Stop pasting API keys, tokens, and configs into sketchy online tools.
106 dev tools. One tab.
Nothing leaves your browser.
Format, encode, convert, generate, test, and reference — all client-side. AI tools, Web3 utilities, cheatsheets, and more. No signup. No server. Free.
Format & Validate
Clean up, beautify, and validate code
JSON Formatter & Validator
Format, validate, and minify JSON with real-time error detection.
SQL Formatter
Format and beautify SQL queries with keyword uppercasing and indentation.
Markdown Preview
Write Markdown and see live rendered HTML preview side by side.
YAML Formatter & Validator
Format and validate YAML. Detect syntax errors and convert to JSON.
HTML Formatter & Minifier
Format, beautify, and minify HTML. Auto-indent tags and attributes.
CSS Formatter & Minifier
Format and minify CSS. Beautify or compress stylesheets instantly.
Encode & Decode
Transform between formats and encodings
Base64 Encode / Decode
Encode text to Base64 or decode Base64 to text with full UTF-8 support.
URL Encode / Decode
Encode or decode URL components. Handles special characters and Unicode.
JWT Decoder
Decode JSON Web Tokens to inspect header, payload, and expiration.
Image to Base64
Convert images to Base64 data URLs. Supports PNG, JPG, SVG, GIF, WebP.
HTML Entity Encoder / Decoder
Encode special characters to HTML entities and decode them back.
Convert
Convert between types, units, and formats
Timestamp Converter
Convert Unix timestamps to dates and back. Live clock with calendar picker.
JSON ↔ CSV Converter
Convert between JSON arrays and CSV. Handles nested objects and quoted fields.
Text Case Converter
Convert text to UPPERCASE, camelCase, snake_case, kebab-case, and more.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal instantly.
Color Converter
Convert between HEX, RGB, and HSL color formats with live preview.
Cron Expression Parser
Parse cron expressions into human-readable schedules. See next run times.
JSON ↔ YAML Converter
Convert between JSON and YAML formats instantly. Bidirectional.
XML ↔ JSON Converter
Convert between XML and JSON. Parse attributes and nested elements.
TOML ↔ JSON Converter
Convert between TOML and JSON. Parse config files and data structures.
Byte / Size Converter
Convert between bytes, KB, MB, GB, TB and binary units (KiB, MiB, GiB).
cURL to Fetch Converter
Convert cURL commands to JavaScript fetch() or async/await code.
Chmod / Permission Calculator
Calculate Unix file permissions. Visual, octal, and symbolic modes.
HTML to JSX Converter
Convert HTML to valid JSX — class→className, inline styles, self-closing tags, event handlers.
JSON ↔ JSONL Converter
Convert JSON arrays to JSONL (newline-delimited JSON) and back. Ideal for AI/ML datasets.
Bitwise Calculator
Perform AND, OR, XOR, NOT, left/right shift operations. View results in binary, hex, and decimal side by side.
Memory Address Converter
Convert memory addresses between hex, decimal, and binary. Calculate offsets, pointer arithmetic, and alignment.
CIDR / Subnet Calculator
Calculate network address, broadcast, subnet mask, wildcard mask, host range, and binary bits for any IPv4 CIDR block.
.env File Parser
Parse .env files and convert to JSON, YAML, bash export statements, or a JS object. Filter, search, and add variables.
Unicode / UTF-8 Inspector
Inspect text character by character — Unicode code points, UTF-8 bytes, HTML entities, and JavaScript escape sequences.
JSON to TypeScript Interface
Convert JSON objects to TypeScript interfaces and types instantly. Handles nested objects, arrays, null values, and optional fields.
CSS Unit Converter
Convert between px, rem, em, vw, vh, pt, and cm. Set base font size and viewport. Tailwind spacing reference included.
Test & Compare
Test patterns, compare text, reference codes
Regex Tester
Test regular expressions in real time with match highlighting and capture groups.
Text Diff Checker
Compare two texts side by side with highlighted additions and deletions.
Color Contrast Checker
Check foreground/background color contrast ratios for WCAG AA and AAA accessibility compliance.
JSONPath Tester
Test JSONPath expressions against JSON data. See matching results instantly in the browser.
HTTP Header Inspector
Paste raw HTTP headers and instantly parse them into a structured table with descriptions.
HTML Head Cleaner
Audit and clean your HTML <head>. Detect missing tags, duplicates, and SEO issues.
Password Strength Checker
Analyze password strength with entropy calculation, pattern detection, and time-to-crack estimates.
CPU Scheduling Simulator
Simulate FCFS, SJF, Priority, and Round Robin CPU scheduling. View Gantt charts, waiting time, and turnaround time.
