Free Tools

Beautify, minify and validate JSON instantly. Catches syntax errors with line and position. Runs entirely in your browser.

• Beautify with 2-space indent
• Minify for production
• Inline syntax validation
• Zero uploads

Inspect JSON Web Tokens — decode header, payload, and claims with expiry detection. Decoding only, never sent to a server.

• Decode header + payload
• Expiry & nbf detection
• Readable timestamps
• Browser-only

Encode and decode Base64, Base64URL, and URL-encoded text instantly. Edit either side and watch the other update.

• Base64 + Base64URL
• URL encoding
• Two-way live conversion
• Unicode safe

Convert Unix timestamps to readable dates and back. Seconds, milliseconds, ISO 8601, UTC and local time.

• Live current Unix time
• Seconds + milliseconds
• ISO 8601 + UTC + local
• Relative time

Generate cryptographically random UUIDv4 in bulk, or validate any UUID against RFC 4122.

• UUIDv4 (cryptorandom)
• Bulk generate (1–50)
• RFC 4122 validation
• Version + variant

Paste any code snippet and get a plain-English summary, step-by-step walkthrough, and likely bugs or improvements.

• Any language
• Step-by-step
• Bug & smell hints
• Nothing stored

Describe a pattern in plain English. Get a working regex with flags, an explanation, and matching/non-matching examples.

• Plain-English in
• JavaScript flavor
• Examples included
• Nothing stored

Describe what you want from your database. Get clean SQL with explanation and assumptions, in the dialect you choose.

• Postgres, MySQL & more
• Schema-aware
• Self-explaining
• Nothing stored

Build a custom schema and generate realistic fake data — names, emails, addresses, dates, prices and more. Export as JSON, CSV or SQL.

• Custom schema
• JSON · CSV · SQL
• Seeded reproducibility
• Runs in your browser

Everything you need to debug, manage, and assess your domains, APIs, SSL, DNS records and more — all in one place.

• DNS Lookup
• IP lookup
• SSL Certificate Info
• WHOIS Lookup
• HTTP Header Analyzer

Lightweight REST client in your browser. Build requests, add headers, view responses, and copy as cURL. Postman alternative.

• All HTTP methods
• Custom headers + body
• Response timing + status
• Copy as cURL

Paste a cURL command and instantly get equivalent code in JavaScript, Node.js, Python, PHP, and Go.

• JS fetch + axios
• Python requests
• PHP cURL + Go
• Live conversion

Generate realistic mock JSON with custom fields and a matching JSON Schema. Perfect for prototyping APIs and UIs.

• 20+ field types
• Up to 500 records
• Matching JSON Schema
• Download or copy

Run GraphQL queries with variables and headers, and introspect any GraphQL schema. GraphiQL-style, in your browser.

• Query + variables
• Custom headers
• Schema introspection
• JSON response viewer

See your public IP, ISP, geolocation and every HTTP header your browser actually sends. Useful for debugging APIs, VPNs, and fingerprinting.

• Public IP detection
• Geolocation + ISP
• All request headers
• Refresh on VPN switch

Generate stunning, accessible color schemes in hexcode for Tailwind CSS, compatible with websites, products, UI/UX or social posts/emails.

• Accessibility grade
• Multi-color themes
• Multiple formats
• Dark mode sets
• Contrast preview

Visually craft box-shadows, border-radius, gradients, glassmorphism and neumorphism with live previews. Copy production-ready CSS in one click.

• Box shadow + radius
• Linear / radial / conic gradients
• Glassmorphism + Neumorphism
• Live preview

Visually compose Tailwind utilities — layout, spacing, color, typography and effects — and copy ready-to-paste classes or JSX.

• Every utility group
• Live preview
• Copy as classes or JSX
• v3 compatible

Shrink SVG files in your browser and export as React JSX, base64 data URI, or CSS background image.

• Live byte-savings
• Strip metadata + IDs
• React JSX export
• Data URI + CSS

Turn any image or emoji into a complete favicon set — every size, multi-size .ico, Apple touch icon and HTML.

• From image or emoji
• 9 sizes + multi-size .ico
• Apple touch + PWA
• Copy-paste HTML

All-in-one SEO analysis and audit suite that takes 30 seconds. Page, keyword, mobile-friendly, search metrics, and competitor research — for free.

• On-Page SEO Analyzer
• Meta tag analyzer
• Core Web Vitals report

Single-URL deep dive into LCP, CLS, INP and more — real Lighthouse data on mobile and desktop.

• LCP, CLS, INP, FCP, TBT
• Mobile + desktop
• Top opportunities
• Real Lighthouse data

All four Lighthouse scores plus ranked optimization opportunities for any URL.

