Free browser-based utilities that streamline coding tasks with instant text processing, data conversion, and validation capabilities.
SWIFT/BIC Code Validator & Parser Paste any SWIFT or BIC code to validate its structure against the ISO 9362 specification and break it into its component parts. The tool checks character patterns, length, and identifies whether the code refers to a head office or a specific branch — all client-side, with no data ever leaving ...
Try the Tool »Directory / Folder Tree Generator Turn a plain indented file list or a set of slash-separated paths into a clean ASCII directory tree with proper box-drawing characters. Perfect for READMEs, technical documentation, blog posts, and code reviews where a visual project structure communicates more than a flat list of file paths. How to Use Paste ...
Try the Tool »Playfair Cipher Encoder & Decoder Encrypt or decrypt text with the classic Playfair cipher entirely in your browser. Enter a keyword, paste your plaintext or ciphertext, and watch the tool build the 5×5 keyed matrix, prepare the digraphs, and walk through every substitution step. No data ever leaves your device. How to Use Pick a ...
Try the Tool »Ethereum / EVM Address Checksum Validator Paste any Ethereum or EVM-compatible address and instantly check whether its mixed-case checksum is correct under EIP-55. The tool also returns the canonical checksummed form so you can copy a safe version back into your wallet, contract, or block explorer. Everything runs locally in your browser — no addresses ...
Try the Tool »Hardness Scale Converter Convert a single hardness measurement across the Mohs, Vickers (HV), Brinell (HB), and Rockwell A / B / C scales in one click. The converter uses ASTM E140 lookup data (with linear interpolation between rows) for the steel scales, plus a log-linear fit between Mohs and Vickers so you can compare metals ...
Try the Tool »Heat Index & Wind Chill Calculator Find out what the weather really feels like. This calculator combines temperature with humidity (for hot days) or wind speed (for cold days) to produce a “feels like” temperature using the official NOAA / National Weather Service formulas, then maps the result to a color-coded safety category so you ...
Try the Tool »Print & Typography Units Converter A live, bi-directional converter for the units designers, print professionals and front-end developers reach for every day: points, picas, pixels, millimetres, centimetres, inches, em and rem. Type into any unit and the rest update instantly using the DPI and font size you choose, so values match the actual medium you ...
Try the Tool »Multi-Base Arithmetic Calculator (Hex / Binary / Octal) Add, subtract, multiply, divide, and take the modulo of numbers written in binary, octal, decimal, or hexadecimal — and see the answer in all four bases at once. The calculator uses arbitrary-precision BigInt arithmetic, so large hexadecimal values stay exact, and it visualises the carry, borrow, shift-and-add, ...
Try the Tool »Lua Code Formatter Paste your Lua code and get a cleanly indented, evenly spaced version in one click. The formatter understands Lua block structure (if/then/end, do/end, function/end, repeat/until) and normalizes operator spacing without sending your code anywhere — everything runs in your browser, so it works for proprietary game scripts, embedded device firmware, and config ...
Try the Tool »ANSI Terminal Color Code Generator Build ANSI escape sequences (Select Graphic Rendition codes) for coloring and styling terminal output. Pick a foreground and background color, toggle styles like bold or underline, and get a ready-to-paste escape string plus a live preview of how it renders in a terminal. How to Use Type the sample text ...
Try the Tool »Musical Interval Converter Convert any musical interval between three universal units — semitones, cents, and frequency ratios — and instantly see the matching interval name (minor 3rd, tritone, perfect 5th, octave, and beyond). The tool is built for music theory students, instrument builders, audio engineers, and electronic-music producers who work with pitch in precise units ...
Try the Tool »Jsonnet Formatter & Evaluator Paste Jsonnet source and get a fully evaluated JSON result, or pretty-print the source itself. This tool runs entirely in your browser, so your configuration never leaves the page. Handy for previewing Kubernetes manifests, Grafana dashboards, Tanka environments, or any other config-as-code expressed in Jsonnet. How to Use Paste Jsonnet code ...
Try the Tool »HJSON Formatter & Validator Paste HJSON — the human-friendly variant of JSON that allows comments, unquoted keys and strings, multiline values, and trailing commas — and convert it to strict JSON instantly. The tool also runs the conversion in reverse: drop in strict JSON and get a cleaner HJSON version with unquoted keys for easier ...
Try the Tool »Color Swatch Sheet Generator Paste a list of colors and instantly preview them as a printable swatch sheet with hex labels. Mix any CSS color format you like — short and long hex, rgb(), rgba(), hsl(), hsla(), or named colors such as tomato — then download the sheet as a high resolution PNG or scalable ...
Try the Tool »Elixir Code Formatter Paste your Elixir source code and get clean, mix format-style output instantly in your browser. Standardize indentation, normalize spacing around operators, sort alias / import / require / use blocks, and surface syntax problems before they reach iex. Everything runs client-side, so your code never leaves your machine. How to Use Paste ...
Try the Tool »Irregular Polygon Area Calculator Type a list of vertex coordinates and instantly get the area, perimeter, and centroid of any flat polygon — convex or concave, axis-aligned or skewed, three vertices or thirty. The calculator uses the classic Shoelace formula so the answer is exact (no triangulation, no approximations), and it draws a live SVG ...
Try the Tool »Unified Color Space Converter Paste a color in any common format and instantly see it represented across nine color spaces side by side. The converter auto-detects HEX, RGB, HSL, HSV/HSB, CMYK, CIE LAB, LCH, CIE XYZ, Oklab, and CSS named colors, then computes every other representation using full sRGB gamma correction and the standard D65 ...
Try the Tool »XML Diff Comparator Compare two XML documents at the node level or the line level. The XML Diff Comparator highlights added, removed, modified, and attribute-level changes so you can spot exactly what changed without skimming through thousands of tags by eye. Unlike plain text diff tools, this comparator understands XML structure: it ignores cosmetic whitespace, ...
Try the Tool »NPV & IRR Calculator Evaluate an investment opportunity the way finance professionals do. This calculator turns a stream of yearly cash flows into the four numbers that matter most for any capital-budgeting decision: Net Present Value (NPV), Internal Rate of Return (IRR), Modified IRR (MIRR), and the Profitability Index. It also reports the simple and ...
Try the Tool »CSS Custom Property Extractor Paste any CSS or SCSS stylesheet and instantly get a clean, sorted, deduplicated list of every --custom-property declared in it — along with the selector scope it was declared in. The extractor also surfaces variables that are referenced via var(--name) but never declared anywhere, which are a common cause of broken ...
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Scoreboard is a fun way to keep track of your games, all data is stored in your browser. More features are coming soon!
Update: Our latest tool was added on Jun 14, 2026
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