Documentation

Features

• ✓ Step-by-step solutions with clear explanations
• ✓ Supports math, physics, chemistry, engineering, and logic problems
• ✓ Multimodal: upload images of handwritten problems or textbook screenshots
• ✓ Powered by Google Gemini AI
• ✓ Renders LaTeX/KaTeX for mathematical notation
• ✓ Conversation history within a session

How to Use

1. 1 Navigate to the AI Solver page.
2. 2 Type your question or problem in the input box (e.g., "Solve x² + 5x + 6 = 0").
3. 3 Optionally, click the image icon to upload a photo of a problem.
4. 4 Press Enter or click Send.
5. 5 Read the step-by-step solution rendered with formatted math.
6. 6 Ask follow-up questions in the same session for deeper understanding.

Features

• ✓ Beautify minified JSON with customizable indentation
• ✓ Validate JSON structure and highlight syntax errors with line numbers
• ✓ One-click minify for production payloads
• ✓ Copy formatted output to clipboard

How to Use

1. 1 Paste your JSON into the input area.
2. 2 Click "Format" to beautify or "Minify" to compress.
3. 3 If there are errors, the validator highlights the exact line and character.
4. 4 Click "Copy" to copy the result to your clipboard.

Features

• ✓ Beautify dense XML strings into readable format
• ✓ Validate XML structure and report errors
• ✓ Minify XML for compact transmission
• ✓ Copy output to clipboard

How to Use

1. 1 Paste your XML into the input area.
2. 2 Click "Format" to beautify or "Minify" to compress.
3. 3 Review any validation errors shown below the input.
4. 4 Click "Copy" to copy the formatted output.

Features

• ✓ Instant encode and decode in real-time
• ✓ Supports UTF-8 text input
• ✓ One-click copy to clipboard
• ✓ Clean, distraction-free interface

How to Use

1. 1 Select the mode: "Encode" or "Decode".
2. 2 Paste or type your text in the input field.
3. 3 The result appears instantly in the output field.
4. 4 Click "Copy" to copy the result.

Features

• ✓ Decodes header and payload sections
• ✓ Shows all standard claims (iss, sub, aud, exp, iat, etc.)
• ✓ Displays expiration status (expired/valid) with human-readable time
• ✓ Syntax-highlighted JSON output
• ✓ Token never sent to any server

How to Use

1. 1 Paste your full JWT (e.g., eyJhbGciOi...) into the input field.
2. 2 The decoded header and payload appear instantly.
3. 3 Review claims, expiration time, and algorithm used.
4. 4 Check the expiration status indicator to see if the token is still valid.

Features

• ✓ Supports SHA-1, SHA-256, SHA-384, SHA-512
• ✓ Uses the native Web Crypto API (no external libraries)
• ✓ Instant hash generation as you type
• ✓ One-click copy for each hash value

How to Use

1. 1 Type or paste your text into the input field.
2. 2 All supported hashes are generated simultaneously in real-time.
3. 3 Click the copy icon next to any hash value to copy it.

Features

• ✓ Bidirectional conversion: HEX ↔ RGB ↔ HSL
• ✓ Live color preview swatch
• ✓ Accepts shorthand HEX (e.g., #FFF)
• ✓ Copy any format to clipboard

How to Use

1. 1 Enter a color value in any supported format (HEX, RGB, or HSL).
2. 2 The other two formats are computed and displayed instantly.
3. 3 View the live color preview swatch.
4. 4 Click "Copy" next to any format to use it in your CSS.

Features

• ✓ Input in any base, see all four bases at once
• ✓ Supports large numbers
• ✓ Real-time conversion as you type
• ✓ Copy any result to clipboard

How to Use

1. 1 Select the input base (decimal, binary, octal, or hex).
2. 2 Type your number in the input field.
3. 3 All other base representations update in real-time.
4. 4 Click "Copy" next to any output to copy it.

Features

• ✓ Real-time match highlighting in the test string
• ✓ Supports all regex flags: global, case-insensitive, multiline, dotAll
• ✓ Displays all matches with their index positions
• ✓ Shows named and numbered capture groups
• ✓ Quick-reference cheat sheet

How to Use

1. 1 Enter your regex pattern in the pattern field.
2. 2 Set flags (g, i, m, s) as needed.
3. 3 Paste or type your test string in the text area.
4. 4 Matches are highlighted in real-time.
5. 5 Review capture groups in the results panel below.

