Paste it here. It stays here.
54 tools that run entirely inside this tab. No account, no upload, no server round-trip — your data never reaches us, because there is nowhere for it to go.
live — json formatter & validator
Open full pageFormatted
{
"name": "web-util-kit",
"tools": 200,
"private": true,
"stack": [
"astro",
"react"
],
"owner": {
"handle": "d-akselrod",
"since": 2026
}
}121 bytes7 keysdepth 21 array
All tools
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54 tools match
math
- Age CalculatorCalculate exact age in years, months and days between two dates, in your browser.
- BMI CalculatorCalculate body mass index from height and weight, in metric or imperial units, in your browser.
- Loan Payment CalculatorCalculate a loan’s monthly payment and total interest from its rate and term, in your browser.
- Percentage CalculatorCalculate a percentage of a number, what percent one number is of another, or percent change.
- Tip CalculatorCalculate a tip and split the total bill evenly across any number of people, in your browser.
developer
- Base64 Encoder / DecoderEncode text to Base64 or decode Base64 back to text, entirely in your browser. Nothing is uploaded.
- Cron Expression ExplainerBreak a 5-field cron expression down into plain English, field by field, in your browser.
- CSS FormatterReformat minified or messy CSS with consistent indentation, in your browser.
- CSV Formatter & ValidatorClean up CSV whitespace and quoting, and flag rows with the wrong number of columns.
- HTML Entity Encoder / DecoderEscape text for safe embedding in HTML, or decode entities back to plain text. Runs locally in your browser.
- HTML FormatterReformat minified or messy HTML with consistent indentation, in your browser.
- IP Subnet CalculatorCalculate network address, broadcast address, and usable host range from CIDR notation.
- JSON Formatter & ValidatorFormat, validate and minify JSON in your browser. Files are processed locally and never uploaded.
- JSON to TypeScript InterfaceGenerate TypeScript interfaces from a sample JSON object, entirely in your browser.
- Meta Tag GeneratorGenerate title, description, Open Graph and Twitter Card meta tags, in your browser.
- Regex TesterTest a JavaScript regular expression against text and see every match highlighted, in your browser.
- Unicode Codepoint InspectorBreak text down into its Unicode codepoints and UTF-8 byte representation, in your browser.
- URL Encoder / DecoderPercent-encode text for safe use in a URL, or decode it back. Runs in your browser; nothing is uploaded.
converter
- Binary / ASCII ConverterConvert text to space-separated binary bytes, or decode binary back to text, in your browser.
- Image to Base64 Data URLConvert an image into a base64 data URL for inlining in CSS or HTML. Never uploaded.
- JSON ↔ CSV ConverterConvert a JSON array of objects to CSV, or CSV back to JSON, entirely in your browser.
- Morse Code TranslatorTranslate text to Morse code or decode Morse back to text, entirely in your browser.
- Number Base ConverterConvert whole numbers between binary, octal, decimal, hexadecimal, or any base from 2 to 36.
- Unix Timestamp ConverterConvert a Unix timestamp to a readable date, or a date to a timestamp, in your browser.
- Timezone ConverterSee what a date and time in your local timezone looks like around the world, in your browser.
- Data Storage ConverterConvert between decimal (KB, MB, GB) and binary (KiB, MiB, GiB) data storage units.
- Length ConverterConvert between metric and imperial length units, from millimeters to miles, in your browser.
- Temperature ConverterConvert between Celsius, Fahrenheit and Kelvin, in your browser.
- Weight ConverterConvert between metric and imperial weight units, from milligrams to stone, in your browser.
design
- Box Shadow GeneratorBuild a CSS box-shadow value from offset, blur, spread and color, in your browser.
- Color Contrast CheckerCheck the WCAG contrast ratio between two colors and see which accessibility levels they pass.
- Color ConverterConvert a color between HEX, RGB and HSL. Paste any format and see the others instantly, in your browser.
- CSS Gradient GeneratorBuild a linear or radial CSS gradient with a live preview, entirely in your browser.
text
- Text Case ConverterConvert text between camelCase, PascalCase, snake_case, kebab-case and more, in your browser.
- Find & Replace (Regex)Find and replace text using a literal string or a regular expression, entirely in your browser.
- Line Sorter & DeduplicatorSort lines alphabetically, remove duplicates or blank lines, and trim whitespace, in your browser.
- Slug GeneratorTurn a title into a clean, URL-safe slug: lowercase, hyphenated, and free of accents. Runs locally.
- Whitespace & Line Ending CleanerNormalize line endings, strip trailing whitespace, and collapse extra blank lines, in your browser.
- Text Diff CheckerCompare two blocks of text line by line and see what was added, removed, or unchanged.
- Word & Character CounterCount words, characters, sentences and paragraphs, and estimate reading time, in your browser.
generator
- Coin FlipFlip one or many virtual coins using a secure random source in your browser — fair, every time.
- Dice RollerRoll any number of dice with any number of sides, using a secure random source in your browser.
- Lorem Ipsum GeneratorGenerate placeholder Lorem Ipsum text by words, sentences, or paragraphs, entirely in your browser.
- QR Code GeneratorCreate a QR code from any text or URL. Generated in your browser and never uploaded.
- Random Number GeneratorGenerate random whole numbers in a range you choose, using a secure random source in your browser.
- UUID GeneratorGenerate version 4 UUIDs using your browser’s cryptographically secure random number generator.
security
- Hash GeneratorCompute a SHA-1, SHA-256, SHA-384 or SHA-512 hash of text using the Web Crypto API, in your browser.
- JWT DecoderDecode a JSON Web Token to read its header and claims. Nothing is sent anywhere.
- Password GeneratorGenerate a random password with your choice of length and character types, using a secure RNG.
- Password Strength CheckerEstimate a password’s entropy and rough crack time from the character types it uses, in your browser.
- ROT13 / Caesar CipherShift letters by any amount, including the classic ROT13, entirely in your browser.
- Text EncryptionEncrypt text with a passphrase using AES-256-GCM, entirely in your browser. Nothing is uploaded.