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AI & LLM
View categoryTokenizer Playground
See exactly how text becomes tokens, then compare the cost across popular LLMs.
Token Counter
Count characters and LLM tokens with a lightweight, private text workspace.
Token Cost Calculator
Estimate input and output spend with transparent per-million-token pricing.
RAG Chunking Playground
Preview RAG chunks with six strategies, real token counts, source offsets, and exportable results.
AI JSON Repair + Schema Validator
Repair malformed model JSON, inspect every change, and validate detailed JSON Schema constraints locally.
Prompt Diff & Version Compare
Compare prompt revisions by line, word, or grapheme with real token deltas and optional local versions.
Structured Prompt Builder
Build deterministic prompts from typed fields, CO-STAR or RTF structures, ordered examples, and explicit local templates.
Prompt Batch Variable Expander
Expand {{variable}} prompts from JSON or CSV records with warnings, paginated previews, and lossless exports.
Prompt Template Formatter
Fill {{variable}} placeholders from JSON and identify any values your prompt still needs.
Context Window Budget
Measure prompt tokens and calculate the context left after reserving space for model output.
LLM API Request Builder
Build native OpenAI, Anthropic, and Gemini request JSON, cURL, JavaScript, and Python examples without API keys or model calls.
AI Text Cleaner + Invisible Character Inspector
Inspect invisible Unicode at original UTF-16 offsets, selectively clean copied text, and audit every local change.
Text
View categoryWord & Character Counter
Measure words, characters, sentences, paragraphs, and reading time.
Case Converter
Switch between sentence, title, camel, snake, and constant case.
Slug Generator
Turn titles into clean, lowercase, URL-friendly slugs.
Text Diff
Compare two texts with clear line or word additions and deletions.
Whitespace Remover
Trim lines, collapse repeated spaces, remove blank lines, or strip all whitespace.
Duplicate Line Remover
Deduplicate lines while keeping their first occurrence and original order.
Line Sorter
Sort lines alphabetically, numerically, by length, or reverse their order.
Reverse Text
Reverse characters, word order, or line order without breaking emoji sequences.
Find & Replace
Replace every literal or regular-expression match, with optional case-insensitive search.
Text Truncator
Shorten text to an exact character, word, or line limit with a visible ellipsis.
Markdown Stripper
Remove Markdown syntax while preserving readable text, link labels, and code.
List to CSV
Turn newline-separated values into properly quoted single-column CSV.
CSV to List
Parse quoted CSV records and flatten every field into a newline-separated list.
Email Extractor
Extract email addresses from unstructured text, optionally deduplicated case-insensitively.
URL Extractor
Pull HTTP and HTTPS links out of text with trailing punctuation cleanup.
NATO Phonetic Alphabet Converter
Spell letters and digits with the NATO phonetic alphabet for clear spoken communication.
List Transformer
Transpose, affix, sort, reverse, change case, or truncate line-based lists.
Email Normalizer
Trim and lowercase addresses with optional Gmail dot and plus-tag rules.
Numeronym Generator
Shorten words into numeronyms such as i18n, a11y, and l10n.
String Obfuscator
Mask the middle of text while preserving configurable leading and trailing characters.
ASCII Art Text Generator
Turn text into multiline ASCII banners with three built-in FIGlet-style font maps.
Emoji Picker
Search common emoji by name or keyword and inspect Unicode codepoints.
Phone Parser & Formatter
Validate and format phone numbers in E.164, international, and national forms.
IBAN Validator & Parser
Check IBAN country length and mod-97 checksum, including QR-IBAN detection.
Converters
View categoryColor Converter
Translate HEX colors into RGB and HSL with a live visual preview.
Number Base Converter
Convert signed integers between bases 2–36 with arbitrary-precision arithmetic.
RGB to HEX
Convert opaque RGB color channels into a six-digit hexadecimal color.
HSL to HEX
Convert hue, saturation, and lightness into an opaque hexadecimal color.
Length Converter
Convert metric and imperial lengths through exact meter-based factors.
Weight Converter
Convert mass units including grams, kilograms, ounces, pounds, and stones.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin while rejecting temperatures below absolute zero.
Data Size Converter
Convert decimal SI and binary IEC data-size units without mixing their factors.
Aspect Ratio Calculator
Simplify width-to-height ratios and scale one dimension proportionally.
PX / REM Converter
Convert pixels and root-relative rem units using a configurable root font size.
Angle Converter
Convert degrees, radians, gradians, and turns using a common angular reference.
Roman Numeral Converter
Convert canonical Roman numerals and integers from 1 to 3999.
YAML / TOML Converter
Convert YAML and TOML configuration documents in either direction.
JSON / TOML Converter
Convert JSON objects and TOML documents in either direction.
Encoders & Decoders
View categoryBase64 Encoder / Decoder
Convert UTF-8 text to Base64 and decode it without encoding surprises.
URL Encoder / Decoder
Escape URL components and decode percent-encoded strings safely.