JSON Schema Validator
Validate JSON data against a JSON Schema (Draft-07). Real-time validation with detailed error paths and messages.
SSL Certificate Decoder
Decode PEM SSL/TLS certificates. View subject, issuer, expiry, SANs, serial number, and SHA-256 fingerprint — all client-side.
OpenAPI / Swagger Validator
Validate OpenAPI 3.0 and Swagger 2.0 specs. Check required fields, $ref resolution, operation IDs, and HTTP codes.
HTML Email Preview
Preview HTML email templates in desktop and mobile views. Mock Gmail chrome, variable replacement, and sample templates.
Word & Character Counter
Count words, characters, sentences, paragraphs, and reading time. Keyword density analysis. Works with any language.
HTTP Security Headers Analyzer
Audit HTTP security headers against OWASP best practices. Get a grade (A+–F) and fix recommendations for HSTS, CSP, X-Frame-Options, and more.
Generate
Create hashes, IDs, tokens, and text
Hash Generator
Generate SHA-1, SHA-256, SHA-512 hashes and verify integrity.
Password Generator
Generate strong, cryptographically secure passwords with customizable rules.
UUID Generator
Generate UUID v4 instantly. Bulk generate, copy, and use in your projects.
Lorem Ipsum Generator
Generate placeholder text — paragraphs, sentences, or words. Clean output.
JWT Builder / Generator
Build and sign JWT tokens with custom claims. HS256 in-browser signing.
ASCII Art / Text Banner
Convert text to ASCII art banners. Multiple styles and fonts.
.gitignore Generator
Generate .gitignore files for any tech stack — Node, Python, React, Go, Rust, Java, and more.
OG / Meta Tag Generator
Generate Open Graph, Twitter Card, and HTML meta tags ready to paste into your <head>.
CSP Header Builder
Build Content-Security-Policy headers visually. Toggle directives, add sources, copy the header.
Responsive Navbar Builder
Build a responsive navbar visually and export clean HTML/Tailwind CSS code instantly.
Footer Generator
Build a multi-column site footer visually and export clean HTML/Tailwind CSS code.
AI Prompt Formatter
Format prompts for ChatML, Claude, Llama, Mistral, and Gemini. Toggle system/user/assistant roles.
CRC Calculator
Calculate CRC-8, CRC-16, and CRC-32 checksums for data integrity verification. Multiple polynomial presets.
Color Palette Generator
Generate complementary, triadic, analogous, and monochromatic color palettes from any seed color. Export as CSS variables or Tailwind config.
SVG Optimizer / Minifier
Optimize and minify SVG files. Remove editor metadata, comments, and unnecessary attributes. See size savings instantly.
CSS Box Shadow Generator
Generate CSS box shadows visually with live preview. Multi-layer shadows, presets, and one-click copy.
CSS Gradient Generator
Generate linear, radial, and conic CSS gradients visually. Choose colors, stops, and direction with a live preview.
Robots.txt Generator
Build robots.txt files visually. Add user-agent rules, Allow/Disallow paths, sitemaps, and block AI crawlers with one click.
Sitemap XML Generator
Generate XML sitemaps from a list of URLs. Set priority, change frequency, and last modified dates. Download as sitemap.xml.
Color Shades Generator
Generate Tailwind-style 11-shade palettes (50–950) from any hex color. Copy as Tailwind config, hex values, or HSL.
References & Docs
Searchable cheatsheets and language references
HTTP Status Code Reference
Lookup HTTP status codes. Descriptions, use cases, and response categories.
Git Commands Cheatsheet
70+ Git commands with examples. Common scenarios and rescue guides for when things go wrong.
HTTP Headers Reference
Lookup common HTTP request and response headers with descriptions and examples.
GraphQL Reference
Complete GraphQL syntax reference — queries, mutations, subscriptions, fragments, directives, and real examples.
Protobuf & gRPC Reference
Protocol Buffers 3 and gRPC reference. Scalar types, message definitions, service patterns, and examples.
Docker Commands Cheatsheet
80+ Docker commands — images, containers, volumes, networks, and Compose. Click any card to copy.
Bash / Shell Cheatsheet
85+ Bash and shell commands — navigation, grep, sed, awk, processes, networking, and scripting.
TypeScript Cheatsheet
Complete TypeScript reference — types, interfaces, generics, utility types, enums, and more with examples.
React Hooks Reference
Complete React Hooks reference — useState, useEffect, useCallback, useMemo, useRef, useContext, and custom hooks.
CSS Flexbox Cheatsheet
Visual CSS Flexbox reference — all container and item properties with live preview examples.
