ToolsHub
Free, client-side developer & productivity tools. Nothing you type leaves your browser.
Generators (16)
Password Generator
Generate strong, random passwords with custom length and character sets.
UUID Generator
Generate v4 UUIDs / GUIDs in bulk, with multiple formatting options.
Random Number Generator
Generate random integers or decimals within a custom range.
QR Code Generator
Generate downloadable QR codes for text, URLs, and more.
Barcode Generator
Generate downloadable barcodes in CODE128, EAN, UPC, and more formats.
Countdown Timer
A circular countdown timer with presets, pause/resume, and completion alert.
Email Signature Generator
Design a professional HTML email signature and copy the source.
Signature Generator
Draw or type a signature and download it as a transparent-ready PNG.
CSS Gradient Generator
Build linear, radial, and conic CSS gradients with a live preview and copyable code.
CSS Box Shadow Generator
Design multi-layer box shadows and rounded corners with a live preview and copyable CSS.
Placeholder Image Generator
Generate placeholder images locally with custom size, colors, and text - no network request.
Lorem Ipsum Generator
Generate classic Lorem Ipsum placeholder text by paragraphs, sentences, or words.
Fake Data Generator
Compose a field schema and generate realistic mock data (English or Vietnamese) as JSON/CSV.
CSS Animation Generator
Build CSS @keyframes animations visually with a live preview and copyable code.
Avatar Generator
Generate a deterministic geometric avatar (identicon) from any seed text, exportable as PNG or SVG.
Fake Credit Card Generator
Generate Luhn-valid test credit card numbers for Visa, Mastercard, and Amex - for testing only.
Converters (16)
Morse Code Translator
Translate text to Morse code and back, with audio playback.
Color Converter
Convert colors between HEX, RGB, HSL, and CMYK formats.
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Unit Converter
Convert between length, weight, temperature, and volume units.
Aspect Ratio Calculator
Calculate aspect ratios and scale dimensions proportionally.
Color Picker from Image
Pick colors from any uploaded image and get HEX, RGB, and HSL values.
Currency Converter
Convert between world currencies using live exchange rates.
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal, and any custom base 2-36 live.
World Clock
See live local time across major world cities, or plan a meeting by sliding one reference moment across all of them.
Roman Numeral Converter
Convert between Arabic numerals (1-3999) and Roman numerals in both directions, live.
YAML ⇄ JSON Converter
Convert between YAML and JSON in either direction with clear parse-error messages.
CSS Unit Converter
Convert between px, rem, em, pt, and % with a configurable base font size.
Data Storage Unit Converter
Convert between bytes, KB, MB, GB, and TB - with a clear binary (1024) vs decimal (1000) toggle.
Text to Binary/Hex Converter
Convert text to and from ASCII binary, decimal, and hexadecimal representations.
PDF Toolkit
Merge multiple PDFs, split pages out of a PDF, or combine images into a PDF — all in your browser.
Extract Audio from Video
Pull the audio track out of a video file as MP3, WAV, or AAC - entirely in your browser.
Encoding & Security (10)
Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of any text.
Base64 Text Encoder/Decoder
Encode or decode text to and from Base64.
URL Encoder/Decoder
Encode or decode URL components and query strings.
Zero-Width Text Hider
Hide text inside other text using invisible zero-width Unicode characters.
Base64 Image Encoder/Decoder
Convert images to Base64 data URLs and back.
JWT Decoder
Decode and inspect JSON Web Tokens, with expiry status and HMAC signature verification.
htpasswd Generator
Generate .htpasswd lines for HTTP Basic Auth using bcrypt or legacy SHA-1 hashing, entirely in the browser.
Password Strength Checker
Check how strong a password is with entropy estimation, crack-time, and common-pattern detection.
HTML Entity Encoder/Decoder
Encode or decode HTML entities like &, <, and .
SSL Certificate Decoder
Decode a PEM certificate to inspect its subject, issuer, validity dates, and SANs.
Image (12)
Image Compressor
Compress images client-side with adjustable quality and format.
Image Resizer
Resize images to exact dimensions with optional aspect-ratio lock.
Image Cropper
Crop images to a custom region with a draggable selection box.
Image Enhance
Adjust brightness, contrast, saturation, and blur, then export.
Image Metadata Viewer
View file and pixel metadata (dimensions, size, type) for any image.
