About CapyHelp

CapyHelp is a collection of small, focused web tools for everyday tasks: counting words, converting text, calculating percentages, generating secure passwords, and writing usernames, bios and hashtags for social media.

What we believe

• Tools should just work. Every button on this site does something. If a feature isn't ready, we don't show it.
• Your data is yours. The core tools run entirely in your browser. We don't need your text, and we don't ask for it.
• Honesty over hype. We don't publish fake reviews or invented statistics, and AI-powered features are always labeled.
• Free to use. The site may be supported by clearly labeled ads and affiliate recommendations, so the tools can stay free.

The tools

• Percentage Calculator — Find a percentage of a number, percentage change, and more — with the formula shown.
• Mortgage Calculator — Estimate your monthly home payment, total interest and a year-by-year balance.
• Loan Calculator — Monthly payment, total interest and payoff schedule for any fixed-rate loan.
• Compound Interest Calculator — See how savings grow with regular deposits and compounding over time.
• Savings Goal Calculator — See how long a savings goal will take, or how much to put away each month.
• Salary & Hourly Wage Calculator — Convert pay between hourly, daily, weekly, monthly and yearly amounts.
• Tip Calculator — Work out the tip and split the bill evenly, with an option to round up.
• Discount Calculator — Find the sale price and how much you save, including stacked discounts and tax.
• Sales Tax & VAT Calculator — Add tax to a price, or take it out of a tax-inclusive price. Works for VAT and GST.
• Profit Margin & Markup Calculator — Get profit, margin and markup from a cost and price — or set a price from a target margin.
• Fuel Cost Calculator — Work out what a drive will cost in fuel, in miles or kilometres.
• BMI Calculator — Body mass index in metric or US units, with the healthy weight range for your height.
• Age Calculator — Exact age in years, months and days, plus total days and the countdown to your next birthday.
• Date Calculator — Count the days between two dates, or add and subtract days, weekdays, months or years.
• Hours Calculator (Time Card) — Add up the hours you worked each day, minus breaks, with optional pay.
• Unit Converter — Convert length, weight, temperature, volume, area, speed, time and data sizes.
• Fraction Calculator — Add, subtract, multiply and divide fractions and mixed numbers, simplified.
• Average Calculator — Mean, median, mode, range and standard deviation for any list of numbers.
• Grade Calculator — Turn a test score into a percentage and letter grade.
• Aspect Ratio Calculator — Find the aspect ratio of any size and resize without stretching.
• Roman Numeral Converter — Convert numbers to Roman numerals and back, from 1 to 3,999.
• Binary, Hex & Decimal Converter — Convert numbers between decimal, binary, hexadecimal and octal — any size.
• Simple Interest Calculator — Interest on a principal at a flat rate, over years, months or days.
• Credit Card Payoff Calculator — How long a card balance takes to clear, and the interest it costs.
• Inflation Calculator — What today’s money will cost, or be worth, years from now.
• ROI Calculator — Return on investment as a percentage, with an optional yearly rate.
• Break-Even Calculator — How many sales it takes to cover your costs.
• Overtime Pay Calculator — Regular and overtime pay at time and a half, double time or 1.25×.
• Unit Price Calculator — Compare two pack sizes and see which is the better deal.
• Electricity Cost Calculator — What an appliance costs to run per day, month and year.
• Area Calculator — Area of rectangles, triangles, circles and more, in m² and ft².
• Volume Calculator — Volume of boxes, cylinders, spheres and cones, in litres too.
• Calorie Calculator — Estimate daily calories (TDEE) and BMR from age, size and activity.
• Sleep Calculator — Bedtimes or wake-up times that line up with 90-minute sleep cycles.
• Running Pace Calculator — Pace per km and mile from distance and time, plus race predictions.
• Time Calculator — Add or subtract hours, minutes and seconds.
• GPA Calculator — Grade point average from letter grades and credits, on a 4.0 scale.
• CAGR Calculator — The steady yearly growth rate between a start and end value.
• APR to APY Calculator — Turn a nominal APR into the effective yearly rate (APY).
• Debt-to-Income Ratio Calculator — Your DTI ratio, the number lenders check before a loan.
• Net Worth Calculator — Add up what you own and owe to get your net worth.
• Pay Raise Calculator — Your new pay after a raise, as a percentage or an amount.
• Commission Calculator — Commission on a sale, with optional base pay.
• Exponent Calculator — Raise any number to any power, with roots and E notation.
• Ratio Calculator — Solve A : B = C : D for the missing value, and simplify ratios.