Features

• ✓ Timestamp → Date and Date → Timestamp conversion
• ✓ Shows both UTC and local timezone
• ✓ Relative time display (e.g., "2 days ago")
• ✓ Live "current timestamp" clock
• ✓ Supports seconds and milliseconds

How to Use

1. 1 Enter a Unix timestamp (seconds or milliseconds) in the input field.
2. 2 The human-readable date, UTC time, and relative time are shown instantly.
3. 3 Or, select a date/time from the date picker to get its Unix timestamp.
4. 4 Click "Copy" to copy the result.

Features

• ✓ Supports HTML, CSS, and JavaScript minification
• ✓ Shows original vs. minified size and savings percentage
• ✓ One-click copy to clipboard
• ✓ Runs entirely in the browser

How to Use

1. 1 Select the code type: HTML, CSS, or JavaScript.
2. 2 Paste your code into the input area.
3. 3 Click "Minify" to generate the compressed output.
4. 4 Review the file size savings shown above the output.
5. 5 Click "Copy" to copy the minified code.

Features

• ✓ Full GitHub Flavored Markdown (GFM) support
• ✓ Live preview of rendered HTML
• ✓ Copy raw HTML output
• ✓ Supports tables, code blocks, task lists, and more

How to Use

1. 1 Type or paste your Markdown into the input area.
2. 2 The rendered HTML preview updates in real-time.
3. 3 Switch to the "HTML" tab to see the raw HTML source.
4. 4 Click "Copy HTML" to copy the generated code.

Features

• ✓ Converts any text to URL-safe slugs
• ✓ Removes special characters and diacritics
• ✓ Customizable separator (hyphen or underscore)
• ✓ One-click copy to clipboard

How to Use

1. 1 Type or paste your text (e.g., a blog post title) into the input.
2. 2 The slug is generated instantly below.
3. 3 Optionally change the separator character.
4. 4 Click "Copy" to copy the slug.

Features

• ✓ Cryptographically secure using crypto.randomUUID()
• ✓ Bulk generate up to 100 UUIDs at once
• ✓ Copy individual or all UUIDs
• ✓ Uppercase/lowercase toggle

How to Use

1. 1 Click "Generate" to create a new UUID.
2. 2 Set the quantity (1–100) for bulk generation.
3. 3 Click "Copy" next to any UUID, or "Copy All" for the full list.
4. 4 Toggle uppercase if needed.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Fast and reliable processing
• ✓ Works entirely in your browser
• ✓ One-click copy to clipboard

How to Use

1. 1 Paste your input into the left pane.
2. 2 View the generated result in the right pane.
3. 3 Click "Copy" to copy the result.

Features

• ✓ Merge unlimited PDF files
• ✓ Drag-and-drop reordering
• ✓ Preview file order before merging
• ✓ Download merged PDF instantly

How to Use

1. 1 Click "Choose Files" or drag and drop your PDF files.
2. 2 Reorder files by dragging them into the desired sequence.
3. 3 Click "Merge PDFs".
4. 4 Download the combined PDF file.

Features

• ✓ Specify start and end page numbers
• ✓ Preview page count before splitting
• ✓ Fast client-side processing
• ✓ Download extracted pages as a new PDF

How to Use

1. 1 Upload your PDF file.
2. 2 Enter the start page and end page numbers.
3. 3 Click "Split PDF".
4. 4 Download the extracted pages.

Features

• ✓ Splits every page into its own PDF
• ✓ Download individual pages or all at once
• ✓ Works with large multi-page documents
• ✓ No file size limits (client-side)

How to Use

1. 1 Upload your PDF file.
2. 2 Click "Split All Pages".
3. 3 Download individual page PDFs or click "Download All".

Features

• ✓ Rich text editor with formatting options
• ✓ Customizable page size and margins
• ✓ Add multiple pages
• ✓ Download as PDF instantly

How to Use

1. 1 Type or paste your content into the editor.
2. 2 Apply formatting (bold, italic, headings) as needed.
3. 3 Click "Generate PDF".
4. 4 Download your newly created PDF.

