How-to guides & comparisons
Step-by-step guides for everyday file and number tasks — PDFs, photo cut-outs and resizing, signatures, QR codes, percentages, BMI and more.
How to Extract Pages from a PDF and Save Them as a New File
Need just a few pages from a long PDF? Learn how to extract pages into a new file, write page ranges correctly, and combine pages from several PDFs—no uploads.
How to Crop PDF Margins for Easier Reading on Any Screen
Learn how to crop PDF margins so pages are easier to read on phones and tablets, print better several to a sheet, and lose dark scan borders. Free, no uploads.
How to Rotate a PDF and Save It Permanently (Free, No Upload)
Fix sideways or upside-down PDF pages for good. Learn why scans come out wrong, how saved rotation differs from view rotation, and how to fix it free in your browser.
How to Scan Documents to PDF With Your Phone (No Scanner)
Turn phone photos into a clean, readable PDF without a scanner. Shooting tips, cropping, brightening, page order and file size, all done in your browser.
How to Add Page Numbers to a PDF (and Skip the Cover Page)
Learn how to add page numbers to a PDF, choose a position and format, skip the cover page and set the start number, all free in your browser with no uploads.
How to Copy Text from a PDF and Fix Broken Line Breaks
Learn why text copied from a PDF breaks into short lines, how to extract all of it in your browser, and how to turn the result back into clean paragraphs.
How to Print Multiple PDF Pages on One Sheet (2-up, 4-up)
Learn how to print 2, 4 or more PDF pages on one sheet for slides and handouts. Compare printer settings with an N-up PDF, and trim margins for bigger text.
How to Reduce PDF File Size for Email and Upload Limits
Shrink a large PDF to fit email and upload limits: why PDFs get big, methods compared, how to pick a compression level, and the right order of steps.
How to Sign a PDF Without Printing It (Free, No Upload)
Add a handwritten signature to a PDF without printing or scanning. Draw or upload your signature, place it with a click, and keep your files on your device.
How to Merge PDF Files for Free: 4 Methods Compared
Compare free ways to merge PDF files—online tools, Mac Preview, Windows and Acrobat—then combine PDFs in your browser without uploading them.
How to Split, Delete and Reorder PDF Pages (Free, No Upload)
Learn which free tool to use to split, delete, reorder or rotate PDF pages, how page ranges like 1, 3, 5-7 work, and how to do it all in your browser.
PDF to JPG and JPG to PDF: How and When to Convert
Learn when to turn a PDF into JPG images and when to combine photos into one PDF, how to pick dpi and page order, and how to convert in your browser.
Image
How to Make a Transparent Signature or Stamp PNG
Turn a signature or stamp on paper into a clean transparent PNG for e-signing. Shooting tips, step-by-step browser tool, ink color options, and cautions.
How to Resize an Image to Exact Pixel Dimensions
Resize images to exact pixel sizes for forms, product listings and blogs. Learn aspect ratio, cropping first, percentage scaling, and why upscaling blurs.
JPG vs PNG vs WebP: Which Image Format to Use and How to Convert
JPG, PNG or WebP? Compare compression, transparency, file size and compatibility, then convert images in your browser for free without uploading anything.
How to Add a Watermark to Photos and PDFs (Free, No Upload)
Learn when to watermark photos and PDFs, how to choose placement and opacity, and how to add a watermark in your browser for free without uploading files.
How to Crop Photos to 1:1, 4:5 or 16:9 (Free, No Upload)
Learn how to crop photos to square 1:1, portrait 4:5 or widescreen 16:9 with locked ratios, then resize and compress them in your browser without uploading files.
How to Make a Photo Black and White (and Fix Brightness)
Turn photos black and white or sepia, adjust brightness and contrast, and make faded document photos readable. Free, in your browser, with no uploads.
How to Make a QR Code for Free (Links, Wi-Fi and Text)
Make a free QR code for a link, Wi-Fi network or plain text. Learn static vs dynamic codes, pick size, colors and error correction, and test before printing.
