全部 500+ 在线工具大全
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JSON Formatter & Validator
Prettify, minify, and validate JSON data with syntax tree inspection and error highlighting.
Word & Character Counter
Real-time word, character, sentence, paragraph counting with reading and speaking time estimates.
Base64 Encoder / Decoder
Instant client-side base64 text and binary encoding/decoding with URL-safe RFC 4648 support.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, kebab-case, and snake_case.
Hash Generator (SHA & MD5)
Compute SHA-256, SHA-512, and MD5 cryptographic digests instantly using the native Web Crypto API.
Regex Tester & Debugger
Test regular expressions with real-time match highlighting, flag toggles, and replacement previews.
Percentage Calculator
Calculate percentage increases, discounts, tips, margins, and proportion differences in seconds.
SVG to PNG / WebP Converter
Rasterize SVG vector illustrations into PNG or WebP images with custom resolution scaling.
URL Encoder / Decoder
Safely encode or decode special characters in URLs and query parameters conforming to RFC 3986.
UUID / GUID Generator
Generate cryptographically random RFC 4122 v4 UUIDs in bulk with customizable formatting.
Markdown Live Editor
Write Markdown with real-time GitHub-flavored preview, table formatting, and HTML export.
Color Palette & Picker
Generate harmonious color schemes, extract HEX/RGB/HSL codes, and verify WCAG contrast ratios.