Base ConverterConvert integers between binary, octal, decimal, hexadecimal and any base from 2 to 36, using digits 0-9 then letters a-z, with a live common-base reference table.Base64 Encoder / DecoderEncode text to Base64 and decode it back through UTF-8 bytes so Chinese, emoji and other Unicode characters survive the round trip, with copy and result feedback.URL Encoder / DecoderPercent-encode and decode URLs and query parameters in both encodeURIComponent and encodeURI modes, correctly escaping Chinese and spaces, with friendly errors on malformed sequences.HTML Entity Encoder / DecoderConvert characters to and from HTML entities: named ones (amp, lt, gt, quot) and numeric hex entities, with non-ASCII auto-escaped and a per-character mapping table.Unicode Escape Encoder / DecoderConvert characters to and from uxxxx escapes, splitting emoji and other supplementary-plane characters into correct surrogate pairs, with per-character code point, UTF-8 bytes and UTF-16 units.UUID GeneratorGenerate RFC 4122 version-4 UUIDs locally in the browser with crypto.randomUUID, from 1 to 20 at a time, uppercase or lowercase, hyphens optional, copy one or all.QR Code GeneratorGenerate a QR code from any text, link or phone number, with adjustable size, margin, error-correction level and foreground or background colors, live preview and one-click HD PNG download.Password GeneratorGenerate strong random passwords locally in the browser, length 4 to 128, with selectable upper or lower letters, digits and symbols, live entropy and strength rating, up to 10 at once.JSON FormatterFormat, minify and validate JSON in the browser, pretty-printing with two-space indentation, pointing at the exact line, column and snippet on error, with object and array structure stats.Character CounterCount characters with or without spaces, words, lines, paragraphs and UTF-8 bytes live as you type, with built-in targets like Weibo 140 or Twitter 280 and a remaining-characters counter.Hash GeneratorCompute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of text or a local file live, with one-click copy and uppercase toggle, for file checksums and integrity verification.Regex TesterTest regular expressions live with match highlighting and hit count, capture groups shown per match, flags global, case-insensitive, multiline and more, plus built-in email and phone examples.Markdown PreviewWrite Markdown on the left and render it live on the right, with GFM tables, fenced code blocks and strikethrough, plus a view and one-click copy of the generated HTML source.Case ConverterConvert any text to eight casings at once: UPPERCASE, lowercase, Title Case, sentence case, camelCase, PascalCase, snake_case and kebab-case, each with its own copy button.
Keep a kind heart, hold integrity as your foundation, and cherish warm love; may the world know peace and humanity live in harmony.
持善良之心，守正直之本，怀温暖之爱；愿世界和平，人间祥和。