Free Online Tools

Business Tools

Free tools for invoices, receipts, marketing links, QR codes, and business productivity.

Developer Tools

Free browser-based tools for formatting, validating, encoding, testing, and previewing code-related content.

Content And Image Tools

Free tools for writing, resizing images, and creating visual assets.

Finance Calculators

Free calculators for loans, interest, credit cards, taxes, tips, and payments.

Health Calculators

Free browser-based calculators for body metrics, metabolism estimates, and daily calorie planning.

Education Tools

Free tools for students, grades, GPA planning, and classroom calculations.

Math Calculators

Free calculators for everyday arithmetic, ratios, averages, random numbers, and quick math checks.

JSON Formatter

Format, beautify, and inspect JSON in your browser with a free online JSON formatter.

Invoice Generator

Create a simple printable invoice with line items, tax, totals, and client details.

QR Code Generator

Generate a QR code for text, links, contact details, or marketing campaigns.

Loan Calculator

Estimate monthly loan payments, total interest, and total repayment from principal, APR, and term.

Credit Card Payoff Calculator

Estimate how long it may take to pay off a credit card balance and how much interest you may pay.

JSON Validator

Check JSON syntax in your browser and see clear validation errors.

Regex Tester

Test JavaScript regular expressions against sample text and inspect matches.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to readable text in your browser.

Markdown Previewer

Write Markdown and preview the rendered result in your browser.

UTM Builder

Build URLs with UTM parameters for campaign tracking and analytics.

Receipt Generator

Create a printable receipt with seller, buyer, payment date, items, tax, and total.

Compound Interest Calculator

Estimate future value, total contributions, and growth from compound interest.

Auto Loan Calculator

Estimate auto loan payments from vehicle price, down payment, trade-in, fees, APR, and term.

Mortgage Extra Payment Calculator

Estimate how extra mortgage payments may reduce payoff time and interest cost.

Word Counter

Count words, characters, and estimated reading time from text in your browser.

Tip Calculator

Calculate tip amount, total bill, and per-person split from bill amount and tip percentage.

Sales Tax Calculator

Calculate sales tax and total price from a pre-tax amount and tax rate.

Meeting Cost Calculator

Estimate the cost of a meeting from attendee count, hourly rate, and duration.

Image Resizer

Resize PNG or JPEG images in your browser without uploading files.

Color Palette Generator

Generate complementary, analogous, triadic, and monochrome color palettes from a base color.

Case Converter

Convert text between uppercase, lowercase, title case, sentence case, camelCase, snake_case, and kebab-case.

Lorem Ipsum Generator

Generate lorem ipsum placeholder words, sentences, or paragraphs for design and content layouts.

Text Diff Checker

Compare two blocks of text and highlight added, removed, and unchanged lines in your browser.

CSV to JSON Converter

Convert CSV data with headers into formatted JSON arrays directly in your browser.

JSON to CSV Converter

Convert JSON arrays of objects into CSV with headers in your browser.

URL Encoder / Decoder

Encode text for URLs or decode percent-encoded URL strings in your browser.

HTML Entity Encoder / Decoder

Encode HTML special characters into entities or decode entities back to readable text.

Meta Tag Generator

Generate title, description, canonical, Open Graph, and Twitter Card meta tags for a web page.

Robots.txt Generator

Generate robots.txt rules with user agents, allow or disallow paths, and sitemap references.

Sitemap URL Extractor

Paste an XML sitemap and extract URL locations, counts, and duplicates in your browser.

Schema Markup Generator

Generate JSON-LD schema markup for articles, products, local businesses, FAQs, and breadcrumbs.

Favicon Generator

Generate favicon previews, icon sizes, and HTML link tags from text, emoji, colors, or an uploaded image.

Image Compressor

Compress JPG, PNG, or WebP images locally with quality and size controls.

Image Format Converter

Convert images between PNG, JPEG, and WebP formats locally in your browser.

