Private by default
Every conversion, hash, and calculation runs inside your browser. Your data never touches a server.
34 tools · no sign-up · no uploads Every tool you need.
Every tool you need.
Without sending your data.
Format JSON, convert files, hash text, calculate numbers, and generate metadata — all in a fast static app that works in your browser.
34tools
6categories
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Six focused toolboxes, one consistent interface.
6 tools Calculators Everyday math, health, finance, and science calculators that run entirely in your browser. 13 tools Developer Tools Formatters, encoders, validators, and generators for the daily developer workflow. 5 tools Text Tools Write, count, transform, compare, and generate text without leaving the tab. 4 tools Converters Move cleanly between CSV, JSON, YAML, Markdown, HTML, and time zones. 4 tools Crypto & Security Hashes, classical ciphers, JWT inspection, and modern client-side encryption. 2 tools Browser Tools Network details and QR codes generated from your own browser.
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The tools people open most often.
Scientific Calculator A keyboard-friendly scientific calculator with parentheses, powers, roots, trigonometry, factorials, and memory.
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JSON Formatter & Validator Pretty-print, minify, and validate JSON with helpful error positions and one-click copy.
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Word Counter Notepad A private, auto-saving notepad with character, word, line, and reading-time counts.
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CSV to JSON Converter Convert CSV to JSON with quoted fields, embedded newlines, headers, and configurable trimming.
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Text Encryption Encrypt text with AES-256-GCM and a passphrase, or decrypt legacy CryptoJS payloads.
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QR Code Generator Create downloadable QR codes with custom colors, sizes, error correction, and a proper quiet zone.
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The full directory
All 34 tools, grouped the same way as the navigation.
Calculators
6 tools · Everyday math, health, finance, and science calculators that run entirely in your browser. Scientific Calculator A keyboard-friendly scientific calculator with parentheses, powers, roots, trigonometry, factorials, and memory.
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Unit Converter Convert length, weight, temperature, area, volume, and speed with precise formatting and copyable results.
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Percentage Calculator Find a percentage of a value, calculate percentage change, and work out what percent one value is of another.
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BMI Calculator Calculate body mass index in metric or imperial units with a clear category scale.
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Developer Tools
13 tools · Formatters, encoders, validators, and generators for the daily developer workflow. JSON Formatter & Validator Pretty-print, minify, and validate JSON with helpful error positions and one-click copy.
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XML Formatter Validate and pretty-print XML with configurable indentation, or minify it for transport.
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HTML Encoder & Decoder Escape or unescape HTML entities, including named entities, numeric references, and emoji.
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URL Encoder & Decoder Encode or decode URLs and query values with correct handling of reserved characters and Unicode.
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Text Tools
5 tools · Write, count, transform, compare, and generate text without leaving the tab. Word Counter Notepad A private, auto-saving notepad with character, word, line, and reading-time counts.
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Bold Text Maker Turn plain text into Unicode bold, italic, monospace, script, and other copy-ready styles.
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Lorem Ipsum Generator Generate deterministic Lorem Ipsum paragraphs in plain text or HTML with precise word counts.
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String to Binary Convert text to UTF-8 binary and binary back to text with strict validation.
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Converters
4 tools · Move cleanly between CSV, JSON, YAML, Markdown, HTML, and time zones. CSV to JSON Converter Convert CSV to JSON with quoted fields, embedded newlines, headers, and configurable trimming.
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Markdown to HTML Convert Markdown to sanitized HTML with GitHub-flavored tables, code blocks, and a safe preview.
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Time Zone Converter Convert a date and time between any two IANA time zones, with DST warnings and accurate offsets.
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YAML to JSON Converter Convert YAML to JSON with clear type handling, multi-document support, and line/column errors.
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Crypto & Security
4 tools · Hashes, classical ciphers, JWT inspection, and modern client-side encryption. Classical Cipher Generator Encrypt and decrypt with Caesar, Vigenère, Atbash, and ROT13 ciphers.
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Hash Generator Hash text with MD5, SHA-1, SHA-256, SHA-512, SHA-3, and RIPEMD-160 using bundled implementations.
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JWT Decoder Decode JWT header, payload, and signature with claim timestamps and expiry warnings.
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Text Encryption Encrypt text with AES-256-GCM and a passphrase, or decrypt legacy CryptoJS payloads.
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Browser Tools
2 tools · Network details and QR codes generated from your own browser.Small tools. Serious details.
Built for the moments when a random website asks you to upload something private.
Instant, offline-friendly
Static pages and small TypeScript modules. Tools initialize in milliseconds and keep working after load.
Keyboard-first
Search with ⌘K, tab through labelled controls, copy results, and get clear errors when input is invalid.
Also worth a look
Handy utilities that do not always make the front page.
IP & Browser Info Look up your public IP details and inspect browser, screen, time zone, and capability information.
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JWT Decoder Decode JWT header, payload, and signature with claim timestamps and expiry warnings.
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Hash Generator Hash text with MD5, SHA-1, SHA-256, SHA-512, SHA-3, and RIPEMD-160 using bundled implementations.
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Classical Cipher Generator Encrypt and decrypt with Caesar, Vigenère, Atbash, and ROT13 ciphers.
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