Easutil — 105+ Free Online Tools for Developers & Everyday Use

Upload or paste JSON, CSV, XML, YAML, text or images and see detected format, metadata, structure, encoding and validation results with related tools.

Dev / 27

DEV/FORMAT

JSON Formatter

Prettify, minify, and validate JSON data strings instantly.

DEV/SQL

SQL Editor & Checker

Format SQL and lint for missing WHERE, unmatched quotes, and common mistakes.

DEV/AUTH

JWT Debugger

Decode and inspect JSON Web Token headers and payloads.

DEV/DIFF

JSON Diff

Compare two JSON objects and highlight added, removed, and changed keys.

DEV/CSS

CSS Minifier

Minify CSS by stripping whitespace, comments, and redundant characters.

DEV/SEO

Meta Tag Generator

Generate SEO meta, Open Graph, and Twitter Card tags for any page.

DEV/STRING

String Escape

Escape and unescape strings for JS, JSON, and other quoted contexts.

DEV/REF

HTTP Status Codes

Searchable reference for common HTTP status codes and their meanings.

DEV/REF

Regex Cheatsheet

Searchable reference for regex tokens, quantifiers, groups, lookarounds, and flags.

DEV/NET

IP Subnet Calculator

Compute network, broadcast, host range, and usable IPs from any IPv4 CIDR.

DEV/JSON

JSON Path Query

Query JSON with dot and bracket notation and see the resolved value instantly.

DEV/URL

UTM Link Builder

Build campaign-tracked URLs with utm_source, medium, campaign, term, and content parameters.

DEV/TYPES

JSON to TypeScript

Turn any JSON payload into TypeScript interfaces with nested type inference.

DEV/SQL

SQL Query Explainer

Paste any SQL query and get a plain-English explanation of every clause: SELECT, JOIN, WHERE, GROUP BY, HAVING, and more.

DEV/HTTP

cURL to Fetch / Axios

Convert any cURL command into ready-to-run fetch, axios, or Node.js request code.

DEV/CONFIG

.env ↔ JSON

Convert .env files to JSON and back — handy for config, CI secrets, and deploy dashboards.

DEV/GIT

.gitignore Generator

Build a .gitignore from stack presets: Node, Python, Go, Rust, Docker, Terraform, editors, and OS files.

DEV/URL

URL Inspector & Query Editor

Break any URL into protocol, host, path, hash, and editable query parameters.

DEV/MARKDOWN

Markdown Table Generator

Turn CSV, TSV, or pipe-separated rows into a clean aligned Markdown table for READMEs and docs.

DEV/SCHED

Cron Editor & Next Runs

Build, explain, and validate crontab expressions and preview the next 8 local run times.

DEV/VERSION

Semver Range Checker

Test which versions satisfy a semver range like ^1.2.0 and sort versions correctly.

DEV/REACT

HTML to JSX Converter

Convert HTML to valid JSX: className, htmlFor, style objects, comments and void tags.

DEV/UNIX

Chmod Permission Calculator

Convert between octal, symbolic and checkbox file permissions with a ready chmod command.

DEV/DETECT

Smart Paste

Paste any content — JSON, JWT, Base64, URL, SQL, CSV, XML, YAML, HTML, CSS, JS, Markdown, timestamps, cron, UUIDs — and get the format detected with the right tools suggested instantly.

DEV/SEO

Website Health Snapshot

Analyze any URL for title, meta description, Open Graph, Twitter Cards, canonical, favicon, robots.txt, sitemap.xml, HTTPS, security headers and SEO recommendations.

DEV/API

API Response Playground

Explore any JSON API response with a beautified view, collapsible tree, search, copy and download — then generate TypeScript, Python, Java and C# models.

DEV/GIT

Git Command Cheatsheet

Searchable reference of everyday Git commands for branching, undoing and inspecting history.

Image / 8

DESIGN/COLOR

Color Picker

HEX/RGB/HSL picker with contrast ratio tool.

DESIGN/PALETTE

Color Scheme Maker

Build and preview palettes: analogous, complementary, triadic, mono, shades.

IMAGE/OPTIMIZE

Image Compressor

Client-side JPEG re-encoding to shrink images.

DESIGN/CSS

CSS Gradient Generator

Design linear and radial CSS gradients with live preview and copy-ready code.

DESIGN/CSS

Box Shadow Generator

Craft box-shadow values with sliders and copy the CSS instantly.