Features

• ✓ Set owner and user passwords
• ✓ Control print, copy, and edit permissions
• ✓ AES encryption
• ✓ Preview permissions before applying

How to Use

1. 1 Upload your PDF file.
2. 2 Enter a password in the password field.
3. 3 Select permissions (allow/disallow printing, copying, etc.).
4. 4 Click "Protect PDF".
5. 5 Download the password-protected file.

Features

• ✓ Remove password protection from PDFs
• ✓ Requires the current password to unlock
• ✓ Produces an unprotected PDF for easy sharing
• ✓ Client-side decryption — password stays private

How to Use

1. 1 Upload your password-protected PDF.
2. 2 Enter the current password.
3. 3 Click "Remove Password".
4. 4 Download the unlocked PDF.

Features

• ✓ Flattens interactive form fields
• ✓ Bakes annotations into the page content
• ✓ Ensures consistent display across all PDF viewers
• ✓ Client-side processing

How to Use

1. 1 Upload your PDF with form fields or annotations.
2. 2 Click "Flatten PDF".
3. 3 Download the flattened version.

Features

• ✓ Shows page count, dimensions, and orientation
• ✓ Displays metadata (title, author, creator, dates)
• ✓ Reports PDF version
• ✓ Non-destructive inspection

How to Use

1. 1 Upload your PDF file.
2. 2 Review the metadata, page dimensions, and structure report.
3. 3 Use the information for pre-print checks or debugging.

Features

• ✓ Extracts text from all pages
• ✓ Preserves paragraph structure
• ✓ Copy extracted text to clipboard
• ✓ Download as .txt file

How to Use

1. 1 Upload your PDF file.
2. 2 The extracted text appears in the output area.
3. 3 Click "Copy" to copy the text or "Download" to save as .txt.

Features

• ✓ Converts every page to PNG
• ✓ Adjustable resolution/quality
• ✓ Download individual images or all at once
• ✓ Client-side rendering

How to Use

1. 1 Upload your PDF file.
2. 2 Set the desired image quality/resolution.
3. 3 Click "Convert".
4. 4 Download individual page images or click "Download All".

Features

• ✓ Converts PDF text content to HTML structure
• ✓ Live preview in the browser
• ✓ Download the HTML file
• ✓ Client-side conversion

How to Use

1. 1 Upload your PDF file.
2. 2 Preview the converted HTML output in the browser.
3. 3 Click "Download HTML" to save the file.

Features

• ✓ Supports JPG, PNG, and WebP formats
• ✓ Drag-and-drop reordering
• ✓ Customizable page size (A4, Letter, etc.)
• ✓ Preview images before converting

How to Use

1. 1 Click "Choose Files" or drag and drop your images.
2. 2 Reorder images by dragging them.
3. 3 Select a page size if needed.
4. 4 Click "Create PDF".
5. 5 Download the combined PDF.

Features

• ✓ Counts words, characters (with/without spaces), sentences, and paragraphs
• ✓ Estimated reading and speaking time
• ✓ Top keyword density analysis
• ✓ Works in real-time as you type

How to Use

1. 1 Type or paste your text into the input area.
2. 2 All statistics update in real-time above the input.
3. 3 Scroll down to see keyword density analysis.

Features

• ✓ Bidirectional translation: Text ↔ Morse code
• ✓ Audio playback of Morse code with adjustable WPM speed
• ✓ Visual dot/dash display
• ✓ Copy Morse code output to clipboard

How to Use

1. 1 Select the mode: "Text to Morse" or "Morse to Text".
2. 2 Type or paste your input.
3. 3 The translation appears instantly.
4. 4 Click the play button to hear the Morse code audio.
5. 5 Adjust playback speed with the WPM slider.

Features

• ✓ Two encoding modes: encodeURIComponent and encodeURI
• ✓ Real-time encoding/decoding
• ✓ Handles special characters, Unicode, and emoji
• ✓ One-click copy to clipboard

How to Use

1. 1 Select the mode: "Encode" or "Decode".
2. 2 Choose the encoding function (encodeURIComponent or encodeURI).
3. 3 Paste or type your text.
4. 4 The result updates in real-time.
5. 5 Click "Copy" to copy the output.

