Skip to content

Free Online Tools

Formatters, converters, calculators, and generators that run entirely in your browser. No sign-up. No data collection. No server processing.

Browse All Tools

Popular Tools

JSON Formatter & Validator

Format, beautify, minify, and validate JSON data online. Instant error detection with line numbers.

Base64 Encoder / Decoder

Encode and decode Base64 strings online. Supports text and URL-safe Base64 encoding.

Color Converter

Convert colors between HEX, RGB, and HSL formats. Live preview with instant copy-to-clipboard.

Compound Interest Calculator

Calculate compound interest with monthly contributions. See year-by-year growth breakdowns.

Regex Tester

Test regular expressions with live highlighting, match details, and capture group extraction.

Browse by Category

Developer Tools

View all →
JSON Formatter & Validator
Format, beautify, minify, and validate JSON data online. Instant error detection with line numbers.
Base64 Encoder / Decoder
Encode and decode Base64 strings online. Supports text and URL-safe Base64 encoding.
URL Encoder / Decoder
Encode and decode URL strings online. Supports full URL and component encoding.

Financial Calculators

View all →
Compound Interest Calculator
Calculate compound interest with monthly contributions. See year-by-year growth breakdowns.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and amortization schedule.

CSS Generators

View all →
Color Converter
Convert colors between HEX, RGB, and HSL formats. Live preview with instant copy-to-clipboard.
CSS Box Shadow Generator
Generate CSS box-shadow values with a visual editor. Multiple layers, presets, and live preview.
CSS Gradient Generator
Create linear, radial, and conic CSS gradients with a visual editor. Presets and multi-stop support.

Content Tools

View all →
Word & Character Counter
Count words, characters, sentences, and paragraphs. Estimate reading time for any text.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words. Copy with one click.
Markdown Preview
Write Markdown and see a live HTML preview. Supports headers, lists, code blocks, links, and images.

About Mocari

Mocari provides free browser-based tools that respect your privacy. Every tool runs client-side — your data never leaves your device. No accounts, no tracking cookies, no server-side processing. Bookmark any tool and use it whenever you need it.