PDF Merge

Merge multiple PDF files into a single downloadable PDF locally in your browser.

PDF Split

Split a PDF by page ranges and download extracted pages from your browser.

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files in your browser.

UUID Generator

Generate UUID v4 values, bulk UUID lists, and lowercase or uppercase output.

Unix Timestamp Converter

Convert Unix timestamps to readable dates and convert dates back to epoch seconds or milliseconds.

Code Minifier

Minify CSS, HTML, or simple JavaScript snippets locally and compare original and compressed size.

JWT Decoder

Decode JWT header and payload data locally in your browser without sending tokens to a server.

YAML JSON Converter

Convert YAML to JSON and JSON to YAML locally with validation and formatted output.

XML Formatter / Validator

Format XML, check parse errors, and inspect document statistics locally in your browser.

Cron Expression Parser

Parse cron expressions, explain schedule fields, and preview upcoming run times.

Color Contrast Checker

Check foreground and background color contrast ratios for WCAG AA and AAA targets.

PDF Compressor

Reduce PDF file size in your browser with practical optimization settings and clear size reporting.

PDF to Image Converter

Convert PDF pages to PNG or JPEG images locally in your browser.

Images to PDF Converter

Convert JPG, PNG, or WebP images into a downloadable PDF in your browser.

PDF Rotate

Rotate all pages or selected pages in a PDF locally and download the updated file.

PDF Page Reorder

Reorder PDF pages by sequence and download a rearranged PDF locally in your browser.

Password Generator

Generate strong random passwords locally with length, character set, and bulk output controls.

Percentage Calculator

Calculate percentages, percentage increases, decreases, and what percent one number is of another.

Discount Calculator

Calculate sale price, savings amount, and final total from original price and discount percent.

Age Calculator

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

Date Duration Calculator

Calculate days, weeks, months, and years between two dates with optional end-date inclusion.

Unit Converter

Convert length, weight, temperature, area, volume, and speed units locally in your browser.

SERP Snippet Preview

Preview how a page title, URL, and meta description may appear in Google search results.

On-Page SEO Analyzer

Analyze pasted HTML for title, meta description, headings, canonical links, images, and basic on-page SEO signals.

SVG to PNG Converter

Convert SVG markup or files to PNG locally with width, height, and background controls.

Text to Slug Converter

Convert titles or text into clean URL slugs with separator, lowercase, and character cleanup options.

BMI Calculator

Calculate body mass index from height and weight with metric and US units, category ranges, and healthy-weight estimates.

BMR Calculator

Estimate basal metabolic rate with Mifflin-St Jeor and Harris-Benedict formulas using age, sex, height, and weight.

Calorie Calculator

Estimate daily maintenance, weight-loss, and weight-gain calories from BMR, activity level, and goal.

GPA Calculator

Calculate weighted GPA from course grades and credits with editable course rows.

Grade Calculator

Calculate current weighted grade and the final exam score needed to reach a target grade.

Average Calculator

Calculate mean, median, mode, range, sum, count, minimum, and maximum from a list of numbers.

Ratio Calculator

Simplify ratios, scale ratios, compare equivalent ratios, and solve missing ratio values.

Random Number Generator

Generate random integers or decimals with min, max, quantity, uniqueness, sorting, and secure-random options.

Profit Margin Calculator

Calculate gross profit, profit margin, markup, selling price, and cost from business inputs.

ROI Calculator

Calculate ROI percentage, net return, total return, annualized ROI, and break-even value from investment inputs.

Time Zone Converter

Convert a date and time between common time zones with DST-aware browser calculations.

Keyword Density Checker

Analyze word count, keyword matches, keyword density, and top terms in browser.

JSON Diff Tool

Compare two JSON documents and list added, removed, changed, and unchanged paths locally.

Image Cropper

Crop PNG or JPEG images locally with aspect ratio presets and a downloadable preview.

HTTP Header Checker

Check HTTP status, response headers, cache headers, and common security headers for a public URL.