The Curator · Free Tools
102 FREE Tools!
Useful, honest utilities for everyday work — PDFs, images, writing, money and code. Every tool is 100% free, needs no account, and runs entirely inside your browser, so your files and words never leave your device.
Word Counter
Count words, characters, sentences and reading time as you type.
Open tool →Text Compare (Diff Checker)
Compare two texts line by line and highlight what changed.
Open tool →Percentage Calculator
Work out X% of Y, what percent X is of Y, and percentage change.
Open tool →Mortgage Calculator
Estimate monthly mortgage payments, total interest and payoff cost.
Open tool →Compound Interest Calculator
See how savings grow with compounding and monthly contributions.
Open tool →Hourly to Salary Calculator
Convert hourly pay to weekly, monthly and annual salary — and back.
Open tool →JSON Formatter & Validator
Pretty-print, minify and validate JSON with clear error messages.
Open tool →Strong Password Generator
Create strong random passwords with your choice of characters.
Open tool →Image Compressor
Shrink JPG, PNG and WebP file sizes without uploading.
Open tool →Image Resizer
Resize images to exact pixel dimensions or a percentage.
Open tool →WebP to JPG Converter
Convert WebP images to JPG so they open everywhere.
Open tool →QR Code Generator
Make free QR codes for links, text, Wi-Fi and contacts — no sign-up, no expiry.
Open tool →Merge PDF
Combine several PDFs into one file, in the order you choose.
Open tool →Split PDF
Extract a page range from a PDF into a new file.
Open tool →JPG to PDF Converter
Turn one or more photos or scans into a single PDF.
Open tool →Rotate PDF
Turn sideways or upside-down PDF pages the right way up — all pages or just some.
Open tool →Favicon Generator
Create favicon and app-icon PNGs in every standard size from one logo.
Open tool →Sales Tax & VAT Calculator
Add tax to a price, or work out the tax inside a tax-inclusive price.
Open tool →Unix Timestamp Converter
Convert epoch timestamps to dates and dates to timestamps.
Open tool →CSV to JSON Converter
Turn spreadsheet CSV into a JSON array of objects.
Open tool →BMI Calculator
Body mass index in metric or imperial, with WHO categories.
Open tool →Days Between Dates Calculator
Count days, weeks and weekdays between two dates.
Open tool →PDF to JPG Converter
Turn every page of a PDF into a sharp JPG image.
Open tool →PDF to Text Extractor
Pull the plain text out of a PDF to copy, edit or search.
Open tool →HEIC to JPG Converter
Convert iPhone HEIC photos to JPG that open everywhere.
Open tool →Crop Image
Crop photos to square, 16:9, 4:3, portrait or any exact pixel size.
Open tool →Password Strength Checker
Estimate how hard a password is to guess — privately.
Open tool →Fuel Cost Calculator
Estimate the fuel cost of a road trip and split it between passengers.
Open tool →Online Stopwatch & Countdown Timer
A precise stopwatch with laps, and a countdown timer with an alarm.
Open tool →Cooking Measurement Converter
Convert cups, tablespoons, teaspoons, millilitres and fluid ounces.
Open tool →Time Zone Converter
Convert a meeting time between cities, with daylight saving handled.
Open tool →Weekly Time Card Calculator
Add up a week's shifts, breaks and overtime pay.
Open tool →Credit Card Payoff Calculator
How long to clear a card balance, and how much interest it costs.
Open tool →Colour Contrast Checker (WCAG)
Check text and background colours against WCAG AA and AAA.
Open tool →Case Converter
Switch text to UPPER, lower, Title, Sentence, camelCase and more.
Open tool →Remove Duplicate Lines
Delete repeated lines from lists, exports and logs — keep the first.
Open tool →URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
Open tool →Lorem Ipsum Generator
Generate placeholder paragraphs, sentences or words for designs.
Open tool →Loan Calculator
Monthly payment and total interest for personal, car or student loans.
Open tool →ROI Calculator
Return on investment, profit and annualised ROI in one place.