• Percent Error Calculator — How far a measured value is from the accepted one.
• Weighted Average Calculator — An average where some values count more than others.
• Rounding Calculator — Round to decimal places or the nearest 10, 100 or 1,000.
• Scientific Notation Converter — Convert numbers to and from scientific and E notation.
• LCM & GCF Calculator — Greatest common factor and least common multiple of any list.
• Prime Factorization Calculator — Break a number into primes, and check whether it is prime.
• Quadratic Equation Solver — Solve ax² + bx + c = 0, including complex roots.
• Pythagorean Theorem Calculator — Find the missing side of a right triangle.
• Circle Calculator — Area, circumference, radius and diameter from any one of them.
• Ohm’s Law Calculator — Volts, amps, ohms and watts from any two of them.
• Speed, Distance & Time Calculator — Solve for speed, distance or travel time.
• Download Time Calculator — How long a file takes to download at your connection speed.
• Gas Mileage Calculator — Your car’s real mpg or L/100 km from a fill-up.
• Paint Calculator — How much paint a room needs, in litres or gallons.
• Tile Calculator — How many tiles and boxes to buy for a floor or wall.
• Concrete Calculator — Concrete for a slab in cubic yards or metres, plus bag counts.
• Week Number Calculator — The ISO week number and day of the year for any date.
• Currency Converter — Convert between 30 currencies with the European Central Bank’s daily rates.
• Word Counter — Count words, characters, sentences and paragraphs instantly as you type.
• Case Converter — Switch text between UPPERCASE, lowercase, Title Case and Sentence case.
• Remove Duplicates & Sort Lines — Remove duplicate and empty lines, trim spaces and sort any list.
• Find and Replace — Find and replace words or patterns in any text, with whole-word and regex options.
• Remove Line Breaks — Join broken lines from PDFs and emails while keeping paragraphs intact.
• URL Slug Generator — Turn titles into clean, SEO-friendly URL slugs, one or many at a time.
• Lorem Ipsum Generator — Placeholder text by paragraphs, sentences or words for mockups and layouts.
• Base64 Encode & Decode — Encode text to Base64 or decode it back, with full Unicode support.
• URL Encode & Decode — Percent-encode text for URLs and query strings, or decode it back.
• Sort Lines Alphabetically — Sort a list A–Z, Z–A, by number or by length.
• Remove Duplicate Lines — Delete repeated lines from a list and keep the first of each.
• Add Line Numbers — Number every line of text, with your choice of format.
• Add Prefix & Suffix to Lines — Add text to the start or end of every line at once.
• Reverse Text — Write text backwards, or reverse the order of words or lines.
• Text Repeater — Repeat a word or phrase as many times as you like.
• Word Frequency Counter — See which words you use most, with counts and percentages.
• Email Extractor — Pull every email address out of a block of text.
• URL Extractor — Pull every link out of a block of text.
• Remove HTML Tags — Strip HTML tags and get clean plain text.
• HTML Entity Encoder & Decoder — Escape special characters for HTML, or decode entities.
• Morse Code Translator — Translate text to Morse code and back.
• Caesar Cipher & ROT13 — Encode or decode a Caesar shift cipher, including ROT13.
• NATO Phonetic Alphabet Converter — Spell out codes and names as Alfa, Bravo, Charlie…
• JSON Formatter & Validator — Pretty-print, minify and validate JSON, with the exact line of any error.
• CSV to JSON Converter — Turn CSV or spreadsheet data into JSON.
• JSON to CSV Converter — Turn a JSON array into CSV for spreadsheets.
• Hash Generator (SHA-256, SHA-1, MD5) — SHA-256, SHA-1 and MD5 hashes of any text.
• JWT Decoder — Read the header and payload of a JSON Web Token.
• Binary Translator — Text to binary, hex, decimal or octal bytes — and back.
• Color Converter & Contrast Checker — Convert HEX, RGB and HSL colours and check text contrast against WCAG.
• Unix Timestamp Converter — Convert Unix timestamps to readable dates and dates back to timestamps.
• UUID Generator — Generate random version 4 UUIDs (GUIDs), one or a thousand at a time.
• Password Generator — Create strong random passwords locally in your browser. Nothing is sent or stored.
• Random Number Generator — Fair random numbers in any range — roll dice, flip coins or draw unique lottery picks.
• Character Counter — Count characters, bytes and SMS parts, with limits for X, Instagram and more.
• Text Diff Checker — Compare two texts and highlight every added, removed and changed line.
• Markdown Previewer — Write Markdown and see the formatted result live, then copy the HTML.