Features

• ✓ Supports 8+ case conversions
• ✓ One-click conversion buttons
• ✓ Character and word count display
• ✓ Copy result to clipboard

How to Use

1. 1 Paste or type your text in the input area.
2. 2 Click the desired case button (e.g., "UPPER", "lower", "Title Case").
3. 3 The converted text appears in the output.
4. 4 Click "Copy" to copy the result.

Features

• ✓ Generate by paragraphs, sentences, or words
• ✓ Customizable quantity
• ✓ Starts with "Lorem ipsum dolor sit amet…"
• ✓ One-click copy to clipboard

How to Use

1. 1 Select the unit: Paragraphs, Sentences, or Words.
2. 2 Set the desired quantity.
3. 3 Click "Generate".
4. 4 Copy the generated text to your clipboard.

Features

• ✓ Handles large numbers (up to trillions and beyond)
• ✓ Supports decimal numbers
• ✓ Proper English grammar (commas, "and" placement)
• ✓ Copy result to clipboard

How to Use

1. 1 Type a number into the input field.
2. 2 The English word representation appears instantly.
3. 3 Click "Copy" to copy the text.

Features

• ✓ Trig functions: sin, cos, tan and inverses
• ✓ Logarithms: log, ln
• ✓ Constants: π, e
• ✓ Expression history
• ✓ Keyboard input support

How to Use

1. 1 Enter a mathematical expression using the buttons or your keyboard.
2. 2 Use function buttons (sin, cos, log, etc.) for advanced operations.
3. 3 Press "=" or Enter to evaluate.
4. 4 View previous calculations in the history panel.

Features

• ✓ Finds both real and complex roots
• ✓ Step-by-step discriminant calculation
• ✓ Shows the vertex and axis of symmetry
• ✓ Handles edge cases (a=0, discriminant<0)

How to Use

1. 1 Enter the coefficients a, b, and c.
2. 2 Click "Solve".
3. 3 View the roots (x₁ and x₂), discriminant, and solution steps.

Features

• ✓ Supports matrices up to 10×10
• ✓ Operations: add, subtract, multiply, transpose, determinant, inverse
• ✓ Adjustable matrix dimensions
• ✓ Clear and reset buttons

How to Use

1. 1 Set the matrix dimensions (rows × columns).
2. 2 Enter values into the matrix cells.
3. 3 Select an operation from the toolbar.
4. 4 For binary operations (add, multiply), fill in the second matrix.
5. 5 Click "Calculate" and view the result matrix.

Features

• ✓ Calendar-exact calculation accounting for leap years and variable month lengths
• ✓ Optional "As of Date" to determine age on any past or future date
• ✓ Next birthday countdown showing days remaining and milestone age
• ✓ Lifetime breakdown cards: total days, months, weeks, hours, and minutes
• ✓ Save results to local dashboard

How to Use

1. 1 Select your date of birth.
2. 2 Optionally select an "as of" target date (defaults to today).
3. 3 Click "Calculate Age".
4. 4 View your exact age in years, months, and days, plus your complete lifetime breakdown.

Features

• ✓ Three interactive modes with clean tabbed switcher
• ✓ Mode 1: "What is X% of Y?" for sales tax, discounts, and fractions
• ✓ Mode 2: "X is what percent of Y?" for grades, ratios, and distributions
• ✓ Mode 3: "% Increase/Decrease" with direction badge and absolute difference
• ✓ One-click copy-to-clipboard for every result
• ✓ Save results to local dashboard

How to Use

1. 1 Select a mode tab matching your question.
2. 2 Enter your input values.
3. 3 Results compute instantly as you type.
4. 4 Click "Copy Result" or "Save Result" as needed.

Features

• ✓ Calculates mean, median, mode, range, min, max
• ✓ Standard deviation and variance (population & sample)
• ✓ Accepts comma-separated or space-separated input
• ✓ Instant results

How to Use

1. 1 Enter your data values separated by commas or spaces.
2. 2 Click "Calculate".
3. 3 View all statistical measures in the results panel.

Features

• ✓ Supports 8+ unit categories
• ✓ Bidirectional conversion
• ✓ Common and scientific units
• ✓ Real-time conversion as you type

How to Use

1. 1 Select a category (e.g., Length, Weight, Temperature).
2. 2 Choose the "from" and "to" units.
3. 3 Enter the value to convert.
4. 4 The converted value appears instantly.

