---
title: "Free Online Tools — Calculators, Converters & Health Checks | fbuff"
description: "75+ free online tools: tip and loan calculators, unit converter, blood pressure chart, BMI, days between dates, QR codes and photo tools. No signup, private."
url: https://fbuff.com/
---

Free tools

# Free online tools for everyday tasks

Calculators, converters, health checks and photo tools that work right in your browser. No signup, nothing to install, and what you type stays on your device.

## Most used

- [Money Tip Calculator Split bills, calculate tip by %, and round conveniently for groups.](https://fbuff.com/tools/tip-calculator)
- [Everyday Unit Converter Convert temperature, length, weight and cooking units instantly.](https://fbuff.com/tools/unit-converter)
- [Health Blood Pressure Checker Check a blood pressure reading against the American Heart Association categories, with plain-language next steps. 100% client-side.](https://fbuff.com/tools/blood-pressure-checker)
- [Health BMI Calculator Calculate your Body Mass Index with metric or imperial units. Shows BMI category, healthy weight range and BMI Prime.](https://fbuff.com/tools/bmi-calculator)
- [Everyday Date Difference Calculator Calculate the exact number of days, weeks, months, and years between two dates. Includes working-day count. 100% client-side.](https://fbuff.com/tools/date-diff)
- [Money Percentage Calculator Calculate percentages: X% of Y, what % is X of Y, percentage increase/decrease. Simple, fast, 100% client-side.](https://fbuff.com/tools/percentage-calculator)
- [Everyday QR Code Generator Generate QR codes for URLs, text, or Wi-Fi credentials. Entirely in your browser.](https://fbuff.com/tools/qr-generator)
- [Images & PDF Image Resizer & Aspect Ratio Resize images by pixels or percentage, select standard aspect ratios, lock proportions, and preview before downloading. 100% local.](https://fbuff.com/tools/image-resizer)

## Everyday

- [Everyday Unit Converter Convert temperature, length, weight and cooking units instantly.](https://fbuff.com/tools/unit-converter)
- [Everyday Age Calculator Find out how many days you've lived and countdown to your next birthday.](https://fbuff.com/tools/age-calculator)
- [Everyday Date Difference Calculator Calculate the exact number of days, weeks, months, and years between two dates. Includes working-day count. 100% client-side.](https://fbuff.com/tools/date-diff)
- [Everyday QR Code Generator Generate QR codes for URLs, text, or Wi-Fi credentials. Entirely in your browser.](https://fbuff.com/tools/qr-generator)
- [Everyday Ring, Shoe & Clothing Size Converter Ring size chart in mm plus shoe and clothing sizes across US, UK, EU, JP and VN.](https://fbuff.com/tools/size-converter)
- [Everyday TV Mounting Height Calculator How high to mount a TV: bottom edge, center and the exact drill height for the wall plate, to the nearest 1/8 inch.](https://fbuff.com/tools/tv-mount-height-calculator)
- [Everyday Countdown Timer Set a countdown timer with alarm beep. Works in background tab. No install needed.](https://fbuff.com/tools/countdown-timer)
- [Everyday Timezone Meeting Planner Compare a time across multiple cities to find a meeting slot that works for everyone.](https://fbuff.com/tools/timezone-planner)
- [Everyday Pomodoro Timer Run 5, 10, 25, or 50 minute focus timers with an MP3 alarm and browser notifications.](https://fbuff.com/tools/pomodoro-timer)
- [Everyday Random Number Generator Generate random numbers, roll dice, or pick random items from a list.](https://fbuff.com/tools/random-number-generator)
- [Everyday Random Choice Spinner Spin a lucky wheel for giveaways, team picks, lunch choices, and indecisive moments.](https://fbuff.com/tools/random-choice-spinner)
- [Everyday QR Code Decoder Decode QR codes from images or your camera. Reads URLs, WiFi, email and text. 100% client-side.](https://fbuff.com/tools/qr-decoder)
- [Everyday Todo / Task List Simple todo list with priority levels and filters. Everything saved locally in your browser.](https://fbuff.com/tools/todo-tasks)
- [Everyday Text to Speech Text to speech online free with built-in browser voices. Paste long text and read aloud online instantly.](https://fbuff.com/tools/text-to-speech)
- [Everyday Barcode Scanner Scan barcodes from images. Supports Code 128, EAN, UPC, PDF417, QR Code and more. 100% client-side.](https://fbuff.com/tools/barcode-scanner)
- [Everyday Barcode & PDF417 Generator Generate Code 128, EAN, UPC and PDF417 barcodes. Choose columns, set size, download PNG. 100% client-side.](https://fbuff.com/tools/barcode-generator)
- [Everyday Typing Speed Test Test your typing speed and accuracy in real time. Choose 15, 30, 60 or 120 seconds. 100% client-side.](https://fbuff.com/tools/typing-speed-test)
- [Everyday Stopwatch Precision stopwatch with lap times. Works in background tab. No install needed.](https://fbuff.com/tools/stopwatch)
- [Everyday 2048 The classic 2048 sliding tile puzzle. Combine matching numbers to reach 2048. Arrow keys or swipe. Best score saved locally.](https://fbuff.com/tools/2048)
- [Everyday Random Username Generator Generate random usernames combining an English word, random characters, and a trailing number. 10-15 characters, 100% client-side.](https://fbuff.com/tools/random-username-generator)
- [Everyday Quick Tally Calculator Tap a price button per item sold to build a running total, with quantity badges, a discount %, and fullscreen mode. 100% client-side.](https://fbuff.com/tools/quick-tally-calculator)
- [Everyday Downforce Calculator Downforce, fan suction and thrust needed for a car to drive upside down or lift off, with a live diagram and presets for the Tesla Roadster and F1.](https://fbuff.com/tools/downforce-calculator)

