# DevPrism

> One prism for everyday development chores — a spectrum of tools to encode, format, convert, generate, hash, and validate. Everything runs client-side in your browser; nothing is uploaded.

111 tools. Each is a single-page interactive utility that runs client-side in the browser — no data is uploaded or logged — unless a page is marked server-side. There is no API; link people to the tool page.

## Crypto & Security

Cryptography, hashing, tokens, and security utilities.

### Bcrypt

- URL: https://tool.danielchen.me/crypto/bcrypt
- Category: Crypto & Security
- Runs: client-side

Hash a string with bcrypt at a work factor you choose, or test a string against an existing bcrypt hash.

### Hash Text

- URL: https://tool.danielchen.me/crypto/hashtext
- Category: Crypto & Security
- Runs: client-side

Run text through MD5, SHA-1, SHA-256, SHA-3 and other digests, with each result shown in several encodings at once.

### HMAC Generator

- URL: https://tool.danielchen.me/crypto/hmac-generator
- Category: Crypto & Security
- Runs: client-side

Compute an HMAC signature from a message and secret key using the hash function of your choice.

### JWT Parser

- URL: https://tool.danielchen.me/crypto/jwt-parser
- Category: Crypto & Security
- Runs: client-side

Split a JSON Web Token into its header, payload, and signature and read the decoded claims.

### Password Strength Analyser

- URL: https://tool.danielchen.me/crypto/password-strength-analyser
- Category: Crypto & Security
- Runs: client-side

Estimate how long a password would take to crack and see which choices are weakening it.

### PDF Signature Checker

- URL: https://tool.danielchen.me/crypto/pdf-signature-checker
- Category: Crypto & Security
- Runs: client-side

Inspect the digital signatures embedded in a PDF and check whether the file changed after it was signed.

### RSA Key Pair Generator

- URL: https://tool.danielchen.me/crypto/rsa-key-pair-generator
- Category: Crypto & Security
- Runs: client-side

Generate a fresh RSA public and private key pair in PEM format at the key size you pick.

### String Obfuscator

- URL: https://tool.danielchen.me/crypto/string-obfuscator
- Category: Crypto & Security
- Runs: client-side

Mask the middle of a secret, IBAN, or token so it can be shared and recognised without exposing the whole value.

### Text Encryption

- URL: https://tool.danielchen.me/crypto/text-encryption
- Category: Crypto & Security
- Runs: client-side

Encrypt or decrypt a message with a passphrase using AES, TripleDES, Rabbit, or RC4.

### Token Generator

- URL: https://tool.danielchen.me/crypto/token
- Category: Crypto & Security
- Runs: client-side

Build a random token from the character sets you enable — lowercase, uppercase, digits, symbols — at any length.

### ULID Generator

- URL: https://tool.danielchen.me/crypto/ulid
- Category: Crypto & Security
- Runs: client-side

Create ULIDs, the time-sortable unique identifier, one at a time or in bulk, as plain text or JSON.

### UUID Generator

- URL: https://tool.danielchen.me/crypto/uuid
- Category: Crypto & Security
- Runs: client-side

Create RFC 4122 UUIDs (v1, v3, v4, v5) singly or in bulk, in several output formats.

## Development

Formatters, converters, and developer references.

### chmod Calculator

- URL: https://tool.danielchen.me/development/chmod-calculator
- Category: Development
- Runs: client-side

Toggle read, write, and execute bits for owner, group, and others to get the matching octal mode and chmod command.

### Crontab Generator

- URL: https://tool.danielchen.me/development/crontab-generator
- Category: Development
- Runs: client-side

Assemble a cron expression from plain-language options and read back exactly when it will run.

### Docker Run → Compose

- URL: https://tool.danielchen.me/development/docker-run-to-compose
- Category: Development
- Runs: client-side

Paste a docker run command and get the equivalent docker-compose service definition.

### Minecraft JAR Explorer

- URL: https://tool.danielchen.me/development/minecraft-jar-explorer
- Category: Development
- Runs: client-side

Open a Minecraft plugin or mod .jar in the browser to browse its files, preview them, and extract individual entries.

### Random Port Generator

- URL: https://tool.danielchen.me/development/random-port-generator
- Category: Development
- Runs: client-side

Pick a random TCP port from the ephemeral range, clear of the well-known ports below 1024.