HTML Entity Encoder
Encode HTML-special characters and decode numeric or common named entities.
Unicode Escape Converter
Escape Unicode as UTF-16 \uXXXX sequences or decode fixed and braced escapes.
JWT Decoder
Decode JWT headers and claims locally without trusting or verifying signatures.
Base64URL Converter
Encode UTF-8 text as unpadded Base64URL or decode URL-safe Base64.
HEX Text Converter
Convert Unicode text to UTF-8 hexadecimal bytes and decode hex back to text.
Binary Text Converter
Represent Unicode text as 8-bit UTF-8 binary bytes and decode binary back to text.
Morse Code Converter
Translate Latin letters, digits, and punctuation to International Morse code and back.
UTF-8 Byte Inspector
Inspect Unicode code points, UTF-16 units, and exact UTF-8 bytes per character.
Outlook Safe Link Decoder
Extract original HTTP or HTTPS destinations from Outlook Safe Links URLs.
Generators
View categoryUUID Generator
Generate cryptographically random version 4 UUIDs, one or in bulk.
Password Generator
Create strong random passwords with controls you can actually understand.
Lorem Ipsum Generator
Generate measured paragraphs of classic placeholder text for layouts.
ULID Generator
Generate sortable, time-based ULIDs with cryptographically secure randomness.
Nano ID Generator
Create compact random IDs with custom length and URL-safe, numeric, or hex alphabets.
Random Number Generator
Generate unbiased random integers or decimals within an exact range.
Dice Roller
Roll tabletop dice with standard notation, modifiers, and visible individual results.
Coin Flip
Flip fair virtual coins and see every heads-or-tails result with totals.
Color Palette Generator
Generate five-color CSS palettes using classic color harmonies.
CSS Gradient Generator
Build linear, radial, and conic CSS gradients from multiple HEX colors.
QR Code Generator
Create scannable QR codes locally and download real SVG or PNG images.
Random Port Generator
Generate unique random port numbers inside a custom range from 1024 to 65535.
Random MAC Address Generator
Generate random unicast MAC addresses with prefix, case, quantity, and local-bit controls.
WiFi QR Code Generator
Create a scannable WiFi QR code with escaped credentials and local SVG or PNG export.
SVG Placeholder Generator
Generate real scalable SVG placeholders with custom dimensions, colors, and text.
Formatters
View categoryJSON Formatter
Format, validate, and minify JSON with clear syntax feedback.
XML Formatter
Validate, pretty-print, and minify XML while preserving mixed content.
YAML Formatter
Parse YAML and normalize indentation with a real YAML serializer.
SQL Formatter
Format common SQL queries with clause breaks and keyword-case controls.
CSS Formatter
Expand compact CSS into readable rules with safe string handling.
HTML Formatter
Indent explicit HTML markup while keeping inline and raw-text content intact.
Markdown Formatter
Normalize Markdown headings, lists, blank lines, and trailing whitespace.
JSON to CSV Converter
Convert JSON objects into CSV with flattened fields and proper quoting.
CSV to JSON Converter
Parse delimited rows into JSON with quoted fields and embedded newlines.
JSON YAML Converter
Convert between JSON and YAML using real parsers in both directions.
XML to JSON Converter
Convert XML elements, attributes, and text into explicit structured JSON.
JSON to XML Converter
Build escaped XML from explicit name, attributes, and children JSON.
Markdown to HTML Converter
Render Markdown as real HTML with the marked parser.
Network & Web
View categoryURL Parser
Split an absolute URL into its protocol, host, path, query, and fragment.
Query String Parser
Decode query parameters and preserve empty or repeated values.
User-Agent Parser
Identify common browser, operating system, engine, and device clues.
HTTP Status Lookup
Look up standard HTTP response codes in a compact offline reference.
MIME Type Lookup
Map common file extensions and internet media types in either direction.
HTTP Header Parser
Parse raw HTTP headers while preserving duplicate fields and reporting malformed lines.
CSP Parser
Break a Content Security Policy into directives and highlight common weaknesses.
IPv4 Address Converter
Convert IPv4 between dotted, integer, hexadecimal, and binary forms.
CIDR Calculator
Calculate IPv4 network, mask, broadcast, wildcard, and usable ranges.
Basic Auth Generator
Encode username:password as a UTF-8 Base64 Authorization header.
IPv4 Range to CIDR Expander
Convert an inclusive IPv4 start/end range into the smallest exact CIDR block set.
MAC Address OUI Lookup
Identify selected common vendors from MAC prefixes with a clearly limited offline reference.
IPv6 ULA Generator
Generate an RFC 4193 unique local IPv6 /64 subnet with a random 40-bit global ID.
Device & Browser Information
Inspect live screen, viewport, browser, language, platform, touch, and online details.
Crypto & Security
View categoryHash Generator
Create SHA-1, SHA-256, SHA-384, or SHA-512 digests from text.
HMAC Generator
Create keyed SHA-based message authentication codes with Web Crypto.
