Artifacts

Formats, validates and minifies JSON in the browser, with 2 or 4 space indents.

Edits, formats and validates JSON text, with a tree view, in a browser tab.

Combines several PDF files into one document in the browser.

Creates passwords on the device with the Web Crypto API, with an easy-type mode and a maximum-security mode.

Tries regular expressions against sample text and shows matches live.

Converts an annual salary into hourly, daily and monthly pay.

Switches images between JPG, PNG, WebP and GIF locally, with no uploads.

Converts UTF-8 text to Base64 and Base64 strings back to text.

XORs text with a passphrase to scramble and unscramble it in the browser.

Turns pasted or typed text into a multi-page PDF, fully in the browser.

Counts single words and phrases in text and works offline, with content staying on the device.

Client-side form that appends UTM parameters to a URL for traffic attribution.

Counts how often each word appears in pasted text, in the browser.

Offline Markdown reader and editor with live preview, math, diagrams and a distraction-free mode.

Suggests several rewritten, SEO-minded titles for an article headline.

German-language calculator that converts duct air speed to volumetric flow and back.

Invoice template tailored to auto repair shops with parts and labour lines.

Reads Base64-URL encoded MessagePack data and shows it as JSON.

Builds a customised invoice and downloads it as a PDF, with no signup.

Invoice and receipt templates (10+) that download as PDF.

Prices an option with the Cox-Ross-Rubinstein binomial model from spot, strike, rate and volatility.

Computes body mass index and category from height and weight in metric or imperial units.

Counts Monday to Friday working days between two dates, with your own holidays excluded.

Computes BMR, TDEE, calorie deficits of 10 to 40 percent and daily protein targets.