Browser tools
Small utilities that remove friction from your workflow.
Run practical developer and everyday calculators locally in your browser. No account, no upload, no detour.
JSON Formatter
Turn compact or difficult-to-read JSON into clean, indented JSON you can inspect and copy.
Open toolJSON Validator
Check whether JSON is valid and get a readable error message when the structure is not.
Open toolJSON Minifier
Remove unnecessary JSON whitespace while keeping the data valid and ready for transport.
Open toolJWT Decoder
Inspect the header and payload of a JSON Web Token locally without verifying its signature.
Open toolBase64 Encoder
Encode text as Base64 in your browser for quick debugging, testing, and data exchange tasks.
Open toolBase64 Decoder
Decode Base64 text locally and inspect the original readable value without uploading it.
Open toolURL Encoder
Encode query values and URL fragments safely for links, APIs, and browser requests.
Open toolURL Decoder
Decode percent-encoded URLs and query values into text that is easier to inspect.
Open toolUUID Generator
Generate unique UUID v4 values for tests, records, prototypes, and development workflows.
Open toolTimestamp Converter
Convert Unix timestamps and readable dates to compare logs, API values, and event times.
Open toolPassword Generator
Create strong random passwords with the length and character groups you choose.
Open toolSHA-256 Hash Generator
Create a SHA-256 hash from text in your browser for checksums and debugging.
Open toolColor Converter
Convert colors between HEX, RGB, and HSL with a live visual preview.
Open toolColor Contrast Checker
Check text and background colors against WCAG contrast guidance with a readable preview.
Open toolRegex Tester
Test a regular expression against sample text and inspect every match clearly.
Open toolText Case Converter
Switch text between sentence case, lower case, upper case, title case, and kebab case.
Open toolWord and Character Counter
Count words, characters, lines, sentences, and reading time while you edit.
Open toolLorem Ipsum Generator
Generate placeholder paragraphs with the length you need for a layout or prototype.
Open toolMarkdown Preview
Write Markdown and see a clean live preview for notes, README files, and documentation.
Open toolHTML Encoder
Escape text for safe placement inside HTML attributes and content.
Open toolHTML Decoder
Turn HTML entities back into readable text for debugging and content cleanup.
Open toolCSV to JSON Converter
Convert comma-separated rows into readable JSON objects with the first row as headers.
Open toolJSON to CSV Converter
Turn an array of JSON objects into a spreadsheet-friendly CSV file.
Open toolXML Formatter
Indent XML so nested elements are easier to inspect, compare, and debug.
Open toolQuery String Parser
Parse a URL or query string into a clear list of parameter names and values.
Open toolQuery String Builder
Build an encoded query string from simple name and value pairs.
Open toolDate Difference Calculator
Find the exact difference between two dates in days, weeks, months, and years.
Open toolAge Calculator
Calculate an exact age from a birth date and see the next birthday countdown.
Open toolTime Zone Converter
Compare a local date and time across common global time zones without mental arithmetic.
Open toolPercentage Calculator
Work out percentages, percentage change, and the original value from a percentage.
Open toolTip Calculator
Split a bill fairly with a tip percentage and the number of people paying.
Open toolLength Unit Converter
Convert common length units instantly between metric and imperial measurements.
Open toolBMI Calculator
Calculate body mass index from height and weight, with the result shown clearly.
Open toolLoan Payment Calculator
Estimate monthly payments, total interest, and total repayment for a fixed-rate loan.
Open toolCompound Interest Calculator
See how an initial amount and regular contributions can grow over time.
Open toolRandom Number Generator
Generate one or many random whole numbers inside the range you choose.
Open toolList Sorter
Sort a list alphabetically or numerically and remove blank lines in one step.
Open toolDuplicate Line Remover
Remove repeated lines while preserving the first occurrence and original order.
Open toolURL Slug Generator
Turn a title into a clean lowercase URL slug that is easy to read and share.
Open toolText Repeater
Repeat a short piece of text the exact number of times you need, with a chosen separator.
Open toolUnix Permission Calculator
Translate symbolic file permissions into an octal value and back again.
Open toolIPv4 Subnet Calculator
Calculate network address, broadcast address, host range, and usable host count.
Open toolCron Expression Helper
Explain the five fields in a cron expression and show the schedule in plain English.
Open toolHTTP Status Code Lookup
Look up a common HTTP status code and get its meaning plus a practical next step.
Open toolCSS Gradient Generator
Pick two colors and an angle to generate copy-ready CSS for a linear gradient.
Open toolData Size Converter
Convert bytes between decimal and binary units such as KB, MB, MiB, and GiB.
Open toolJSON Path Helper
Read a nested value from JSON with a simple dot path such as user.profile.name.
Open toolBase64 File Helper
Select a local file to encode it as Base64 or download decoded Base64 as a file.
Open toolSQL Formatter
Format a SQL query into readable clauses and indentation for review, debugging, and documentation.