• Remove Extra Spaces — Collapse double spaces, trim lines and remove extra blank lines.
• Random Text Generator — Generate random words, sentences, paragraphs or character strings.
• RTF to TXT Converter — Extract plain text from an RTF (rich text) file.
• JSON Validator — Check JSON and get the exact line, column and reason for any error.
• JSON Minifier — Strip all whitespace from JSON to make it as small as possible.
• HTML Formatter — Indent messy or minified HTML so it’s easy to read.
• HTML Minifier — Remove comments and extra whitespace from HTML.
• CSS Formatter — Turn minified CSS into neatly indented, readable rules.
• CSS Minifier — Compress CSS by removing comments and whitespace.
• JavaScript Minifier — Minify JavaScript with Terser: shorter names, no comments, smaller files.
• Regex Tester — Test regular expressions live with highlighted matches and groups.
• SQL Formatter — Format SQL queries with clauses on their own lines and uppercase keywords.
• XML Formatter — Validate, pretty-print or minify XML.
• XML to JSON Converter — Convert XML to JSON, with attributes, repeated elements and numbers handled.
• YAML to JSON Converter — Convert YAML to JSON, or JSON to YAML, with clear error messages.
• HTTP Status Code Lookup — Look up what any HTTP status code means, from 100 to 511.
• Password Strength Checker — See how strong a password really is, checked privately on your device.
• Random Token Generator — Generate secure random tokens and secrets in hex, Base64 or UUID format.
• SHA-256 Hash Generator — Create SHA-256 and HMAC-SHA256 hashes of any text.
• Text Encryption & Decryption — Encrypt a message with a passphrase using AES-256, and decrypt it later.
• Robots.txt Generator — Create a robots.txt file to guide search engines and AI crawlers.
• Sitemap.xml Generator — Turn a list of page URLs into a valid XML sitemap.
• Privacy Policy Generator — Draft a plain-English privacy policy template for your website.
• Terms and Conditions Generator — Draft a simple terms and conditions template for a website.
• Time Zone Converter — Convert a time between time zones, with daylight saving handled for you.
• Online Stopwatch — A precise stopwatch with lap times and keyboard shortcuts.
• Countdown Timer — Count down a length of time or to a date, with a beep at the end.
• Typing Speed Test — Measure your typing speed in words per minute, and your accuracy.
• File Size Converter — Convert between bytes, KB, MB, GB and TB, and binary KiB, MiB, GiB.
• CSS Gradient Generator — Design linear, radial and conic gradients and copy the CSS.
• Box Shadow Generator — Build soft, layered CSS box shadows visually.
• Border Radius Generator — Round corners visually, all at once or one by one.
• CSS Button Generator — Design a button and copy the CSS, including hover and focus styles.
• Color Palette Generator — Generate harmonious colour palettes from one base colour.
• Font Pairing Previewer — Preview heading and body font combinations and copy the CSS.
• Meta Tag Generator — Generate SEO and social meta tags for your page’s <head>.
• Open Graph Previewer — Preview how a link card will look when shared, and get the OG tags.
• Favicon Previewer — See your favicon in browser tabs, bookmarks and on a home screen.
• Responsive Screen Size Tester — View a web page at phone, tablet and desktop sizes side by side.
• QR Code Generator — Make QR codes for links, Wi-Fi, email, phone and text. PNG or SVG, free forever.
• Image Compressor — Shrink JPG, PNG and WebP images in your browser, in batches, with a quality slider.
• Image Resizer — Resize images to exact pixels or a percentage, keeping proportions, in batches.
• Image Format Converter — Convert images between PNG, JPG, WebP, ICO and BMP right in your browser.
• Image Cropper — Crop images by dragging a box, with presets for square, 16:9 and social posts.
• Image Rotator — Rotate, flip and straighten images, then download them.
• HEIC to JPG Converter — Convert iPhone HEIC photos to JPG or PNG without uploading them.
• JPG to PNG Converter — Convert JPG photos to lossless PNG files, many at a time.
• WebP to JPG Converter — Convert WebP images to JPG so they open everywhere.
• SVG to PNG Converter — Render SVG files as sharp PNG, JPG or WebP images at any size.
• PNG to SVG Converter — Trace a PNG or JPG into a scalable SVG vector, ideal for logos and icons.
• PNG to ICO Converter — Turn a PNG into a multi-size .ico file for websites and Windows.
• Favicon Generator — Make a complete favicon set from an image or letters, with the HTML to paste.
