Search All 195+ Free In-Browser Online Tools

Free online JSON formatter, validator, and minifier. Beautify messy JSON data, validate syntax, and spot errors with line markers in real-time.

Base64 Encoder

Fast and secure online Base64 encoder. Convert text, strings, and UTF-8 characters to standard and URL-safe Base64 instantly in your browser.

Base64 Decoder

Decode Base64 strings to readable UTF-8 plain text online. Handles standard, padded, and URL-safe Base64 format with automatic padding repair.

Base64 Encoder & Decoder

Convert text to Base64 and decode Base64 back into readable UTF-8 text in one unified workspace with URL-safe options.

URL Encoder & Decoder

Encode and decode URLs and URI query parameters with standard percent-encoding in your browser.

JWT Decoder & Inspector

Decode and inspect JSON Web Tokens (JWT) safely in your browser. View header algorithms, payload claims, and expiration timestamps.

UUID / GUID Generator

Generate cryptographically secure Version-4 UUIDs and GUIDs individually or in bulk. Customize hyphens, uppercase, and braces.

Hash Generator (MD5, SHA-256, SHA-512)

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic checksum hashes in real-time in your browser with Web Crypto API.

HTML Entity Encoder & Decoder

Encode special characters into HTML numeric entities and decode HTML entities back into characters.

Unix Timestamp Converter

Convert Unix epoch timestamps (seconds and milliseconds) to human-readable UTC, ISO 8601, and local date times.

Cron Expression Generator & Explainer

Parse crontab expressions into plain English explanations and schedule timings with field-by-field breakdown.

Chmod Permissions Calculator

Interactive Linux file permissions calculator. Convert between Octal (755, 644, 777), Symbolic (rwxr-xr-x), and checkbox permissions.

HTML Formatter & Beautifier

Format, beautify, and indent HTML markup online. Fix messy web page code with customizable 2-space or 4-space indentation.

HTML Minifier & Compressor

Minify HTML code by stripping comments, extra whitespace, and line breaks to optimize web page load times and SEO performance.

CSS Formatter & Beautifier

Format, indent, and beautify CSS stylesheets online. Standardize CSS rule formatting and spacing instantly in your browser.

CSS Minifier & Optimizer

Compress CSS stylesheets by removing whitespace, comments, and redundant semicolons to boost page speed.

JavaScript Formatter & Beautifier

Format, indent, and beautify JavaScript code online. Convert minified or messy JS scripts into clean, readable code.

JavaScript Minifier

Minify JavaScript scripts by stripping comments, extra line breaks, and unnecessary whitespace in your browser.

JSON Minifier & Compact Tool

Compress and minify JSON data into a single line to optimize API payloads, database storage, and network transmissions.

SQL Query Formatter & Beautifier

Format, indent, and uppercase SQL queries (MySQL, PostgreSQL, SQLite, MS SQL) for maximum database readability.

HTML to JSX / React Converter

Convert raw HTML code into React JSX syntax. Auto-converts class to className, for to htmlFor, inline styles to objects, and self-closes tags.

CSS to JS / React Style Converter

Convert kebab-case CSS declarations into camelCase JavaScript style objects ready for React, React Native, and styled-components.

cURL Command to Code Converter

Convert cURL terminal commands into modern JavaScript Fetch API, Axios requests, or Python requests code in seconds.

JSON Diff & Comparison Tool

Compare two JSON objects or files side-by-side to find added, deleted, and modified keys and values in real-time.

Regex Tester & Regular Expression Debugger

Test and debug JavaScript regular expressions in real-time with instant match highlighting, capture group extraction, and flag controls.

Markdown Previewer & Live Split Editor

Live split-screen Markdown editor with real-time HTML preview, table formatting, code syntax highlighting, and HTML/MD export.

JavaScript Keycode & Event Inspector

Press any key on your keyboard to instantly inspect event.key, event.code, event.which, and modifier keys (Ctrl, Alt, Shift, Meta).

SemVer Comparator & Range Tester

Compare semantic version numbers (Major.Minor.Patch-Prerelease) according to the SemVer 2.0.0 specification.

