Developer Tools
A growing set of fast, free, browser-based utilities built by the DOPE team. Nothing you paste ever leaves your browser.
JSON Formatter, Validator & Fixer
Format, validate, and explore JSON in a tree or minified view — and automatically repair broken JSON like trailing commas, single quotes, or missing brackets.
XML Formatter, Validator & Fixer
Format, validate, and explore XML in a tree or minified view — and automatically repair broken XML like unclosed tags, unquoted attributes, or unescaped ampersands.
JWT Decoder
Inspect the header, payload, and claims of a JSON Web Token.
MD Viewer
Preview Markdown as rendered HTML side-by-side with the raw source.
Encoder / Decoder
Type text or upload a file, pick an algorithm — Base64, URL, HTML entities, Hex, Binary, ROT13 — and see the result instantly.
Hash Generator
Type text, pick a hashing algorithm (MD5, SHA-1, SHA-256, SHA-512), and see the digest instantly.
Encrypt / Decrypt
Encrypt and decrypt text with a passphrase, right in your browser.
Password Generator
Generate secure passwords or passphrases with configurable length and character sets.
Calculators
Everyday calculators for tax, pricing, and more — the same kind of quick, practical tools you’d find on a calculator site, in the DOPE look.
Tax & VAT Calculator
Calculate withholding tax and VAT from a pre-tax price, a VAT-inclusive price, or a post-withholding price.
Price Worthiness Comparison
Compare two package sizes of the same product to see which one is the better value, and by how much.
Selling Price Calculator
Enter your cost and a desired profit margin or markup to find out what price to sell at.
Discount Calculator
Work out the final price, savings, or original price for percentage or fixed-amount discounts.
Loan & Installment Calculator
Estimate monthly payments for a mortgage, car loan, or personal loan from principal, rate, and term.
BMI Calculator
Calculate body mass index from height and weight, with the standard weight-category ranges.
Age & Date Calculator
Find your exact age, or the number of days between two dates.