Tools & Utilities
Tools for processing, transforming, or inspecting data—format structured JSON trees, encode binary strings, inspect security certificates, and transform text variables locally with complete privacy.
💻 JSON & Data
Random JSON Generator Studio
Generate randomized, syntactically valid JSON payloads and schema mock data for REST APIs, GraphQL stubs, and unit test fixtures. 100% Client-Side.
Interactive JSON Studio & Validator Workspace
Professional online JSON editor to format, validate, minify, diff, and query JSONPath. Convert CSV, XML, and YAML to JSON. Generate TypeScript & Zod types. Free.
🌍 Popular Data Conversions
🔒 Encode / Decode
Base64 Encoder & Decoder Studio
Encode and decode Base64 strings, UTF-8 text, and binary files online. Supports standard RFC 4648, URL-Safe Base64URL, and image Data URIs. 100% Free.
URL Encoder and Decoder Studio
Encode and decode URLs, URI components, and query parameters online. Features RFC 3986 percent-encoding and UTF-8 special character handling. 100% Free.
All-in-One Text Encoder & Transformation Studio
Convert text across Base64, Hexadecimal, Binary, URL percent-encoding, HTML entities, and Rot13 concurrently in real time. 100% Free & Private.
JWT and Base64 URL Encoding Guide
Modern authentication encoding workflows reviewed.
🔄 Convert & Transform
Text Diff & Side-by-Side Comparison Studio
Compare two text documents or code snippets side-by-side online. Highlights line-by-line and character-level additions, deletions, and modifications. Free.
UUID / GUID Generator & Inspection Studio
Generate cryptographically secure UUID v4 (random) and UUID v1 (timestamp) identifiers online. Bulk generation, custom formatting, and validation. Free.
Secure Password Generator Online
Generate strong, cryptographic passwords and Diceware passphrases online. Calculate Shannon entropy bits, customize character sets, and test crack times. 100% private.
Custom Hangman Puzzle Creator & Word Studio
Create custom Hangman word puzzles online. Build custom secret word playlists, add vocabulary hints, set mistake allowances, and generate encrypted challenge links.
Text to Hex Dump & Byte Inspector Studio
Convert text strings to Hexadecimal byte arrays and decode hex dumps online. Inspect memory buffers, 16-byte columnar views, and UTF-8 code points. Free.
Random PIN Generator
Generate random, non-sequential PIN codes for ATM cards, SIM locks, keypad door alarms, and 2FA recovery. Customize length and prevent repeated digits.
Random Number Generator Studio
Generate cryptographically secure random numbers, integer ranges, floating-point decimals, and lottery picks. Uniform mathematical distribution.
Free Online Chart Maker - Create Charts Instantly
Create interactive bar charts, line graphs, pie charts, and doughnut charts online. Import CSV data, customize themes, and export high-res PNG/SVG. Free.
Cron Expression Generator & Schedule Studio
Generate and validate 5-field and 6-field Cron expressions online. Human-readable schedule translations, next execution dates, and Quartz cron support. Free.
Random Word Generator
Generate random English words with filters for parts of speech, word length, starting letters, and themed categories. Built-in dictionary lookups.
Random Noun Generator
Generate random English nouns for fiction world-building, creative writing prompts, Pictionary drawing games, and entity modeling. 100% Free.
Random Verb Generator
Generate strong, kinetic action verbs to revitalize creative writing, eliminate passive voice, and practice ESL grammar conjugations. Free online tool.
Random Adjective Generator
Generate rich, descriptive adjectives for character personalities, sensory descriptions, UI color nuances, and alliterative brand naming. 100% Free.
Random Adverb Generator
Generate random adverbs categorized by manner, frequency, degree, and time. Perfect for dialogue attribution, ESL syntax, and grammar drills.
Random Idiom Generator
Generate random English idioms, colorful proverbs, and figurative expressions with plain-English definitions, origins, and usage examples.