• Color Picker from Image — Click anywhere on an image to get its HEX, RGB and HSL colour, plus its main colours.
• Image Metadata Viewer — See hidden EXIF data such as camera, date and GPS location, and save a clean copy.
• ZIP File Creator — Bundle files or a whole folder into a ZIP archive without uploading anything.
• ZIP File Extractor — Open a ZIP file, see what’s inside and download individual files.
• CSV to Excel Converter — Turn CSV data into a real .xlsx spreadsheet with a bold, frozen header row.
• Excel to CSV Converter — Convert any sheet of an .xlsx workbook to a CSV file.
• JSON to Excel Converter — Turn a JSON array into an Excel spreadsheet, flattening nested fields.
• PDF Compressor — Make PDFs smaller for email and upload limits, without uploading them anywhere.
• Merge PDF — Combine several PDFs, and images, into one PDF in the order you choose.
• Split PDF — Split a PDF by page ranges, every few pages, or into single pages.
• JPG to PDF Converter — Turn photos and images into a PDF, one per page, in any order.
• PDF to JPG Converter — Save PDF pages as JPG images at the resolution you choose.
• PDF to PNG Converter — Convert PDF pages to crisp, lossless PNG images.
• PDF to Word Converter — Get a PDF’s text into an editable Word (.docx) document.
• Word to PDF Converter — Convert .docx documents to PDF in your browser, with headings, lists and tables.
• PDF to Text Converter — Extract all the text from a PDF to copy or save as .txt.
• PDF Page Rotator — Rotate single pages or the whole PDF and save it permanently.
• PDF Page Deleter — Remove unwanted pages from a PDF and save the rest.
• PDF Page Organizer — Reorder, rotate and remove PDF pages by dragging thumbnails.
• PDF Password Protector — Add a password to a PDF with AES-256 encryption, right in your browser.
• PDF Unlocker — Remove the password from your own PDFs when you know it, or lift printing and copying restrictions.
• Audio Format Converter — Convert audio between MP3, WAV, M4A, OGG, Opus and FLAC, in batches.
• MP3 to WAV Converter — Convert MP3 files to uncompressed WAV for editing or CDs.
• WAV to MP3 Converter — Shrink WAV recordings into MP3 at the quality you choose.
• Audio Trimmer — Cut a section out of any audio file, with optional fades, and save it as MP3 or WAV.
• Audio Merger — Join several audio files into one, in any order, with optional pauses and fades.
• Audio Speed Changer — Speed up or slow down audio, with or without changing the pitch.
• Silence Remover — Automatically cut long pauses and dead air from recordings.
• Online Voice Recorder — Record your voice from the microphone and save it as MP3 or WAV.
• Text to Speech — Have any text read aloud with your device’s voices, at the speed you like.
• Audio to Text — Transcribe recordings to text with an AI model that runs on your device.
• Speech to Text — Speak into your microphone and get the text, transcribed on your device.
• Subtitle Generator — Create SRT or WebVTT subtitles for a video automatically, on your device.
• Video to MP3 Converter — Extract the soundtrack of a video as an MP3.
• Video Compressor — Make videos much smaller for email, chat apps and uploads.
• Video to GIF Converter — Turn a few seconds of video into a looping GIF.
• GIF to MP4 Converter — Convert animated GIFs to MP4 videos that are often 90% smaller.
• Video Trimmer — Cut a clip from a video, instantly and without quality loss.
• Video Resizer — Change a video’s resolution or reshape it for Reels, Stories and square posts.
• Video to Frames — Save stills from a video: the current frame, one every few seconds, or a set number.
• Subtitle Extractor — Save the subtitle tracks embedded in MKV and MP4 files as SRT, VTT or ASS.
• Video Metadata Viewer — See a video’s codec, resolution, frame rate, bitrate, tracks and tags.
• Image to Text (OCR) — Extract text from photos and scans with OCR that runs on your device.
• Screenshot to Text — Paste a screenshot and copy the text in it. OCR runs on your device.
• Background Remover — Remove the background from photos of people, pets and products, on your device.
• AI Image Upscaler — Enlarge photos 2× or 4× with an AI model that adds real detail, on your device.
• Username Generator — Turn a few keywords into creative, available-looking usernames for any platform.
• Bio Generator — Write a social media bio in your style that fits the platform’s character limit.
• Hashtag Generator — Get relevant hashtag ideas for your topic, grouped from specific to broad.
• Fancy Text Generator — Bold, italic, script and other copy-and-paste text styles.

Have an idea for a tool, or found something that isn't working? Let us know.