### Regex Tester

- URL: https://tool.danielchen.me/development/regex-tester
- Category: Development
- Runs: client-side

Try a regular expression against sample text and watch every match and capture group highlight as you type.

### SQL Prettify

- URL: https://tool.danielchen.me/development/sql-prettify
- Category: Development
- Runs: client-side

Reformat a SQL query with clean indentation and consistent keyword casing across common dialects.

## Cheatsheets

Quick-reference guides for tools and syntax.

### .gitignore Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/gitignore-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for .gitignore pattern syntax, common entries per stack, and related git commands.

### ANSI Escape Codes Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/ansi-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for ANSI/VT100 escape codes — terminal colors, text styles, cursor movement, and clearing.

### Bash Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/bash-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Bash — redirection, variable expansion, globs, tests, control flow, and process management.

### Conventional Commits & SemVer Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/conventional-commits-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Conventional Commits message types and Semantic Versioning (MAJOR.MINOR.PATCH) rules.

### CSS Colors Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/css-colors-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for CSS color formats and functions — hex, rgb/hsl/oklch, keywords, gradients, and filters.

### CSS Selectors Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/css-selectors-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for CSS selectors — combinators, attribute selectors, pseudo-classes/elements, and specificity.

### curl Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/curl-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for curl — methods, request bodies, headers, auth, output options, and redirects.

### Date Format Tokens Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/date-format-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference mapping date/time format tokens across strftime, date-fns/Moment, and Go's reference layout.

### Docker Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/docker-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for the Docker CLI — running and managing containers, images, Compose, volumes, cleanup, and Dockerfile instructions.

### find Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/find-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for the find command — matching by name, type, size, and time, then acting on the results.

### Flexbox & Grid Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/flexbox-grid-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for CSS Flexbox and Grid — container and item properties, plus common layout recipes.

### Git Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/git-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Git — everyday commands, branching, undoing mistakes, stashing, remotes, and history search.

### Glob Patterns Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/glob-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for glob syntax across the shell, .gitignore-style files, and JS tooling (picomatch/fast-glob).

### Go Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/go-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Go — variables, slices & maps, structs & interfaces, goroutines/channels, and errors.

### grep & ripgrep Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/grep-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for grep and ripgrep (rg) — matching, context lines, and restricting search by file type.

### HTTP Methods Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/http-methods-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for HTTP methods, safe/idempotent/cacheable semantics, status code ranges, and common headers.

### JavaScript Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/javascript-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for modern JavaScript — array, string, object, and async/Promise built-ins.

### jq Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/jq-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for jq — filters, transforms, reductions, and string/regex helpers for JSON on the command line.

### kubectl Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/kubectl-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for kubectl — contexts, get/describe, logs & exec, applying manifests, and debugging.

### Make Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/make-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for GNU Make — rules, variables, automatic variables, functions, and CLI flags.

### Markdown Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/markdown-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Markdown — text formatting, lists, links, and GitHub Flavored Markdown extensions.

### Python Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/python-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Python — slicing, comprehensions, f-strings, functions, control flow, and type hints.

### Regex Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/regex-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A quick reference for JavaScript regular-expression syntax: tokens, character classes, groups, flags, and lookarounds.

### Rust Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/rust-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Rust — ownership & borrowing, pattern matching, iterators, traits, and Cargo.

### sed & awk Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/sed-awk-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for sed and awk — substitution, line selection, fields, and quick filters/aggregates.

### SQL Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/sql-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for SQL — queries, joins, aggregation, window functions, DDL, and CTEs.

### SSH Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/ssh-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for SSH, SCP, and rsync — connecting, keys, port forwarding, file transfer, and ~/.ssh/config.

### systemd Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/systemd-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for systemctl and journalctl — controlling services, inspecting units, and reading logs.

### TCP/UDP Ports Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/ports-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for well-known and commonly-used TCP/UDP ports — web, mail, infra, databases, and dev servers.

### tmux Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/tmux-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for tmux — sessions, windows, panes, copy mode, and config reloading.

### TypeScript Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/typescript-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for TypeScript — basic types, interfaces, generics, utility types, and conditional/mapped types.