Features

• ✓ Supports 2D shapes: circle, rectangle, triangle, trapezoid
• ✓ Supports 3D shapes: sphere, cylinder, cone, cube
• ✓ Calculates area, perimeter, volume, surface area
• ✓ Visual shape indicators

How to Use

1. 1 Select a shape from the dropdown.
2. 2 Enter the required dimensions (e.g., radius, width, height).
3. 3 Click "Calculate".
4. 4 View all computed properties (area, perimeter, volume, etc.).

Features

• ✓ Set custom min/max range
• ✓ Generate multiple random numbers at once
• ✓ Support for decimal/integer mode
• ✓ Customizable output separator
• ✓ Copy results to clipboard

How to Use

1. 1 Set the minimum and maximum values.
2. 2 Choose how many random numbers to generate.
3. 3 Select integer or decimal mode.
4. 4 Click "Generate".
5. 5 Copy the results to clipboard.

Features

• ✓ Real-time conversion across 160+ world currencies
• ✓ Mid-market reference rates from 84 official central banks (ECB, Fed, BOE)
• ✓ Multi-currency rate board comparing base against 7 major currencies
• ✓ Historical rate lookup dating back to 1999
• ✓ Quick preset buttons for common amounts ($1, $10, $100, $500, $1000)
• ✓ 100% free with zero mark-up, spread, or registration

How to Use

1. 1 Enter the amount you want to convert.
2. 2 Select your "From" base currency and "To" target currency.
3. 3 View the converted total and mid-market exchange rate instantly.
4. 4 Click the swap button (⇄) to invert currencies.
5. 5 Use the Multi-Currency Board to compare your base currency against other global currencies.
6. 6 Use Historical Rate Lookup to view official exchange rates on a specific past date.

Features

• ✓ Synced range slider and number input for tip percentage (0%–50%)
• ✓ Quick preset buttons for 10%, 15%, 18%, 20%, and 25%
• ✓ Group bill splitting with per-person total calculation
• ✓ Round up total to nearest whole dollar with auto-adjusted tip
• ✓ Live calculation on every keystroke or slider drag
• ✓ Save results to local dashboard

How to Use

1. 1 Enter the pre-tip bill subtotal.
2. 2 Select or drag your desired tip percentage.
3. 3 Specify the number of people to divide the check evenly.
4. 4 Optionally check "Round up total" for a clean whole dollar bill.
5. 5 View tip amount, total bill, and per-person cost.

Features

• ✓ Interactive growth chart
• ✓ Annual breakdown table
• ✓ Supports monthly/quarterly/annual compounding
• ✓ Accounts for regular contributions
• ✓ Shows total interest earned vs. principal invested

How to Use

1. 1 Enter your initial investment (principal).
2. 2 Set the annual interest rate.
3. 3 Choose the compounding frequency (monthly, quarterly, annually).
4. 4 Enter any regular contribution amount and frequency.
5. 5 Set the investment duration in years.
6. 6 Review the growth chart and year-by-year breakdown.

Features

• ✓ Calculates interest, total amount, and breakdown
• ✓ Supports daily, monthly, and annual terms
• ✓ Clean, easy-to-read results
• ✓ Copy results to clipboard

How to Use

1. 1 Enter the principal amount.
2. 2 Set the annual interest rate.
3. 3 Enter the time period.
4. 4 View the calculated interest and total amount.

Features

• ✓ Calculates annual pre-tax cash flow
• ✓ Cash-on-cash return percentage
• ✓ Accounts for operating expenses and debt service
• ✓ Ideal for real estate investment analysis

How to Use

1. 1 Enter the property purchase price and down payment.
2. 2 Input the monthly rental income.
3. 3 Add operating expenses (property tax, insurance, maintenance, etc.).
4. 4 Enter mortgage payment details.
5. 5 Review the cash-on-cash return percentage.

Features

• ✓ Simple ROI percentage calculation
• ✓ Annualized ROI for time-adjusted comparison
• ✓ Net profit calculation
• ✓ Clean visual results

How to Use

1. 1 Enter the initial investment amount.
2. 2 Enter the final value or gain.
3. 3 Optionally enter the investment duration for annualized ROI.
4. 4 View the ROI percentage and net profit.

