JSON Formatter
Format, validate, and minify JSON online with this free JSON formatter. Make compact JSON easier to read, choose your indentation style, sort object keys, and download the result.
Tool library
All tools
Browse 50 practical tools, organized by the task you need to complete.
Developer Tools
Utilities for formatting, checking, converting, and inspecting development data.
JSON Validator
Check whether your JSON is correctly formatted and ready to use. Paste your data, enter it manually, or upload a .json file to detect syntax errors. You can also provide a JSON Schema to check whether your data follows common structural and value rules.
JSON Minifier
Minify JSON online by removing unnecessary formatting whitespace. Make JSON text more compact, check its syntax before minifying, and optionally sort object keys. View the size reduction, then copy or download the result.
JSON ↔ CSV Converter
Choose a delimiter, work with column headers, flatten nested JSON objects, and preview your data before copying or downloading the result.
JSON ↔ YAML Converter
Convert JSON to YAML or YAML to JSON with an online converter. Validate your input, identify parsing errors, adjust indentation and formatting, sort mapping keys, and copy or download the converted result.
Base64 Encoder / Decoder
Encode text and files to Base64 or decode Base64 data back into readable text or downloadable files. This online Base64 encoder and decoder supports UTF-8 text, URL-safe Base64, optional padding removal, and configurable output line wrapping.
URL Encoder / Decoder
Encode or decode text, URL components, and form values with this free online URL Encoder / Decoder. You can also parse query parameters, edit parameter values, and build an updated URL. Convert text as you type or manually, then copy or download the result.
HTML Encoder / Decoder
Convert special characters into HTML entities or decode HTML entities back into readable text. Encode or decode manually or as you type, preserve existing entities, convert non-ASCII characters, and process nested entities with up to five decoding passes.
UUID Generator
Generate random UUID v4 identifiers suitable for unique keys, test records, and identifiers.
JWT Encoder/Decoder
Decode JWTs, inspect claims, verify HMAC signatures, and generate signed test tokens with HS256, HS384, or HS512.
Regex Tester
Test and debug JavaScript regular expressions. Highlight live matches, inspect capture groups and positions, and preview JavaScript replacements.
Timestamp Converter
Convert Unix timestamps into readable dates, or convert a date and time into a Unix timestamp. This free online Unix Timestamp Converter supports seconds and milliseconds, displays UTC and selected-timezone results, and updates automatically as you change the input.
Calculators
Clear calculators for percentages, finance, dates, and everyday decisions.
Percentage Calculator
Calculate percentages, percentage changes, increases, and decreases with six live calculators that show the formula for each result.
Discount Calculator
Calculate the final price of an item after discounts, coupons, and sales tax. Enter the original price and quantity, choose a percentage or fixed-amount discount, and optionally apply an additional coupon.
Profit Margin Calculator
Calculate your profit margin, markup, and profit per item with this free Profit Margin Calculator. Enter your product cost and selling price to see how much profit you make on each sale and how your results change with additional costs and different quantities.
ROI Calculator
Calculate return on investment, net profit or loss, total return percentage, and estimated annualized ROI.
Simple Interest Calculator
Calculate simple interest and the final amount using your principal, annual interest rate, and time period. Choose a duration in years, months, or days, select a currency, and see your results update as you change the inputs.
Compound Interest Calculator
Estimate how your savings or investments may grow over time with compound interest. Enter an initial deposit, annual interest rate, and investment period. You can also add recurring contributions and choose how often they are made and how frequently interest compounds.
Loan / EMI Calculator
Calculate your estimated monthly loan payment, total interest, and repayment time with this free Loan EMI Calculator. Enter your loan amount, annual interest rate, and repayment term to see how much you may need to pay each month.
Age Calculator
Calculate your age in years, months, and days from your date of birth, or find your age on any past or future date.
Date Difference Calculator
Find out how much time separates two dates with this free Date Difference Calculator. Choose a start date and an end date to calculate the difference in calendar years, months, and days, as well as total days, weeks, business days, weekend days, and hours.
Tip Calculator
Use this free Tip Calculator to work out how much to leave as a tip and how to divide a bill between a group. Enter the bill subtotal, choose a suggested tip percentage or enter your own, and optionally include sales tax.
Converters
Practical unit converters for length, temperature, storage, time, and more.
Length Converter
Convert between meters, kilometers, feet, miles and other length units for travel, design, and measurement tasks.
Weight / Mass Converter
Convert mass measurements between metric and customary units with this online weight and mass converter. Enter a value, select the units, and see the converted result alongside equivalent values in the other supported units.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine with this free online Temperature Converter. Enter a value, choose the starting and target scales, and see the result update instantly. Compare equivalent values, switch units, adjust decimal precision, and copy the result when needed.
