All tools

JSON Diff

Compare two JSON documents and see added, removed, and changed fields — privately.

JSON Escape / Unescape

Escape and unescape JSON strings in your browser — privately.

JSON Formatter

Format, validate, and minify JSON in your browser — privately.

JSON Minifier

Compress JSON for production — strip whitespace, comments, and trailing commas.

JSONPath Evaluator

Query JSON documents with JSONPath expressions — privately, in your browser.

JSON ↔ YAML Converter

Convert JSON to YAML and YAML to JSON in your browser — privately.

Base32 Encode / Decode

Encode and decode Base32 strings in your browser — RFC 4648, RFC 4648-hex, and Crockford alphabets.

Base56 Encode / Decode

Encode and decode Base56 — no-confusables alphabet, safe to type by hand.

Base62 Encode / Decode

Encode and decode Base62 strings — shorter than Base64, URL-safe, UTF-8 clean.

Base64 Encode / Decode

Encode and decode Base64 strings in your browser — UTF-8 safe, privately.

Data URL Parser & Builder

Parse, build, and inspect RFC 2397 data URLs — inline images, fonts, and text in your browser.

Hex Encoder / Decoder

Convert between text and hexadecimal in your browser — UTF-8 safe, privately.

HTML Entities Encode / Decode

Encode and decode HTML entities in your browser — privately.

URL Encode / Decode

Percent-encode and decode URLs, query params, and form values — in your browser.

Case Converter

Convert text between camelCase, snake_case, PascalCase, kebab-case and more — instantly.

CSV to JSON Converter

Convert CSV or TSV into JSON in your browser — RFC 4180 parser with auto-delimiter detection and type coercion.

Lorem Ipsum Generator

Generate placeholder Lorem Ipsum text — words, sentences, or paragraphs.

Markdown Preview

Live Markdown renderer with GFM, tables, task lists, and sanitized HTML — right in your browser.

Slugify

Convert strings to URL-safe slugs — Unicode-aware, client-side, zero deps.

Sort Lines

Sort, deduplicate, trim, and reorder lines of text with natural-number and case-insensitive ordering.

Text Diff

Compare two texts side-by-side with line and word-level highlighting — privately.

Word Counter

Count characters, words, lines, paragraphs, reading time.

XML Formatter

Format, validate, and pretty-print XML in your browser — privately.

YAML Formatter

Format, validate, and lint YAML in your browser — privately.

Cron Expression Parser

Explain cron schedules and preview the next 10 runs.

Date Difference Calculator

Calculate the difference between two dates in every unit.

ISO 8601 Parser

Parse and format ISO 8601 dates, durations, and intervals.

Timezone Converter

Convert between timezones with DST and multi-target support.

Unix Timestamp Converter

Convert between Unix epoch and human-readable dates

JWT Encoder

Sign and encode JSON Web Tokens — HS256, HS384, HS512.

MD5 Hash Generator

Compute MD5 digests and HMAC-MD5 in your browser — pure JavaScript, no upload.

NanoID Generator

Generate URL-safe unique IDs with configurable length and alphabet.

Password Generator

Strong, random passwords and passphrases with entropy.

SHA-256 Hash

Compute SHA-256, SHA-1, SHA-384, SHA-512 hashes in your browser — privately.

UUID Generator

Generate UUID v1, v4, v7 — bulk and validated.

Regex Explainer

Explain Regular Expressions in plain English.

Regex Tester

Test regex patterns live with groups, flags, replace.

DNS Lookup

Resolve any hostname to A, AAAA, MX, TXT, NS, CNAME, SOA, and CAA records — live, via Cloudflare DoH.

HTTP Status Codes

HTTP Status Code Reference — search every IANA code with retry guidance.

IPv4 CIDR Calculator

Subnet calculator — parse CIDR, split, supernet, and test containment in your browser.

Is My Website Alive?

Check if a site is up in under a second — TCP handshake, HTTP status, SSL expiry, response time. No install, no account.

What's My IP?

See your public IP address, user agent, and connection details — instantly, no tracking.

URL Parser

Break URLs into parts — scheme, host, port, path, query, fragment, IDN, and PSL.

User Agent Parser

Parse Browser User-Agent Strings — browser, OS, device, and bot detection.

Color Contrast Checker

Check WCAG 2.1 / 2.2 AA/AAA contrast and APCA Lc for any foreground/background pair — live preview, no server.

Color Converter

Convert a color between HEX, RGB, HSL, HSV, CMYK, OKLCH — with WCAG contrast and live swatches.

Image to ASCII Art

Turn any image into ASCII art — tune width, pick a character ramp, keep the colors. Every pixel stays in your browser.

Chmod Calculator

Unix file permissions converter — octal, symbolic, and checkbox grid, always in sync.

FIX Protocol Parser

Parse, validate, and pretty-print FIX 4.2 / 4.4 messages — checksums, body length, tag names.

JWT Decoder

Decode JSON Web Tokens — header, payload, signature.

MongoDB Query Builder

Build MongoDB find() queries visually — generate shell, Node driver, Mongoose, and pymongo code in one click.

Number Base Converter

Convert numbers between binary, octal, decimal, and hex — BigInt-safe, with bitwise ops.

SemVer Parser

Parse, compare, increment, and range-check Semantic Versioning strings.

Anthropic Messages API

Send prompts to Claude from your browser — streaming, system prompts, your key stays local.

HTTP Client

Send REST requests from your browser — import & export curl.

OpenAI Responses API

Test OpenAI's Responses API from your browser — streaming, structured outputs, your key stays local.

Snake Game (Matrix)

Classic snake, acid-green Matrix paint job. Arrow keys / WASD to move, swipe on mobile. Full source code on the page — zero deps, zero tracking.