Developer Tools

Infinite streaming lorem ipsum with copy per paragraph.

Fake users, products, orders, employees, companies — JSON/CSV/SQL.

Download typed dummy files: PDF, PNG, JPEG, ZIP, CSV and more.

SVG placeholder images with 6 styles: solid, gradient, avatar…

Paginated REST API responses for users, products and orders.

Realistic nginx, apache, and syslog log lines.

Server-sent events (SSE) stream of realistic app events.

UUID, ULID, CUID, and NanoID — any count, copy or download.

MD5, SHA-1, SHA-256, SHA-512 — compute from any input.

Cryptographically random passwords with custom charset and length.

Aesthetically-pleasing palettes using golden-angle hue spacing.

Encode or decode Base64 strings instantly.

Convert Unix timestamps to ISO 8601, UTC, local, and relative.

Inspect JWT header, payload and expiry. Decoded client-side.

Encode or decode URL components (percent encoding).

Convert between camelCase, snake_case, PascalCase and more.

Convert between decimal, hexadecimal, binary, and octal.

Prettify, validate, and minify JSON with error highlighting.

Convert between JSON, CSV, and NDJSON formats.

Line-by-line diff viewer with +/− highlighting.

Test regular expressions with live match highlighting.

Live markdown editor with instant rendered preview.

Translate cron expressions to plain English with next run times.

Analyze strings: char count, bytes, entropy, Unicode code points.

Encode and decode HTML entities (<, &, ").

Convert colors between HEX, RGB, HSL, and HSB with harmonies.

Format numbers as currency, scientific, bytes, ordinals, and words.

Check password entropy, crack time, and strength score instantly.

Full ASCII reference: dec, hex, oct, binary, char. Searchable.

Parse IPv4/IPv6, CIDR subnet calculator, binary and hex representations.

Unix file permissions editor. Toggle bits, get octal, symbolic, command.

Convert text to binary, hex, octal, and decimal byte values.

Complete HTTP status code reference. Search, filter by category.

Convert px, rem, em, pt, vw, vh — configurable base font and viewport.

Parse UUIDs: detect version, extract v1 timestamp, show binary layout.

Calculate aspect ratios, resize proportionally, CSS snippets.

Sort, deduplicate, reverse, shuffle, and filter lines of text.

Parse URLs into components; edit query params; build URLs from parts.

Generate linear, radial, and conic CSS gradients visually with presets.

Generate SEO, Open Graph, and Twitter Card meta tags with live preview.

Convert between bytes, KB, MB, GB — SI vs binary (KiB, MiB) explained.

Build CSS box-shadow visually with layers, inset, glow, and presets.

Flesch, Gunning Fog, SMOG, grade level, reading time analysis.

Preview SVG code; encode as Base64 data URI, HTML img, CSS background.

Generate TypeScript interfaces from JSON. Handles nested objects and arrays.

See key, code, keyCode, and modifier states for any keypress.

Build CSS border-radius shapes visually — blobs, pills, organic shapes.

Date differences, add/subtract time, and format dates in multiple formats.

Convert cURL commands to JavaScript fetch API code. Supports headers, auth.

Interactive CSS flexbox visualizer with live preview and CSS output.

Interactive CSS Grid playground — columns, rows, gaps, areas, alignment.

Searchable Tailwind CSS class reference with live color swatches and examples.

30 random generators: names, emails, IPs, UUIDs, colors, lorem, and more.

Convert times between world timezones. Live clocks, 12/24h, all IANA zones.

WCAG 2.1 color contrast ratios. AA/AAA compliance for text and UI components.

Convert length, weight, temperature, volume, area, speed, pressure, and more.

Test JSONPath expressions on JSON data live. Wildcards, filters, recursive descent.

Focus timer with work/break sessions, audio alerts, and browser notifications.

Encode and decode Morse code with audio playback. Adjustable WPM and frequency.

View and edit CSV in an interactive table. Sort, filter, add rows/cols, export JSON.

Monthly payments, total interest, and full amortization schedule for any loan.

X% of Y, percentage change, discount, markup, fraction-to-percent, and more.

Scientific calculator with trig, log, and programmer mode (hex, binary, octal).

Exact age from birthdate — years/months/days, next birthday, total days, zodiac.

Convert between Roman numerals and integers with symbol breakdown and history.

Generate color palettes using color theory: complementary, triadic, analogous, more.

Pixels per inch, screen resolution, print size, and device pixel density calculator.

Primality test, factorization, prime sieve up to 100k, GCD and LCM calculator.

Browse 500+ emojis by category or search. Copy emoji, Unicode, HTML entity, CSS value.

Modular typography scale generator. Preview sizes, export CSS variables or Tailwind.

Build HTML tables visually. Edit cells inline, set headers, export HTML or Markdown.

Count down to any date. Multiple named timers, presets, share via URL.

Calculate tip and split the bill. Custom %, split by people, unequal split.

Roll D4–D100 and custom dice. D&D notation, history, statistics.

Precision stopwatch with lap splits. Fastest/slowest lap highlighted, copy laps.

Convert between YAML and JSON instantly. Auto-converts as you type, swap panels, copy.

Words, characters, sentences, reading time, keyword density, and more — live.

Test your WPM and accuracy. Time and word-count modes, live stats, difficulty levels.

Digital tally counter. Multiple named counters, keyboard shortcuts, CSV export.

White, pink, and brown noise for focus or sleep. Runs entirely in your browser.

Count LLM tokens for GPT-4, Claude, Llama, Gemini. Estimate cost and context window usage.

Convert images to Base64 data URIs. Drag & drop or paste. Outputs data URI, CSS, HTML, Markdown.

Convert HTML to JSX. Renames class→className, inline styles to objects, self-closes void elements.