• Performance + A11y + SEO + Best Practices
• Ranked opportunities
• Mobile + desktop
• Real Lighthouse data

Compress and convert images to WebP, AVIF, JPEG or PNG. Resize and batch process — all in your browser.

• WebP + AVIF + JPEG + PNG
• Quality + resize
• Batch processing
• Up to 80% smaller

Beautify or minify JavaScript, CSS, HTML and JSON — powered by Prettier and Terser, in your browser.

• Prettier beautify
• Terser minify
• JS, CSS, HTML, JSON
• Live byte-savings

Upload a JS bundle and see raw, minified, gzip and brotli sizes — plus the top modules eating your budget.

• Real gzip + brotli sizes
• Top modules detected
• Smart warnings
• Composition breakdown

Describe your page in a sentence. Get a complete SEO bundle — title, description, slug, H1, social tags and JSON-LD.

• SERP-safe limits
• OG & Twitter tags
• JSON-LD included
• Nothing stored

Secure, memorable passwords following NIST guidelines. Choose length, symbols, characters — or generate strong multi-word passphrases. Runs entirely in your browser.

• Cryptographically secure
• Customizable options
• Passphrase mode
• Zero logging

Share passwords, logins or texts, end-to-end encrypted, on one-time links that disappear after reading. No traces, no data.

• End-to-end encrypted
• Zero logs
• Open and destroy
• Auto-expiration

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512, and bcrypt hashes — and verify bcrypt — in your browser.

• MD5, SHA-1/256/384/512
• bcrypt with cost factor
• Verify bcrypt hashes
• Zero uploads

Find out how strong your password really is — powered by zxcvbn. Entropy, crack-time estimates and improvement tips, all in your browser.

• zxcvbn-powered score
• Real crack-time estimate
• Entropy in bits
• Plain-English tips

Decode JSON Web Tokens and verify HS256/HS384/HS512 signatures with your secret. Inspects claims, expiry, and headers.

• Decode header + payload
• Verify HMAC signatures
• Expiry & nbf detection
• Browser-only

Sign messages with HMAC-SHA1/256/384/512 — perfect for verifying webhook signatures from Stripe, GitHub, and Slack.

• SHA-1/256/384/512
• Text, hex or base64 keys
• Hex + Base64 + Base64URL
• WebCrypto local

Check any domain's SSL certificate — issuer, expiry, TLS version and a quick A–F health grade. Simple SSL Labs alternative.

• A–F health grade
• Days until expiration
• Issuer + SAN entries
• TLS protocol + cipher

Test JavaScript regular expressions in real time with live highlighting, every flag, and capture-group inspection.

• Live match highlighting
• All flags (g, i, m, s, u)
• Capture group details
• Browser-only

Decode and build cron schedules with plain-English explanations and the next 5 run times — like crontab.guru, in your browser.

• Plain-English decoding
• Next 5 run times
• Common presets
• Live validation

Parse, validate and reformat .env files. Catches invalid keys, duplicates, unquoted values, and risky secrets — all in your browser.

• dotenv-compatible parser
• Auto-quotes values
• Catches duplicates
• Never uploaded

Catch Dockerfile mistakes before they ship — pinned tags, COPY vs ADD, layer caches, root users and more. Hadolint-inspired.

• Hadolint-style rules
• Severity-tagged findings
• Best-practice checks
• Browser-only

Live GitHub-flavored Markdown editor with safe HTML output, copy and download. Sanitized via DOMPurify.

• GitHub-flavored Markdown
• Live preview
• XSS-safe HTML output
• Copy or download

Compare text, code or JSON — line, word, or structural — with unified and side-by-side views. Browser-only.

• Line, word, JSON modes
• Unified + split view
• JSON key-order safe
• Zero uploads

Shorten long URLs quickly with vanity links to a clean, fast, unique site with trackable QR codes. Fast and easy.

• Shorten any URL
• Auto generate short link
• View click data
• Track stats

Analyze views, discover hidden tags, see channel stats and boost your YouTube, drive your business, and supercharge your growth.

• Video performance trends
• Tag analysis + discovery
• Channel competitor stats
• Trend analysis

Optimize your Kindle books, edit metadata, check titles, descriptions, keywords and more using A+ sales boosting tools.

• KDP search/metadata result
• Title + descriptor analysis
• Category stats and suggestions

World clock, stopwatch, countdown timer and alarm — all in one clean, distraction-free page that works in any browser.

• World clock
• Stopwatch + timer
• Alarms
• Runs anywhere

Fast in-browser calculator for everyday math — keyboard friendly, with history and standard plus scientific modes.

• Standard + scientific
• Keyboard friendly
• Calculation history
• Zero install