Features

• ✓ Monthly payment breakdown
• ✓ Amortization schedule
• ✓ Includes property tax and insurance estimates
• ✓ Total interest paid over the loan term

How to Use

1. 1 Enter the home price and down payment.
2. 2 Set the loan term (15, 20, or 30 years).
3. 3 Enter the annual interest rate.
4. 4 Optionally add property tax and insurance.
5. 5 View the monthly payment and amortization details.

Features

• ✓ Mifflin-St Jeor equation for high-accuracy BMR estimation
• ✓ Five activity levels from sedentary to extra active
• ✓ Metric and imperial unit support
• ✓ Daily calorie targets for weight loss (-500 cal), maintenance, and muscle gain (+500 cal)
• ✓ Save results to your local dashboard

How to Use

1. 1 Enter your age, gender, weight, and height.
2. 2 Select your typical weekly activity level.
3. 3 Click "Calculate TDEE".
4. 4 Review your BMR, TDEE, and recommended daily calorie targets.

Features

• ✓ Supports cm, feet + inches, and total inches with instant conversion
• ✓ Supports kilograms and pounds with real-time conversion
• ✓ Six WHO weight categories: Underweight, Healthy, Overweight, Obesity Class I, II, and III
• ✓ Interactive visual horizontal gauge with color-coded markers and animated pointer
• ✓ Optional age and sex inputs for context
• ✓ Save results to local dashboard

How to Use

1. 1 Select your preferred height unit (cm, ft+in, or in) and enter your height.
2. 2 Select your preferred weight unit (kg or lbs) and enter your weight.
3. 3 Optionally enter your age and sex.
4. 4 Click "Calculate BMI".
5. 5 View your BMI value, color-coded classification badge, and position on the visual gauge.

Features

• ✓ Official CDC 2000 BMI-for-age LMS dataset embedded for months 24–240
• ✓ High-precision Z-score and percentile calculation via standard normal CDF approximation
• ✓ Four pediatric categories: Underweight (<5th), Healthy (5th to <85th), Overweight (85th to <95th), and Obese (≥95th percentile)
• ✓ Contextual comparison sentence tailored to age and sex
• ✓ Visual percentile position gauge
• ✓ Metric and imperial input support

How to Use

1. 1 Enter your child's height (cm or ft+in) and weight (kg or lbs).
2. 2 Specify age in years (2–19) and months (0–11).
3. 3 Select the child's sex (Male or Female, required for CDC chart lookup).
4. 4 Click "Calculate BMI & Percentile".
5. 5 Review the calculated BMI, growth chart percentile, category badge, and contextual explanation.

Features

• ✓ Calculates volume in cubic yards and cubic meters
• ✓ Pre-mix bag count (40, 60, 80 lb bags)
• ✓ Supports slabs, footings, columns, and walls
• ✓ Accounts for waste factor

How to Use

1. 1 Select the shape type (slab, column, footing, etc.).
2. 2 Enter dimensions: length, width, and thickness/depth.
3. 3 Set the waste factor percentage (default: 10%).
4. 4 View the concrete volume and bag count.

Features

• ✓ NEC-compliant wire size recommendations
• ✓ Accounts for voltage drop over distance
• ✓ Supports copper and aluminum conductors
• ✓ Single-phase and three-phase circuits

How to Use

1. 1 Enter the circuit amperage.
2. 2 Set the one-way wire run distance.
3. 3 Choose conductor material (copper or aluminum).
4. 4 Set the acceptable voltage drop percentage.
5. 5 View the recommended wire gauge.

Features

• ✓ Calculates required number of panels
• ✓ Accounts for system losses and efficiency
• ✓ Adjustable peak sun hours
• ✓ Estimates annual energy production

How to Use

1. 1 Enter your daily energy consumption (kWh).
2. 2 Set the panel wattage (e.g., 400W).
3. 3 Enter the average peak sun hours for your location.
4. 4 View the recommended number of panels and system size.

Features

• ✓ Standard board feet formula (T×W×L / 144)
• ✓ Supports multiple board entries
• ✓ Total volume calculation
• ✓ Price estimation per board foot

How to Use

1. 1 Enter the board dimensions: thickness, width, and length.
2. 2 Set the number of boards.
3. 3 Optionally enter a price per board foot.
4. 4 View the total board feet and estimated cost.

