Free · No sign-up · Runs in your browser
Free online calculators and text tools
Free online calculators and text tools that run in your browser. Pick a calculator below, or paste your text, choose a button and copy the result. Nothing is uploaded.
- 95 free tools · calculators, text tools, converters and generators
- Nothing is uploaded · everything runs in your browser; your text never leaves your device
- No sign-up · no account, no email, no password
You type
You get
Characters: 0Words: 0Lines: 0
Keep proper nouns (built-in list on)
After Capitalized, Title and Sentence case, names such as London, NASA or iPhone and the word I get their capitals back instead of being lowercased.
Up to 200 words, saved in this browser only. Everyday words such as “may” and “march” are not in the built-in list, so add them here if you want them kept.
95 free tools
Popular calculators
See all calculators →- Mortgage Payment CalculatorChoose your country first, then work out your mortgage payment with that country's rules: Canadian semi-annual compounding and CMHC insurance, US taxes and PMI, UK repayment mortgages, Australian home loans or Indian EMIs.
- Income Tax Calculator (Canada)Enter your yearly employment income and your province to estimate your 2026 federal and provincial income tax, CPP, EI and take-home pay. It runs in your browser and nothing is stored.
- BMI CalculatorEnter your height and weight in metric or imperial units to see your body mass index, the category it falls in and the weight range that counts as normal for your height. Nothing you type is stored.
- Percentage CalculatorFill in the blanks and get the answer instantly, with the working shown. Find a percent of a number, a percentage increase or decrease, or the original amount. Free, and nothing is uploaded.
- Scientific CalculatorA free calculator you can tap or type on, with a basic mode and a scientific mode. Use brackets, powers, roots, trigonometry in degrees or radians, logarithms, factorials and percent, with a history of your last calculations.
- Age CalculatorPick a date of birth to see the exact age in years, months and days, the days until the next birthday, and the day of the week you were born. It works in your browser and nothing is uploaded.
All tools
Find the right tool, or open a category menu at the top.
Case Converters
- Convert CasePaste your text, then pick a case. Your text is converted instantly in your browser and is never uploaded or stored.
- UppercaseTurn every letter of your text into a capital letter. Handy for headings, labels and emphasis.
- LowercaseTurn every letter of your text into a small letter. Useful for fixing text typed with Caps Lock on.
- Title CaseFormat headlines, blog titles and book names in title case. Small words stay lowercase, except at the start and end.
- Sentence CasePut a capital letter at the start of each sentence and lowercase the rest. Great for fixing ALL CAPS text.
- Inverse CaseSwap the case of every letter in your text, so "Hello World" becomes "hELLO wORLD".
- camelCaseTurn phrases into camelCase variable names such as userFirstName. Each line is converted separately.
- PascalCaseTurn phrases into PascalCase names such as UserFirstName. Each line is converted separately.
- snake_caseTurn phrases into snake_case names such as user_first_name. Each line is converted separately.
- kebab-caseTurn phrases into lowercase, hyphen-separated names such as user-first-name. Each line is converted separately.
- CONSTANT_CASETurn phrases into capital letters joined by underscores, such as MAX_LOGIN_ATTEMPTS. Each line is converted separately.
- dot.caseTurn phrases into lowercase words joined with dots, such as user.first.name. Each line is converted separately.
- path/caseTurn phrases into lowercase words joined with slashes, such as user/first/name. Each line is converted separately.
- Train-CaseTurn phrases into capitalized words joined by hyphens, such as Content-Type or User-First-Name. Each line is converted separately.
- AP Title CaseFormat headlines the Associated Press way. Words of four letters or more get a capital; short articles, conjunctions and prepositions stay lowercase.
- APA Title CaseCapitalize titles of papers, articles and headings the APA way. Free, instant, and your text stays in your browser.
- Chicago / MLA Title CaseCapitalize titles the Chicago Manual of Style and MLA way. Articles, prepositions and coordinating conjunctions stay lowercase, whatever their length.
- camelCase to snake_casePaste camelCase or PascalCase names and turn them into snake_case, such as userFirstName to user_first_name. Each line is converted separately.
- snake_case to camelCasePaste snake_case or kebab-case names and turn them into camelCase, such as user_first_name to userFirstName. Each line is converted separately.
Text Tools
- Word CounterType or paste your text and see the counts update live. Nothing is uploaded or saved.
- Character CounterType or paste your text to count characters with and without spaces. Handy for tweets, SMS and meta descriptions.
- Line CounterPaste a list, a log or a piece of code to count its lines. Blank lines are counted separately from lines with text.