Open toolSQL Minifier
Remove unnecessary SQL whitespace for compact logs, test fixtures, and transport without changing the query text.
Open toolJSON to YAML Converter
Convert JSON objects and arrays into readable YAML for configuration files, documentation, and review.
Open toolYAML to JSON Converter
Convert common YAML mappings and lists into JSON for APIs, scripts, and validation workflows.
Open toolJSON Escape and Unescape
Escape text for a JSON string or decode an escaped JSON string while preserving quotes and newlines.
Open toolRegex Escape Tool
Escape punctuation in a literal search phrase so it can be used safely inside a regular expression.
Open toolRegex Replace Tester
Test a regular-expression replacement against sample text and inspect the transformed result before coding it.
Open toolText Diff Checker
Compare two text blocks locally and see added, removed, and unchanged lines in a compact review.
Open toolLine Ending Converter
Convert text between LF, CRLF, and CR line endings to prevent cross-platform script and data problems.
Open toolNumber Base Converter
Convert integers between binary, octal, decimal, and hexadecimal for programming and systems work.
Open toolHTTP Header Parser
Turn copied HTTP headers into a readable list so you can inspect caching, content type, auth, and security behavior.
Open toolURL Parser
Break a URL into protocol, host, port, path, query parameters, and hash components for debugging and documentation.
Open toolHTML Preview
Preview a small HTML fragment in an isolated local frame while checking structure, text, and basic styling.
Open toolMarkdown Table Generator
Turn comma-separated headers and rows into a clean Markdown table for README files and documentation.
Open toolCSS Box Shadow Generator
Create a restrained CSS box-shadow declaration by adjusting offset, blur, spread, color, and inset mode.
Open toolCSS Clamp Generator
Generate a responsive CSS clamp() value from minimum, preferred, and maximum sizes for fluid layouts.
Open toolColor Palette Generator
Create a balanced light-to-dark palette from one base color for interfaces, charts, and design systems.
Open toolPassword Strength Checker
Evaluate password length and character variety locally, with practical guidance for creating stronger credentials.
Open toolHMAC Generator
Generate an HMAC digest from a message and secret in the browser for webhook and API signing tests.
Open toolSHA-1 Hash Generator
Create a SHA-1 digest from text locally for legacy compatibility checks and debugging, not password storage.
Open toolJWT Generator for Local Tests
Create an unsigned JWT-shaped token from a header and payload for local parser tests. Never use it for authentication.
Open toolEmail Address Validator
Check an email address for common formatting issues before sending it to an API or form.
Open toolBusiness Days Calculator
Count weekdays between two dates and estimate delivery or project timing without counting weekends.
Open toolAdd or Subtract Dates
Add or subtract days, weeks, or months from a date to plan deadlines, renewals, and follow-up tasks.
Open toolDiscount Calculator
Calculate sale price, savings, and optional tax from an original price and discount percentage.
Open toolFuel Cost Calculator
Estimate trip fuel cost from distance, vehicle efficiency, and fuel price in metric or imperial units.
Open toolRunning Pace Calculator
Calculate running pace, speed, or finish time from distance and duration using metric or imperial distance units.
Open toolGPA Calculator
Calculate a weighted grade-point average from course grades and credits using a transparent 4.0 scale.
Open toolBreak-Even Point Calculator
Find the units and revenue needed to cover fixed costs when you know price and variable cost per unit.
Open toolPercentage of Total Calculator
Calculate what percentage one value represents of a total, with a clear result for reports and everyday comparisons.
Open toolJSON Key Sorter
Sort JSON object keys alphabetically at every level for stable diffs, configuration review, and cleaner commits.
Open toolCSV Column Extractor
Extract named columns from CSV data locally for quick review, cleanup, and smaller import files.
Open toolWord Frequency Counter
Find the most frequent words in text locally while ignoring case and common punctuation.
Open toolUUID Validator
Check whether one or more UUIDs have a valid RFC 4122 shape and identify their version when present.
Open toolIPv4 Address Validator
Validate IPv4 addresses and report whether an address is private, loopback, link-local, or publicly routable.
Open toolBasic Auth Header Generator
Create a Basic Authorization header locally from a test username and password for API debugging.
Open toolURL Query Parameter Merger
Add or replace query parameters in a URL without manually assembling ampersands and encoded values.
Open toolSemantic Version Comparator
Compare two semantic versions and see which release is newer, including prerelease identifiers.
Open toolHTML to Text Converter
Turn an HTML fragment into readable plain text while preserving paragraph and list breaks for notes and review.
Open toolText and Binary Converter
Convert UTF-8 text to binary bytes or decode space-separated binary bytes back into text locally.
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Immediate feedback
Get a result or a useful error message while you are still in the flow.
Local by default
Inputs stay in the browser for supported tools. Do not paste secrets into any online service.
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