CSS Gradient Generator
Create CSS linear, radial, and conic gradients with multi-color stops, angle rotation, glassmorphism hero backdrops, and cross-browser CSS code export.
Random Name Generator Studio
Generate random real names with multicultural origin filters, gender selection, middle names, and titles. Perfect for fiction character design and test data.
Random Email Generator Studio
Generate random, RFC 5322 compliant fake email addresses for software QA, form validation testing, database seeding, and mock user onboarding. 100% Free.
Random IP Address Generator Studio
Generate random IPv4 and IPv6 addresses for network simulation, firewall rule QA, CIDR subnetting tests, and proxy development. Export to JSON or CSV.
Hexadecimal to Decimal Memory Pointer Studio
Convert Hexadecimal (Base-16) to Decimal (Base-10) and decimal to hex online. Memory address pointer calculations, CSS hex color previews, and BigInt conversion. Free.
Binary to Decimal Bitwise Arithmetic Studio
Convert binary bitstrings to base-10 integers and decimal to binary. Step-by-step 2^n positional weights, signed two's complement, and Horner's polynomial rule. Free.
BCD to Decimal & Decimal to BCD Converter Studio
Convert Binary Coded Decimal (8421 BCD) to decimal numbers and decimal to BCD online. Step-by-step 4-bit nibble encoding, invalid code detection. Free.
Hex to Binary Converter Studio
Convert Hexadecimal (Base-16) to Binary (Base-2) and binary to hex online. 4-bit nibble lookup tables, byte spacing, and bitwise verification. Free.
Free Family Tree Creator & Diagram Maker
Build interactive multi-generation family trees and pedigree charts. Add member bios, photos, and kinship relationships. Export high-res PDF and SVG.
Whack-a-Mole Arcade Game
Build custom Whack-a-Mole arcade games online. Upload custom photo faces for targets, tune spawn speeds, power-up moles, and share encrypted challenge links.
Custom Spin the Wheel Builder
Create custom spinning wheels online with weighted slices, custom colors, sound effects, and auto-remove winners. Free classroom & raffle picker maker.
Catch the Ball Level Editor & Basket Studio
Design falling object catch challenges. Customize paddle bucket widths, gravity fall speeds, magnetic catch radius, and bomb hazard ratios. Free.
Custom Flappy Bird Level Designer & Character Studio
Create your own custom Flappy Bird game online. Upload custom face avatars, customize pipe obstacle gaps, tune wing lift & scrolling speed, and share links.
Custom Grow-a-Fish Game Builder
Design your own custom ocean feeding fish game. Customize sea water colors, player photo avatars, predator species tiers, and growth physics. Free.
🛡️ Encrypt & Secure
Text Encryption & Decryption Studio — AES-256 & Ciphers
Encrypt and decrypt text messages with military-grade AES-256 GCM encryption and classic ciphers online. 100% private browser-based cryptography. Free.
Cryptographic Hash Generator & File Verifier Studio
Generate and verify cryptographic hashes online: SHA-256, SHA-512, MD5, SHA-1, SHA3, and Keccak-256 for text and files. 100% Client-Side Privacy. Free.
SHA3-256 Hash Generator
Compute secure 256-bit SHA3 hashes based on the latest NIST Keccak standard. Advanced security for modern cryptographic integrity. Free and fast.
SHA-256 Hash Generator
Generate secure SHA-256 hashes instantly. industry-standard cryptographic hash tool for data integrity, checksums, and secure applications. Free and browser-based.
MD5 Hash Generator
Generate MD5 hashes instantly. Fast cryptographic hash tool for checksums and basic data verification. Free, secure, and browser-based.
CRC-32 Checksum Generator
Generate CRC-32 checksums instantly. Fast and reliable tool for error detection in data transmission and file integrity. Free and secure.
SHA-512 Hash Generator
Generate high-security SHA-512 hashes instantly. Professional cryptographic hash tool for maximum data protection and integrity. Free and secure.
