Password Protect PDF
Add a password to any PDF so it can only be opened by people who have it. Fast, private, and completely free.
Click or drag and drop a PDF file
One PDF at a time. Your file never leaves your browser.
Why Flip Caps
Lock your documents in seconds
Real AES Encryption
Your PDF is encrypted with the standard PDF security handler, the same scheme business document tools use. The password is genuinely required to open the file.
100% Private
Your PDF and password never leave your browser. All encryption happens locally with JavaScript, so nothing is uploaded to any server.
Set Permissions
Beyond a password to open, you can block printing, copying text, and editing for anyone who opens the document.
Instant and Free
Protect a document in seconds with no account, no sign-up, and no watermark added to your file.
Works Everywhere
The protected PDF opens in Acrobat, Preview, Chrome, Edge, and every standard PDF reader on desktop and mobile.
Works on Mobile
Protect a PDF straight from your phone or tablet. No desktop software to install.
How It Works
Three steps to a protected PDF
Upload Your PDF
Click the upload area or drag a PDF onto the page. The file is loaded into your browser only, never sent anywhere.
Set a Password
Type the password you want, confirm it, and optionally choose which actions to allow once the file is opened.
Download
Click Protect PDF and download your encrypted file. From now on it asks for the password every time it is opened.
Frequently Asked Questions
Is the password protection real encryption?
Yes. The file is encrypted using the standard PDF security handler. Without the password the content cannot be read, and every compliant PDF reader will prompt for the password before opening it.
Are my PDF and password uploaded to a server?
No. Everything happens in your browser using JavaScript. Your document and the password you choose are never sent to any server, so the process is completely private.
What happens if I forget the password?
There is no way to recover it. The password is not stored anywhere, so keep your original unprotected file as a backup in a safe place before you protect it.
Can I stop people from printing or copying my PDF?
Yes. Open the permissions options and untick printing, copying, or editing. Those actions are then blocked for anyone who opens the file with the password.
Will the protected PDF open on phones and other apps?
Yes. The protected file follows the standard PDF format, so it opens in Acrobat, Apple Preview, Chrome, Edge, and mobile PDF apps. Each will ask for the password.
Can I protect a PDF that already has a password?
Not directly. You would need to open it with its current password and remove that first, then protect it again with a new password.
About Password Protect PDF
The Flip Caps Password Protect PDF tool encrypts any PDF directly in your browser, so a password is required before the document can be opened. It is ideal for contracts, invoices, statements, medical records, and anything else you want to share securely.
The encryption runs entirely client side, which means your file and your password are never uploaded. You can also restrict printing, copying, and editing, giving you control over what a reader can do once the file is open.
All Tools
Every tool, in one place.
158+ free tools. All run in your browser - no sign-up, no uploads, nothing stored.
Text Tools
View all →Text Case Converter
Convert any text between 7 case styles instantly: UPPER CASE, lower case, Title Case, Sentence case, Capitalized Case, alternating case, and Inverse case.
Letter & Character Removal
Remove any specific letter, character, or symbol from text in one click. Strip numbers, punctuation, spaces, or any custom character you define.
Duplicate Line Remover
Remove every duplicate line from a list instantly. Keep only unique lines with optional case-insensitive matching and automatic sorting.
Duplicate Word Finder
Find and highlight every word that appears more than once in your text. Quickly spot and clean up repetitive writing.
Em Dash Remover
Remove or replace em dashes instantly. Swap them for a comma, hyphen, space, or delete them entirely. Great for cleaning up AI-generated text.
Dash Remover
Remove or replace any type of dash: em dash, en dash, or hyphen. Choose your replacement character or strip them completely in one click.
Find and Replace Text
Find any word or phrase and replace every occurrence across your entire text in one click. Supports plain text and case-insensitive matching.
Sentence Counter
Count sentences, words, characters, paragraphs, and lines in any text. Get an estimated reading time based on average adult reading speed.
Remove Line Breaks
Strip unwanted line breaks to produce a clean, flowing paragraph. Perfect for fixing copied PDF or email content with hard returns.
Remove Text Formatting
Strip bold, italic, and all rich text formatting from pasted content. Convert any formatted text to clean plain text instantly.