Compare two JSON objects visually. See added, removed, and changed keys with full path display.

Convert text to URL slugs. Handles accents, separators, case options, bulk mode.

Format and beautify SQL queries. Uppercase keywords, indent subqueries, minify.

Bump major/minor/patch, compare versions, check range satisfaction, sort version lists.

Generate memorable passphrases using random words. Entropy score, crack time estimate.

Generate favicons from text or emoji. Preview at multiple sizes, download PNG, copy HTML tags.

Generate 10 tints and 10 shades from any color. Export as CSS variables, Tailwind config, or JSON.

Build cURL commands visually. URL, method, headers, body, auth, query params — live command output.

Transform text: reverse, pig latin, leetspeak, ROT13, morse, NATO, bubble text, fullwidth, zalgo, and more.

Convert numbers to English words. Cardinal, ordinal, currency, decimal modes. Up to quintillions.

Browse 40+ common regex patterns. Email, URL, IP, phone, UUID, password. Search, copy, and live test.

Generate Apache .htaccess rules. HTTPS redirect, security headers, caching, CORS, custom errors.

Convert numbers between binary, octal, decimal, and hexadecimal. BigInt precision, signed/unsigned interpretation.

Calculate SHA-1, SHA-256, SHA-384, SHA-512 of any file or text. Drag & drop — 100% in-browser, no upload.

Mix two colors with a ratio slider. See blends, tints, shades, and CSS values. Contrast ratio included.

Generate CSS resets: Modern, Normalize, Meyer, Minimal. Toggle sections, see live output, download as reset.css.

Resize images in your browser. Fit, fill, or stretch. Export as PNG, JPEG, or WebP. No uploads, no server.

Search Unicode characters by name or code point. See hex, HTML entity, CSS escape, UTF-8 bytes. Copy instantly.

Format, minify, and validate XML in your browser. Syntax error detection with line numbers. DOMParser-powered.

Calculate CSS selector specificity. Get (A,B,C) scores, compare multiple selectors, rank by cascade weight.

Descriptive stats for any number list: mean, median, mode, std dev, variance, percentiles, skewness, kurtosis.

Simulate protanopia, deuteranopia, tritanopia, achromatopsia. Test your palette for color vision accessibility.

Validate, format, and convert TOML. Convert TOML ↔ JSON. Pure browser-based, no libraries.

Generate Markdown tables from CSV or JSON. Parse Markdown tables back to CSV. Left/center/right column alignment.

Generate complementary, triadic, tetradic, analogous, and monochromatic palettes. Export as CSS/SCSS/JSON.

Generate JSON Schema (draft-07) from any JSON object. Infer types, required fields, and nested structures.

Encode/decode HTML entities. Browse 100+ named entities. Convert to named, decimal, or hex format.

Calculate password entropy and strength. Analyze char sets, estimate crack times, get improvement suggestions.

IPv4 subnet calculator. Enter IP/CIDR to get network address, broadcast, host range, usable count, binary view.

Parse, validate, and convert .env files. Export as JSON, shell export commands, or Docker --env-file format.

Browser-based drawing canvas. Freehand, shapes, eraser, fill. Undo history, color picker, download as PNG.

Validate, format, and inspect GeoJSON. Feature counts, geometry types, bounding box, ASCII map preview.

Build Content Security Policy headers visually. Configure directives, copy for nginx/Apache/meta tags.

100+ Git commands with descriptions. Search by keyword or category. Copy any command instantly.

Preview system and Google Fonts. Adjust size, weight, spacing, and line height. Copy CSS snippet.

Detect screen resolution, viewport, device pixel ratio, color depth, and responsive breakpoints live.

Generate customizable lorem ipsum text. Choose words, sentences, or paragraphs. Plain text, HTML, or Markdown output.

Build CSS keyframe animations visually. 8 presets, live preview, copy ready-to-use CSS.

120+ Linux/bash commands with examples. Search by name or description. Copy any command instantly.

Convert JSON arrays to HTML, Markdown, or CSV tables. Sortable columns, live preview.

Complete Markdown syntax reference with live preview. Headings, lists, code, tables, links, and more.

100+ Vim keybindings organized by mode. Normal, Insert, Visual, Command. Search and copy any binding.

Write and test SQL queries in-browser. Sample tables, schema viewer, results table — no server needed.

80+ HTTP headers with descriptions and examples. Request, response, security, CORS, caching. Searchable.

Build and manage CSS custom properties. Design tokens editor, export as CSS, SCSS, or JSON.

Generate SVG placeholder images in-browser. Custom size, color, text, pattern. Copy URL, data URI, or download.

Test HTTP APIs from your browser. Set method, headers, body. See status, response time, and formatted JSON.

Evaluate JSONPath expressions on any JSON. Live results, filter support, syntax reference.

Advanced color picker with HEX, RGB, HSL, HSB, CMYK. History, palette, WCAG contrast checker.

Generate webpack.config.js visually. Choose loaders, plugins, devServer. Copy config + install command.

Common ports reference, CIDR calculator, IP class info, MAC address lookup — all in-browser.

100+ Docker commands for containers, images, volumes, networks, compose. Search, filter, copy.

Shortcuts for VS Code, Chrome DevTools, macOS, Windows, tmux, Vim, Git, and more. Searchable.

Decode JWTs, inspect claims, expiry, scopes. Build OAuth 2.0 authorization URLs with PKCE.

Word count, readability scores, character frequency, keyword density, reading time — all live.

Generate nginx configs visually. Static site, reverse proxy, SSL, CORS, gzip, security headers.

Strip TypeScript type annotations to plain JavaScript. Removes interfaces, generics, casts, access modifiers.