.env to JSON & Docker Compose Converter

Convert .env environment configuration files into JSON key-value objects and Docker Compose environment YAML syntax.

URL Query Parameter Parser & Builder

Parse URLs into protocol, hostname, path, hash, and query parameters. Edit, add, and reconstruct query strings in seconds.

Subdomain & Hostname Extractor

Extract unique hostnames, subdomains, and root domains from lists of URLs, log files, and raw text.

Credit Card Luhn Algorithm Validator

Validate credit card, debit card, and IMEI numbers using the MOD 10 Luhn checksum algorithm. 100% private in-browser validation with zero data storage.

CIDR & Subnet Range Calculator

Calculate IPv4 CIDR blocks, subnet masks, usable host ranges, network addresses, and broadcast addresses instantly.

IP to Integer & Hex Converter

Convert IPv4 dotted-decimal addresses into 32-bit unsigned integers, hexadecimal, and binary formats for database optimization.

IPv6 Address Expander & Compressor

Expand compressed IPv6 addresses into full 32-digit 8-hextet format, or compress long IPv6 addresses using standard RFC 5952 zero-suppression.

SPF Record Generator

Interactive SPF record creation wizard. Build secure v=spf1 DNS TXT records with MX, IPv4/IPv6, and third-party email provider includes.

DMARC Policy Generator

Generate compliant _dmarc DNS TXT records to protect your domain from email spoofing and phishing with aggregate reporting (RUA) tags.

Robots.txt Generator

Create a search-engine friendly robots.txt file for Googlebot, Bingbot, and web crawlers with custom disallow rules and XML sitemap link.

XML Sitemap Generator

Generate clean XML sitemap files for Google Search Console and Bing Webmaster Tools from a list of URLs with lastmod timestamps.

Meta Tag & Open Graph Generator

Generate complete HTML SEO meta tags, Open Graph (OG) Facebook tags, and Twitter Cards with live snippet preview.

XML Validator & Syntax Checker

Validate XML syntax and check for well-formedness online in your browser. Highlights exact line and column errors with zero server file uploads.

HTTP Request & REST API Mock Tester

Lightweight in-browser REST API tester. Send GET, POST, PUT, PATCH, DELETE requests with custom headers and JSON body to test APIs in real-time.

Git Command Generator & Interactive Helper

Generate Git commands visually for branching, merging, stashing, rebasing, committing, and undoing mistakes with one-click copy.

MAC Address Formatter & Standardizer

Format and convert MAC addresses between Colon (00:1A:2B:3C:4D:5E), Hyphen (00-1A-2B-3C-4D-5E), Dot (001a.2b3c.4d5e Cisco), and raw hexadecimal.

HTTP Status Code Reference & Lookup

Complete HTTP response status codes guide (100 to 599). Instant search and lookup with RFC definitions, common causes, and troubleshooting steps.

MIME Type & File Extension Reference Guide

Search and lookup standard Content-Type MIME types and corresponding file extensions for web development, HTTP headers, and API responses.

AES-GCM 256-bit Text & File Encryptor / Decryptor

Encrypt and decrypt text and data with AES-256-GCM using Web Crypto API. Password protected with PBKDF2 key derivation and zero server uploads.

RSA Key Pair Generator (2048 & 4096-bit PEM)

Generate cryptographically secure RSA public and private key pairs (2048-bit, 4096-bit) in PEM format directly in your browser with zero server uploads.

Large File Checksum & Hash Calculator

Calculate SHA-256, SHA-512, SHA-1, and MD5 checksums for large files in your browser. Stream-processed locally with zero server file uploads.

HMAC Signature Generator (SHA-256, SHA-512, SHA-1)

Generate HMAC (Hash-based Message Authentication Code) signatures online using SHA-256, SHA-512, and SHA-1 with custom secret keys.

Password Strength & Crack-Time Estimator

Test password strength and crack resistance. Analyzes entropy, brute-force crack time across GPU clusters, dictionary patterns, and security tips.