Remove Underscores
Replace underscores in text with a space, hyphen, or remove them entirely. Convert snake_case identifiers to human-readable words.
Reverse Text Generator
Reverse any text backwards: flip character order, reverse word order, or reverse entire line order. Results appear instantly in your browser.
Alphabetical Order
Sort words or lines into A-Z or Z-A alphabetical order instantly. Supports duplicate removal and case-insensitive sorting.
Email Extractor
Extract and scrape all email addresses from any text, HTML, or document. Supports deduplication, sorting, and multiple separators.
URL Extractor
Extract and scrape all URLs and links from any text or HTML source. Deduplicates, sorts, and normalizes www. links.
Upside Down Text
Flip text upside down and backwards using Unicode characters. Copy and paste anywhere — works on all platforms.
Add Commas to Numbers
Automatically add thousands separators to every number in your text. Supports US/UK comma format and European period format.
Remove Emojis
Strip all emoji symbols and Unicode characters from any text instantly. Choose to remove only emojis or all non-ASCII characters.
Bold Text Generator
Convert normal text to bold using Unicode Mathematical Bold characters. Paste bold text anywhere — social media, bios, messages.
Italic Text Generator
Convert normal text to italic using Unicode Mathematical Italic characters. Works in Instagram, Twitter, Discord, and any plain-text field.
Slug Generator
Convert any title or phrase into a clean URL slug. Choose your separator, remove stop words, and set a max length. Perfect for blog posts, pages, and SEO-friendly URLs.
Lorem Ipsum Generator
Generate placeholder lorem ipsum text by paragraphs, sentences, or words. Choose how much you need and copy it instantly. The classic tool for designers and developers.
Text Repeater
Repeat any word, phrase, or block of text as many times as you need. Choose your separator and get the output instantly.
Remove AI Formatting
Paste ChatGPT or AI-generated text and strip all markdown formatting - bold headers, bullet points, dividers, and numbered lists - leaving clean, plain content.
PDF Tools
View all →Merge PDF
Combine multiple PDF files into one document. Drag, drop, reorder, and merge — free and private.
Split PDF
Split a PDF into individual pages or custom page ranges. Download as individual files or a ZIP archive.
Compress PDF
Reduce the file size of a PDF so it is easy to email, upload, and share. Choose a compression level, done privately in your browser.
Extract PDF Pages
Pick specific pages from any PDF and save them as a new document. Enter any combination of pages and ranges.
JPG to PDF
Turn JPG and JPEG photos into a single PDF. Add many at once, reorder them, and download one document.
PNG to PDF
Turn PNG images into a single PDF. Add many at once, reorder them, and download one document.
PDF to JPG
Convert every PDF page into a high-quality JPEG image. Download all pages at once as a ZIP archive.
PDF to PNG
Convert PDF pages to lossless PNG images. Perfect for presentations, web use, and image editing.
Add Watermark
Stamp any PDF with custom text. Control opacity, font size, color, position, and which pages to mark.
Add Page Numbers
Number every page of your PDF with full control over position, starting number, prefix, and suffix.
Header & Footer
Add custom headers and footers to every PDF page. Supports dynamic {page} and {total} variables.
Table of Contents
Create a professional table of contents page and prepend it to your PDF document.
Remove Blank Pages
Auto-detect and remove blank pages from scanned documents and digital PDFs.
Unlock PDF
Remove the password from a PDF you can already open, so it opens without a prompt. Private and instant in your browser.
Unit Converters
View all →Length Converter
Convert between all common length and distance units. Meters, feet, inches, miles, kilometers, and more.
Weight and Mass Converter
Convert between kilograms, pounds, ounces, grams, tons, and all other weight and mass units.
Volume Converter
Convert between liters, gallons, cups, fluid ounces, cubic meters, and all volume units.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine temperature scales.
Area Converter
Convert between square meters, acres, hectares, square feet, square miles, and all area units.
Pressure Converter
Convert between Pascal, bar, PSI, atmosphere, torr, mmHg, and all pressure units.
Energy Converter
Convert between joules, calories, BTU, kilowatt-hours, electronvolts, and all energy units.
Volume - Dry Converter
Convert between US dry volume units including bushels, pecks, dry gallons, dry quarts, and dry pints.
