Free Online Tools: Converters, Calculators, SEO & Developer Utilities

130+ fast, simple browser-based tools for developers, writers, and SEO. JSON, YAML & XML formatters, text and case converters, encoders and hashing, color and CSS generators, markdown and diagram editors, QR codes, PDF and image utilities, network helpers, and everyday calculators — all in one place.

Text Tools

Lowercase to UPPERCASE

Convert text to uppercase.

UPPERCASE to Lowercase

Convert text to lowercase.

Case Converter (all cases)

Convert to camelCase, snake_case, kebab-case, PascalCase, and more.

Double Quotes to Single Quotes

Replace double quotes with single quotes.

Single Quotes to Double Quotes

Replace single quotes with double quotes.

Remove Duplicate Lines

Remove duplicate lines with trim, case, and sort options.

Sort Lines Alphabetically

Sort text lines A-Z, Z-A, numerically, or by length.

Text Reverse

Reverse text by character, word, or line.

Word Frequency Counter

Count how often each word appears for SEO and writing analysis.

Text Diff / Compare

Compare two blocks of text side-by-side with highlighted differences.

Find & Replace

Batch find and replace text with optional regex and case control.

Line Number Tool

Add or remove line numbers from any block of text.

Whitespace Remover

Trim spaces, collapse double spaces, and remove blank lines.

Multiline to Single Line

Join JSON, XML or code to one line with custom delimiters — or split back.

Slug to Title Converter

Convert URL slugs like my-blog-post into a readable title or heading.

Number to Words

Convert any number to English words in International or Indian (lakh/crore) format.

JSON, YAML & Data Tools

JSON Formatter & Validator

Format JSON for readability and validate syntax.

JSON Minifier

Compress JSON by removing whitespace and line breaks.

JSON to String

Escape JSON for Java, C#, Python or JavaScript with validate & pretty-print.

String to JSON

Unescape a string back into valid JSON.

Escape JSON String

Escape special characters for safe embedding in code or JSON.

Unescape JSON String

Convert escaped JSON text back to readable format.

JSON to Query String

Generate query string parameters from JSON key/value pairs.

JSON to CSV

Convert a JSON array of objects to CSV or TSV.

CSV to JSON

Parse CSV or TSV into a JSON array of objects.

JSON to YAML

Convert JSON to clean YAML for Kubernetes, CI/CD, and configs.

YAML to JSON

Parse YAML into JSON using js-yaml.

JSON to XML

Convert JSON to XML for SOAP and legacy integrations.

XML to JSON

Parse XML into JSON using the browser DOMParser.

XML Formatter & Validator

Format, minify, and validate XML documents.

JSON Diff

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

JSONPath Tester

Run JSONPath expressions against a JSON document and see results instantly.

JSON to TypeScript

Generate TypeScript interfaces from a JSON sample.

HTML Table to JSON

Extract an HTML table and convert it to a JSON array.

SQL Formatter

Format and beautify SQL queries for readability.

TOML to JSON

Parse TOML configuration files into JSON.

Encoding, Hashing & Security

URL Encoder / Decoder

Encode or decode URLs for safe web requests.

HTML Encoder / Decoder

Convert special characters to HTML entities and back.

Base64 Encoder / Decoder

Encode to Base64 or decode Base64 back to readable text.

Hash Generator (MD5 / SHA)

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes in your browser.

Bcrypt Generator & Verifier

Hash passwords with bcrypt and verify hashes in your browser.

JWT Decoder

Decode JSON Web Token header and payload safely in your browser.

Password Generator

Create strong random passwords with customizable options.

Password Strength Checker

Test your password's entropy, crack time, and character composition with detailed feedback.

UUID / GUID Generator

Generate random UUIDs (GUIDs) in multiple formats.

Markdown & Diagrams

Markdown Live Editor

Write Markdown with a real-time HTML preview, toolbar shortcuts, and copy or download output.

Markdown to HTML

Write Markdown and instantly preview the rendered HTML output.

HTML to Markdown

Convert HTML markup into clean Markdown for docs and wikis.

Markdown Table Generator

Build GitHub-flavored Markdown tables visually with adjustable rows, columns and alignment.

Word to HTML Converter

Paste text from Microsoft Word and get clean HTML without messy inline styles.

Mermaid Diagram Editor

Create flowcharts, sequence diagrams, Gantt charts, and more with Mermaid syntax — live preview.

Web & CSS

CSS Minifier

Minify or beautify CSS to reduce file size or improve readability.

JS Minifier

Strip comments and collapse whitespace in JavaScript files.

HTML Minifier

Remove comments and whitespace from HTML for faster page loads.

CSS Box Shadow Generator

Generate CSS box-shadow with live preview. Adjust offset, blur, spread and color.

CSS Gradient Generator

Create linear and radial CSS gradients visually and copy the ready-to-use CSS.

Regex Tester

Test regular expressions with live highlighting and capture groups.

HTTP Status Codes

Complete reference for all HTTP 1xx–5xx response codes.

Color Tools

Color Converter

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

Color Palette Generator

Generate tints, shades, complementary, and analogous color palettes.

HTML Color Picker

Pick colors and copy HEX, RGB, and HSL values with a color history.

Random Color Generator

Generate random HEX, RGB, and HSL colors with a full-screen preview and history.

Color Picker from Image

Upload any photo and click to extract exact HEX, RGB, and HSL color values from any pixel.

Date, Time & Numbers

Unix Timestamp Converter

Convert Unix epoch to readable dates and back.

Time Zone Converter

Convert a date and time between any two time zones worldwide.

Date Calculator

Find the difference between two dates or add/subtract days.

Number Base Converter

Convert between binary, octal, decimal, hex, and custom bases.