Public Key / X.509 Certificate Decoder & Inspector

Decode and inspect X.509 SSL/TLS certificates and CSR files in PEM format. View Issuer, Subject, Validity dates, SANs, and Public Key algorithms.

Bcrypt Hash Generator & Verifier

Generate and verify Bcrypt password hashes online. Customizable work factor (salt rounds 4-16) with instant hash comparison.

PBKDF2 Key Derivation Generator

Derive cryptographic keys from passwords using PBKDF2 (Password-Based Key Derivation Function 2) with HMAC-SHA256/SHA-512 via Web Crypto API.

Random Secret & API Key / Token Generator

Generate cryptographically random API keys, secret tokens, JWT secret keys, and webhook signing secrets in Hex, Base64, and alphanumeric formats.

DKIM Record Generator & RSA Keypair Builder

Generate DKIM (DomainKeys Identified Mail) RSA 2048-bit keypairs and format DNS TXT records for your domain in your browser with zero server uploads.

Schema.org JSON-LD Validator & Rich Snippet Checker

Validate Schema.org JSON-LD structured data and check rich snippet compliance for Article, Product, Organization, FAQ, and Breadcrumb markup.

cURL to Code Converter

Convert raw cURL CLI commands into clean, ready-to-run API request code for JavaScript (Fetch/Axios), Python (Requests), PHP (cURL/Guzzle), Go, Rust, and C#.

Cron Schedule Visualizer & Human Explainer

Parse and test crontab expressions in real-time. Get plain English human explanations, syntax breakdowns, and see the next 10 exact execution timestamps.

Australian Business Number (ABN) Validator

Validate 11-digit Australian Business Numbers (ABNs) instantly using the official Australian Taxation Office (ATO) Modulus 89 checksum algorithm. 100% private in-browser validation.

International IBAN & BIC/SWIFT Validator

Validate International Bank Account Numbers (IBAN) and SWIFT/BIC codes online using ISO 13616 and ISO 7064 Mod 97-10 checksum validation across Germany, UK, UAE, EU, and 80+ countries.

VLSM (Variable Length Subnet Mask) Calculator

Calculate Variable Length Subnet Masking (VLSM) IP allocations online. Input a major network CIDR and subnet host requirements to generate network addresses, usable ranges, and broadcast IPs.

Word & Character Counter

Free real-time online word counter and character counter. Calculate words, characters (with and without spaces), reading time, and speaking time.

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case, and PascalCase instantly.

Line Sorter & Deduplicator

Sort text lines alphabetically (A-Z or Z-A), numerically, by line length, or reverse. Remove duplicate lines with one click.

Text Cleaner & Whitespace Remover

Clean messy text by removing duplicate spaces, blank lines, tabs, HTML tags, and trailing whitespace in your browser.

Lorem Ipsum Dummy Text Generator

Generate custom standard Latin dummy placeholder text for mockups, websites, and graphic designs. Customize paragraphs, sentences, and word count.

URL Slug Generator

Convert titles, headlines, and strings into clean, SEO-friendly URL slugs. Strips special characters, accents, and punctuation instantly.

Find & Replace Text Tool

Search and replace words, characters, and regular expression patterns in long text documents in real time.

Reverse Text & Flip Text Generator

Reverse text backwards, reverse word orders, reverse lines, or flip characters upside down for social media and creative typography.

Binary to Text Converter

Convert 8-bit binary code (0s and 1s) into human-readable plain text and UTF-8 ASCII characters online.

Text to Binary Converter

Convert plain English text and strings into 8-bit binary code (0s and 1s) instantly in your browser.

Rot13 Cipher Encoder & Decoder

Rotate text characters by 13 positions with standard ROT13 Caesar cipher substitution. Symmetrical encode and decode in real time.

Text to Morse Code Converter

Convert text and sentences into international Morse code dots (.) and dashes (-). Translate letters and numbers to Morse code instantly.

Add Line Numbers to Text

Add sequential line numbers to text, scripts, and code snippets online. Customize starting numbers and leading zero padding.