## Money

- [Money Tip Calculator Split bills, calculate tip by %, and round conveniently for groups.](https://fbuff.com/tools/tip-calculator)
- [Money Percentage Calculator Calculate percentages: X% of Y, what % is X of Y, percentage increase/decrease. Simple, fast, 100% client-side.](https://fbuff.com/tools/percentage-calculator)
- [Money Hourly to Salary Calculator Convert hourly pay to annual salary and back, with daily, weekly, biweekly and monthly pay.](https://fbuff.com/tools/hourly-salary)
- [Money Loan Calculator Calculate monthly payments and total interest. Compare two loan plans side-by-side.](https://fbuff.com/tools/loan-calculator)
- [Money How to Write a Check Type an amount to see how to write it on a check, in words with cents, and where everything goes.](https://fbuff.com/tools/check-writing-helper)
- [Money Invoice Generator Create professional invoices with logo, line items, and PDF export. Nothing leaves your browser.](https://fbuff.com/tools/invoice-generator)

## Health

- [Health Blood Pressure Checker Check a blood pressure reading against the American Heart Association categories, with plain-language next steps. 100% client-side.](https://fbuff.com/tools/blood-pressure-checker)
- [Health BMI Calculator Calculate your Body Mass Index with metric or imperial units. Shows BMI category, healthy weight range and BMI Prime.](https://fbuff.com/tools/bmi-calculator)
- [Health A1C Calculator Convert an A1C result to estimated average blood sugar in mg/dL and mmol/L, or blood sugar to A1C.](https://fbuff.com/tools/a1c-converter)
- [Health Ideal Weight Calculator Ideal body weight for your height and sex by the Devine, Robinson, Miller and Hamwi formulas.](https://fbuff.com/tools/ideal-weight)
- [Health TDEE / Calorie Calculator Calculate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR) based on age, weight, height and activity level.](https://fbuff.com/tools/tdee-calculator)
- [Health Water Intake Calculator Calculate your recommended daily water intake based on weight, activity level, and climate. 100% client-side.](https://fbuff.com/tools/water-intake)
- [Health Sleep Cycle Calculator Find the best times to wake up or go to sleep based on 90-minute sleep cycles. Feel refreshed, not groggy. 100% client-side.](https://fbuff.com/tools/sleep-calculator)
- [Health Medicine Reminder Medication schedule with meal timing, browser notifications and a calendar file for phone reminders. 100% local.](https://fbuff.com/tools/medicine-reminder)
- [Health Vision Test (Tumbling E) Screen your vision at home using the Snellen tumbling E chart. For reference only.](https://fbuff.com/tools/vision-test)
- [Health Pregnancy Calculator Calculate gestational week, due date and trimester from your last menstrual period.](https://fbuff.com/tools/pregnancy-calculator)
- [Health Pregnancy Weight Gain Guide Calculate recommended weight gain range during pregnancy based on your pre-pregnancy BMI.](https://fbuff.com/tools/pregnancy-weight-guide)
- [Health Fetal Kick Counter Count and time your baby's movements. Tap each time baby kicks and track time to reach 10 movements.](https://fbuff.com/tools/kick-counter)
- [Health Pregnancy Food Safety Checker Search foods to check if they are safe, limited, or should be avoided during pregnancy.](https://fbuff.com/tools/pregnancy-food-checker)
- [Health Pregnancy Nutrition Calculator Calculate extra calorie and key nutrient needs during pregnancy by trimester.](https://fbuff.com/tools/pregnancy-nutrition)