Open tool →Profit Margin Calculator
Gross margin, markup and profit from cost and selling price.
Open tool →Discount Calculator
Sale price and savings from any percentage off — including stacked deals.
Open tool →Tip Calculator
Tip amount and split the bill evenly between any number of people.
Open tool →Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to readable text.
Open tool →URL Encode / Decode
Percent-encode text for URLs or decode %20-style strings.
Open tool →Hash Generator (SHA-256, SHA-1, SHA-512)
Create SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
Open tool →UUID Generator
Generate random version-4 UUIDs in bulk.
Open tool →JWT Decoder
Decode a JSON Web Token's header and payload and read its expiry.
Open tool →Regex Tester
Test JavaScript regular expressions with live match highlighting.
Open tool →Color Converter (HEX, RGB, HSL)
Convert colours between HEX, RGB and HSL with a live preview.
Open tool →PNG to JPG Converter
Convert PNG images to smaller JPG files, with a background colour for transparency.
Open tool →JPG to PNG Converter
Convert JPG photos to lossless PNG files.
Open tool →Age Calculator
Exact age in years, months and days — plus days until the next birthday.
Open tool →Delete PDF Pages
Remove blank, duplicate or private pages from a PDF before you share it.
Open tool →Add Page Numbers to PDF
Stamp clean page numbers onto every page of a PDF.
Open tool →Watermark PDF
Add a diagonal DRAFT or CONFIDENTIAL watermark across every page.
Open tool →Rotate & Flip Image
Rotate photos 90° at a time and mirror them horizontally or vertically.
Open tool →Black & White / Sepia Image Filter
Turn a photo black and white, sepia or inverted in one click.
Open tool →Image to Base64 Converter
Turn an image into a Base64 data URI for HTML, CSS or JSON.
Open tool →Image Colour Picker
Click any pixel in a photo to get its exact HEX and RGB colour.
Open tool →Sort Lines Alphabetically
Sort a list A→Z, Z→A, by length, or shuffle it randomly.
Open tool →Find and Replace Text
Replace every occurrence of a word or pattern — with optional regex.
Open tool →Remove Extra Spaces
Collapse double spaces, trim lines and remove extra blank lines.
Open tool →Reverse Text
Reverse characters, word order or line order.
Open tool →Add Line Numbers
Number each line of text, with your own start and separator.
Open tool →Markup Calculator
Turn a cost and markup into a selling price — and see the real margin.
Open tool →Break-Even Calculator
Find how many units you must sell to cover your fixed costs.
Open tool →CAGR Calculator
Compound annual growth rate between a start and end value.
Open tool →Savings Goal Calculator
How much to save each month to reach a goal by a date.
Open tool →Inflation Calculator
See how inflation changes prices and buying power over time.
Open tool →Binary, Hex & Decimal Converter
Convert numbers between binary, octal, decimal and hexadecimal.
Open tool →HTML Entity Encoder / Decoder
Escape < > & " ' for HTML, or decode entities back to text.
Open tool →JSON to CSV Converter
Flatten a JSON array into a CSV you can open in a spreadsheet.
Open tool →Add Days to a Date
Find the date a number of days or weekdays from today.
Open tool →Length Converter
Convert mm, cm, metres, km, inches, feet, yards and miles.
Open tool →Weight Converter
Convert grams, kilograms, tonnes, ounces, pounds and stone.
Open tool →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin instantly.
Open tool →Random Number Generator
Pick fair random numbers in any range — with or without repeats.
Open tool →QR Code Scanner from Image
Read a QR code from a photo or screenshot — no camera app needed.
Open tool →JPG & PNG to WebP Converter
Convert images to WebP for faster websites — see the size saved.
Open tool →Word Frequency Counter
See which words you use most — great for editing and keyword checks.
Open tool →Text to Binary Converter
Convert text to 8-bit binary code and back again.
Open tool →Morse Code Translator
Translate text to Morse code and back — and hear it played.
Open tool →Roman Numeral Converter
Convert numbers to Roman numerals and back (1–3999).