MD5 Hash Generator
Calculate legacy MD5 digests for non-security checksums and compatibility.
Password Strength Checker
Estimate password entropy and identify common passwords, repeats, and sequences.
CRC32 Checksum
Calculate standard CRC-32 checksums from UTF-8 text in hex or decimal.
AES Text Encryptor
Encrypt and decrypt UTF-8 text with AES-GCM and a PBKDF2-derived key.
Bcrypt Hash Generator
Hash passwords locally with bcrypt, a random salt, and selectable cost.
BIP39 Passphrase Generator
Generate real 12- or 24-word BIP39 mnemonics with an optional passphrase.
RSA Key Pair Generator
Generate RSA signing keys and export PKCS8 private and SPKI public PEM.
Text Encryption
Encrypt and decrypt text with AES, TripleDES, Rabbit, or RC4.
PDF Signature Checker
Inspect PDF AcroForm signature fields, ByteRange values, and available signer metadata.
TOTP Code Generator & Verifier
Generate Base32 secrets, current six-digit TOTP codes, and verify authenticator codes.
Images & Media
View categoryImage Metadata Viewer
Inspect local image dimensions, file size, format, aspect ratio, and modification details.
Image Resizer
Resize images to exact pixel dimensions with aspect-ratio locking and live output previews.
Image Format Converter
Convert images to PNG, JPEG, or WebP with transparent-background controls and quality settings.
Image to Base64
Encode local images as Base64 or complete data URLs for CSS, HTML, and development fixtures.
SVG Optimizer
Minify SVG markup while removing scripts, event handlers, unsafe links, and unnecessary comments.
Favicon PNG Generator
Generate real square PNG icons at favicon and app-icon sizes from a local image.
Image Color Picker
Pick exact pixels from an image preview and copy their HEX, RGB, and HSL color values.
Camera & Video Recorder
Capture PNG photos and record supported video formats from a permitted camera.
File to Base64 Converter
Encode any local file as raw Base64 or a complete data URL without image decoding or uploads.
Math & Dates
View categoryUnix Timestamp Converter
Move between Unix timestamps and readable UTC or local dates.
Date Difference
Calculate exact elapsed time between two dates or timestamps.
Timezone Converter
Convert a local date-time between IANA time zones with DST awareness.
Cron Expression Parser
Validate five-field cron schedules and preview the next five UTC runs.
Percentage Calculator
Calculate percent of a value, percentage rate, or percentage change.
Proportion Calculator
Solve a/b = c/d for one unknown using cross multiplication.
Average Calculator
Calculate arithmetic mean, median, mode, sum, and range endpoints.
GCD & LCM Calculator
Find exact greatest common divisors and least common multiples.
Factorial Calculator
Compute exact factorials with arbitrary-precision integer arithmetic.
Fibonacci Generator
Generate exact indexed Fibonacci terms starting with F(0) = 0.
Prime Number Checker
Test integer primality and show factors for composite numbers.
Compound Interest Calculator
Estimate compound growth from principal, rate, time, and frequency.
Download ETA Calculator
Calculate remaining time and estimated completion from downloaded, total, and rate values.
Safe Math Expression Evaluator
Evaluate arithmetic and selected functions with a recursive-descent parser, never eval.
Chronometer
Measure elapsed time with pause, resume, reset, and precise lap tracking.
Development
View categoryRegex Tester
Test JavaScript regular expressions and inspect matches, groups, and indices.
Regex Replacer
Replace text with JavaScript regex patterns and capture references.
Chmod Calculator
Convert three-digit Unix permissions and symbolic owner/group/other clauses.
SemVer Parser
Split semantic versions into numeric, prerelease, and build components.
SemVer Compare
Compare two semantic versions using prerelease precedence rules.
CSS Specificity Calculator
Calculate ID, class, and type specificity for selectors and selector lists.
JSONPath Evaluator
Query JSON with an explicit safe subset of JSONPath expressions.
.gitignore Generator
Generate practical ignore files from built-in language and OS templates.
package.json Validator
Check common npm manifest structure, versions, fields, and dependency mistakes.
Docker Run Parser
Parse docker run flags, image names, and container command arguments.
Dockerfile Basic Linter
Run transparent structural and best-practice checks on Dockerfile text.
JSON Diff
Recursively compare two JSON documents and report structured changes.
Open Graph Meta Generator
Generate complete Open Graph and Twitter card meta tags from JSON or four lines.
Keyboard Event & Keycode Inspector
Inspect keyboard key, code, legacy keyCode, location, and modifier state accessibly.
HTML WYSIWYG Editor
Edit rich text visually and export sanitized HTML with headings, lists, and links.
Safe JavaScript Benchmark Builder
Benchmark a restricted set of JavaScript-like expressions without eval.
Git Cheatsheet
Search a practical reference of common Git commands and workflows.
Regex Cheatsheet
Search regular-expression tokens, assertions, groups, and quantifiers.