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Showing all 122 tools.

Map Area & Perimeter Calculator

Draw a boundary on a map to measure area in acres, hectares or square feet and calculate its perimeter.

Distance Between Two Points

Measure the distance between two map points or GPS coordinates in miles, kilometers, meters or nautical miles.

GPS Coordinate Converter

Convert latitude and longitude between decimal degrees and degrees, minutes and seconds.

Map Radius Calculator

Draw a radius circle around a map location in miles, kilometers or meters.

Subnet Calculator

Work out network, broadcast, host range and mask from any IPv4 CIDR.

IP Base Converter

Convert an IPv4 address between dotted-decimal, integer, hex and binary.

What Is My IP

Show the IP address your connection presents to our server, IPv4 or IPv6.

DNS Lookup

Resolve A, AAAA, MX, TXT, NS and CNAME records for a domain.

IPv6 Subnet Calculator

Work out the network, host range and address count for any IPv6 prefix.

User-Agent Parser

Break a User-Agent string into browser, engine, OS, device and bot details.

Base64 Encode / Decode

Encode text to Base64 or decode it back, with URL-safe and Unicode support.

URL Encode / Decode

Percent-encode or decode text for use in URLs and query strings.

JSON String Escape / Unescape

Escape text for a JSON string, or unescape a JSON string back to plain text.

Text to Binary & Hex Converter

Convert text to binary, hex or decimal bytes, or decode bytes back to text.

JWT Decoder

Decode a JSON Web Token's header and payload without verifying the signature.

JWKS Key Set Viewer

Decode a JWKS key set — kid, kty, alg, use, key_ops, x5c chains — and convert JWK ↔ PEM.

Basic Auth Header Generator

Build an Authorization: Basic header (RFC 7617), or decode one back to user and password.

Password Generator

Generate a strong random password or passphrase, with its entropy in bits.

JWT Generator

Sign a JWT with HS256 in your browser — custom claims, expiry and iat.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of text.

Hash Identifier

Identify the likely algorithm behind a hash from its format and length.

CVSS Calculator

Score a vulnerability with CVSS v3.1 or v4.0 base metrics, or decode a vector string.

X.509 Certificate Decoder

Decode a PEM certificate to read its subject, issuer, validity, SANs and fingerprints.

Bcrypt Generator & Verifier

Hash a password with bcrypt or check a password against a bcrypt hash — in your browser.

TOTP Code Generator

Generate live 2FA codes from a base32 secret, with countdown, drift checking and otpauth:// parsing.

CSR Decoder

Decode a PKCS#10 certificate signing request to check its subject and SANs before you submit it.

HMAC Generator

Compute an HMAC over a message with a secret key using SHA-1, SHA-256, SHA-384 or SHA-512.

Email Header Analyzer

Parse email headers to trace the Received chain and read the SPF, DKIM and DMARC verdicts.

File Checksum Verifier

Hash a downloaded file with MD5 or SHA and compare it against the published checksum.

Password Entropy Calculator

Estimate a password's entropy in bits from its length and character set, with a crack-time ballpark.

security.txt Generator

Build a valid /.well-known/security.txt file (RFC 9116) from a short form.

SSVC Calculator

Prioritize a vulnerability with the CISA SSVC decision tree — Track, Track*, Attend or Act.

Content-Security-Policy Analyzer

Parse a Content-Security-Policy header into its directives and flag weak or missing protections.

Content-Security-Policy Generator

Compose a Content-Security-Policy from directives and get the header value plus Nginx, Apache and Next.js snippets.

SafeLinks & URL Wrapper Decoder

Recover the original URL from a Microsoft SafeLinks, Proofpoint or Barracuda rewritten link.

JSON-LD Schema Generator

Build schema.org JSON-LD for Article, FAQ, Breadcrumb, Organization, LocalBusiness and Product.

JSON-LD Validator

Check JSON-LD syntax and selected structure and Google-feature rules for six schema.org types.

Meta Tag Generator

Generate the title, description, canonical, Open Graph and Twitter Card tags for a page's <head>.

SERP Snippet Preview

Preview how a page's title and description render in Google results, with pixel-width truncation.

UTM Link Builder

Add utm_source, utm_medium, utm_campaign and more to a URL for campaign tracking.