Open tool →Unit Price Comparison Calculator
Which pack is really cheaper? Compare price per gram, ml or item.
Open tool →Pay Raise Calculator
See a raise as a percentage, a new salary and a real, after-inflation figure.
Open tool →Speed, Distance & Time Calculator
Solve for speed, distance or travel time from the other two.
Open tool →Area Converter
Convert square metres, hectares, acres, square feet and more.
Open tool →Volume Converter
Litres, millilitres, US and UK gallons, pints, fluid ounces and cubic feet.
Open tool →Speed Converter
Convert km/h, mph, metres per second, knots and feet per second.
Open tool →Data Storage Converter (KB, MB, GB, TB)
Convert bytes, KB, MB, GB, TB and their 1024-based KiB, MiB, GiB cousins.
Open tool →Week Number Calculator
Find the ISO-8601 week number of any date.
Open tool →What Day of the Week Was It?
Find the weekday of any date — past or future — plus day of the year.
Open tool →Countdown to a Date
A live countdown in days, hours, minutes and seconds to any moment.
Open tool →Hours & Minutes Calculator
Add and subtract times like 1:45 + 2:30 − 0:15.
Open tool →BMR & Daily Calorie Calculator
Estimate calories burned at rest and to maintain your weight.
Open tool →Simple Interest Calculator
Interest on a principal at a flat rate — no compounding.
Open tool →Split the Bill Calculator
Split a restaurant bill with tip evenly between friends.
Open tool →URL Parser & Query String Viewer
Break a URL into protocol, host, path, hash and decoded parameters.
Open tool →PX to REM Converter
Convert CSS pixels to rem and back, with a quick reference table.
Open tool →Chmod Permissions Calculator
Convert Unix file permissions between checkboxes, octal and rwx.
Open tool →Number to Words Converter
Write numbers out in English words — for cheques, contracts and invoices.
Open tool →Why these tools are different
Most "free" tool sites ask you to upload your file to their servers, then show you a watermark, a queue or a paywall. Ours work the other way round: the code comes to your device, and your document stays put. You can switch your internet off after a page loads and most tools will still work.
Every tool page also includes a plain-English guide written by The Curator team — what the tool does, the formula or method behind it, its limits, and answers to common questions — so you understand the result, not just receive it.
PDF tools
PDF is the closest thing the internet has to digital paper. A PDF file describes every page as a fixed canvas, which is why it looks the same on a phone, a laptop and a printer. That fixed layout is also why PDFs are awkward to edit: the format was designed to preserve a page, not to rearrange it.
Image tools
Most image problems come down to three things: the format (JPG, PNG, WebP), the pixel dimensions, and the compression level. JPG is great for photos because it discards detail the eye barely notices. PNG is lossless and supports transparency, which makes it ideal for logos, screenshots and diagrams. WebP is a newer format from Google that is usually smaller than both, but some older apps still refuse to open it.
Text & writing tools
Writers, students, marketers and developers spend a surprising amount of time doing mechanical things to text: counting words for a brief, fixing an accidental caps-lock paragraph, removing duplicate lines from an export, or spotting what changed between two drafts. None of these tasks need artificial intelligence — they need a precise, predictable tool.
Money & business tools
Financial calculators are only useful if you understand the formula behind them. Each calculator on this page shows its working: the inputs it uses, the standard formula it applies, and what the result does and does not include. A mortgage figure that ignores property tax, or an ROI that ignores time, can be technically correct and still misleading.
Developer tools
Developer utilities are some of the most-searched tools online because everyone who touches code needs them, and they are usually needed right now: a minified API response to read, a Base64 string to decode, a token to inspect, a regular expression to debug. The risk with many online versions is that you paste secrets — API keys, tokens, customer data — into a server you know nothing about.
Everyday tools
Some questions come up again and again: how old is someone exactly, how many days until a deadline, what day of the week was a date. They are easy to get slightly wrong by hand because months have different lengths and leap years move the goalposts.
Free means free: no sign-up, no limits, no watermarks. The site is supported by advertising on these guide pages. Spotted a bug or want a tool added? Tell us.