Emoji Remover & Text Sanitizer

Remove all emojis, smileys, and Unicode pictographs from your text with one click. Clean text for databases, SMS, and formal documents.

Invisible & Zero-Width Space Cleaner

Detect and remove invisible zero-width spaces (ZWSP, ZWNJ, ZWJ, BOM) that cause copy-paste errors, broken code, and hidden text anomalies.

Prefix & Suffix Line Adder

Add custom prefix text to the beginning and suffix text to the end of every line in bulk online. Perfect for SQL queries, HTML tags, and code formatting.

Palindrome Checker

Check whether a word, phrase, number, or sequence reads the same backwards as forward. Automatically ignores punctuation, spaces, and casing.

Social Media Character Counter

Real-time character counter with live limit meters for Twitter/X (280), LinkedIn (3,000), Instagram Captions (2,200), Instagram Bio (150), and Google SEO.

Text Repeater & String Multiplier

Repeat any text, message, or string up to 10,000 times online. Customize custom delimiters (new line, comma, space, period) with one click.

Word & Keyword Frequency Counter

Analyze word frequency and keyword density in articles and essays. Find the most repeated words, percentages, and occurrence counts.

Hashtag Generator & Extractor

Generate Instagram, TikTok, Twitter, and LinkedIn hashtags from your text or keywords. Automatically removes stop words and formats clean tags.

Instagram Bio Spacing & Line Break Formatter

Format clean line breaks and spacing for Instagram Bio and captions without awkward dots or symbols. Copy and paste directly into Instagram.

Unicode Fancy Font & Nickname Generator

Convert plain text into cool, aesthetic Unicode fonts: Bold, Italic, Gothic/Fraktur, Double-Struck, Monospace, and Bubble text for Instagram and Discord.

YouTube Tag Comma Separator & Formatter

Format YouTube video tags into comma-separated lists. Checks YouTube's 500-character tag limit and deduplicates tags instantly.

Text Diff Checker (Side-by-Side Comparison)

Compare two pieces of text side-by-side or line-by-line to find insertions, deletions, and differences instantly in your browser.

NATO Phonetic Alphabet Translator

Convert text and spell out words in NATO Phonetic Alphabet (Alfa, Bravo, Charlie) or decode phonetic strings back into plain English.

Text to ASCII Art & Figlet Banner Generator

Generate retro ASCII art text banners and Figlet style headlines for README files, terminal headers, and social profiles.

Zalgo & Cursed Text Generator

Generate cursed, glitchy, corrupted Zalgo text with customizable chaos intensity. Perfect for Discord, gaming nicknames, and memes.

Readability Score Calculator

Analyze text readability with Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau, and ARI metrics.

Text Truncator & Ellipsis Formatter

Truncate text by character or word count while preserving whole words and adding custom ellipsis characters.

Google SERP Title & Meta Description Previewer

Preview how your web page title and meta description will appear in Google Desktop and Mobile search results with pixel width checks.

Columnar / Markdown Table Extractor & Cleaner

Extract, clean, and format columnar data and Markdown tables. Convert space-aligned text into neat Markdown, CSV, or TSV tables.

SRT Subtitle Timestamp Offset & Resync Tool

Shift, offset, and synchronize SRT subtitle timestamps online. Add or subtract milliseconds, seconds, or minutes with instant SRT file download.

Twitter / X Character Counter

Free real-time Twitter/X character counter with 280-character limit tracker, live tweet preview, emoji count, and multi-tweet thread splitter.

LinkedIn Post Character Counter

Calculate LinkedIn post length against the 3,000-character limit. Preview the crucial 140-character "See more" fold to optimize hook engagement.

Instagram Caption Character Counter

Check Instagram caption length up to 2,200 characters, track 30 hashtag limits, and preserve clean spacing with zero dots.

Instagram Bio Character Counter

Free Instagram bio character counter with strict 150-character limit tracking, line break helper, and profile preview.

Interactive Markdown Table Generator

Create, edit, and format Markdown tables visually in an interactive spreadsheet grid. Add columns, set text alignment (left, center, right), and export clean GitHub-ready Markdown.