- Remove Duplicate LinesPaste a list with one item per line and delete the repeats. The first copy of each line is kept, in the original order.
- Sort LinesPaste a list with one item per line, then sort it A to Z, Z to A, by length, or flip the order.
- Remove Line BreaksJoin broken lines into one paragraph, delete blank lines or clean up extra spaces. Handy for text copied from PDFs and emails.
- Remove Extra SpacesSqueeze repeated spaces into one and trim the start and end of every line. Handy for text copied from PDFs, emails and spreadsheets.
- Remove AccentsStrip accent marks from letters so "Café Crème Brûlée" becomes "Cafe Creme Brulee".
- Find and ReplaceReplace every match of a word or pattern in your text. Choose match case, whole word or regular expressions.
- Text Diff CheckerPaste an original and a changed version to highlight exactly what was added and removed.
- Reverse TextFlip your text backwards in a click: reverse every letter, the order of the words, or each word on its own.
- Morse Code TranslatorType text to get Morse code, or paste Morse code to get text. The box works out which one you typed. Press play to hear it, with a flashing light, at the speed you choose. Nothing is uploaded.
- Text to SpeechPaste or type any text and hear it read aloud. Choose a voice, speed, pitch and volume. It uses the voices on your own device, so your text is never uploaded.
- Book FormatterUpload or paste your manuscript, fix typing problems in one click, choose a style, see real pages, check the print rules and download an EPUB or print-ready PDF. Your book never leaves your browser.
Calculators
- Mortgage Payment CalculatorChoose your country first, then work out your mortgage payment with that country's rules: Canadian semi-annual compounding and CMHC insurance, US taxes and PMI, UK repayment mortgages, Australian home loans or Indian EMIs.
- Mortgage Affordability CalculatorChoose your country, then enter your income, debts, other housing costs, down payment and the interest rate to see the home price a typical lender would allow, using that country's usual rules, including the Canadian stress test.
- Loan Payment CalculatorChoose your country, then enter the loan amount, interest rate and term to see your payment, the total interest, a balance chart and the yearly schedule. It works for car loans, personal loans and other equal-payment loans.
- Discount CalculatorEnter the original price and the percent off to see the sale price and how much you save. Add an extra discount or sales tax if you need to. Everything works in your browser.
- Tip CalculatorType the bill, pick a tip and say how many people are sharing. You get the tip, the total and each person's share straight away, all in your browser.
- Simple Interest CalculatorEnter an amount, a yearly interest rate and a length of time to see the interest and the total. Choose years, months or days. Everything works in your browser.
- Sales Tax, VAT and GST CalculatorChoose your country first, then add tax to a price or work out the price before tax: Canadian GST, HST, PST and QST, US state and local sales tax, UK VAT, Australian GST or Indian GST.
- Income Tax Calculator (Canada)Enter your yearly employment income and your province to estimate your 2026 federal and provincial income tax, CPP, EI and take-home pay. It runs in your browser and nothing is stored.
- Compound Interest CalculatorSee how savings or investments can grow when interest earns interest. Enter a starting amount, regular deposits, a yearly rate and the years, then read the final balance, a yearly chart and a year-by-year table.
- BMI CalculatorEnter your height and weight in metric or imperial units to see your body mass index, the category it falls in and the weight range that counts as normal for your height. Nothing you type is stored.
- Calorie CalculatorEnter your age, sex, height, weight and activity level to estimate how many calories your body uses each day, and what that means for losing, keeping or gaining weight. Your numbers stay in your browser.
- Ideal Weight CalculatorEnter your height to see ideal weight from the Devine, Robinson, Miller and Hamwi formulas, along with the weight range that gives a healthy BMI. Add your current weight to see how it compares.
- Water Intake CalculatorEnter your weight, how much you exercise and the weather to get a general estimate of how much to drink in a day, shown in litres and glasses. Everything runs in your browser.
- Body Fat CalculatorEstimate your body fat percentage from a tape measure using the US Navy method. See your category, a colour scale and, if you add your weight, your fat and lean mass. Nothing you type is stored.
- Target Heart Rate CalculatorEnter your age (and your resting heart rate if you know it) to see your estimated maximum heart rate, five training zones and the moderate and vigorous ranges used by health authorities.
- Pregnancy Due Date CalculatorEnter the first day of your last period or the date of conception to estimate your due date, see how many weeks pregnant you are today, which trimester you are in, and the dates of key milestones.
- One-Rep Max CalculatorEnter a weight you lifted and how many reps you did to estimate the most you could lift once. See seven formulas side by side and a table of training weights at each percentage.