Power Converter
Convert between watts, kilowatts, horsepower, BTU/hour, and all power units.
Force Converter
Convert between newtons, pound-force, kilogram-force, dyne, and all force units.
Time Converter
Convert between seconds, minutes, hours, days, weeks, months, years, and all time units.
Speed Converter
Convert between meters per second, km/h, mph, knots, Mach, and all speed units.
Angle Converter
Convert between degrees, radians, gradians, arcminutes, arcseconds, and all angle units.
Fuel Consumption Converter
Convert between liters per 100km, miles per gallon (US/UK), km per liter, and all fuel economy units.
Data Storage Converter
Convert between bits, bytes, kilobytes, megabytes, gigabytes, terabytes (decimal and binary).
CM to Inches
Convert centimeters to inches instantly. Enter any value and get the exact result in decimal inches.
Meters to Feet
Convert meters to feet instantly. Useful for height, room dimensions, and construction measurements.
KM to Miles
Convert kilometers to miles instantly. Great for travel distances, running routes, and road trips.
Inches to CM
Convert inches to centimeters instantly. Essential for international sizing and measurements.
Feet to Meters
Convert feet to meters instantly. Useful for construction, aviation, and scientific measurements.
Miles to KM
Convert miles to kilometers instantly. Great for travel planning and fitness tracking.
KG to LBS
Convert kilograms to pounds instantly. Perfect for fitness, cooking, and shipping calculations.
LBS to KG
Convert pounds to kilograms instantly. Essential for international weight measurements and fitness.
Celsius to Fahrenheit
Convert Celsius to Fahrenheit instantly. Essential for weather, cooking, and science.
Fahrenheit to Celsius
Convert Fahrenheit to Celsius instantly. Perfect for understanding international weather and recipes.
Liters to Gallons
Convert liters to US gallons quickly. Great for fuel economy, cooking, and tank sizes.
Gallons to Liters
Convert US gallons to liters instantly. Useful for fuel, water tanks, and cooking.
Fitness Converter
Weight, height, distance, pace, calories - all fitness conversions in one place.
Image Tools
View all →PNG to JPG Converter
Convert PNG images to JPG format instantly in your browser. No upload to any server.
JPG to PNG Converter
Convert JPG images to PNG format with lossless output. 100% private, runs in your browser.
WebP to JPG Converter
Convert WebP images to JPG format for maximum compatibility. Client-side, instant results.
WebP to PNG Converter
Convert WebP images to PNG with full transparency support. No server, no sign-up.
PNG to WebP Converter
Convert PNG images to WebP for smaller file sizes. Works entirely in your browser.
JPG to WebP Converter
Convert JPG images to WebP format for better web performance. Fast and private.
Image Resizer
Resize any image to exact pixel dimensions. Supports PNG, JPG, and WebP. Client-side only.
Image Compressor
Compress images by adjusting quality to reduce file size. Works in your browser, no uploads.
Crop Image
Crop any image to the exact area you need. Draw a selection and apply in one click. No upload required.
Rotate Image
Rotate or flip any image instantly. Supports 90, 180, 270 degree rotation and horizontal or vertical flip.
Watermark Image
Add a custom text watermark to any image. Control position, size, opacity, and color. Runs in your browser.
Meme Generator
Add top and bottom text to any image in classic meme style. Customize font size, text color, and outline color.
Photo Editor
Adjust brightness, contrast, saturation, blur, and grayscale on any photo. Free, private, and instant.
Favicon Generator
Upload your logo and get favicon.ico plus all standard PNG sizes (16 to 512px) ready to drop into your website.
Add Logo to Image
Stamp your logo onto any photo in seconds. Pick any of 9 positions, control size and opacity, and optionally add your website URL. Runs entirely in your browser.
Remove EXIF Data
Strip GPS location, camera model, timestamps, and other hidden EXIF, IPTC, and XMP metadata from your photos before sharing them. Batch process multiple photos at once, entirely in your browser.
HEIC to JPG Converter
Convert iPhone HEIC and HEIF photos to universal JPG images. Convert many at once and download them all as a ZIP, entirely in your browser.
Circle Crop
Crop any image into a centered circle and export a transparent PNG, ideal for profile pictures and avatars. Batch process many at once in your browser.