Sitemap URL Extractor

Fetch a sitemap and extract every URL in it as a clean list.

robots.txt Generator & Tester

Build a robots.txt file and test whether a URL is allowed, using Google's real matching rules.

URL SEO Audit

Fetch a page and check its title, meta description, canonical, robots directives, Open Graph tags, headings and status code.

Redirect Checker

Follow a URL's redirect chain and see every hop with its status code and response headers.

Link Preview Tester

Fetch a URL and preview how its link unfurls on X, Slack, Discord, Facebook and LinkedIn.

JSON Formatter

Pretty-print, minify and validate JSON, with the line and column of any syntax error.

JSON Schema Validator

Validate a JSON document against a Draft 2020-12 schema, with precise paths for every issue.

Regex Tester

Test a JavaScript regular expression against sample text with live match highlighting.

UUID Generator

Generate v1-v7 UUIDs (RFC 9562) or decode any UUID's version, variant and timestamp.

Cron Expression Parser

Explain a cron expression in plain English and show the next run times.

YAML / TOML Converter

Convert data between JSON, YAML and TOML, with line-and-column errors when input won't parse.

URL Parser

Break a URL into protocol, host, port, path, query parameters and fragment.

Lorem Ipsum Generator

Generate classic lorem ipsum filler text as paragraphs, sentences, words or list items.

JSON to TypeScript

Turn a JSON document into TypeScript interfaces, with optional fields and unions.

SQL Formatter

Pretty-print SQL with dialect-aware keywords, indent and case options.

HTML Entity Encoder / Decoder

Escape text to HTML entities or decode them back, with two escape levels.

Chmod Calculator

Convert between octal (755) and symbolic (rwxr-xr-x) permissions, with special bits and umask.

Code Beautifier

Reformat HTML, CSS, JavaScript, TypeScript, JSON or Markdown with Prettier, entirely in your browser.

JSON Diff

Compare two JSON documents structurally and see added, removed and changed keys — order-independent.

XML Formatter

Pretty-print or minify XML, with the line and column of any parse error.

XML / JSON Converter

Convert XML to JSON or JSON to XML, with attributes and text nodes preserved.

docker run to Compose

Turn a long `docker run` command into an equivalent docker-compose.yml service.

px / rem Converter

Convert between px and rem for a given root font size, with a quick reference table.

Case Converter

Convert text between camelCase, snake_case, kebab-case, Title Case and more.

Word & Character Count

Count words, characters, sentences, paragraphs and estimated reading time.

Character Counter

Count characters with and without spaces and check text against X, SMS and meta-description limits.

Remove Duplicate Lines

Delete repeated lines from a list and keep the first of each.

Sort Lines Alphabetically

Sort a list of lines A–Z, Z–A, naturally, by number or by length.

Text Repeater

Repeat any text or emoji a set number of times with a separator.

Slugify

Turn any title into a clean, URL-safe slug.

Text Diff

Compare two blocks of text and highlight what changed.

Markdown Preview

Write Markdown with a live preview, side by side or stacked.

Aspect Ratio Calculator

Solve the missing width, height or ratio, reduce W:H to lowest terms and scale to fit.

Color Converter

Convert a color between HEX, RGB, HSL and OKLCH.

Color Contrast Checker

Check a text and background color pair against the WCAG 2.1 contrast thresholds, with a nearest-passing suggestion.

CSS Gradient Generator

Build a linear or radial CSS gradient with multiple color stops and copy the code.

CSS Box Shadow Generator

Dial in offset, blur, spread, color and inset for one or more box-shadows and copy the CSS.

CSS Border Radius Generator

Set each corner radius independently, including elliptical corners, and copy the border-radius CSS.

Gas Mark Converter

Convert oven temperatures between gas mark, °C, °F and fan °C.

Kilograms to Pounds

Convert kilograms to pounds instantly, or swap to convert pounds to kilograms.

Centimeters to Inches

Convert centimeters to inches instantly, or swap to convert inches to centimeters.

Celsius to Fahrenheit

Convert Celsius to Fahrenheit instantly, or swap to convert Fahrenheit to Celsius.

Millimeters to Inches

Convert millimeters to inches instantly, or swap to convert inches to millimeters.

Kilometers to Miles

Convert kilometers to miles instantly, or swap to convert miles to kilometers.

Milliliters to Fluid Ounces

Convert milliliters to fluid ounces instantly, or swap to convert ounces to milliliters, in US or UK units.