- Running Pace CalculatorWork out your running pace, finish time or distance from the other two, in kilometres or miles. You also get speed, split times and predicted times for 5K, 10K, half marathon and marathon.
- Scientific CalculatorA free calculator you can tap or type on, with a basic mode and a scientific mode. Use brackets, powers, roots, trigonometry in degrees or radians, logarithms, factorials and percent, with a history of your last calculations.
- Percentage CalculatorFill in the blanks and get the answer instantly, with the working shown. Find a percent of a number, a percentage increase or decrease, or the original amount. Free, and nothing is uploaded.
- Percentage Difference CalculatorEnter two numbers to see how far apart they are, as a percentage of their average. The order does not matter. The working is shown, and everything runs in your browser.
- Fraction CalculatorAdd, subtract, multiply or divide two fractions or mixed numbers. You get the answer in lowest terms, as a mixed number, a decimal and a percentage, with the working shown.
- Ratio CalculatorSimplify a ratio such as 12 : 8, find the missing number in a proportion, or share an amount in a given ratio. You get the answer in lowest terms with the working shown, all in your browser.
- Average CalculatorType or paste a list of numbers and get the mean (the average), median, mode, range, sum and count straight away. Everything is worked out in your browser.
- Age CalculatorPick a date of birth to see the exact age in years, months and days, the days until the next birthday, and the day of the week you were born. It works in your browser and nothing is uploaded.
- Date Difference CalculatorPick two dates to see how many years, months, weeks and days lie between them, and how many of those days are weekdays. It works in your browser and nothing is uploaded.
- Time and Hours CalculatorFind how many hours you worked between a start and an end time, with an unpaid break and optional pay, or add and subtract lengths of time in days, hours, minutes and seconds.
- Time Zone ConverterPick a date and time in one place and see what the clocks show in other cities, with the day change and the difference in hours. Daylight saving time is applied for the date you choose. It runs in your browser and nothing is uploaded.
- Length ConverterType a length, choose the unit you have and the unit you want, and read the answer straight away, together with the same length in every other unit. It runs in your browser and nothing is uploaded.
- Weight ConverterType a weight, choose the unit you have and the unit you want, and read the answer straight away, together with the same weight in every other unit. It runs in your browser and nothing is uploaded.
- Area ConverterType an area, choose the unit you have and the unit you want, and read the answer straight away, together with the same area in every other unit. It runs in your browser and nothing is uploaded.
- Volume ConverterType a volume, choose the unit you have and the unit you want, and read the answer straight away, together with the same volume in every other unit. Cups, spoons, pints, quarts and gallons are US sizes, and the imperial gallon is listed too. It runs in your browser and nothing is uploaded.
- Speed ConverterType a speed, choose the unit you have and the unit you want, and read the answer straight away, together with the same speed in every other unit. It runs in your browser and nothing is uploaded.
- Temperature ConverterType a temperature, choose Celsius, Fahrenheit or Kelvin for the one you have and the one you want, and read the answer straight away. It runs in your browser and nothing is uploaded.
- Roman Numeral ConverterType a number to get the Roman numeral, or type a Roman numeral to get the number. It works both ways in one box, from 1 (I) to 3,999 (MMMCMXCIX). It runs in your browser and nothing is uploaded.
- Number to WordsType a number and read it written out in English words. Switch to Ordinal for first, second, third, or to Cheque for amounts such as one thousand two hundred thirty-four and 56/100 dollars. It runs in your browser and nothing is uploaded.
Image Tools
- Image ConverterConvert pictures between JPG, PNG and WebP. Add one or many, choose the format, and download. Your pictures are processed in your browser and never uploaded.
- PNG to JPGTurn PNG pictures into smaller JPG files in one step. Your pictures are processed in your browser and never uploaded.
- JPG to PNGTurn JPG pictures into lossless PNG files in one step. Your pictures are processed in your browser and never uploaded.
- WebP to JPGTurn WebP pictures into JPG files that open everywhere. Your pictures are processed in your browser and never uploaded.
- Compress ImageMake your pictures much smaller without making them look worse. Pick a preset, set the quality, or compress to an exact size like 200 KB, then compare before and after. Your pictures are processed in your browser and never uploaded.
- Resize ImageChange the size of your pictures by width, height, percent or exact pixels, fit them in a box, or fill a shape such as an Instagram post. Pick a quick size, check the result and download. Your pictures are processed in your browser and never uploaded.
- Crop ImageCut your picture down to the part you want. Drag the frame, pick a shape, or type exact pixels. Your pictures are processed in your browser and never uploaded.
