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The Base64 encoder and decoder converts plain text, JSON payloads, and Unicode content to and from Base64 in a single click. It uses UTF-8 encoding internally, so characters like emoji and non-Latin scripts are handled correctly — unlike ASCII-only tools that silently mangle multi-byte characters. Common uses include encoding API credentials for HTTP Basic Auth headers, embedding binary data in JSON, and decoding tokens copied from browser storage or server logs.

The URL encoder and decoder percent-encodes special characters in query strings and URL components, and decodes them back to readable text. It handles spaces, ampersands, equals signs, slashes, and every other reserved character that would break a URL if left unescaped. Use it to prepare query parameters before appending them to a request, or to decode obfuscated redirect URLs copied from browser address bars and server logs.

The HTML escape and unescape tool converts characters like <, >, &, and quotes into their HTML entity equivalents and back again. This is essential when inserting user-generated content into HTML templates, writing inline code samples in documentation, or debugging double-encoded strings that appear garbled in rendered output.

The hash generator produces MD5, SHA-1, SHA-256, and SHA-512 digests for any input string, entirely in your browser using the Web Crypto API. Use it to verify file checksums, generate fingerprints for cache-busting, check that a copied secret matches an expected hash, or produce test fixtures for code that depends on cryptographic digests. No data leaves your device.

The JWT encoder and decoder splits a JSON Web Token into its three parts — header, payload, and signature — and displays each section as formatted JSON. It shows the algorithm, issued-at time, expiry, and any custom claims without requiring a secret. Use it to debug authentication issues, inspect tokens from third-party providers, or verify that a generated token contains the expected claims before deploying a change.

The binary, hex, and octal converter translates any integer between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) simultaneously. All four representations update as you type. It is useful for reading memory addresses, understanding Unix file permissions (e.g. 755 in octal equals 111 101 101 in binary), debugging bitmasking logic, or converting colour channel values between decimal and hex.

The password generator produces cryptographically secure random passwords using the browser's Web Crypto API — the same source used by password managers. Configure length (4–128 characters), toggle uppercase, lowercase, numbers, and symbols, and generate up to 20 passwords in one batch. A five-segment strength bar and entropy score in bits appear alongside each result so you can instantly see whether the output meets your security requirements.

The password strength checker analyses any password and shows its entropy in bits, a strength rating from Weak to Very Strong, a character composition breakdown, and estimated crack times at four realistic attack speeds — from a slow online attack at 100 guesses per second up to a GPU cluster running 100 billion guesses per second. Use it to audit existing passwords, compare the effect of adding symbols or extra length, or verify that a candidate password is genuinely hard to crack before committing to it.

The HTTP request builder lets you compose and fire real HTTP requests directly from your browser — no Postman, no curl, no install required. Pick a method (GET, POST, PUT, PATCH, DELETE, HEAD, or OPTIONS), enter a URL, add query params and custom headers via a key-value editor, attach a JSON body for write operations, and hit Send. The full response status code, timing, response headers, and body are shown instantly, with JSON automatically pretty-printed for readability.

The JSON formatter, minifier, and validator pretty-prints compact JSON with configurable indentation and highlights syntax errors with precise line numbers. The interactive tree view lets you collapse and expand individual objects and arrays so you can focus on the part of the structure you care about without scrolling through thousands of lines. The minifier strips all whitespace for transport, and the validator reports whether the input is well-formed without modifying it.

The JSON to CSV converter flattens a JSON array of objects into a comma-separated spreadsheet, auto-detecting column headers from the object keys. The reverse direction imports a CSV and reconstructs a JSON array. Use it to export API responses to Excel or Google Sheets for stakeholder reporting, import spreadsheet data into a JSON-based pipeline, or quickly inspect the shape of a dataset in tabular form.

The JSON to YAML converter switches between the two most common configuration file formats with one click. JSON-to-YAML is lossless; YAML-to-JSON preserves all data values but drops comments, since JSON has no comment syntax. This is useful when migrating configuration between tools that prefer different formats — for example moving a Docker Compose file to a JSON-based deployment manifest, or converting an OpenAPI spec between representations.

The case converter transforms text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and plain lowercase or uppercase instantly. It is useful when renaming variables across a codebase, formatting identifiers to match a new style guide, or converting human-readable labels into URL slugs and vice versa.

The word counter counts words, characters, characters without spaces, sentences, paragraphs, and estimated reading time for any block of text. Paste a blog post draft, a pull request description, or a support reply to check length before publishing. It updates live as you type, so there is no need to press a button.

