Free browser-based utilities that streamline coding tasks with instant text processing, data conversion, and validation capabilities.
vCard Contact File Generator Build a properly formatted .vcf contact file (vCard 3.0 or 4.0) that phones, address books, and email clients accept on first import. Fill in the fields, watch the raw vCard update live, then download the file or copy the text. Everything runs in your browser — no contact data leaves the ...
Try the Tool »Solidity Code Formatter Paste your Solidity smart contract source and get back clean, style-guide-compliant code in the browser — no installs, no Hardhat config, no remote compilation. The formatter reorders function modifiers, sorts pragmas and imports, normalises NatSpec comments, and applies consistent indentation so the output is ready for review or audit hand-off. How to ...
Try the Tool »Battery Life / Runtime Calculator Estimate how long a battery will power a device from its capacity, voltage and load. The calculator handles mAh, Ah and Wh inputs, series/parallel cell arrangements, depth-of-discharge limits, system efficiency and the Peukert exponent for lead-acid chemistries. Output includes pack totals and time remaining at 100%, 80%, 50% and 20% ...
Try the Tool »cURL to Code Converter Paste a curl command and instantly get the equivalent HTTP-client code in Python, JavaScript, PHP, Go, or Ruby. The converter runs entirely in your browser, parses curl with a real shell-aware tokenizer, and maps the flags you actually use — headers, JSON and form bodies, multipart uploads, basic auth, cookies, redirects, ...
Try the Tool »Bicycle Gear Ratio & Speed Calculator See exactly how fast you will roll in every gear on your bike. Punch in your chainring and cassette teeth, pick a wheel size, and the calculator builds a colour-coded grid of speed, gear inches, development and ratio for every chainring × sprocket combination — useful when shopping for ...
Try the Tool »Braille Text Generator Convert any text into Grade 1 (uncontracted) English Braille using the official Unicode Braille block. The tool renders each character as a large 2×3 dot cell so you can see exactly which dots are raised, plus a per-character map showing the source letter alongside its Braille glyph. Useful for accessibility prototyping, classroom ...
Try the Tool »Camera Depth of Field (DoF) Calculator Plan sharp photographs with confidence. This calculator uses the exact thin-lens depth of field formulas to compute the hyperfocal distance, the near and far focus limits, and the total depth of field for any camera sensor, focal length, aperture, and subject distance. No guesswork, no approximations — just the ...
Try the Tool »SVG Noise & Texture Generator Create organic grainy noise and turbulent cloud textures directly in your browser using the SVG feTurbulence filter. Drag the sliders, tweak the seed, pick a tint color, and watch the texture update live. Export as inline SVG, a CSS background-image data URI, or a reusable SVG filter you can apply ...
Try the Tool »Text Column Aligner The Text Column Aligner pads spaces between text so a chosen delimiter — an equals sign, colon, comment marker, arrow, pipe, tab, or any custom string — lines up vertically across every row. It turns ragged key/value blocks, config snippets, and inline comments into clean visual columns without rewriting the content itself, ...
Try the Tool »Paper Size Reference & Converter Look up any standard paper size across the ISO, ANSI, and JIS systems and see its dimensions in millimeters, centimeters, inches, points, picas, and pixels at any common print or screen DPI. Switch to custom mode to enter your own width and height in mm, cm, inches, points, or pixels ...
Try the Tool »Big Integer Calculator Compute exact results for math expressions that overflow ordinary calculators. The tool runs entirely on JavaScript BigInt, so factorial(1000), 25000, fibonacci(10000), and primality checks on trillion-digit candidates return every digit correctly — no scientific notation, no silent rounding. How to Use Type an integer expression, for example 2 ** 1000, factorial(100), or ...
Try the Tool »Shell Glob Pattern Tester Test glob patterns against a list of file paths and see exactly which paths match — in real time, with semantics for Bash, Zsh, .gitignore, Python fnmatch, and Go path.Match. Type a pattern like src/**/*.{js,ts}, paste paths, and watch matches highlight green and non-matches fade out as you type. How to ...
Try the Tool »CSV Pivot Table Generator Turn flat CSV data into an interactive pivot table in seconds. Drag column headers into the Rows, Columns, Values, and Filters zones and watch the cross-tabulation recompute live — no spreadsheet, no formulas, no upload to a server. Perfect for slicing exported reports, analytics dumps, or any tabular dataset right in ...
Try the Tool »Merkle Tree Generator & Visualizer Paste a list of values, choose a hash function, and instantly see a visual Merkle tree with every intermediate node hash and the final Merkle root. Pick SHA-256, SHA-1, or Keccak-256 (the hash Ethereum uses), tune the Bitcoin-style odd-leaf rule or the OpenZeppelin sorted-pair convention, and export the full tree ...
Try the Tool »GPU VRAM Calculator Estimate how much GPU memory a transformer model needs for inference or training. Enter parameters, precision, batch size, and sequence length, and the calculator returns total VRAM along with a breakdown of weights, gradients, optimizer state, KV cache, and activations. It also compares the result against common GPUs (RTX 4090, A100, H100, ...
Try the Tool »Julia Code Formatter Paste any Julia (.jl) source and get instantly reformatted output following the conventions used by the wider Julia scientific-computing community. The tool runs entirely in your browser — no Julia runtime, no server round-trip — so even confidential research or proprietary code can be cleaned up safely. The formatter mirrors the default ...
Try the Tool »Number Notation Converter Paste a number in any common notation and instantly see how it looks in every other one. Useful when you copy a figure out of a German invoice into a US spreadsheet, when an Indian accountant hands you a balance in lakhs, or when a paper expresses something in scientific notation that ...
Try the Tool »ASCII Box Table Generator Paste CSV or tab-separated data and instantly turn it into a clean, fixed-width table built from Unicode box-drawing characters. The generator auto-sizes each column to fit the widest cell, so borders always line up no matter how irregular the source data is. Drop the result straight into READMEs, code comments, terminal ...
Try the Tool »Leet Speak (1337) Text Converter Convert any plain text to leet speak (also known as 1337 or hackspeak) in your browser, with three intensity levels and a reverse decoder. The tool swaps letters for numbers and symbols using deterministic lookup tables, so the same input always produces the same output unless you opt in to ...
Try the Tool »Anagram Generator Type any word or short phrase and instantly see every valid English anagram it can form. The generator runs entirely in your browser against a curated dictionary of common English words, so there are no API calls, no rate limits, and no data leaves your device. It supports single-word lookups, two-word and three-word ...
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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 3, 2026
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