All tools

Twenty focused, client-side utilities with clear UX and privacy-minded defaults.

JSON Editor

Edit, format, repair, query, compare, and explore JSON in text, tree, and table modes.

Format, minify, and validate JSON in your browser.

Check whether your JSON is valid and locate errors.

Convert a JSON array into CSV for spreadsheets.

Turn CSV spreadsheets into JSON arrays.

Encode and decode Base64 text locally.

Percent-encode and decode URL components.

Generate one or many UUID v4 identifiers.

Decode or generate JWTs locally — secrets never leave your browser.

Test regular expressions against sample text.

Convert Unix timestamps to dates and back.

Count words, sentences, paragraphs, and more.

Count characters with and without spaces.

Convert text between common casing styles.

Deduplicate lines while preserving order.

Sort lines ascending or descending.

Calculate percentages, ratios, and percent change.

Calculate exact age in years, months, and days.

Find the span between two dates.

Convert length, weight, temperature, and more.

Estimate monthly payments for a fixed-rate loan.