CSS Grid Cheatsheet
Visual CSS Grid reference — grid container, track sizing, template areas, and alignment properties.
SQL Cheatsheet
Complete SQL reference — SELECT, JOINs, GROUP BY, window functions, subqueries, and common patterns.
VS Code Shortcuts
Complete VS Code keyboard shortcuts for Mac, Windows, and Linux — searchable and copy-ready.
Async / Lambda / Threading Reference
Language-by-language reference for async/await, lambdas, threading, and try/catch — JS, Python, Go, Rust, Java.
Tailwind CSS Cheatsheet
Complete searchable Tailwind CSS v3 reference — layout, spacing, typography, flexbox, grid, colors, borders, and more.
MIME Type Lookup
Search 120+ MIME types by file extension or content type. Get correct Content-Type headers for images, video, audio, fonts, and more.
Python Cheatsheet
Searchable Python reference with 70+ snippets across 11 categories — strings, lists, dicts, classes, decorators, file I/O, error handling, and built-ins.
Regex Quick Reference
Complete regular expression reference — anchors, character classes, quantifiers, groups, lookarounds, flags, and 15 common patterns with live links to the tester.
kubectl Cheatsheet
100+ kubectl commands across 11 categories — pods, deployments, services, config & secrets, namespaces, logs, rollouts, RBAC, and useful flags.
Vim Cheatsheet
130+ Vim commands color-coded by mode — Normal, Insert, Visual, and Command. Covers motions, editing, search, splits, macros, and registers.
JavaScript Array Methods
All 60+ JavaScript array, string, and object methods with syntax, examples, and ES2020+ additions. Filter by mutating, non-mutating, or iteration methods.
PostgreSQL Cheatsheet
110+ PostgreSQL commands — psql CLI, data types, DDL, DML, indexes, JOINs, CTEs, window functions, JSON/arrays, roles, and performance tips.
AI & ML Tools
NewTools for AI engineers — prompts, datasets, models, and evaluation
Prompt Token Counter
Estimate token count for GPT-4, Claude, Llama, and Gemini. See cost estimates for your prompts.
Text Dataset Cleaner
Clean raw text datasets — strip HTML, URLs, whitespace, deduplicate, and filter by length.
Label Encoder
Encode categorical labels to integers or one-hot vectors. Export mapping as CSV or JSON.
AI Dataset Size Calculator
Calculate token counts, storage size, and fine-tuning cost estimates for AI/ML datasets.
Embedding Visualizer
Visualize 2D embeddings as an interactive scatter plot. Paste your x/y coordinates and labels.
Confusion Matrix Visualizer
Build and visualize a confusion matrix. Auto-calculates accuracy, precision, recall, and F1 score.
Outlier Detection Tool
Detect outliers in your dataset using IQR, Z-score, and Modified Z-score methods. Visualize with box plots.
Data Normalization Tool
Normalize numerical data with Min-Max scaling, Z-score standardization, or Robust scaling. See before/after stats.
Blockchain & Web3
NewEthereum, Bitcoin, and Web3 developer utilities — addresses, hashes, ABI, gas
Wallet Address Validator
Validate Ethereum, Bitcoin, and Solana wallet addresses. Verifies checksum, format, and network type.
Gas Fee Calculator
Calculate Ethereum gas fees in Gwei, ETH, and USD. Estimate costs for transfers, ERC-20 approvals, and contract calls.
ABI Encoder / Decoder
Encode and decode Ethereum smart contract ABI calls. Paste function signatures and encode parameters.
Keccak Hash Generator
Generate Keccak-256 and Keccak-512 hashes used in Ethereum. Includes SHA-3 variants for comparison.
Base58 Converter
Encode and decode Base58 and Base58Check (Bitcoin's address encoding). Compare with Base64.
Token Unit Converter
Convert between ETH, Gwei, Wei, MATIC, SOL, and Satoshi units instantly. Essential for DeFi and smart contract dev.
Merkle Tree Generator
Generate a Merkle tree from a list of leaves. View the tree structure, root hash, and proof paths.
Blockchain Timestamp Converter
Convert Unix block timestamps to human-readable dates. Look up Ethereum block times and estimate past/future blocks.
EVM Bytecode Viewer
Decode EVM bytecode into human-readable opcodes. Analyze smart contract deployment bytecode.
ETH Address Toolkit
Convert Ethereum addresses between formats — checksummed (EIP-55), lowercase, bytes32. Validate and inspect.
From the same team
InvoiceGrid — Track invoices, analyze your AR, and chase overdue payments.
The layer between your invoicing tool and actually getting paid.