JSON to CSV Converter

CSV Tools

Convert JSON arrays or nested objects into clean, downloadable CSV files in real time. 100% private client-side converter.

CSV to JSON Converter

CSV Tools

Convert CSV text and files into clean JSON objects or 2D arrays directly in your browser. Auto-detects delimiters, numbers, and boolean values.

Number Base Converter

Convert numbers between Decimal (Base 10), Binary (Base 2), Hexadecimal (Base 16), and Octal (Base 8) in real-time.

JSON to XML Converter

Convert JSON objects and arrays into structured, indented XML documents instantly in your browser.

XML to JSON Converter

Convert XML documents and feeds into clean, formatted JSON arrays and objects in your browser.

JSON to YAML Converter

Transform JSON data structures into clean, indented YAML for Kubernetes, Docker Compose, and CI/CD pipelines.

YAML to JSON Converter

Parse and convert YAML configuration files into JSON format online. Perfect for DevOps configs and API payloads.

Markdown to HTML Converter

Convert GitHub flavored Markdown into clean, semantic HTML code with instant preview.

HTML to Markdown Converter

Convert raw HTML web page code, articles, and snippets into clean GitHub-flavored Markdown text.

HTML to Plain Text Converter

Extract plain readable text from HTML documents by stripping all tags, scripts, and styling.

Number to Words Converter

Convert numbers and monetary figures into English words with currency formatting (USD, EUR, INR, GBP).

Roman Numeral Converter

Convert Arabic numbers (1-3999) to Roman numerals (I, V, X, L, C, D, M) and vice-versa in real-time.

Base32 Encoder & Decoder

Encode and decode Base32 strings according to RFC 4648 standard. Used in 2FA TOTP secrets and DNSSEC.

Base58 Encoder & Decoder

Encode and decode strings in Base58 format (Bitcoin alphabet). Safe encoding without ambiguous 0, O, I, l characters.

JSON to TypeScript Interface Generator

Convert JSON objects into strongly-typed TypeScript interfaces and type definitions instantly in your browser.

JSON to Go Struct Generator

Convert JSON data into clean Go (Golang) struct definitions with accurate json tags and PascalCase naming conventions.

JSON to Dart / Flutter Class Generator

Generate Dart model classes with fromJson() and toJson() serialization methods from sample JSON payloads.

CSV to TSV & TSV to CSV Converter

Convert comma-separated values (CSV) into tab-separated values (TSV) and vice versa with quote handling and line break preservation.

SQL Insert / DDL to JSON Converter

Convert SQL INSERT statements and table schemas into clean JSON arrays and objects. In-browser SQL dump parser with one-click export.

HTML Table to CSV / Excel Data Converter

Extract data from HTML `<table>` tags and convert into clean CSV or TSV format for Excel and Google Sheets with one-click export.

Base85 / Ascii85 Encoder & Decoder

Encode and decode strings using Ascii85 (Base85) binary-to-text encoding. Supports standard Adobe Ascii85 and IPv6 btoa format.

Punycode (IDN Domain Name) Encoder & Decoder

Convert internationalized domain names (IDN) with Unicode characters to Punycode (`xn--...`) and back. Essential for DNS and SSL configurations.

Deflate / Gzip / Zlib String & File Decompressor

Decompress Gzip, Deflate, and Zlib compressed strings and files in your browser. Powered by native DecompressionStream API with zero server uploads.

Live Currency Converter

Convert global currencies in real-time with live exchange rates, fee markup calculator, and reverse rate comparisons.

Merge PDF Files Online

PDF Tools

Combine multiple PDF documents into a single unified PDF file directly in your browser. 100% secure, private, and free with zero server uploads.

Split PDF Pages Online

PDF Tools

Split any PDF document or extract specific page ranges (e.g. 1-3, 5, 8-10) directly in your browser with complete privacy and zero data uploads.

PDF Compressor Online

Compress and reduce PDF document size directly in your browser with zero server uploads and maximum privacy.

