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Free Online Tools for Text, Images, SEO, Developers and Calculators

Browse 150+ browser-based tools for text, images, developers, SEO, finance, date, and unit conversion tasks. Search quickly, open a tool, and use it without signing up.

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Free Online Text Tools

Category

WWord CounterCount words, characters, lines, and paragraphs for writing and editing tasks.Text Statistics

TText Diff CheckerCompare two pieces of text and find line-by-line differences.Text Comparison

AAdd Prefix SuffixAdd a prefix or suffix to each line of text.Text Formatting

CChinese Number to ArabicConvert Chinese number text into Arabic numerals.Text Conversion

CChinese Punctuation ConverterConvert punctuation styles used in Chinese text.Text Conversion

EEmail ExtractorExtract email addresses from pasted text and remove duplicates.Text Extraction

FFind Replace TextFind matching text and replace it in a document or list.Text Cleaning

FFullwidth Halfwidth ConverterConvert text between full-width and half-width characters.Text Conversion

IInvisible Character RemoverRemove hidden characters from copied text.Text Cleaning

LLine CounterCount the number of lines in pasted text.Text Statistics

MMarkdown Table GeneratorTurn rows of text into a Markdown table.Text Formatting

NNumber ExtractorExtract numeric values from pasted text.Text Extraction

NNumber to Chinese UppercaseConvert a number into formal Chinese uppercase numerals.Text Conversion

PPhone Number ExtractorFind phone-number patterns in pasted text.Text Extraction

RRemove AccentsRemove accent marks from letters in text.Text Cleaning

RRemove Duplicate LinesRemove repeated lines from text lists while keeping a clean output.Text Cleaning

RRemove Extra Spaces Line BreaksClean repeated spaces and unnecessary line breaks from text.Text Cleaning

SSmart Quotes RemoverReplace curly quotation marks with straight quotes.Text Cleaning

SSort Lines AlphabeticallySort text lines alphabetically.Text Sorting

TText Column ExtractorExtract a selected column from lines of text.Text Extraction

TTraditional Simplified ConverterConvert Chinese text between Traditional and Simplified characters.Text Conversion

UURL ExtractorExtract URLs and links from pasted text into a clean list.Text Extraction

Free Unit and Utility Converters

Category

QQR Code GeneratorCreate a QR code from text or a URL and download it as an image.Everyday Utilities

AAngle ConverterConvert angles between degrees, radians, and other units.Common Unit Converters

AArea ConverterConvert area measurements between common units.Common Unit Converters

CClothing Size ConverterCompare clothing sizes across regional sizing systems.Size & Shopping Converters

DData Transfer Rate ConverterConvert data transfer rates between common units.Common Unit Converters

DDensity ConverterConvert density measurements between common units.Common Unit Converters

DDigital Storage ConverterConvert digital storage amounts between common units.Common Unit Converters

EEnergy ConverterConvert energy measurements between common units.Common Unit Converters

FFile Size ConverterConvert file sizes between bytes and larger storage units.Common Unit Converters

FForce ConverterConvert force measurements between common units.Common Unit Converters

FFuel Cost CalculatorEstimate trip fuel cost from distance, consumption, and fuel price.Travel Converters

FFuel Efficiency ConverterConvert fuel economy values between common units.Common Unit Converters

HHeight ConverterConvert height between centimeters, feet, and inches.Size & Shopping Converters

LLength ConverterConvert length measurements between common units.Common Unit Converters

LLuggage Size Sum CalculatorAdd luggage dimensions to check the combined size.Travel Converters

PPing / Square Feet / Square Meter ConverterConvert property area between ping, square feet, and square meters.Property Converters

PPower ConverterConvert power measurements between common units.Common Unit Converters

PPressure ConverterConvert pressure readings between common units.Common Unit Converters

RRing Size ConverterCompare ring sizes across regional sizing systems.Size & Shopping Converters

SShoe Size ConverterCompare shoe sizes across regional sizing systems.Size & Shopping Converters

SSpeed ConverterConvert speeds between common units.Common Unit Converters

TTemperature ConverterConvert temperatures between Celsius, Fahrenheit, and Kelvin.Common Unit Converters

TTip CalculatorCalculate a tip and total bill from a percentage.Everyday Utilities

TTorque ConverterConvert torque measurements between common units.Common Unit Converters

UUnit ConverterConvert common length, weight, and temperature units in one place.Common Unit Converters

VVolume ConverterConvert volume measurements between common units.Common Unit Converters

WWeight ConverterConvert weight and mass measurements between common units.Common Unit Converters

Free Date and Time Tools

Category

AAge CalculatorFind age in years, months, and days from a birth date and check the next birthday.Date Calculators

BBusiness Days Add Subtract CalculatorAdd or subtract working days while accounting for weekends.Workday Tools

