80Tools

Base64 Encode / Decode

Encode UTF-8 text to Base64 or decode Base64 back to plain text.

Uses UTF-8 safe conversion so Unicode text round-trips correctly in the browser.

URL Encode / Decode

Encode or decode URL components without leaving the page.

Uses encodeURIComponent and decodeURIComponent directly in the browser.

HTML Entity Encode / Decode

Convert reserved HTML characters into entities or decode entities back to text.

Useful for escaping snippets before embedding them in HTML or documentation.

Unicode Escape Converter

Escape text into Unicode notation or unescape Unicode sequences back to text.

Supports both classic \uXXXX sequences and \u{1F600}-style code point escapes.

JWT Decoder

Decode JWT header and payload segments locally without verifying the signature.

The token never leaves the browser; this page only decodes the Base64URL segments.

Hashing

Hashing / Encryption

Digest and signature utilities powered by CryptoJS on the client.

5 tools

MD5 Hash Generator

Hash text with MD5 in the browser using CryptoJS.

Useful for compatibility checks and legacy workflows, not for password storage.

SHA-1 Hash Generator

Hash text with SHA-1 in the browser using CryptoJS.

Provided for interoperability where SHA-1 is still required by legacy systems.

SHA-256 Hash Generator

Hash text with SHA-256 in the browser using CryptoJS.

Generates a 64-character hexadecimal digest client-side.

SHA-512 Hash Generator

Hash text with SHA-512 in the browser using CryptoJS.

Creates a strong 128-character hexadecimal digest entirely on the client.

HMAC Generator

Generate keyed HMAC digests in the browser using CryptoJS.

Pick MD5, SHA-1, SHA-256, or SHA-512 and sign text with a shared secret.

Formatting

Formatting / Beautifying

Pretty printers and minifiers for structured text and code.

5 tools

JSON Formatter

Format or minify JSON with configurable indentation.

Validates JSON before formatting and reports parsing errors in place.

XML Formatter

Pretty-print or minify XML directly in the browser.

Parses XML with DOMParser so malformed input is reported before formatting.

CSS Formatter

Beautify or minify CSS stylesheets in the browser.

Uses js-beautify for readable output and a lightweight client-side minifier.

SQL Formatter

Format SQL queries for readability or collapse them to a compact single line.

Uses sql-formatter from CDN on the client side only.

HTML Formatter

Beautify or minify HTML markup entirely in the browser.

Uses js-beautify for readable output and a lightweight whitespace minifier.

Generators

Create IDs, passwords, placeholder text, QR codes, and barcodes.

5 tools

UUID Generator

Generate random UUID values in the browser.

Uses crypto.randomUUID when available and falls back to secure random bytes.

Random Password Generator

Generate secure random passwords with configurable character sets.

Uses crypto.getRandomValues and guarantees at least one character from each selected group.

Lorem Ipsum Generator

Generate placeholder words, sentences, or paragraphs in the browser.

Creates random filler text from a built-in word list with no server dependency.

QR Code Generator

Generate QR codes in the browser with customizable colors and size.

Uses QRCode.js from CDN and never uploads the encoded content.

Barcode Generator

Generate barcodes locally using JsBarcode.

Supports CODE128, EAN-13, and UPC formats without any server round trip.

Converters

Convert dates, colors, numeric bases, numerals, and text casing.

5 tools

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Handles seconds or milliseconds and keeps all calculations on the client.

RGB / HEX Converter

Convert colors between RGB, HEX, and browser color input formats.

Also calculates HSL and shows a live swatch for the selected color.

Number Base Converter

Convert whole numbers between bases 2, 8, 10, and 16.

Uses BigInt so large integers can be converted accurately without the server.

Roman Numeral Converter

Convert Arabic numbers to Roman numerals or decode Roman numerals back to numbers.

Supports values from 1 to 3999 and validates Roman numeral syntax.

Text Case Converter

Convert text between uppercase, lowercase, title case, sentence case, and swap case.

Lets you quickly reshape large text blocks entirely in the browser.