Favicon Generator
Generate a full favicon set (16-512px + apple-touch-icon) with manifest and HTML snippet from one image.
SVG Optimizer
Clean up SVG markup client-side: strip comments/cruft, collapse whitespace, and round numeric precision.
Image Watermark Tool
Add a text or logo watermark to an image with adjustable position, opacity, and tiling.
Image Color Palette Extractor
Extract the dominant color palette from any uploaded image.
Image Format Converter
Convert images between PNG, JPEG, and WebP directly in your browser.
QR Code Reader
Scan a QR code from an uploaded image or your camera and decode its content.
Remove Image Background
Automatically remove an image's background with AI, then touch up edges and swap in a new background - all in your browser.
Dev Utilities (20)
JSON Formatter & Validator
Format, minify, and validate JSON with syntax error detection.
Regex Tester
Test regular expressions against sample text with live match highlighting.
Nginx Config Generator
Generate an Nginx server block with PHP-FPM, SSL, gzip, and caching options.
Git Command Reference
Searchable reference of common Git commands, organized by category.
.gitignore Generator
Generate a .gitignore file for your stack from common language/tool templates.
Diff Checker
Compare two blocks of text line-by-line with an LCS-based diff and inline add/remove highlighting.
Cron Expression Parser
Explain standard 5-field cron expressions in plain English and preview upcoming run times, or build one from a form.
CSV ⇄ JSON Converter
Convert between CSV and JSON with a hand-written RFC 4180-aware parser, configurable delimiter, and copy/download for both sides.
HTTP Status Code Reference
Searchable, color-coded reference of HTTP status codes across 1xx-5xx with plain-English explanations.
User-Agent Parser
Parse a User-Agent string into browser, OS, device, and engine details using regex heuristics.
.env File Validator
Validate .env file syntax (duplicate keys, invalid names, unquoted spaces) and optionally sort keys or mask values for safe sharing.
CSS/JS Minifier
Strip comments and collapse whitespace in CSS or JavaScript without touching string, regex, or template-literal content.
SQL Formatter
Format and beautify SQL queries with proper indentation and keyword casing.
cURL to Code Converter
Paste a curl command and get equivalent fetch, axios, or XMLHttpRequest code.
JSON Diff Checker
Compare two JSON objects structurally, ignoring formatting and key order.
Docker Config Generator
Generate a docker-compose.yml or Dockerfile for common stacks (Node, Python, PHP, Postgres, Redis, and more).
IP Address Checker
Look up your public IP address and its geolocation, ISP, and ASN details - or look up any other IP address.
DNS Lookup
Query A, AAAA, MX, TXT, NS, and CNAME records for any domain.
SSL Certificate Checker
Check a live domain's SSL/TLS certificate — issuer, validity dates, and days until expiry.
Whois Lookup
Look up domain registration details — registrar, creation date, expiry date, and name servers.
Text (6)
Text Utilities
Case conversion, word/character counting, and text transformations.
Markdown Converter
Preview Markdown rendered to HTML in real time.
Word Cloud Generator
Turn any block of text into a visual word cloud sized by word frequency.
Text to Speech & Transcribe
Read text aloud or transcribe speech to text, entirely via your browser's built-in speech engine.
Text Encryptor (AES)
Encrypt and decrypt text with a passphrase using AES-GCM via the browser's Web Crypto API.
Emoji Picker
Search emoji by name or keyword and copy them with one click.
SEO (8)
Meta Tag Generator
Generate SEO, Open Graph, and Twitter Card meta tags for any page.
Keyword Density Checker
Analyze keyword and phrase frequency/density in your content.
robots.txt Generator
Build a robots.txt with per-bot rules, crawl delay, and sitemap reference.
Sitemap Generator
Build, bulk-import, and validate sitemap.xml files with lastmod, changefreq, and priority.
Slug Generator
Turn any title into a clean, URL-safe slug with correct Vietnamese diacritic handling.
Social Share Preview
Preview how a link will look when shared on Facebook, Twitter/X, LinkedIn, and Discord.
Google SERP Snippet Preview
Preview how a title and description will look in Google search results, with pixel-accurate truncation.
Schema.org / JSON-LD Generator
Build structured data (Article, Product, FAQ, Breadcrumb, and more) as copyable JSON-LD.