How to Remove a Photo Background Free (No Upload)
Remove the background from any photo for free, right in your browser. Get a transparent, white or colored background, fix edges by hand, and lay out product shots.
How to Convert HEIC to JPG on Windows, Android and Mac
Can't open iPhone HEIC photos? Learn what HEIC is and how to convert HEIC to JPG on Windows, Android or Mac — free, in your browser, with no uploads.
How to Reduce Image File Size for Email and Uploads
Photo too big to send or upload? Learn how compression, resizing and the right format (JPG, PNG or WebP) shrink images to any size limit, right in your browser.
Calculators
Inches to Centimeters: Formula, TV Sizes and Quick Chart
Convert inches to cm with the exact 1 in = 2.54 cm formula, a quick chart, height in feet and inches, and the real width and height of 16:9 TV screens.
Pounds to Kilograms & Ounces to Grams: Formula and Chart
Convert pounds to kilograms and ounces to grams with exact factors, worked examples, quick mental math, a ready chart, and stone for body weight.
Celsius to Fahrenheit: Formula, Quick Chart and Mental Math
Convert Celsius to Fahrenheit and back with the exact formula, a quick chart for weather, oven and body temperatures, and a shortcut you can do in your head.
How to Calculate BMI and Find Your Healthy Weight Range
Learn the BMI formula in metric and imperial units, see the WHO categories, find a healthy weight range for your height, and understand where BMI falls short.
How to Calculate Percentages, Discounts and Percent Change
Learn the simple formulas for percentages, percent change, sale prices and stacked discounts, plus common mistakes, with worked examples and free calculators.
How to Count Days Between Dates and Until a Deadline
Learn how to count days between two dates, run a countdown to a deadline, and add days to a date, including start/end day rules and leap years.
Equal Payments vs Equal Principal: Loan Repayment Types
Compare equal payments, equal principal and interest-only loans, see how total interest differs, and test your own scenarios with a free loan calculator.
Exact Age Calculator Guide: Years, Months and Days
Learn how to calculate your exact age in years, months and days by hand, handle leap-day birthdays, and count days lived or days until your next birthday.
How to Add or Remove VAT from a Price (With Formulas)
Learn the simple formulas to add VAT to a net price or remove it from a gross price, avoid the common subtraction mistake, and round amounts correctly.
Unit Conversion Cheat Sheet: Length, Weight, Area & Temperature
Key conversion factors for inches, feet, miles, pounds, ounces, square feet, acres and °C/°F, plus US vs UK gallons and cups, and common mistakes to avoid.
Text
Random Seating Chart and Group Maker for Classrooms
Make a random seating chart or split names into even groups in seconds. Set rows, seats or group count, then save, copy or share the result. Free, no uploads.
Online Ladder Game (Amidakuji): Fair Prize and Chore Picks
Use a free online ladder game (Amidakuji) to fairly assign prizes, chores or turns. Learn why every path ends at a different prize, plus step-by-step tips.
Wheel Spinner: Pick Lunch, Winners or a Random Order Free
Spin a free wheel to pick lunch, raffle winners or who goes first. Type entries, spin, remove winners for a full order, then save an image or share a link.
How to Change Text Case: UPPER, lower, Title & camelCase
Fix text typed with Caps Lock on, or switch between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more, free in your browser.
How to Count Words and Characters (With and Without Spaces)
Learn how to count words and characters with and without spaces, how line breaks and punctuation count, and how to trim text to fit any limit for free.
How to Pick a Random Winner or Split Into Fair Teams
Run a fair giveaway draw, set a random speaking order, or split a group into balanced teams in your browser. Compare methods and follow simple steps.
How to Create a Strong Password (and Keep Track of It)
Learn how to create a strong password: why length matters, patterns to avoid, passphrases, password managers and 2FA, plus a free random password generator.