Blur and Pixelate Image
Hide faces, names, license plates, and sensitive details by blurring or pixelating any part of an image. Apply it across a whole batch in your browser.
Calculators
View all →Age Calculator
Calculate your exact age in years, months, and days. See total days lived, hours, your zodiac sign, and days until your next birthday.
Percentage Calculator
Calculate percentages instantly. Find what percent X is of Y, calculate percent change, and work out percentage increases or decreases.
Discount Calculator
Calculate the final price after a discount. Enter the original price and discount percentage to see your savings instantly.
Tip Calculator
Calculate the tip on any bill. Split between multiple people and choose your tip percentage. Instant results, no sign-up needed.
Calculator
A simple, fast online calculator for everyday math. Add, subtract, multiply, divide, with percent, sign change, and full keyboard support.
Scientific Calculator
Full scientific calculator with trigonometry, logarithms, powers, roots, and memory functions. Works entirely in your browser.
Compound Interest Calculator
Calculate how your investment grows with compound interest. See the final balance, total interest earned, and year-by-year breakdown.
Loan Calculator
Calculate your monthly loan payment, total interest, and total repayment amount for any loan amount, rate, and term.
Mortgage Calculator
Calculate your monthly mortgage payment including principal and interest. Enter home price, down payment, rate, and loan term.
Savings Goal Calculator
Find out how much you need to save each month to reach your financial goal. Includes interest rate and existing savings.
BMI Calculator
Calculate your Body Mass Index (BMI) using height and weight in metric or imperial units. See your BMI category and healthy range.
Calorie Calculator
Calculate your daily calorie needs (TDEE) based on age, gender, height, weight, and activity level. Includes weight loss and gain targets.
Pregnancy Due Date Calculator
Calculate your estimated pregnancy due date from your last menstrual period. See key milestones and trimester dates.
Ideal Weight Calculator
Calculate your ideal body weight based on height and gender using four established medical formulas including Devine and Robinson.
GPA Calculator
Calculate your GPA by adding courses with grades and credit hours. Supports both letter grades and 4.0 scale inputs.
Grade Calculator
Find out what grade you need on your final exam to reach your target grade. Enter your current grade and the weight of the final.
Hours Worked Calculator
Calculate total hours worked from start and end times. Add break time, multiple shifts, and an optional hourly rate for pay.
Date Difference Calculator
Calculate the exact number of days, weeks, months, and years between any two dates.
Days Until Calculator
Find how many days until any event - Christmas, New Year, a birthday, or any custom date.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers. Supports 1 to 3,999.
Fraction Calculator
Add, subtract, multiply, and divide fractions. Results are automatically simplified to lowest terms.
Ratio Calculator
Simplify ratios, scale them up or down, and find a missing value in a proportion.
Average Calculator
Calculate mean, median, mode, range, sum, and count for any set of numbers.
Retirement Calculator
Calculate how much you need to save for retirement and whether your current savings are on track.
Debt Payoff Calculator
See how long it takes to pay off a debt and how much interest you pay at different monthly amounts.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method. Supports metric and imperial units.
Ovulation Calculator
Calculate your estimated ovulation date and fertile window based on your cycle length and last period.
Blood Alcohol Calculator
Estimate your blood alcohol content (BAC) based on drinks, weight, gender, and time elapsed.
Fuel Cost Calculator
Calculate the fuel cost for any trip based on distance, fuel efficiency, and gas price.
Unit Price Calculator
Compare two or more products by price per unit to find the best value. Great for grocery shopping.
Budget Planner (50/30/20)
Enter your income and see it split by the 50/30/20 rule into needs, wants, and savings. Adjust percentages, track actual spending, and see where you stand.
Monthly Expense Calculator
Add up what you spend daily and monthly, enter your income, and instantly see your total monthly spending, savings, and savings rate.
Paycheck Calculator
Estimate your take-home pay after federal tax, FICA, and deductions. See per-paycheck and annual breakdowns.
Tax Refund Estimator
Estimate your federal tax refund or amount owed based on income, withholding, and filing status.
Developer Tools
Password Generator
Generate strong, random passwords with custom length and character sets. Includes strength indicator and copy button.
