Workbench

Small, fast tools that run entirely in your browser.

Every tool on this site is a single hand-written HTML file. Nothing tracks you, nothing asks you to sign in, and nothing calls home: no frameworks, no cookies, no network requests. Once a page has loaded, it keeps working offline.

Projects

• Gearbox a little machine shop: place gears, mesh them, strap pulleys together with belts straight or crossed, key a cam onto any turning shaft, drive a piston from a crank pin with rod and slider, lock a shaft one way with a ratchet and pawl, and pace a whole train with a pendulum escapement you can hear tick and strike the hour, and wind a going weight that runs the clock down — honest ratios, real turning, torque chips that show the exact trade; every change can be undone and redone; name and keep your own machines in your browser, load a shelf of ready-made ones, take the thirteen-puzzle trail, download any bench as a picture, and any bench travels as a link
• Calendar Contraptions every calendar is a machine someone bolted together — take one apart: live counters, converters, the stories behind the dates

Tools

• Epoch Converter Unix timestamps ↔ human dates, live
• Cron Explainer cron expressions in plain English + next runs
• Checksum Tool SHA-256/384/512/SHA-1 for text & files, no uploads
• Base64 & URL Encoder encode/decode Base64 (UTF-8, URL-safe) and percent-encoding
• JSON Formatter format & validate JSON with exact error positions
• UUID Generator random v4 UUIDs in bulk + an inspector for any UUID
• Text Diff compare two texts line by line, copy the diff as a patch
• Color Picker hex / rgb / hsl side by side, text-contrast check, shades
• Unit Converter length, mass, temperature and more — every unit side by side
• QR Code Generator any text or URL to a QR code, download as PNG or SVG
• Password Generator random passwords or memorable word passphrases, from your device's secure random source
• Markdown Table Generator paste CSV or TSV, get a tidy markdown table, aligned and copy-ready
• Word Counter words, characters, sentences, reading time and top keywords, live
• Case Converter eleven letter cases at once — camel, snake, kebab, Title, Sentence and friends
• CSS Gradient Generator linear, radial and conic gradients with full stop control, PNG export
• Lorem Ipsum Generator classic placeholder text — exact paragraphs, sentences, words or list items
• Stopwatch & Timer count up with laps or count down with an alarm beep — stays accurate in a background tab
• Metronome a steady click at any tempo — accents, subdivisions and tap tempo, straight from the audio clock
• Tone Generator any frequency from 20 Hz to 20 kHz — note readout, tuning presets and a sweep for hunting rattles
• Date Calculator days between dates, add or subtract months and years correctly, facts about any date
• Number Base Converter binary, octal, decimal, hex or any base 2–36 — type in any box, exact big numbers
• CSV ⇄ JSON Converter both directions with correct quoting, delimiter sniffing and type detection
• Interval & Tabata Timer work / rest intervals with rounds and sets — beeps stay on schedule in a background tab
• Ear Trainer name intervals or chord qualities by ear — difficulty levels, playback styles, streak record
• Color Palette Extractor drop in an image, get its dominant colors as ready-to-copy hex codes
• Image Resizer & Compressor shrink images to a max width or height, re-encode as JPEG, WebP or PNG
• Image Rotate & Flip turn in 90° steps or mirror — undo and retry freely, quality never stacks up
• Countdown live days / hours / minutes / seconds until any date — save it or share it as a link
• Time Zone Meeting Planner pick cities, read the color-coded 24-hour grid, find the hour that works for everyone

Notes

• Why everything here runs in your browser what client-side means, and how to verify it
• What's inside a QR code finder patterns, encoding modes, masks — and why a torn corner still scans
• The traps hiding in CSV files quoting rules, Excel's silent edits, BOM trouble — and how to catch each one
• Why 4.5:1 where the contrast rule comes from, and the gray that fails by 0.03
• JSON's sharp edges the 2^53 cliff, silent nulls, duplicate keys, the missing date type, the BOM
• What a diff actually says edit scripts, hunk headers, context anchors — and the questions a diff can't answer

About

Workbench is a personal collection of web utilities, built a little at a time. If something here saved you a minute or two, that is the whole point.