All tools

Markdown Preview

Write Markdown on the left and see the rendered preview on the right in your browser.

JSON Formatter

Format, validate, and minify JSON in your browser.

UUID Generator

Generate random UUID v4 identifiers instantly.

Base64 Encode / Decode

Encode or decode Base64 with proper UTF-8 handling.

Timestamp Converter

Convert Unix time, milliseconds, and ISO-8601 strings.

JWT Decoder

Inspect JWT header and payload (decode only, no verification).

Regex Tester

Test JavaScript regular expressions against sample text in your browser.

Text Diff

Compare two texts line by line and highlight additions and removals.

JSON to CSV

Turn a JSON array of objects into a comma-separated table you can paste into a spreadsheet.

Cron Expression Helper

Build common cron schedules and preview upcoming run times.

Time Zone Converter

Compare the same moment across regions, with daylight saving handled.

Date Calculator

Add or subtract days and compute the difference between dates.

Age Calculator

Calculate exact age from a birth date.

Loan Payment Calculator

Estimate monthly payment, total paid, and interest for a fixed-rate loan.

ROI Calculator

Compute return on investment as a percentage from starting and ending amounts.

Image Compressor

Shrink JPG, PNG, and WebP images locally in your browser.

PDF Merge

Combine multiple PDF files into one download.