KeyboardWarrior.co.uk
Privacy-first utilities for developers, sysadmins, and operators — format, convert, calculate, and play without sending tool data to a server.
Dev & Code
Formatters, codecs, diffs, and transformers that never leave your browser.
JSON / YAML / TOML Converter
Bidirectional conversion with validation, formatting, and tree view.
Regex Tester & Explainer
Real-time matching, highlight groups, breakdown, and cheat sheet.
Base64 / URL / JWT Codec
Encode and decode Base64, URLs, and JWTs entirely in your browser.
Diff Checker
Side-by-side and unified diffs for text, code, and JSON.
String Case Transformer
Live camelCase, PascalCase, snake_case, kebab-case, and more.
cURL to Code Converter
Paste a curl command and get fetch, axios, Python, Go, or Node.
Networking & IT
Subnet math, chmod modes, and cron schedules for sysadmins on the go.
Generators
IDs, key events, ASCII banners, and Git recovery without the panic.
Key Event & KeyCode Tester
Inspect event.key, code, keyCode, location, and modifiers live.
UUID / ULID / NanoID Generator
Bulk IDs with Spacebar regenerate. Fully client-side.
ASCII Banner Generator
Turn plain text into terminal-ready FIGlet-style banners.
Git "Emergency" Decision Tree
Scenario-based recovery commands for common Git disasters.
Accounting
VAT, contractor rates, depreciation, bank checks, and ledger reconcile — still 100% local.
VAT / Sales Tax Calculator
Add or extract VAT at UK and custom rates. Net, tax, and gross in one pass.
Contractor Rate Calculator
Day rate ↔ hourly, weekly/monthly estimates, and simple UK take-home sketches.
Depreciation Calculator
Straight-line and declining-balance schedules — fully client-side.
IBAN & Sort Code Validator
Validate IBANs (mod-97) and UK sort code / account number formats locally.
Invoice & Payment Ref Generator
Bulk invoice numbers and payment references with custom prefixes.
Ledger Reconcile
Paste two amount lists or CSV columns and find matches, misses, and diffs.
Arcade
Legal web emulation of open-source fantasy console homebrew.