key rotation.
Text & Code Helpers6
Markdown Table Generator
Create and edit Markdown tables visually with CSV import/export and column alignment controls.
Text & Code Suite
Count text, escape HTML/XML, minify CSS/JS, and generate passwords for quick publishing checks.
Regex Tester
Validate patterns, flags, and captured groups in one view to mirror production-like tests.
Diff Viewer
Visualize text changes with inline highlighting to confirm edits before commits or reviews.
Case Converter
Convert identifiers to camelCase, snake_case, kebab-case, and more at once.
UUID Generator
Generate UUIDv4 identifiers and copy instantly for tests or collision checks.
URL, QR & Network5
URL Encode / Decode
Encode or decode URLs without leaving your browser to catch slug issues or encoding gaps.
IP / CIDR Calculator
Compute the network, broadcast, host range, host count and masks from CIDR notation.
URL Params → JSON
Turn query strings into JSON objects for quick inspection when debugging APIs or webhooks.
QR Generator
Turn any text or URL into a QR code and save as PNG for sharing Wi‑Fi setups or quick links.
QR Reader
Scan codes with the browser camera and decode locally without sending images to a server.
Design & UI2
Date & Time3
Time Zone Converter
Swap between any two time zones instantly (default UTC and JST) to sanity-check launch, meeting, or deploy times.
Time Units
Convert milliseconds through weeks at once and compare results for TTLs, delays, and retry windows.
UNIX Timestamp Converter
Convert UNIX timestamps (seconds or milliseconds) to UTC and local time instantly to validate logs and alerts.