SHA-1 Hash Generator
Generate SHA-1 hashes instantly. Secure browser-based tool for legacy system compatibility, Git commit references, and data integrity. Fast and easy.
SHA-384 Hash Generator
Compute high-security SHA-384 hashes instantly. SHA-2 family hashing for sensitive data integrity and modern cryptography. Free and private.
SHA3-384 Hash Generator
Generate secure SHA3-384 hashes based on the Keccak sponge construction. The latest NIST hashing standard for advanced security. Free and open.
SHA3-512 Hash Generator
Generate ultra-secure 512-bit SHA-3 hashes instantly. Based on the NIST-approved Keccak algorithm for the highest possible integrity protection.
Keccak-256 Hash Generator
Generate original Keccak-256 hashes instantly. Essential tool for Ethereum development, smart contracts, and blockchain verification. Free and precise.
SHAKE-128 XOF Generator
Generate SHAKE-128 extendable-output hashes (XOF) instantly. Part of the SHA-3 family allowing for customized hash lengths. Fast and secure.
SHAKE-256 XOF Generator
Generate high-security SHAKE-256 hashes instantly. 512-bit default XOF output for advanced cryptographic needs and modern data security.
CSS Box Shadow Generator
Design multi-layer CSS box shadows with Material Design elevation presets, Neumorphic soft glow, inset shadows, and Tailwind CSS copy. 100% Free.
JWT Decoder & Token Inspector Studio
Decode and inspect JSON Web Tokens (JWT) online. View Header, Payload claims, expiration timestamps (exp/iat), and cryptographic algorithms. 100% Private.
X.509 Certificate Decoder & SSL Inspector Studio
Decode and inspect X.509 SSL/TLS certificates (PEM / CRT / CER) online. View Subject, Issuer, Validity dates, SANs, Public Key, and fingerprints. 100% Private.
📝 Language & Text
Word Unscrambler & Anagram Solver Studio
Unscramble scrambled letters into valid words online. Filter by word length, starting/ending letters, and calculate official Scrabble & Words with Friends scores.
Text Formatting & Cleanup Studio
Manipulate text with our professional toolset. Transform case, find and replace, remove duplicates, and perform advanced string operations instantly in browser.
Word & Character Counter — Text Analytics Studio
Free online word counter and character counter. Analyze word count, character count with/without spaces, syllables, Flesch-Kincaid reading grade, and speaking time.
Professional Text Case Converter Studio
Convert text case online: UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, PascalCase, and Sentence case. 100% Free & Private.
🎨 Web & Design
Pixels to REM Converter — Responsive Typography & CSS Design Tokens
Convert pixels to REM units (px to rem) instantly with custom base font sizing. Perfect for responsive CSS stylesheets, Figma tokens, and accessibility.
QR Code Generator & Styling Studio
Generate custom QR codes online for URLs, Wi-Fi passwords, vCards, text, and email. Customize colors, add logos, and download in PNG or SVG. 100% Free.
Online QR Code Scanner & Barcode Reader Studio
Scan and decode QR codes and barcodes online using your webcam, smartphone camera, or by uploading image screenshots. 100% Free & Private.
Lorem Ipsum Generator Studio
Generate authentic Lorem Ipsum dummy placeholder text for UI/UX wireframes, web layouts, and typography testing. Paragraphs, sentences, and words.
🖼️ Image
Image Color Picker & Palette Extractor Studio
Extract exact pixel colors from images online. Magnified eyedropper loupe, HEX, RGB, HSL, CMYK codes, and automatic 6-color palette generation. 100% Private.
Secure Client-Side Image Resizer & Dimension Studio
Resize image dimensions online by exact pixels (width & height) or percentage. Lock aspect ratio, crop, and convert image formats. 100% Free & Private.
Secure Client-Side Image Compressor & Optimizer
Compress and reduce image file sizes online up to 90% without quality loss. Supports PNG, JPG, and WEBP with 100% private browser processing. Free.