## Images & PDF

- [Images & PDF Image Resizer & Aspect Ratio Resize images by pixels or percentage, select standard aspect ratios, lock proportions, and preview before downloading. 100% local.](https://fbuff.com/tools/image-resizer)
- [Images & PDF Passport Photo Maker Make a passport or ID photo at the right size with enough pixels for online forms, or a 4×6 print sheet. Free, no sign-up.](https://fbuff.com/tools/passport-photo-maker)
- [Images & PDF Christmas Card Maker Make a Christmas card with a name and message, then download or share it. Free, no sign-up.](https://fbuff.com/tools/christmas-card-maker)
- [Images & PDF Birthday Card Maker Make a birthday card with a name and message, then download or share it. Free, no sign-up.](https://fbuff.com/tools/birthday-card-maker)
- [Images & PDF Save the Date Maker Make a save the date card with your names, date and place, then download or share it. Free, no sign-up.](https://fbuff.com/tools/save-the-date-maker)
- [Images & PDF Lunar New Year Card Maker Make a Chinese New Year card with a name and wishes, then download or share it. Free, no sign-up.](https://fbuff.com/tools/lunar-new-year-card-maker)
- [Images & PDF Graduation Card Maker Make a graduation card with the graduate's name and a message, then download or share it. Free, no sign-up.](https://fbuff.com/tools/graduation-card-maker)
- [Images & PDF Thanksgiving Card Maker Make a Thanksgiving card with a name and a message of thanks, then download or share it. Free, no sign-up.](https://fbuff.com/tools/thanksgiving-card-maker)
- [Images & PDF Custom Photo Shirt Maker Put a photo and a line of text on a shirt design: zoom and drag the photo in a square frame, pick a font and color, and download a 300 DPI print file.](https://fbuff.com/tools/photo-shirt-maker)
- [Images & PDF T-Shirt Mockup Generator Put your design on a realistic T-shirt, hoodie or sweatshirt mockup in any color and download a 2000 px image for Etsy listings. Free, no watermark.](https://fbuff.com/tools/tshirt-mockup-generator)
- [Images & PDF DPI Checker & Print Size Calculator Check the DPI and pixel size of any image, see how large it prints sharp, convert pixels to inches, and change the DPI of a PNG or JPG without losing quality.](https://fbuff.com/tools/dpi-checker)
- [Images & PDF Text Shirt Design Maker Type a short phrase, pick a typewriter font and an ink color, and download a 4500 x 5100 transparent PNG with the text placed on the chest.](https://fbuff.com/tools/text-shirt-design)
- [Images & PDF Curved Text Generator Curve text into an arch, a smile or a circle, pick a font, color and outline, and download a transparent 300 DPI PNG for shirts, mugs and logos.](https://fbuff.com/tools/curved-text-generator)
- [Images & PDF SVG to PNG Converter Convert SVG to a high-resolution PNG up to 10,000 px wide, with a transparent, white or custom background. Saved at 300 DPI for printing.](https://fbuff.com/tools/svg-to-png)
- [Images & PDF Mirror Image & Flip Image Flip an image horizontally or vertically, for sublimation, iron-on transfers or a selfie. Keeps the size, transparency and DPI.](https://fbuff.com/tools/mirror-image)
- [Images & PDF Photo Calendar Maker Make a printable monthly calendar with your own photo and important dates, then download or print it. Free, no sign-up.](https://fbuff.com/tools/photo-calendar-maker)
- [Images & PDF Image Compressor Compress JPG, PNG and WebP images in your browser without uploading.](https://fbuff.com/tools/image-compressor)
- [Images & PDF PDF Merge & Split Merge multiple PDFs into one or split a PDF into selected pages. 100% client-side.](https://fbuff.com/tools/pdf-tool)
- [Images & PDF Shipping Label 4×6 Converter Crop a letter-size shipping label PDF to a 4 × 6 PDF for thermal label printers. Free, nothing uploaded.](https://fbuff.com/tools/shipping-label-cropper)
- [Images & PDF Sign PDF Draw or type your signature and place it on a PDF, with the date. The rest of the document stays exactly as it was. Free, nothing uploaded.](https://fbuff.com/tools/sign-pdf)
- [Images & PDF JPG to PDF Converter Turn photos into one PDF, or save PDF pages as JPG images. 100% client-side.](https://fbuff.com/tools/jpg-to-pdf)
- [Images & PDF Image Format Converter Convert images between PNG, JPEG, WebP, and BMP formats. Adjust quality for JPEG/WebP. 100% client-side, no upload.](https://fbuff.com/tools/image-converter)
- [Images & PDF Gemini Watermark Remover Remove the Gemini sparkle and AI metadata (C2PA, EXIF, XMP) from images, in bulk or a whole folder, and hidden characters from AI text.](https://fbuff.com/tools/ai-watermark-remover)
- [Images & PDF Background Remover Remove portrait backgrounds with in-browser ML and download a transparent PNG locally.](https://fbuff.com/tools/background-remover)
- [Images & PDF Color Palette Extractor Upload an image and extract 5 dominant colors with HEX and HSL.](https://fbuff.com/tools/color-palette-extractor)
- [Images & PDF EXIF Viewer Read camera metadata from JPEG photos locally.](https://fbuff.com/tools/exif-viewer)
- [Images & PDF Image to ICO Converter Convert PNG, JPG, WebP and more to .ico favicon files with multiple sizes.](https://fbuff.com/tools/image-ico-converter)
- [Images & PDF Image Splitter Split any image into a grid of equal tiles or fixed-size pieces. Download all tiles at once. 100% client-side.](https://fbuff.com/tools/image-splitter)
- [Images & PDF Meme Generator Add bold top and bottom text to any image and download your meme. 100% client-side.](https://fbuff.com/tools/meme-generator)
- [Images & PDF Image Watermark Add a text or logo watermark to your images with adjustable position, size, and opacity. 100% client-side.](https://fbuff.com/tools/image-watermark)