- Image to Base64Turn a picture into Base64 text you can paste into HTML or CSS, or turn Base64 text back into a picture. Your pictures are processed in your browser and never uploaded.
Developer Tools
- JSON FormatterPaste JSON to pretty-print it, check that it is valid, shrink it to one line, or sort its keys.
- Base64 Encode / DecodeConvert text to Base64 and Base64 back to text. UTF-8, emoji and URL-safe Base64 are all supported.
- URL Encode / DecodeEncode special characters so they work inside a web address, or decode an encoded link back to plain text.
- HTML Encode / DecodeTurn special characters into HTML entities so they show as text on a web page, or decode entities back to readable characters.
- Text to SlugTurn a title like "Café Menu & Prices!" into a clean web address part like cafe-menu-prices. Each line becomes its own slug.
- Text to BinaryTurn text into binary (0s and 1s), or paste binary to read it as normal text. Each character is written as 8-digit bytes.
- MD5 Hash GeneratorCalculate the MD5 hash of text or a file. Good for checksums; not safe for passwords or security.
- SHA-1 Hash GeneratorCalculate the SHA-1 hash of text or a file. Useful for checksums and legacy systems; not recommended for new security uses.
- SHA-256 Hash GeneratorCalculate the SHA-256 hash of text or a file. Choose hex or Base64 output and compare against an expected hash.
- SHA-512 Hash GeneratorCalculate the SHA-512 hash of text or a file. Choose hex or Base64 output and compare against an expected hash.
- UUID GeneratorCreate one UUID or thousands. Choose random version 4 or time-ordered version 7, set the style, then copy them or download a text file. Paste any UUID to see its version. Everything is made in your browser.
- Unix Timestamp ConverterConvert a Unix timestamp (epoch time) to a date and a date to a timestamp, in seconds, milliseconds, microseconds or nanoseconds. See the current Unix time ticking live. Everything runs in your browser.
- Color ConverterType a color in any format, such as a HEX code, rgb() or hsl(), or pick one, and see it in every format with a copy button. Check the contrast against white and black for accessibility. It runs in your browser.
Generators
- Password GeneratorCreate a strong, random password in one click. Choose the length and character types, then copy it.
- QR Code GeneratorTurn a web address or any text into a QR code. Optionally pick a dot pattern, corner style, colours, a frame and your logo, then download a PNG or a sharp SVG for printing.
- UTM Link BuilderAdd tracking to a link so you can see in Google Analytics where visitors came from. Fill in the source, medium and campaign, copy the link, or turn it into a QR code. It runs in your browser.
- Lorem IpsumCreate placeholder text for designs and mock-ups. Choose how many paragraphs, sentences or words you need.
- Fancy Text GeneratorType your text and see it in 17 styles: bold, cursive, gothic, bubble, upside down and more. Copy the one you like.
How it works
Three steps. No setup.
- 1
Paste or type
Drop in your text, or pick a calculator and enter your numbers.
- 2
Pick a button
Change the case, count, sort, clean or calculate. The answer appears instantly.
- 3
Copy the result
Copy it, or download it. Nothing is uploaded and nothing is saved.
Why Convert4Me
Small tools, done properly
Private by design
Everything runs in your browser. The text and files you use never leave your device, so there is nothing to leak.
Instant
Results appear as you click or type. No waiting, no page reloads.
95 free tools
Case converters, text tools, calculators, developer tools and generators.
Add it to your phone
Install it from your browser menu and open it like an app, with its own icon.
A free API for developers
Every tool is also one GET request: JSON back, no key, no sign-up, CORS open. Try each endpoint with your own data.
Explore the API →
Everything in one place
Pick a family
- Case ConvertersChange capital and small letters19 tools
- Text ToolsCount, clean, sort and compare text14 tools
- CalculatorsPercentages, dates, tips and more36 tools
- Image ToolsConvert, compress, resize and crop pictures8 tools
- Developer ToolsEncode, hash and format data13 tools
- GeneratorsCreate passwords, QR codes and more5 tools
For developers
Every tool is one request away
Call any tool from your own code: one GET request, a JSON answer, no API key and no sign-up. Open the docs to try each endpoint with random or your own data, and copy the code for cURL, JavaScript or Python.
Request
curl -G 'https://api.convert4me.com/api/v1/title-case' \
--data-urlencode 'text=the lord of the rings'Response · 200
{
"ok": true,
"tool": "title-case",
"action": "title",
"result": "The Lord of the Rings"
}Your text. Your device. Instantly.
Paste something and see what the tools can do. It is free, it needs no account, and it stays on your device.