BBusiness Days CalculatorCount business days between two dates with weekend and custom holiday options.Workday Tools

CCountdown Days CalculatorCount the days remaining until a selected date.Date Calculators

DDate Add Subtract CalculatorAdd or subtract days, months, or years from a date.Date Calculators

DDate Difference CalculatorCalculate the number of days and simplified time difference between two dates.Date Calculators

DDay Of Week CalculatorFind the weekday for a selected date.Date Calculators

DDay Of Year CalculatorFind a date's numbered day within the year.Date Calculators

LLeap Year CalculatorCheck whether a year is a leap year.Date Calculators

TTime CalculatorAdd or subtract time values and durations.Time Tools

TTime Duration ConverterConvert durations between common time units.Time Tools

TTime Unit ConverterConvert durations between seconds, minutes, hours, and days.Time Tools

TTimezone ConverterCompare a date and time across selected time zones.Timezone Tools

WWeek Number CalculatorFind the calendar week number for a date.Date Calculators

Free Online Developer Tools

Category

JJSON FormatterFormat, beautify, minify, and validate JSON for APIs, config files, and debugging.Formatters

BBase64 Encoder DecoderEncode text to Base64 and decode Base64 back to readable text.Encoders & Decoders

CCron Job GeneratorCreate a cron expression from scheduling choices.Generators

CCSS BeautifierFormat CSS rules with readable spacing and indentation.Formatters

CCSV to JSON ConverterConvert CSV rows into JSON for development, data cleanup, and testing.Data Converters

HHTML BeautifierFormat HTML markup with readable indentation.Formatters

HHTML Entity Encoder / DecoderEncode or decode HTML entities in text.Encoders & Decoders

JJavascript Minifier BeautifierFormat or minify JavaScript source text.Formatters

JJSON String Escape / UnescapeEscape or unescape JSON string characters.Encoders & Decoders

JJSON to CSV ConverterConvert JSON arrays or objects into CSV text for spreadsheets and data exchange.Data Converters

RRegex TesterTest a regular expression against sample text and review matches.Validators & Testers

SSQL FormatterFormat SQL statements for easier reading.Formatters

UUnix Permission CalculatorConvert Unix file permissions between symbolic and numeric forms.Generators

UURL Encoder DecoderEncode or decode URLs, query strings, and special characters.Encoders & Decoders

UUUID GeneratorGenerate UUID values for identifiers, tests, and sample data.Generators

XXML to JSON ConverterConvert XML data into a JSON representation.Data Converters

XXML ValidatorValidate XML syntax and find common parsing errors.Validators & Testers

Free SEO & Webmaster Tools

Category

OOpen Graph PreviewerPreview social link metadata and generate Open Graph meta tags.Structured Data Tools

SSchema Markup GeneratorGenerate basic JSON-LD structured data for common schema types.Structured Data Tools

RRobots.txt GeneratorCreate robots.txt crawl rules and sitemap references.SEO Generators

CCSS CompressorMinify CSS by removing unnecessary spacing and formatting.HTML Tools

FFavicon GeneratorCreate a favicon file from an image.HTML Tools

FFavicon Preview ToolPreview how a favicon appears at common icon sizes.HTML Tools

HHreflang Tag GeneratorCreate hreflang link tags for alternate language pages.SEO Generators

HHTML CompressorMinify HTML by removing unnecessary spacing and formatting.HTML Tools

HHTML to Text ConverterExtract readable text from HTML markup.HTML Tools

MMeta Tag GeneratorGenerate title, description, Open Graph, Twitter, and basic SEO meta tags.SEO Generators

UURL Slug GeneratorTurn titles and phrases into clean URL slugs.URL Tools

XXML Sitemap GeneratorCreate XML sitemap markup from a list of page URLs.SEO Generators

Hash & Checksum

Category

SSHA-256 Hash GeneratorGenerate a SHA-256 hash from text input.Hash Generators

MMD5 Hash GeneratorGenerate a MD5 hash from text input.Hash Generators

SSHA-512 Hash GeneratorGenerate a SHA-512 hash from text input.Hash Generators

Free Online Image Tools

Category

IImage CompressorReduce JPG, PNG, and WebP image file size in your browser.Image Optimization

IImage ResizerChange image width and height online for JPG, PNG, and WebP files.Image Optimization

RRotate Image OnlineRotate or flip JPG, PNG, WebP, and GIF images directly in your browser.Image Optimization

AAspect Ratio Preset GeneratorGenerate dimensions for a chosen aspect ratio.Image Size & Ratio

BBase64 to Image ConverterDecode Base64 image data into a viewable image.Image Conversion

CColor ConverterConvert color values between common formats.Color Tools

CCrop Image OnlineCrop images to a custom area or common ratio in your browser.Image Optimization

