All Tools
Choose a free browser-based tool. Each page includes instructions, examples, FAQs, and related tools.
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.