## Text

- [Text Word Counter Count words, characters, sentences, and analyze text statistics.](https://fbuff.com/tools/word-counter)
- [Text String Case Converter Convert text to UPPERCASE, lowercase, camelCase, snake_case, kebab-case, PascalCase, and Title Case, with optional accent removal.](https://fbuff.com/tools/case-converter)
- [Text Text Diff Checker Paste two texts and instantly see word-level differences highlighted.](https://fbuff.com/tools/text-diff)
- [Text Pipe Delimiter Data Splitter Split and filter data columns using a pipe delimiter. Extract information quickly and format accounts easily.](https://fbuff.com/tools/pipe-data-splitter)
- [Text Readability Score Flesch-Kincaid reading ease, grade level, word count, and reading time.](https://fbuff.com/tools/readability-score)
- [Text HTML Text Extractor Strip HTML tags and extract plain text from any HTML. Handles scripts, styles, tables and links.](https://fbuff.com/tools/html-text-extractor)
- [Text Text Sorter & Deduplicator Sort, deduplicate, shuffle lines and compare two lists by exact match or substring. 100% client-side.](https://fbuff.com/tools/text-sorter)
- [Text Lorem Ipsum Generator Generate Lorem Ipsum placeholder text by paragraphs, sentences, or words. Copy instantly. 100% client-side.](https://fbuff.com/tools/lorem-ipsum)
- [Text Text Reverser Reverse text characters, word order, or line order. Flip text upside down with Unicode. 100% client-side.](https://fbuff.com/tools/text-reverser)