Features

• ✓ Calculates total paintable area
• ✓ Subtracts doors and windows
• ✓ Adjustable coverage rate (sq ft per gallon)
• ✓ Accounts for multiple coats

How to Use

1. 1 Enter the room dimensions (length, width, height).
2. 2 Set the number of doors and windows to exclude.
3. 3 Choose the number of coats.
4. 4 View the total gallons needed.

Features

• ✓ Real-time traffic share and netflows monitoring
• ✓ Protocol adoption stats: IPv4 vs IPv6, HTTP/1.x, HTTP/2, HTTP/3, and TLS versions
• ✓ DDoS threat intelligence: L3 attack vectors, protocols, origin countries, and L7 mitigations
• ✓ Connection quality benchmarks: global download/upload medians, latency, and jitter
• ✓ Location-aware regional filtering with 24-hour cached entities list
• ✓ Recent internet disruptions and outage tracking

How to Use

1. 1 Navigate to the Internet Radar page.
2. 2 Use the sticky Region selector below the hero to choose Worldwide or select a specific country.
3. 3 Explore live traffic charts and protocol adoption distributions.
4. 4 Review the DDoS attack overview for current layer 3 and layer 7 attack vectors.
5. 5 Check global median bandwidth, latency, and compare your speeds with the Speed Test link.

Features

• ✓ Multi-stream adaptive download and upload testing
• ✓ Loaded and unloaded latency and jitter analysis
• ✓ Bufferbloat grading for streaming and gaming
• ✓ Zero intrusive ads or third-party tracking scripts

How to Use

1. 1 Open the Speed Test tool.
2. 2 Click "Start Test" to measure latency and ping.
3. 3 Wait as download and upload tests execute in real time.
4. 4 Review your final speeds, bufferbloat grade, and connection metrics.

Features

• ✓ Full CIDR notation support from /0 to /32
• ✓ Calculates subnet mask, wildcard mask, and broadcast address
• ✓ Displays first usable, last usable, and total usable hosts
• ✓ Binary representation of IP address and subnet mask

How to Use

1. 1 Enter an IPv4 address and select or type a CIDR prefix (e.g. 192.168.1.0/24).
2. 2 View the calculated network parameters instantly.
3. 3 Copy any network address, broadcast, or mask value with one click.

Features

• ✓ Instant public IP detection
• ✓ ISP, Autonomous System Number (ASN), and organization details
• ✓ City, region, country, and approximate coordinates
• ✓ One-click copy IP to clipboard

How to Use

1. 1 Visit the My IP page.
2. 2 Your public IP address and network details load automatically.
3. 3 Click the copy button to copy your IP to the clipboard.

Features

• ✓ Lookup any public IPv4 or IPv6 address
• ✓ Displays country, region, city, postal code, and coordinates
• ✓ ISP, ASN, and hosting provider identification
• ✓ Clean tabular layout with one-click copy

How to Use

1. 1 Enter a public IP address into the search input.
2. 2 Click "Lookup IP" or press Enter.
3. 3 Inspect the geolocation, ISP, and network routing specifications.

Features

• ✓ Adjustable password length (8–128 characters)
• ✓ Toggle uppercase, lowercase, numbers, and symbols
• ✓ Visual password strength meter
• ✓ Exclude ambiguous characters option
• ✓ Generate multiple passwords at once
• ✓ One-click copy to clipboard

How to Use

1. 1 Set the desired password length using the slider.
2. 2 Toggle character sets: uppercase, lowercase, numbers, symbols.
3. 3 Click "Generate" for a new password.
4. 4 Review the strength indicator (Weak → Very Strong).
5. 5 Click "Copy" to copy the password.

Features

• ✓ Supports URL, text, email, phone, WiFi, and vCard
• ✓ Customizable foreground and background colors
• ✓ Adjustable QR code size
• ✓ Download as PNG image
• ✓ Real-time preview

How to Use

1. 1 Select the QR code type (URL, Text, WiFi, etc.).
2. 2 Enter the content (e.g., a URL or WiFi password).
3. 3 Customize colors and size if desired.
4. 4 Preview the QR code in real-time.
5. 5 Click "Download PNG" to save the image.