Length & Distance Converter

Convert between metric and imperial length units — Millimeters, Centimeters, Meters, Kilometers, Inches, Feet, Yards, and Miles.

Weight & Mass Converter

Convert weight and mass units accurately — Kilograms (kg), Pounds (lbs), Grams (g), Ounces (oz), Metric Tons, and Stones.

Data Storage Converter

Convert digital storage units between Bits, Bytes, Kilobytes (KB), Megabytes (MB), Gigabytes (GB), and Terabytes (TB). Supports Decimal (1000) & Binary (1024).

Temperature Converter

Convert temperatures instantly between Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) with step-by-step conversion formulas.

Area & Land Converter

Convert land and area measurements between Square Meters, Acres, Hectares, Square Feet, Square Yards, and Square Kilometers.

Volume & Liquid Converter

Convert liquid and dry volume units between Liters, US Gallons, UK Gallons, Milliliters, Fluid Ounces, Quarts, Pints, and Cubic Meters.

Speed & Velocity Converter

Convert velocity units between Kilometers per hour (km/h), Miles per hour (mph), Meters per second (m/s), Knots, and Mach.

Pressure Converter

Convert pressure units between PSI, Bar, Pascal (Pa), Kilopascal (kPa), Standard Atmospheres (atm), and Torr / mmHg.

Energy & Work Converter

Convert energy between Joules (J), Kilojoules (kJ), Calories (cal), Kilocalories (kcal), Kilowatt-hours (kWh), and British Thermal Units (BTU).

Power Converter

Convert power units between Watts (W), Kilowatts (kW), Megawatts (MW), Mechanical Horsepower (hp), and Metric Horsepower (PS).

Bandwidth & Internet Speed Converter

Convert internet speeds between Megabits per second (Mbps), Megabytes per second (MB/s), Gigabits (Gbps), and Kilobits (Kbps).

Time Duration Converter

Convert time durations between Milliseconds, Seconds, Minutes, Hours, Days, Weeks, Months, and Years.

Angle Converter

Convert angular units between Degrees (°), Radians (rad), Gradians (grad), Arcminutes ('), and Arcseconds ('').

Force Converter

Convert physical force units between Newtons (N), Kilonewtons (kN), Dynes (dyn), Pound-force (lbf), and Kilogram-force (kgf).

Torque Converter

Convert rotational torque between Newton-meters (Nm), Foot-pounds (lb-ft), Inch-pounds (lb-in), and Kilogram-meters (kg-m).

Cooking & Recipe Unit Converter

Convert recipe measurements between Cups, Tablespoons, Teaspoons, Grams, Ounces, and Milliliters with ingredient density support.

Shoe Size Converter (US, UK, EU, CM, Inches)

Convert shoe sizes across US Men, US Women, UK, European (EU), Foot Length in Centimeters (CM) and Inches.

Paper Size Dimensions Guide & Converter

Look up exact dimensions for standard paper formats: ISO A-series (A4, A3, A5), B-series, US Letter, Legal, and Tabloid in millimeters, inches, and pixels.

Pixels to Inches, CM & DPI Calculator

Convert screen pixels to physical dimensions (Inches, Centimeters, Millimeters, Points) at any DPI/PPI resolution (72, 96, 150, 300 DPI).

Frequency Converter

Convert frequency and rotational speed units between Hertz (Hz), Kilohertz (kHz), Megahertz (MHz), Gigahertz (GHz), and Revolutions per minute (RPM).

Fuel Consumption Converter

Convert vehicle fuel economy and gas mileage between US MPG, Imperial UK MPG, Liters per 100km (L/100km), and Kilometers per Liter (km/L).

Electric Current Converter

Convert electrical current between Ampere (A), Milliampere (mA), Microampere (µA), Kiloampere (kA), Abampere (Bi), and Statampere with instant precision.

Density Converter

Convert material and liquid density between kilograms per cubic meter (kg/m³), grams per cubic centimeter (g/cm³), pounds per cubic foot (lb/ft³), and pounds per gallon.

Volumetric Flow Rate Converter