免费开发者工具

Base64

Encode & decode Base64 strings instantly

Encoder/Decoder

URL encode and decode strings with ease

HTML Entity

Encode and decode HTML entities (&, <, >…)

JWT Decoder

Decode JSON Web Tokens — view header, payload & expiry

JWT Encoder

Generate signed JSON Web Tokens with HS256, HS384, or HS512

JSON Formatter

Format, validate, and minify JSON with pretty-printing

JSON to String

Convert JSON objects to escaped strings and back

JSON to CSV

Convert JSON arrays to CSV with comma, tab, semicolon, or pipe delimiters

CSV to JSON

Convert CSV data to JSON arrays with auto type-casting

YAML ↔ JSON

Convert between YAML and JSON instantly — supports all standard types

JSONPath Tester

Test JSONPath expressions against JSON data with live results

JSON to TypeScript

Convert JSON to TypeScript interfaces or type aliases with nested types and optional fields

JSON to Zod / Yup

Convert JSON objects and arrays to Zod or Yup validation schemas instantly

JSON Schema Generator

Paste sample JSON and generate a valid JSON Schema — auto-detects types, required fields, and nested structures

Word Counter

Count words, characters, lines, sentences, and reading time

Case Converter

Convert between camelCase, snake_case, kebab-case & more

Diff Checker

Compare two text blocks and see line-by-line differences

Lorem Ipsum

Generate placeholder text by paragraphs, sentences, or words

Markdown Preview

Write Markdown and see live rendered HTML side by side

Slug Generator

Convert any text into a clean URL slug with separator and case options

Line Utilities

Sort, deduplicate, shuffle, trim, and transform text lines instantly

UUID Generator

Generate cryptographically random UUID v4 identifiers

Password Generator

Generate strong random passwords with entropy scoring

Color Theme

Generate matching color palettes from any hex color

CSS Gradient Generator

Build linear, radial, and conic CSS gradients visually — drag color stops, share via URL

Color Converter

Convert colors between HEX, RGB, HSL, HSV, and CSS named colors instantly

Hash Generator

Generate MD5, SHA-1, SHA-2, SHA-3, and Argon2 hashes — browser-side, no upload

FauxImage

Placeholder image generator for mockups and prototypes

Image Compressor

Compress JPEG, PNG & WebP images in your browser — lossless for PNG, near-lossless for JPEG

Image Resizer

Resize JPEG, PNG & WebP images to exact dimensions with optional aspect ratio lock

Image Converter

Convert images between JPEG, PNG, WebP, GIF, and BMP formats in your browser — no upload needed

Background Remover

Remove or make image backgrounds transparent — export as PNG with alpha channel. 100% browser-based.

SVG Optimizer

Minify and compress SVG files — remove editor bloat, comments, empty groups, and whitespace with live preview

QR Code Generator

Generate QR codes for URLs, text, emails or phone numbers — download as PNG or SVG

Favicon Generator

Upload a logo and generate all favicon sizes — ICO, PNG, Apple, Android, PWA — with HTML tags and a ZIP download

SQL Formatter

Format and beautify SQL queries with proper indentation and keyword casing

HTML Formatter

Beautify or minify HTML with proper indentation

CSS Formatter

Beautify or minify CSS stylesheets instantly

XML Formatter

Format, beautify, and minify XML with configurable indentation and validation

CSS Box Shadow

Build and preview CSS box-shadow values visually with multi-layer support

Meta Tags Generator

Generate HTML meta tags for SEO, Open Graph, and Twitter Cards

CSS Layout Generator

Build CSS Flexbox and Grid layouts visually with a live preview and copy-ready CSS

Epoch

Unix timestamp converter and date utility

Cron Parser

Translate cron expressions to plain English with next run times

Regex Tester

Test regular expressions with live match highlighting

Number Base

Convert between binary, octal, decimal, and hexadecimal

URL Parser

Break any URL into protocol, host, path, query params, and hash

IP Lookup

See your public IPv4 and IPv6 addresses plus geolocation — country, continent, ASN, and coordinates

Timezone Converter

Convert times across multiple IANA timezones with automatic DST handling

Color Contrast

Check WCAG AA and AAA color contrast ratios for web accessibility

Chmod Calculator

Convert Unix file permissions between octal, symbolic, and checkbox notation

PX to REM

Convert pixels to REM and back with a batch conversion table and CSS snippet

HTTP Status Codes

Complete searchable reference for all HTTP status codes with descriptions

Bcrypt Generator

Hash and verify passwords using bcrypt with adjustable cost factor

TOTP Generator

Generate and test TOTP 2FA codes with QR code output — SHA-1/256/512, 6 or 8 digits

Text Encryptor

Encrypt and decrypt text with AES-256-GCM, AES-256-CBC, or RSA-OAEP — browser-side

Privacy Policy Generator

Generate a free generic privacy policy with GDPR & CCPA disclosures

API Response Checker

Ping any API endpoint and see response time, status code, size, and headers — free, browser-based

cURL Builder

Build cURL commands visually — set method, headers, body, and auth, then copy a ready-to-run command

CORS Checker

Test CORS headers for any URL — see allowed origins, methods, and credentials policy

Meta Tags Generator

Generate HTML meta tags for SEO, Open Graph, and Twitter Cards

OG Validator

Validate Open Graph and Twitter Card tags for any URL — get a score, fix issues, preview social shares

OG Preview

Paste any URL and instantly preview how your link looks when shared on Facebook, Twitter/X, and LinkedIn

Favicon Generator

Upload a logo and generate all favicon sizes — ICO, PNG, Apple, Android, PWA — with HTML tags and a ZIP download

Favicon Preview

View any website's favicon in multiple sizes — check, compare, and download

PDF Editor

Add text annotations to any PDF page and download the updated file

PDF Compressor

Reduce PDF file size with low, medium, or high compression

PDF Merger

Combine multiple PDF files into one — upload, reorder, and merge

PDF Page Remover

Delete pages from a PDF by clicking thumbnails and download the result

PDF Page Extractor

Extract selected pages from a PDF — hover any page to download it individually

PDF to Images

Convert every PDF page to JPEG or PNG images and download as ZIP or individually

Image to PDF

Combine JPEG, PNG, WebP, or GIF images into a single PDF with page size and margin options