KuaiYong Tools

KuaiYong Tools

Paste-and-go local utility tools

Local computeFree foreverNo signup · 165+

Popular tools — tap to open

字Word CounterText { }JSON FormatterDev 时Timestamp ConverterConvert 码QR Code GeneratorGenerate 密Password GeneratorGenerate IDUUID GeneratorGenerate

Browse by category →Privacy

Start by scenario

Not sure where to begin?

Writing & content

Drafts and posts — check length, then preview markdown.

Word Counter Markdown Preview Reading Time Word Frequency Text Diff

Dev & debug

APIs and logs — JSON, encoding, regex and JWT.

JSON Formatter JSON to TypeScript JWT Decoder Regex Tester HTTP Status Codes

Daily productivity

Share, security and life math — QR, passwords, countdown and loans.

QR Code Generator Password Generator Timezone Converter CN Tax Estimate Image Compress

Quick games

Open-source fighter and arcade bites — open in the browser and play.

Open Fighting Duel Dojo Duel Snake Game Shan Hai Tank Arena

All online tools

Text

10 tools

字Word CounterCount Chinese characters, English words, lines and paragraphs before you publish.Hot MDMarkdown PreviewPreview Markdown as you type for notes, README files and drafts.序Text Sort & DedupeSort lines A→Z / Z→A and remove duplicates for lists and notes.AaCase ConverterSwitch text between upper, lower, title and more casing styles.≠Text DiffCompare two texts line by line to spot additions and deletions.换Find & ReplaceFind and replace text, optionally with regular expressions.空Whitespace CleanerTrim edges, collapse spaces or remove blank lines in one click.SLURL SlugifyTurn titles into URL-friendly slugs.读Reading TimeEstimate reading minutes from CJK/English text.频Word FrequencyCount word/character frequencies in text.

Dev

13 tools

{ }JSON FormatterPretty-print or minify JSON and catch syntax errors while debugging APIs.Hot JTJWT DecoderDecode JWT header and payload locally (no signature verification).Hot .*Regex TesterTest regular expressions against sample text with match highlighting.Hot 表CSV ↔ JSONConvert between CSV tables and JSON arrays locally.链URL ParserSplit protocol, host, path, query params and hash for debugging.Hot 定时Cron ExplainerExplain common 5-field cron expressions in plain language.IPIP Address LookupInstantly see your public IP, city, region, ISP, and time zone.Hot TSJSON to TypeScriptGenerate a TypeScript interface draft from JSON.Hot SQLSQL FormatterLightly format SQL keywords for readability.码HTTP Status CodesLook up common HTTP status meanings quickly.MTMIME LookupMap extensions to MIME types and reverse.755Chmod CalculatorBuild Linux chmod numeric and symbolic modes.OGMeta / OG TagsGenerate title, description and Open Graph tags.

Encode

7 tools

64Base64 Encode/DecodeEncode or decode Base64 text locally for headers, tokens and quick checks.%URL Encode/DecodeEncode or decode URL components for query strings and redirects.H#Hash CalculatorCompute SHA-1 / SHA-256 / SHA-512 digests of text locally.文File HashCompute SHA-256 of a local file without uploading it.<>HTML EscapeEscape or unescape HTML entities for safe snippets.HxHex Encode / DecodeConvert text to hex and back for protocol debugging.AESAES Encrypt / DecryptAES-GCM encrypt text locally with a passphrase.

Generate

9 tools

码QR Code GeneratorGenerate a QR code from any text or URL and download it as PNG.Hot 密Password GeneratorCreate strong random passwords with length and character-set controls.Hot IDUUID GeneratorBatch-generate UUID v4 values for tests and idempotency keys.Hot 随Random NumberGenerate random integers within a min/max range.段Lorem TextGenerate placeholder paragraphs for layouts and demos.强Password StrengthEstimate password strength locally.假Fake DataGenerate mock names, phones and emails for testing.Hot 渐CSS GradientBuild a linear-gradient and copy CSS.影Box ShadowVisually craft box-shadow CSS.

Convert

8 tools

时Timestamp ConverterConvert Unix timestamps and local datetime both ways (seconds or milliseconds).Hot 色Color ConverterConvert between HEX, RGB and HSL for design and CSS work.图Image → Base64Turn a local image into a data URL without uploading.壹Number → ChineseConvert Arabic numerals to Chinese uppercase/lowercase forms.0xRadix ConverterConvert between binary, octal, decimal and hex.区Timezone ConverterCompare local times across major cities.Hot pxpx ↔ remConvert pixels to rem with a custom root size.AAColor ContrastCheck WCAG contrast between two colors.

Calc

6 tools

换Unit ConverterConvert common length, weight and temperature units.%Percentage CalculatorCalculate percentages, increases and what-percent-of problems.贷Mortgage EstimatorEstimate equal-installment or equal-principal monthly payments.Hot 比Aspect RatioSimplify width/height into a ratio.税CN Tax EstimateRough personal income tax estimate (not official).Hot 薪Net Salary EstimateRough take-home pay after social fees and tax.

Life

9 tools

BMIBMI CalculatorCompute BMI from height and weight with category hints.机Device InfoInspect screen size, language, timezone and user agent.日Date DifferenceCount days between two dates for countdowns and schedules.Hot 证ID Checksum (CN)Validate 18-digit Chinese ID checksum and parse birth/gender locally.速Speed TestTest your download speed, upload speed, and latency via Cloudflare CDN.Hot 龄Age & ZodiacCompute age and Chinese zodiac from birthday.骰Coin & DiceFlip a coin or roll a die for quick decisions.表StopwatchA simple in-browser stopwatch.番PomodoroClassic 25/5 focus timer.

Image

2 tools

压Image CompressCompress images locally without uploading.Hot 缩Image ResizeResize images to exact dimensions locally.

Games

101 tools

Start by scenario

Writing & content

Dev & debug

Daily productivity

Quick games

All online tools

Text

Dev

Encode

Generate

Convert

Calc

Life

Image

Games

A tools site worth investing in

All online tools

Text

Dev

Encode

Generate

Convert

Calc

Life

Image

Games