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