DESIGN/TYPE

Font Pair Generator

Preview curated Google Font heading + body pairings for websites and apps, randomize combos, and copy ready-to-use CSS.

IMAGE/CONVERT

Image Converter

Convert PNG, JPEG and WebP images, resize by max width and compare file sizes — fully in-browser.

IMAGE/SVG

SVG Optimizer

Minify SVG markup and export it as a data URI or a ready-to-paste React component.

PDF / 1

PDF/MERGE

PDF Merge

Combine multiple PDFs into a single document, client-side.

Crypto / 5

CRYPTO/PWD

Password Gen

Entropy-based passwords with configurable character sets.

CRYPTO/HASH

Hash Generator

Compute SHA-1, SHA-256, SHA-384, SHA-512 hashes.

CRYPTO/LUHN

Credit Card Validator

Check card numbers with the Luhn algorithm and detect the card brand.

CRYPTO/AES

Text Encrypt / Decrypt

AES-256-GCM text encryption with PBKDF2 password derivation, all in-browser.

CRYPTO/AUDIT

Password Strength Checker

Estimate password entropy, character-set coverage, and crack time in real time.

Convert / 10

CONVERT/UNIT

Unit Converter

Convert length, mass, volume, and time.

CONVERT/TIME

Timestamp Converter

Convert between Unix timestamps and ISO 8601 dates with relative time.

CONVERT/DATA

YAML ↔ JSON

Convert between YAML and JSON with error reporting.

CONVERT/NUM

Number Base Converter

Convert numbers between binary, octal, decimal, and hex.

CONVERT/TIME

Timezone Converter

See any datetime across major world timezones side-by-side.

CONVERT/BIN

Binary ↔ Text

Convert text to binary (8-bit) and back with instant preview.

CONVERT/NUM

Roman Numeral Converter

Convert between Arabic numbers (1–3999) and Roman numerals.

TIME/OVERLAP

Meeting Time Finder

Find overlapping business hours across multiple countries and timezones — no signups, works entirely in your browser.

CONVERT/DATA

CSV ↔ JSON Converter

Convert CSV to JSON and JSON arrays back to CSV with header detection and download.

CONVERT/CSS

CSS Unit Converter

Convert px, rem, em, pt and % with configurable root and parent font sizes.

Generators / 10

GEN/ID

UUID Generator

Bulk generate secure v4 universally unique identifiers.

GEN/QR

QR Code Generator

Create high-resolution QR codes for URLs or text.

GEN/TEXT

Lorem Ipsum

Placeholder text generator with paragraph control.

GEN/RANDOM

Random Number

Generate one or many random integers within a custom range.

GEN/RANDOM

Dice Roller

Roll standard tabletop dice (d4–d100) with sum totals.

GEN/TIME

Pomodoro Timer

Focus timer with configurable work and break intervals and cycle counter.

GEN/EMAIL

Email Signature Maker

Design a clean HTML email signature with avatar, socials, and accent color. Copy as rich text or raw HTML for Gmail, Outlook, and Apple Mail.

GEN/SHARE

Social Share Link Generator

Generate ready-to-use share URLs for WhatsApp, X, LinkedIn, Facebook, Reddit, Telegram, Pinterest, and email from any URL and title.

GEN/ICON

Favicon Generator

Generate 16–512px favicons from letters or an image, with the HTML link snippet.

GEN/DATA

Mock Data Generator

Generate realistic fake users, countries, currencies, products and transactions as JSON, CSV, or SQL INSERT statements.

Calculators / 8

CALC/DATE

Age Calculator

Calculate exact age in years, months, and days from a date of birth.

CALC/MATH

Percentage Calculator

Compute percentage of, percentage change, and ratios in one place.

CALC/MONEY

Tip Calculator

Split bills and calculate tips per person with a live slider.

CALC/HEALTH

BMI Calculator

Calculate body mass index from height and weight with category ranges.

CALC/MONEY

Loan / EMI Calculator

Compute EMI, total interest, and total payment for any loan.

CALC/MONEY

Discount Calculator

Compute savings and final price for any percentage discount.

MATH/RATIO

Aspect Ratio Calculator

Solve width or height for any aspect ratio with presets and a live preview box.

TIME/DATE

Date Difference Calculator

Days, weekdays, weeks and years between two dates, plus add or subtract from a date.

AI / 10

AI/PROMPT

Diagrams / 6

DIAGRAM/MERMAID