Video to Image Frame Extractor Studio
Extract high-resolution image frames and screenshots from MP4, WebM, and MOV videos online. Frame-by-frame scrubbing and ZIP export. 100% Private.
Universal Image Converter & Batch Resizer
Convert images between PNG, JPG, WebP, GIF, BMP, ICO & SVG in bulk. 100% private client-side processing with quality sliders and custom resizing.
🌍 Popular Image Conversions
🧩 Regex
Password Complexity Regular Expression Studio
Create strong password complexity regular expressions using positive lookahead assertions. Configure length, case, digits, and special characters. Free.
Currency & Monetary Price Regex Studio
Generate and test currency regular expressions online. Supports USD ($), EUR (€), GBP (£), INR (₹), optional thousand commas, and decimal cent precision. Free.
Phone Number Telecom Regular Expression Studio
Generate and test phone number validation regular expressions. Supports ITU E.164 international notation, US NANP 10-digit formats, and regional dialing codes. Free.
Email Validation Regular Expression Studio
Generate regular expressions for email validation. Evaluate RFC 5322 specifications, HTML5 mailbox standards, plus-addressing, and custom domain restrictions. Free.
IP Address (IPv4 & IPv6) Regular Expression Studio
Generate and test IPv4 and IPv6 regular expressions online. Strict 0-255 octet range checking, CIDR subnet masks (/24), and compressed IPv6 notation. Free.
Username Handle & Real Name Regex Studio
Generate and test regular expressions for usernames, social handles, and real person names. Configure lengths, hyphens, underscores, and accents. Free.
URL & Domain Regular Expression Studio
Generate and test URL validation regular expressions online. Matches HTTP/HTTPS protocols, FQDN hostnames, ports, query strings, and anchor fragments. Free.
🛠️ Private, High-Performance Developer Utilities
Software engineers, DevOps teams, and web developers constantly handle sensitive payloads: JSON configuration trees, API tokens, Base64 encoded secrets, cron strings, and UUIDs. Pasting these strings into cloud-based converters exposes your proprietary data to server access logs and database breaches.
NexTools Developer Suite eliminates this vulnerability by executing 100% of formatting, parsing, encoding, and regex evaluations locally inside your browser's V8 engine. No network packets are sent to remote APIs while you work.
⚡ Core Toolkit Highlights
Our flagship developer tools include JSON Studio (syntax validation, tree formatting, minification, and conversion to YAML/CSV), UUID Generator (RFC 4122 v4/v1 batch creation), Base64 Studio (RFC 4648 encoding/decoding with UTF-8 support), Cron Expression Editor (human-readable schedule translation), and QR Code Generator (vector SVG export with custom error correction).
❓ Frequently Asked Questions — Developer Suite
QIs it safe to paste production API keys or JWT tokens into NexTools?
Is it safe to paste production API keys or JWT tokens into NexTools?
Yes. All parsing, decoding, and formatting are executed locally using client-side Web APIs and JavaScript in your browser sandbox. Inspect the browser Network tab (F12) to verify that zero external HTTP requests are made when processing data.
QDoes the JSON formatter handle massive files?
Does the JSON formatter handle massive files?
Yes. Because processing runs in memory on your local CPU without bandwidth throttling, our JSON and CSV engines can handle multi-megabyte payloads in milliseconds.
QAre generated UUIDs truly unique and RFC compliant?
Are generated UUIDs truly unique and RFC compliant?
Yes. Version 4 UUIDs are generated in strict compliance with RFC 4122 using crypto.getRandomValues, delivering 122 bits of cryptographic entropy with near-zero probability of collision.
QCan I use these tools offline?
Can I use these tools offline?
Yes. Once a tool page is loaded in your browser cache, you can disconnect from the internet or toggle airplane mode and continue using all formatters, encoders, and converters without interruption.