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

Use fast, simple tools for common developer and SEO tasks: JSON formatting, URL encoding, case conversion, image resizing, calculators, and more.

Text & URL Converters

JSON to String

Convert JSON into an escaped string for logs, code, or configuration.

String to JSON

Unescape a string back into valid JSON.

JSON to Query String

Generate query string parameters from JSON key/value pairs.

Multiline to Single Line

Remove line breaks to create a single-line string.

Lowercase to UPPERCASE

Convert text to uppercase.

UPPERCASE to Lowercase

Convert text to lowercase.

Double Quotes to Single Quotes

Replace double quotes with single quotes.

Single Quotes to Double Quotes

Replace single quotes with double quotes.

URL Encoder / Decoder

Encode or decode URLs for safe web requests.

JSON Tools

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 Formatter & Validator

Format JSON for readability and validate syntax.

Developer Utilities

Lorem Ipsum Generator

Generate placeholder text for layouts and prototypes.

Password Generator

Create strong random passwords with customizable options.

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.

SEO Tools

SEO Meta Tag Generator

Generate title, description, keywords and social meta tags.

Calculators

Percentage Calculator

Calculate percentages quickly for marks, discounts, and changes.

Salary Hike Calculator

Estimate new salary after a hike percentage or amount.

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.

Health

BMI Calculator

Calculate Body Mass Index based on height and weight.

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.