Nova Tools

Handy browser tools — no install, no sign-up required.

Generate

QR Code Generator

Generate QR codes from text or URLs in your browser. Free, no install.

Password Generator

Generate secure random passwords in your browser. Nothing is sent to a server.

Generate random UUID v4 values in your browser.

Generate an ASCII directory tree from an indented list of paths.

Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of text or files in your browser. Nothing is sent to a server.

Dummy Text Generator

Generate Lorem ipsum or Japanese placeholder text by paragraph count or character count.

Dummy Data Generator

Generate fake personal data like names, emails, and addresses as JSON or CSV for testing.

Favicon Generator

Generate favicon.ico and PNG icons in every size from one image, entirely in your browser.

Random Picker & Team Splitter

Draw random winners from a list or split entries into teams, right in your browser.

Format

Format or minify JSON and validate it in your browser.

Line Sorter & Dedupe

Sort text lines, remove duplicates and empty lines, reverse or shuffle — all in your browser.

Search and replace text with plain strings or regular expressions, right in your browser.

Markdown Preview

Write Markdown and preview the rendered result live, then copy the generated HTML.

Convert

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Color Converter

Convert colors between HEX, RGB, and HSL with a live preview.

Convert length, weight, temperature, area, volume, speed, data size, and time units in your browser.

Date Calculator

Count days between two dates, add or subtract days, and view weekday, week number, and Japanese era.

Base64 Encode / Decode

Encode text to Base64 or decode it back, with URL-safe support and file to data URI conversion — all in your browser.

URL Encode / Decode

Percent-encode or decode URLs and query strings in your browser.

Escape special characters into HTML entities, or decode named and numeric entities back to text.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal. Handles arbitrarily large integers.

Unicode Converter

Convert text to Unicode code points, UTF-8 bytes, and HTML entities — and back.

Test

Test regex patterns in real time with match highlighting.

Cron Expression Checker

Parse a cron expression to see what it means and when it runs next. Free, in your browser.

Contrast Checker

Compute the contrast ratio between text and background colors and check WCAG AA/AAA compliance.

Analyze

Character Counter

Count characters, words, and lines in your text in real time.

Decode the header and payload of a JWT (JSON Web Token) in your browser. Your token is never sent anywhere.

Color Palette Extractor

Extract the dominant colors from an image and copy them as HEX codes.

Email / URL Extractor

Extract all email addresses, URLs, or domain names from any text, with duplicates removed.

IPv4 / CIDR Calculator

Compute network address, broadcast, host range, and subnet mask from an IPv4 address in CIDR notation.