Liters to Gallons

Convert liters to gallons instantly, or swap to convert gallons to liters, in US or UK units.

Meters to Feet

Convert meters to feet instantly, or swap to convert feet and inches to meters.

Unit Converter

Convert length, mass, temperature, data size and more.

Cups to Grams & Grams to Cups

Convert cups to grams (and back) for common baking ingredients, with a US/metric cup toggle.

Timestamp Converter

Convert between Unix timestamps and human-readable dates in any timezone.

Military Time Chart & Converter

Convert military (24-hour) time to standard 12-hour time — and back.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers, from 1 to 3999.

CSV / JSON Converter

Convert CSV to JSON or JSON to CSV, with delimiter auto-detection and correct quoting.

Date Calculator

Count the days between two dates, add or subtract time from a date, or measure hours between two times.

Image Compressor

Compress images to JPEG or WebP with optional target KB size, quality and dimension controls.

QR Code Generator

Turn text, a WiFi network or a contact card into a downloadable QR code.

EXIF Remover

Strip EXIF, GPS location, XMP and IPTC metadata from JPEG or PNG — losslessly.

Number Base Converter

Convert an integer between binary, octal, decimal, hex and any base 2–36.

Image Format Converter

Convert an image to PNG, JPEG or WebP — entirely on your device.

Timezone Converter

Convert a date and time between time zones, with DST and a day-shift marker.

HTML to Markdown

Convert HTML to Markdown by pasting it or fetching a page by URL.

Age Calculator

Work out an exact age in years, months and days from a birth date, plus the countdown to the next birthday.

Days Until Calculator

Count down the days, weeks and months until any future date.

Paint & Wallpaper Coverage Calculator

Estimate wall paint in gallons or liters, or wallpaper rolls with repeat and trimming allowances.

Discount & Sale Price Calculator

Work out a sale price from an original price and a discount percentage, or the percentage off between two prices.

BMI Calculator

Work out Body Mass Index from height and weight, in metric or imperial, with the standard adult category.

Dog & Cat Age Calculator

Dog age calculator: convert a dog or cat's age into human years, with dog aging rate adjusted for adult size.

Percentage Calculator

Find percentages, percentage change or difference, and increase or decrease a value by a percentage.

Fraction Calculator

Add, subtract, multiply and divide fractions and mixed numbers, then see the answer in lowest terms with the steps.

GCF Calculator

Find the greatest common factor of two or more whole numbers, with exact answers and worked steps.

Mean, Median, Mode & Standard Deviation

Find the mean, median, mode, range, quartiles and standard deviation of a list of numbers, with the working shown.

VAT / Sales Tax Calculator

Add a tax percentage to a net price, or back it out of a gross price to find the net and tax.

Tip & Bill Split Calculator

Work out the tip on a bill and split the total evenly across any number of people.

Loan & Mortgage Calculator

Find the monthly payment, total interest and full amortization schedule for a fixed-rate loan.

Compound Interest Calculator

Project the future value of a balance with regular contributions, any compounding frequency, and a year-by-year breakdown.

Sleep Cycle Calculator

Compare four approximate bedtime or wake-time options using assumed 90-minute sleep cycles.

Wheel Spinner

Spin a wheel of names or options to pick a random winner, with equal odds for every entry.

Random Number Generator

Pick one or many random whole numbers in any range, with optional no-repeats and sorting.

Dice Roller

Roll virtual dice from d4 to d100, or any dice notation like 2d6+3 and 4d6kh3.

Coin Flip

Flip a fair coin for heads or tails, or flip up to 1,000 coins and see the counts and streaks.

Random Team Generator

Split a list of names into random, evenly sized teams, by number of teams or people per team.

Fancy Text Generator

About the catalog

Every tool on toolsforweb.com, in one place. The catalog covers network math, encoders and decoders, security checks, SEO auditing, text cleanup, converters and everyday calculators — 122 tools ready to use right now, each on its own page with the full details. Filter the list above by name, keyword or category, or open any tool directly from the annotated index.

Speed and privacy are the point. Most tools do all of their work locally in your browser — the text, numbers and files you enter are processed on your device and never sent anywhere, so nothing is stored, logged or waiting to leak. The few tools that need a server say so plainly on their pages and send only the input required for your result.

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