IImage Aspect Ratio CalculatorCalculate an image aspect ratio from width and height.Image Size & Ratio

IImage Color PickerSelect a color from an image and inspect its value.Color Tools

IImage Format ConverterConvert browser-readable images to JPG, PNG, or WebP locally.Image Conversion

IImage to Base64 ConverterEncode an image as a Base64 data string.Image Conversion

SScreen Aspect Ratio CalculatorCalculate a screen aspect ratio from its dimensions.Image Size & Ratio

Math Tools

Category

AAverage CalculatorCalculate the arithmetic mean of a set of numbers.Statistics

FFraction Decimal ConverterConvert values between fractions and decimals.Fractions

FFraction SimplifierReduce a fraction to its simplest form.Fractions

GGcd CalculatorFind the greatest common divisor of two or more numbers.Number Theory

LLcm CalculatorFind the least common multiple of two or more numbers.Number Theory

MMedian CalculatorFind the middle value of a sorted set of numbers.Statistics

MMode CalculatorFind the most frequent value in a set of numbers.Statistics

MModulo CalculatorFind the remainder after dividing one integer by another.Basic Math

PPercentage CalculatorCalculate percentages, percentage values, and percentage change.Basic Math

PPercentage Change CalculatorCalculate the percentage increase or decrease between two values.Basic Math

PPrime Factorization CalculatorBreak an integer into its prime factors.Number Theory

PPrime Number CheckerCheck whether an integer is prime.Number Theory

RRatio CalculatorCompare two values and simplify their ratio.Basic Math

RRoman Numerals ConverterConvert numbers between Arabic and Roman numerals.Number Conversion

SScientific Notation ConverterConvert numbers to or from scientific notation.Number Conversion

SSlope CalculatorCalculate the slope between two points.Geometry

SSquare Root CalculatorCalculate the square root of a number.Basic Math

SStandard Deviation CalculatorCalculate standard deviation for a set of numbers.Statistics

SSum CalculatorAdd a set of numbers to find the total.Basic Math

Free Finance Calculators

Category

CCompound Interest CalculatorEstimate how an initial amount grows with repeated interest over time.Loan & Interest

CCurrency ConverterConvert an amount between selected currencies using the available exchange rate.Currency & Forex

DDiscount CalculatorCalculate a sale price and the amount saved from an original price and discount.Basic Finance

GGross Margin CalculatorCalculate gross margin from revenue and cost of goods sold.Basic Finance

HHourly Wage CalculatorEstimate hourly wage from monthly salary and weekly working hours.Salary & Income

LLoan CalculatorEstimate a monthly loan payment from the amount borrowed, interest rate, and term.Loan & Interest

SSalary CalculatorEstimate annual salary and average monthly income from monthly pay, bonus, and extra months.Salary & Income

Free Marketing Calculators

Category

CCPA CalculatorCalculate cost per acquisition from advertising spend and conversions.Ad Metrics

CCPC CalculatorCalculate cost per click from advertising spend and total clicks.Ad Metrics

CCPM CalculatorCalculate the cost per thousand advertising impressions from spend and reach.Ad Metrics

CCTR CalculatorCalculate click-through rate from clicks and impressions.Ad Metrics

RROAS CalculatorCompare advertising revenue with spend to calculate return on ad spend.Ad Metrics

YYouTube Earnings CalculatorEstimate YouTube revenue from views and RPM for planning and comparison.Creator Calculators

Free Random Tools

Category

PPassword GeneratorGenerate random passwords with adjustable length and character options.Random Generators

RRandom Number GeneratorGenerate random numbers within a chosen range.Random Generators

RRandom PickerChoose one or more random items from a list.Picker & Sorting

RRandom SorterShuffle a list into a random order.Picker & Sorting

Health Calculators

Category

BBMI CalculatorCalculate BMI from height and weight and view an adult reference category.Body Calculators

Free Social Media Tools

Category

IInstagram Character CounterCount Instagram caption characters, hashtags, and mentions for social posts.Character Counters

IInstagram Image Size CalculatorCheck image dimensions against Instagram format sizes.Image Size Guides

SSocial Media Image Crop Size CalculatorCalculate crop dimensions for a social media image format.Image Size Guides

SSocial Media Image Size GuideLook up common image sizes and ratios for popular social platforms.Image Size Guides

TThreads Character CounterCount characters in a Threads post before publishing.Character Counters

YYouTube Thumbnail Size CheckerCheck whether an image size is close to common YouTube thumbnail recommendations.Image Size Guides

How to choose a tool

Search for a task or browse by category to find related tools. Text tools help with writing and cleanup, image tools prepare files for upload, developer tools handle JSON and encoding, and SEO tools help create metadata, robots.txt, schema, and previews.

Text tools Image tools Developer tools SEO tools