Base64 Encoder/Decoder
Encode text or files to Base64 and decode Base64 strings back to plain text. Supports URL-safe mode.
Number to Words
Convert any number into English words. Supports up to trillions, ordinal mode, and currency format.
Screen Resolution Checker
Check your screen resolution, viewport size, device pixel ratio, color depth, browser, and OS instantly.
Aspect Ratio Calculator
Calculate the aspect ratio of any dimensions, or find a missing width or height from a known ratio.
Vanishing Note - Self-Destructing Notes
Send a secret note that self-destructs after being read. Encrypted in your browser, shared as a single-use link.
Script Splitter
Paste a long script and split it into copy-ready chunks of any character limit. Copy each part one at a time with a single click.
Print Pad
A multi-page document editor with text formatting, tables, images, margins, and find and replace. Print or save as PDF straight from your browser.
Fun and Random
View all →Dice Roller
Roll any number of dice in any combination - d4, d6, d8, d10, d12, and d20. Instant results.
Coin Flipper
Flip a virtual coin and get heads or tails instantly. Flip multiple coins at once.
Random Quote Generator
Get a random inspirational quote with one click. Hundreds of famous quotes from history's greatest minds.
Random Number Generator
Generate random numbers within any range. Generate multiple numbers and optionally keep them unique.
Yes or No Generator
Can't decide? Get a random yes or no answer instantly. Includes a maybe option for tough decisions.
Keyboard Tester
Test every key on your keyboard online. Choose from Windows full, TKL, 75%, 65%, 60%, Mac, and MacBook layouts.
Dead Pixel Tester
Check your monitor for dead or stuck pixels using solid color screens. Red, green, blue, black, white, and more.
Camera Shutter Count Checker
Upload a JPEG photo to check your camera's shutter count and view full EXIF camera details. Supports Canon and Nikon shutter count detection.
Magic 8-Ball
Ask the Magic 8-Ball any yes-or-no question and shake it for an answer. All 20 classic responses, just like the original toy.
Typing Speed Test
Test your typing speed and accuracy with 10 different passages. Live WPM tracking and character-level feedback.
Pros and Cons List
Build a structured pros and cons list for any decision. See the balance at a glance, then copy or print your list.
Baby Name Generator
Generate baby name ideas by gender, origin, starting letter, and meaning. Find the perfect name for boys, girls, or unisex.
Username Generator
Generate unique username and gamertag ideas from your name or keywords. Choose a style and get instant results.
Fantasy Name Generator
Generate fantasy names for characters, races, and places. Perfect for D&D, fiction writing, and worldbuilding.
Business Name Generator
Generate creative business and brand name ideas from your keywords. Pick a style and get instant suggestions.
New Year's Resolution Tracker
Set New Year's resolutions, break them into milestones, and track your progress throughout the year.
Spin the Wheel
Add names, spin the wheel, and let it decide. Great for random picks, giveaways, and classroom activities.
Random Team Generator
Paste a list of names and split them into random, balanced teams instantly. Set the number of teams, add custom team names, and re-shuffle as many times as you like.
Chore Wheel
Build a weekly chore schedule for your household. Add people and tasks, then randomize assignments fairly or set them manually.
Design and Color
Color Converter
Convert colors between HEX, RGB, HSL, and HSB formats instantly with a live color preview.
Random Color Generator
Generate random colors with their HEX, RGB, and HSL values. Copy any format instantly.
QR Code Generator
Generate a QR code from any URL or text. Download as PNG instantly. Free, private, no sign-up.
Color Palette Generator
Generate harmonious color palettes from any base color. Complementary, analogous, triadic, and more.
Time Tools
Alarm Clock
Free online alarm clock. Set an alarm time and get a browser alert and sound when it goes off.
Online Timer
Free countdown timer. Set hours, minutes, and seconds and get an alert when the time is up.
Stopwatch
Free online stopwatch with lap times. Start, stop, and reset with a single click.
Time Zone Converter
Convert time between any two cities or time zones instantly. Great for scheduling across countries.
Sleep Calculator
Calculate the best time to go to sleep or wake up based on 90-minute sleep cycles.
Holiday Countdown
Live countdowns to major holidays - Christmas, New Year, Thanksgiving, Halloween, and more.