Area Converter
Convert area measurements between square meters, hectares, acres, square feet, and other common units with this free online Area Converter. Enter a value, select its unit, and see equivalent measurements update instantly. You can swap units, adjust decimal precision, compare equivalent values, and copy individual results.
Volume Converter
Convert volume measurements between metric, US customary, Imperial, and cubic units. Enter a value, choose the units, and see the converted result along with equivalent measurements in other supported units.
Speed Converter
Convert speed between meters per second, kilometers per hour, miles per hour, knots, and other common units with this free online Speed Converter. Enter a value, select the starting and target units, and see the result update instantly. Swap units, adjust decimal precision, and copy equivalent values for quick reference.
Time Converter
Convert time units online with this free Time Converter. Enter a duration and get its equivalent in other units, from nanoseconds and microseconds to days, weeks, average months, years, decades, and centuries.
Digital Storage Converter
Convert digital storage units online with this free Digital Storage Converter. Compare bits, bytes, decimal units such as KB and GB, and binary units such as KiB and GiB. Enter a value, choose a unit, and see its equivalents across all supported units.
Pressure Converter
Convert pressure units online with this free Pressure Converter. Change pascals, kilopascals, megapascals, hectopascals, millibars, bars, PSI, atmospheres, torr, millimetres of mercury, inches of mercury, and kilogram-force per square centimetre.
Energy Converter
Convert energy units online with this free Energy Converter. Change joules, kilojoules, megajoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, foot-pounds, and electronvolts. Enter a value, select a unit, and view its equivalents across all supported units.
Text Tools
Fast text utilities for counting, cleaning, comparing, sorting, and generating copy.
Word Counter
Count words, characters, sentences, and paragraphs, check reading and speaking time, and find frequently used keywords.
Character Counter
Count characters, words, letters, emoji, lines, and more with this free online Character Counter. Whether you are preparing a social media post, writing a short description, editing an article, or checking a text limit, this tool gives you a detailed breakdown of your text.
Case Converter
Change the capitalization and format of your text with this free online Case Converter. Convert text to uppercase, lowercase, title case, sentence case, and programming-friendly naming styles such as camelCase, PascalCase, snake_case, and kebab-case.
Remove Duplicate Lines
Remove duplicate lines from text online with this free tool. Paste a list, choose how lines should be compared, and generate a cleaned result. You can ignore surrounding spaces, ignore capitalization, keep the first or last occurrence, and decide how blank lines are handled.
Remove Extra Spaces
Clean up text by removing extra spaces, tabs, and blank lines with this free online tool. Choose one of five cleanup modes, adjust tab expansion where applicable, and decide whether line breaks should be preserved. Compare whitespace counts before and after, then copy or download the cleaned text as a TXT file.
Text Sorter
Sort text lists into a more useful order with this free online Text Sorter. Arrange one item per line alphabetically, numerically, or by line length. You can also reverse the current order without sorting the entries.
Text Diff Checker
Compare two versions of text line by line with this free online Text Diff Checker. Paste your original text into one panel and the revised version into the other. The tool identifies added, removed, and unchanged lines, then provides a summary so you can see what changed.
Lorem Ipsum Generator
Generate placeholder text for website layouts, wireframes, mockups, and design previews. Choose to generate text by paragraph, sentence, or word count, customize paragraph length, and select plain text or HTML output. You can also edit the generated text, check live text statistics, and copy or download the result.
Web & SEO Tools
Create web metadata, crawl files, sitemaps, and campaign URLs with transparent output.
Meta Tag Generator
Generate properly formatted HTML meta tags such as description, keywords and viewport for page metadata needs.
Open Graph Generator
Generate Open Graph meta tags for title, description, image and type to control social share previews.
Robots.txt Generator
Create a robots.txt file for your website with this free online generator. Choose which crawlers the rules apply to, add Allow and Disallow paths, include a sitemap URL, and optionally set a crawl delay. Preview the generated directives, copy the text, or download it as a robots.txt file.
Sitemap Generator
Generate an XML sitemap from page URLs with optional priority and change-frequency attributes for indexing guidance.
UTM URL Builder
Append standardized UTM parameters to links with source, medium, campaign and optional term values for tracking consistency.
Color Tools
Convert color values and check accessible contrast before you publish.
HEX to RGB Converter
Convert HEX colors to RGB and adjust hue, saturation, and lightness with a live color preview and synchronized color values.
HEX to HSL Converter
Convert HEX colors to HSL and edit hue, saturation, and lightness with live HEX, HSL, and RGB values.
Color Contrast Checker
Check color contrast ratios and WCAG 2.2 AA and AAA requirements for text, UI components, and graphics.
Generators
Create random values for practical digital tasks.
Password Generator
Generate a random password locally in your browser. Choose 4–256 characters, select character types, exclude look-alike characters, and review estimated strength.
Random String Generator
Generate random strings locally. Set 1–256 characters and 1–100 results, choose a character set, apply exclusions, then copy or download.