Text

Text Processing

Measure, transform, compare, and inspect strings in the browser.

5 tools

Character / Word Counter

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

Useful for copy length checks, summaries, and quick content audits.

Regex Tester

Test regular expressions against input text and inspect all matches.

Highlights match counts and lists captures locally without sending source text anywhere.

String Reverser

Reverse text while preserving Unicode code points as well as possible.

Uses grapheme segmentation when the browser supports it.

Base58 Encode / Decode

Encode UTF-8 text to Base58 or decode Base58 back to text.

Useful for compact identifiers that avoid visually ambiguous characters.

Levenshtein Distance

Measure edit distance and similarity between two strings.

Computes insertions, deletions, and substitutions directly in the browser.

Dev

Developer Tools

Daily helpers for tokens, headers, YAML/JSON, cURL, and user agents.

5 tools

JWT Parser

Parse JWT claims, timestamps, and signature details without verifying the token.

Useful for debugging issued tokens locally while keeping secrets off the server.

YAML / JSON Converter

Convert YAML to JSON or JSON back to YAML in the browser.

Uses js-yaml from CDN and never posts the source document anywhere.

cURL Command Generator

Build a cURL command from method, URL, headers, query params, and body text.

Generates a portable one-line command locally without contacting the target URL.

User Agent Parser

Parse browser, OS, device, and CPU data from a user agent string.

Uses UAParser.js from CDN and can auto-fill the current browser user agent.

HTTP Headers Parser

Parse raw HTTP request or response headers into structured JSON.

Accepts pasted headers and extracts the start line plus normalized key/value pairs.

Other

Other Utilities

Extra helpers for markdown, accessibility, validation, math, and checksums.

15 tools

Markdown Preview

Render Markdown to sanitized HTML locally in the browser.

Uses marked plus DOMPurify from CDN for a quick live preview with client-side sanitization.

Color Contrast Checker

Check WCAG contrast ratios for foreground and background color pairs.

Calculates relative luminance, contrast ratio, and AA/AAA pass states on the client.

CSS Unit Converter

Convert between px, rem, em, vw, vh, and percent values.

Uses your chosen root size and viewport dimensions as the conversion context.

Emoji Encoder / Decoder

Convert emojis to code point notation or decode code points back to emoji text.

Uses U+ notation for readability and supports multi-code-point input.

Password Strength Checker

Estimate password strength, entropy, and composition signals in the browser.

Scores length, character variety, and common weakness patterns without sending the password anywhere.

Credit Card Validator

Validate card numbers with the Luhn algorithm and detect common card brands.

Does not contact any payment network and does not verify whether a card is real or active.

Resident ID Validator

Validate an 18-digit Mainland China resident ID format locally.

Checks format, birth date, checksum, and infers the encoded gender flag as a browser-side demo.

Percentage Calculator

Solve common percentage formulas such as ratio, percent-of-number, and percentage change.

Uses one shared form and explains the applied formula in the result panel.

Average Calculator

Calculate count, sum, average, median, min, and max for a list of numbers.

Parses numbers from commas, spaces, or line breaks locally in the browser.

Camel / Snake / Kebab Converter

Convert identifiers between camelCase, snake_case, kebab-case, and PascalCase.

Splits words with heuristics so developer-friendly identifiers can be reshaped quickly.

Unicode Normalizer

Normalize text into NFC, NFD, NFKC, or NFKD forms using the browser API.

Also shows the resulting code points so normalization changes are easy to inspect.

ASCII Table

Browse the ASCII table and inspect the codes for your own text.

Renders the full 0-127 chart client-side and highlights the pasted characters separately.

Bitwise Calculator

Calculate AND, OR, XOR, NOT, left shift, and right shift with BigInt-based logic.

Accepts binary, decimal, or hexadecimal input and shows the result in multiple bases.

CRC-32 Checksum

Calculate a CRC-32 checksum for input text in the browser.

Shows both hexadecimal and unsigned decimal output for quick checksum comparisons.