OMNLI

Utilities

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Tools

Utilities

Developer

JSON Formatter

Format and validate JSON locally without sending its contents anywhere.

YAML Formatter

Format and validate YAML locally with precise line-aware errors.

XML Formatter

Beautify, minify, and validate XML entirely in your browser.

SQL Formatter

Format SQL for common dialects with flexible keyword and indentation options.

JSON โ†” CSV Converter

Convert arrays of JSON objects and correctly quoted CSV in either direction.

YAML โ†” JSON Converter

Convert YAML and JSON in either direction with validation before output.

Regex Tester

Test JavaScript regular expressions, groups, flags, and replacements live.

Markdown Preview

Write Markdown and view sanitized rendered HTML side by side.

Markdown to HTML

Convert Markdown to sanitized HTML locally and download the result.

HTML to Markdown

Convert HTML headings, links, tables, lists, and code blocks to Markdown.

Aspect Ratio Calculator

Calculate matching dimensions from common or custom aspect ratios.

Base64 Encoder/Decoder

Encode UTF-8 text or files and decode standard or URL-safe Base64.

URL Encoder/Decoder

Encode or decode complete URLs and individual URL components.

HTML Entity Encoder/Decoder

Safely encode reserved HTML characters or decode named and numeric entities.

Hash Generator

Generate SHA-1, SHA-256, SHA-384 or SHA-512 hashes for text and local files.

JWT Decoder

Decode JWT headers and payloads and show readable timestamp claims.

Unix Timestamp Converter

Convert epoch seconds or milliseconds to ISO and local dates and back.

Number Base Converter

Convert arbitrarily large integers between bases 2 and 36.

Email Validator

Check email syntax and flag common domain typing mistakes locally.

JSON Validator

Validate JSON and inspect its byte size, nesting depth and key count.

HTML Minifier

Minify HTML locally while preserving valid markup and protected content.

CSS Minifier

Optimize CSS locally and see exactly how many bytes you save.

JavaScript Minifier

Minify JavaScript with lazy-loaded Terser in a local Web Worker.

Color Converter

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

CSS Gradient Generator

Design linear, radial and conic gradients with editable color stops.

Generators

QR Code Generator

Create a downloadable QR code locally from text or structured data.

QR Code Reader

Decode a QR code from an image or your camera entirely on-device.

Wi-Fi QR Code Generator

Create a standard Wi-Fi login QR code without sharing credentials.

vCard QR Code Generator

Turn contact details into a vCard 3.0 or 4.0 QR code locally.

Random Number Generator

Generate unbiased secure random integers in a custom range.

Random Picker

Securely pick one or more entries from a pasted list.

Barcode Generator

Generate Code 128 barcodes and export them as PNG or SVG.

UUID Generator

Create cryptographically random UUID v4 values in bulk.

Security

Password Generator

Generate cryptographically secure passwords with custom character sets.

Password Strength Checker

Estimate password strength locally using entropy and pattern checks.

Passphrase Generator

Generate memorable passphrases from a bundled word list using secure randomness.

Text

Word Counter

Count words, characters, sentences, paragraphs and reading time live.

Character Counter

Count characters with or without spaces and check platform limits.

Case Converter

Convert text to uppercase, lowercase and popular naming conventions.

Remove Duplicate Lines

Remove repeated lines while preserving their first occurrence.

Text Cleaner

Clean whitespace, quotes, tabs and optional HTML from text.

Text Diff Checker

Compare two texts in inline or side-by-side mode.

Find & Replace Text

Find and replace plain text or regular-expression matches.

Text Sorter

Sort, reverse, shuffle or deduplicate lines.

Slug Generator

Turn text into a clean, URL-friendly slug.

Lorem Ipsum Generator

Generate local placeholder words, sentences, paragraphs or lists.

Calculators

Percentage Calculator

Calculate percentages, changes, increases and decreases locally.

Age Calculator

Calculate exact age and the countdown to the next birthday.

BMI Calculator

Calculate informational BMI using metric or imperial units.

Date Difference Calculator

Compare two dates using calendar and absolute differences.

Discount Calculator

Calculate final prices, savings, and reverse discounts.

Mortgage Calculator

Estimate mortgage payments, interest, and amortization.

Loan Calculator

Estimate loan payments, total repayment, and interest.

Compound Interest Calculator

Project compound growth and recurring contributions year by year.

Tip Calculator

Calculate a tip, total, and per-person amount.

Split Bill Calculator

Split a bill equally or by custom proportions with tax and tip.

Unit Converter

Convert length, mass, volume, temperature, area, speed, pressure and data size units.

Salary โ†” Hourly Calculator

Convert compensation between hourly, daily, weekly, monthly and annual rates.

VAT Calculator

Calculate net, VAT and gross amounts in either direction with any VAT rate.

Profit Margin Calculator

Calculate profit, margin and markup or solve a selling price from a target margin.

Date Calculator

Add or subtract calendar-aware days, weeks, months and years from a date.

Time Duration Calculator

Calculate overnight clock-time durations and optionally total multiple ranges.

Time Zone Converter

Convert a date and time from one IANA time zone into multiple destination zones.

Countdown Timer

Run a pausable browser countdown to a selected date and time.

Stopwatch

Measure elapsed time accurately with pause, resume and lap history.

Scientific Calculator

Calculate expressions safely with trig, logs, powers, roots, constants and memory.

Accessibility

WCAG Contrast Checker

Check color contrast against WCAG AA and AAA thresholds.

SEO

Meta Tag Generator

Generate title, canonical, robots and social metadata safely.

UTM Builder

Build correctly encoded campaign URLs without losing existing parameters.

Robots.txt Generator

Create User-agent, Allow, Disallow and Sitemap directives.

SERP Snippet Preview

Preview a search result on desktop or mobile with length guidance.