The byte size counter shows the exact UTF-8 byte length of any string alongside its character count, kilobyte value, and megabyte value. Because multi-byte characters like emoji and CJK glyphs use more than one byte, character count and byte count often differ. Use it to check whether a value fits within a database column limit, a message queue payload cap, or a cookie size restriction.

The regex tester highlights all pattern matches live as you type, supports flags (global, case-insensitive, multiline, dotAll), and shows captured groups for each match. It is useful for writing and validating regular expressions before embedding them in code, debugging why a pattern matches more or fewer results than expected, or teaching regex syntax with immediate visual feedback.

The diff checker compares two blocks of text line by line and highlights added, removed, and unchanged lines with colour coding. Paste two versions of a config file, an API response before and after a change, or two copies of a document to instantly see what differs. It is particularly useful for reviewing changes in environments where a proper diff tool is not available.

The lorem ipsum generator produces placeholder text by words, sentences, or paragraphs in configurable quantities. Use it to fill wireframes, test how a UI handles varying content lengths, or generate dummy copy for typography and font specimens. The output is derived from the classic Cicero passage and produces natural-looking paragraph lengths.

The Unix timestamp converter translates epoch timestamps — the number of seconds or milliseconds since 1 January 1970 — to human-readable dates and back. It supports both second-precision and millisecond-precision timestamps and displays the result in your local timezone. Use it to read timestamps from server logs, database records, or API responses that return epoch values.

The timezone converter converts a date and time from one timezone to another, covering all IANA timezone identifiers. Use it to schedule meetings across timezones, convert log timestamps to local time, or confirm what a UTC time means in a specific city.

The age calculator computes the exact age from a birth date to today (or any target date) in years, months, and days. It also shows the day of the week the birth date fell on and how many days remain until the next birthday. Use it for age verification logic, birthday automation, or any calculation that requires a precise date difference.

The cron expression builder constructs and explains cron schedule expressions with a visual interface for minutes, hours, days, months, and weekdays. It shows a plain-English description of the schedule and lists the next five run times. Use it to configure scheduled jobs in CI/CD pipelines, cloud functions, task queues, or any system that accepts cron syntax.

The number to words converter spells out any integer or decimal number in English — for example, 1,024 becomes "one thousand and twenty-four". It supports numbers up to 999 quadrillion and handles negative values and decimals. Use it for invoice generation, cheque writing, accessibility labels, or any context that requires a numeric value written as words.

The Roman numeral converter converts Arabic integers (1–3999) to Roman numerals and decodes Roman numerals back to integers. It validates the sequence on decode and rejects malformed input. Use it for year inscriptions, clock faces, movie sequel titles, chapter numbering, or homework verification.

The percentage calculator solves the three most common percentage problems: what is X% of Y, X is what percent of Y, and percentage change from X to Y. Results update instantly. Use it for discount calculations, growth rate analysis, tax computations, or any quick percentage-based arithmetic.

The unit converter handles length, weight, temperature, volume, speed, and area conversions between metric and imperial units. Select a category and the input and output units, enter a value, and get the result instantly. Use it when working across measurement systems in engineering, cooking, travel, or data analysis.

The Hindi numeral converter converts between Devanagari digits (०–९) and standard Arabic digits (0–9) in both directions. It works on full strings, preserving non-digit characters like letters, spaces, and punctuation unchanged. Use it when processing Hindi-language content, localising numeric output to Devanagari script, or decoding amounts and dates copied from Hindi-language documents.

The color picker lets you select any colour using a native browser picker or by entering a HEX code directly, then instantly shows the equivalent HEX, RGB, and HSL values with one-click copy for each format. Use it when you need a colour in a specific format for a CSS stylesheet, a design token file, or a charting library that only accepts RGB tuples.

The QR code generator encodes any URL, plain text, email address, phone number, or other string into a scannable QR code and lets you download it as a PNG at your chosen size. Generation happens entirely in the browser — nothing is sent to a server. Use it for business cards, event posters, product packaging, Wi-Fi sharing, or deep-link marketing campaigns.

The UUID generator creates version 4 (random) and version 1 (time-based) UUIDs one at a time or in bulk up to 100. UUID v4 uses 122 random bits, making collisions astronomically unlikely. UUID v1 encodes the current timestamp, making it sortable by creation time. Use UUIDs as primary keys in distributed databases, idempotency tokens for payment APIs, session identifiers, or any context where a collision-resistant unique string is required.