## Security & Privacy

- [Security & Privacy Redact PDF & Images Black out Social Security numbers, account numbers and other private details in a PDF or photo for good. Free, nothing uploaded.](https://fbuff.com/tools/pdf-redactor)
- [Security & Privacy Password Generator Generate strong random passwords instantly. 100% client-side.](https://fbuff.com/tools/password-generator)
- [Security & Privacy DarkSword iPhone Check Type your iOS version to see if your iPhone is open to DarkSword or P7 DarkSword spyware, and the update that fixes it.](https://fbuff.com/tools/darksword-check)
- [Security & Privacy PHP2Shell Checker Check if your PHP version is patched against PHP2Shell (CVE-2026-109618, CVE-2026-109619) from php -v or phpinfo() output.](https://fbuff.com/tools/php2shell-checker)
- [Security & Privacy HTTP2Shell Checker Check if Node.js, Bun or Brotli is patched against HTTP2Shell (Node2Shell, CVE-2026-111497) and copy the commands to check, update and block it.](https://fbuff.com/tools/http2shell-checker)
- [Security & Privacy KSMBD Exposure Checker Paste a few command outputs to see if a Linux server is exposed to the unpatched KSMBD flaws ZDI-CAN-33774 and ZDI-CAN-33549, and turn KSMBD off.](https://fbuff.com/tools/ksmbd-checker)
- [Security & Privacy CVE-2026-98432 Checker Check if a Linux server has the IPv4 TCP use-after-free CVE-2026-98432 (CVSS 9.8) that Anthropic exploited over MPTCP, and how to patch or harden it.](https://fbuff.com/tools/cve-2026-98432-checker)
- [Security & Privacy Image Metadata Stripper Remove EXIF, GPS, and all metadata from images locally.](https://fbuff.com/tools/image-metadata-stripper)
- [Security & Privacy 2FA Code Generator Generate TOTP codes from your 2FA secret key. Never leaves your browser.](https://fbuff.com/tools/2fa-code)
- [Security & Privacy MD5 Encoder Generate MD5 hashes from text locally in your browser.](https://fbuff.com/tools/md5-encoder)
- [Security & Privacy Hash Generator Generate SHA-1, SHA-256, SHA-512 hashes from text or files. 100% client-side.](https://fbuff.com/tools/hash-generator)
- [Security & Privacy Text Encryptor Encrypt and decrypt text with a passphrase using AES-GCM. 100% client-side, powered by Web Crypto.](https://fbuff.com/tools/text-encryptor)

## Developer

- [Developer JSON Path Finder Inspect JSON, copy exact JSONPath expressions, and test paths locally.](https://fbuff.com/tools/json-path-finder)
- [Developer URL Encoder Decoder Encode and decode URL components locally in your browser.](https://fbuff.com/tools/url-encoder-decoder)
- [Developer Base64 Encoder Decoder Encode and decode Base64 text locally in your browser.](https://fbuff.com/tools/base64-encoder-decoder)
- [Developer GUID / UUID Generator Generate UUIDs and convert GUIDs to short GUIDs locally in your browser.](https://fbuff.com/tools/guid-uuid-generator)
- [Developer Unix Timestamp Converter Convert Unix epoch to datetime and back. 100% client-side.](https://fbuff.com/tools/unix-timestamp)
- [Developer Color Picker Pick any color and copy HEX, RGB, and HSL values instantly.](https://fbuff.com/tools/color-picker)
- [Developer Contrast Checker Check WCAG AA/AAA color contrast ratios instantly.](https://fbuff.com/tools/contrast-checker)
- [Developer CSS Gradient Builder Build linear and radial CSS gradients visually.](https://fbuff.com/tools/css-gradient-builder)
- [Developer JSON Formatter Format, prettify and validate JSON instantly. Minify in one click.](https://fbuff.com/tools/json-formatter)
- [Developer Cron Job Parser Parse full crontab lines with commands, explain the schedule, and preview the next 5 runs.](https://fbuff.com/tools/cron-parser)
- [Developer HTML Previewer Write or paste HTML and preview it live in a sandboxed iframe. Supports full pages and fragments.](https://fbuff.com/tools/html-previewer)
- [Developer JWT Decoder Decode and inspect JWT tokens. View header, payload claims and expiry status instantly.](https://fbuff.com/tools/jwt-decoder)
- [Developer Regex Tester & Extractor Test regular expressions in real time, inspect capture groups, and generate code snippets.](https://fbuff.com/tools/regex-tester)
- [Developer Slug Generator Convert any title or phrase into a clean URL slug. Handles accents, spaces, and special characters. 100% client-side.](https://fbuff.com/tools/slug-generator)
- [Developer Color Palette Generator Generate harmonious color palettes from a base color — complementary, triadic, analogous, split-complementary. Copy HEX codes instantly.](https://fbuff.com/tools/color-palette-generator)
- [Developer Number Base Converter Instantly convert numbers between binary, octal, decimal, and hexadecimal. Supports large numbers. 100% client-side.](https://fbuff.com/tools/number-base)