Development

Compress HTML by removing comments, collapsing whitespace and minifying inline CSS/JS

Format Conversion

Compress JSON data by removing all unnecessary whitespace

Sports

Compare a powerlifting total across four strength coefficient systems side by side: DOTS, Wilks (1994), IPF GL Points and Goodlift. Enter sex, body weight and three-lift total (squat + bench + deadlift) in kg or lb, and see each formula's points, coefficient, relative-strength tier and a progress bar showing how close the total is to each system's elite threshold. Complements the existing Wilks calculator by adding DOTS and IPF GL rather than replacing it.

Network

Dissect the HTTP/3 over QUIC handshake byte-by-byte. Visualise the 1-RTT fresh handshake, session-ticket resumption, and 0-RTT early-data scenarios, with sequence diagrams, per-packet field layouts, the Retry packet, and a side-by-side comparison against TCP + TLS 1.3. Built for interview prep, protocol learning, and performance engineering.

Text Processing

Deduplicate lines in a list or text block. Keep the first or last occurrence, with options for case sensitivity, whitespace trimming, and dropping empty lines.

Math & Numbers

Calculate Gibbs free energy ΔG = ΔH − TΔS, reaction spontaneity, equilibrium temperature, and equilibrium constant K.

Text Processing

Create a glitchy / corrupted look by replacing each letter with neighbouring broken Unicode glyphs — Cyrillic/Greek look-alikes, block elements (█▓▒░), geometric shapes — for a flat smashed data-corruption aesthetic. Intensity slider + optional seed for reproducible results.

Development

An interactive JSONPath REPL that runs multi-step query pipelines against any JSON. Write one JSONPath expression per line (e.g. $..book[?(@.price<10)] then $[0:5]) and see each step's matches with counts, paths, and values — plus a shareable URL that encodes your data and pipeline. Supports recursive descent ($..), wildcards ([*]), filters ([?(@.price<10)]), slices ([0:5:2]), and negative indices.

Security

Encrypt text with an RSA public key or decrypt ciphertext with the matching private key, using OAEP padding (SHA-1 or SHA-256). Handles long messages by chunking. Keys and data stay local. PKCS#1 v1.5 is intentionally not offered (Node disables it for decryption due to Bleichenbacher attacks).

Security

Generate an RSA key pair (2048/3072/4096-bit) as PEM-encoded public and private keys. Optionally encrypt the private key with a passphrase. PKCS#8 (recommended) or PKCS#1 private key format. Everything runs locally.

Design

Extract a dominant color palette from an image (k-means clustering), then export it as CSS variables, SCSS variables, a Tailwind config, or JSON design tokens — with named colors and an auto-generated shade scale for each

Validation

Validate 9-digit US ABA bank routing numbers (RTN) with MICR check-digit verification, Federal Reserve district lookup and ABA institution breakdown.