Cron Expression Parser

Explain cron schedules in plain English with next-run preview.

Generators & QR

Lorem Ipsum Generator

Generate placeholder text for layouts and prototypes.

Random Data Generator

Generate random names, emails, and addresses for testing and demos.

URL Slug Generator

Create SEO-friendly URL slugs from titles and text.

QR Code Generator

Generate QR codes for URLs and text. Download as PNG instantly.

QR Code Scanner

Decode QR codes from an uploaded image or live camera feed — 100% in your browser.

Favicon Generator

Generate favicons in all standard sizes from any image.

Image to Base64

Upload an image and get a Base64 data URL for HTML, CSS, and APIs.

Base64 to Image

Decode a Base64 string to preview and download the image.

Emoji Picker

Browse, search, and copy any emoji to clipboard in one click — organized by category.

PDF & Documents

PDF Merger

Combine multiple PDF files into one document — all in your browser, nothing uploaded.

PDF Splitter

Extract specific pages or ranges from any PDF — browser-based, no upload required.

PDF Compressor

Reduce PDF file size by re-saving with optimized structure — 100% in your browser.

PDF Editor

Edit text in any PDF online — click a paragraph, type to replace, and download. Free, no signup.

Invoice Generator

Create professional invoices with line items, tax, and discount — download as PDF instantly.

Resume Builder

Build a professional resume with experience, education, and skills — download as PDF.

Image Tools

Image Resizer

Resize images online while keeping quality and aspect ratio.

Convert Image to JPG

Convert common formats to JPG for easier sharing and upload.

Image Compressor

Compress images in your browser with a quality slider. No upload needed.

Image Format Converter

Convert images between PNG, JPEG, WebP, and BMP formats.

Image EXIF Viewer

Read EXIF metadata from photos: camera, GPS, date, and settings.

Crop Image Online

Upload an image, drag to select the crop area, choose aspect ratio, and download the result.

Add Watermark to Image

Add a custom text watermark with adjustable position, opacity, size, and color. Download instantly.

Meme Generator

Upload any image, add top and bottom text captions, and download your meme — no watermark.

PDF to JPG

Convert PDF pages to high-quality JPG images — all processing in your browser.

Image to Text (OCR)

Extract text from photos and images using AI-powered OCR — 30+ languages supported.

Remove Image Background

AI-powered background removal — get a transparent PNG instantly, no upload to server.

Network

CIDR Subnet Calculator

Calculate network, broadcast, host range and usable hosts from an IPv4 CIDR block.

What Is My IP Address

See your public IP address, location, country, city, and ISP instantly.

Fun & Novelty Converters

Text to Binary / Binary to Text

Convert text to ASCII binary code or decode binary back to readable text.

Morse Code Converter

Translate text to Morse code or decode Morse code back to plain text with audio.

Roman Numeral Converter

Convert numbers to Roman numerals (I, V, X…) or decode Roman numerals back to numbers.

Palindrome & Pangram Checker

Test if a word or phrase is a palindrome or a pangram — instantly.

SEO Tools

SEO Meta Tag Generator

Generate title, description, keywords and social meta tags.

Google SERP Preview

See how your page looks in Google search results before publishing.

Robots.txt Generator

Build a robots.txt file with a simple visual UI and download it.

Schema Markup Generator

Generate JSON-LD structured data for Article, FAQ, Product, and more.

Keyword Density Checker

Analyse keyword frequency and density in your content.

Readability Score

Measure reading ease with Flesch-Kincaid, Gunning Fog, and SMOG.

Sitemap Generator

Create an XML sitemap from a list of URLs and download it.

Link Extractor

Extract all links from HTML and resolve relative URLs to absolute.

Reading Time Estimator

Estimate reading time, speaking time, and page count for any block of text.

Open Graph / Social Preview

Preview how your page looks when shared on Facebook, Twitter/X, and LinkedIn.

Privacy Policy Generator

Generate a free GDPR-friendly Privacy Policy for your website or app. Download as HTML or TXT.

Terms & Conditions Generator

Create a professional Terms of Service agreement for your website or app. Download instantly.

Calculators

Percentage Calculator

Calculate percentages quickly for marks, discounts, and changes.

Salary Hike Calculator

Find hike %, new salary or CTC increase with monthly & annual breakdown.

Age Comparison Calculator

Compare ages and find age differences in years, months, and days.

Character Counter

Count characters for tweets, forms, and SEO limits.

Word Counter

Count words in text for articles, assignments, and SEO.

GST Calculator

Add or remove GST from a price. Shows CGST, SGST split.

Unit Converter

Convert temperature, length, weight, area, and volume units.

Discount Calculator

Calculate the sale price and savings for any discount percentage.

Tip Calculator

Calculate the tip and split the bill between multiple people.

ROI Calculator

Calculate return on investment, net profit, and CAGR for any period.

Currency Converter

Convert between 30+ currencies with live exchange rates. USD, EUR, GBP, INR and more.

Aspect Ratio Calculator

Find the missing dimension to maintain aspect ratio when scaling images or videos.

Number Formatter

Format numbers with comma separators — International (1,000,000) or Indian (10,00,000).

Stopwatch / Countdown Timer

Measure elapsed time with lap splits or count down from any duration with an alert.

Health

BMI Calculator

Calculate Body Mass Index based on height and weight.

Calorie Calculator

Calculate daily calorie needs using BMR and activity level.

Ideal Weight Calculator

Find your ideal body weight using Devine, Robinson, Miller, and Hamwi formulas.

Water Intake Calculator

Estimate daily water needs based on weight, activity level, and climate.

YouTube Tools

YouTube Live Subscriber Count

Track live subscriber count for a channel.

YouTube Random Comment Picker

Pick a random comment for giveaways and contests.

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