### Vim Cheatsheet

- URL: https://tool.danielchen.me/cheatsheets/vim-cheatsheet
- Category: Cheatsheets
- Runs: client-side

A searchable quick reference for Vim/Neovim — modes, motions, editing, search & replace, windows, registers, and macros.

## JSON

Prettify, minify, diff, and convert JSON.

### JSON Diff

- URL: https://tool.danielchen.me/json/json-diff
- Category: JSON
- Runs: client-side

Compare two JSON documents and see added, removed, and changed values highlighted side by side.

### JSON Minify

- URL: https://tool.danielchen.me/json/json-minify
- Category: JSON
- Runs: client-side

Strip whitespace and line breaks from JSON to produce the smallest valid output.

### JSON Prettify

- URL: https://tool.danielchen.me/json/json-prettify
- Category: JSON
- Runs: client-side

Re-indent JSON with consistent spacing so it is easy to scan.

### JSON to CSV

- URL: https://tool.danielchen.me/json/json-to-csv
- Category: JSON
- Runs: client-side

Flatten an array of JSON objects into CSV, working out the column headers for you.

## XML

Format, lint, query, and convert XML.

### XML Formatter

- URL: https://tool.danielchen.me/xml/xml-formatter
- Category: XML
- Runs: client-side

Re-indent an XML document with consistent spacing and line breaks.

### XML Linter

- URL: https://tool.danielchen.me/xml/xml-linter
- Category: XML
- Runs: client-side

Check whether an XML document is well-formed and point to the first place parsing fails.

### XML to HTML

- URL: https://tool.danielchen.me/xml/xml-to-html
- Category: XML
- Runs: client-side

Render an XML document as a nested HTML table and copy the generated markup.

### XML to JSON

- URL: https://tool.danielchen.me/xml/xml-to-json
- Category: XML
- Runs: client-side

Convert an XML document into JSON, keeping attributes as @-prefixed keys.

### XPath Tester

- URL: https://tool.danielchen.me/xml/xpath-tester
- Category: XML
- Runs: client-side

Evaluate an XPath expression against an XML document and inspect the nodes it selects.

### XSLT Tester

- URL: https://tool.danielchen.me/xml/xslt-tester
- Category: XML
- Runs: client-side

Apply an XSLT stylesheet to an XML document and see the transformed result.

## YAML

Format, merge, flatten, and convert YAML.

### YAML Flattener / Unflattener

- URL: https://tool.danielchen.me/yaml/yaml-flattener
- Category: YAML
- Runs: client-side

Flatten nested YAML into dotted keys, or expand dotted keys back into nested structure.

### YAML Merger

- URL: https://tool.danielchen.me/yaml/yaml-merger
- Category: YAML
- Runs: client-side

Deep-merge two or more YAML documents, with each one overriding the values before it.

### YAML Prettify

- URL: https://tool.danielchen.me/yaml/yaml-prettify
- Category: YAML
- Runs: client-side

Re-dump a YAML document with consistent indentation, optionally sorting the keys.

### YAML to JSON

- URL: https://tool.danielchen.me/yaml/yaml-to-json
- Category: YAML
- Runs: client-side

Convert YAML into JSON, including multi-document streams.

### YAML to TOML

- URL: https://tool.danielchen.me/yaml/yaml-to-toml
- Category: YAML
- Runs: client-side

Convert a YAML mapping into equivalent TOML.

## Network

IP, subnet, MAC, and networking tools.

### IPv4 Address Converter

- URL: https://tool.danielchen.me/network/ipv4-address-converter
- Category: Network
- Runs: client-side

See an IPv4 address written as decimal, hexadecimal, binary, and its IPv6-mapped form.

### IPv4 Range Expander

- URL: https://tool.danielchen.me/network/ipv4-range-expander
- Category: Network
- Runs: client-side

Enter the first and last address of a range and get the smallest CIDR block that covers it.

### IPv4 Subnet Calculator

- URL: https://tool.danielchen.me/network/ipv4-subnet-calculator
- Category: Network
- Runs: client-side

Break an IPv4 CIDR block down into its network and broadcast address, usable host range, mask, and size.

### IPv6 ULA Generator

- URL: https://tool.danielchen.me/network/ipv6-ula-generator
- Category: Network
- Runs: client-side

Roll a random IPv6 unique local address prefix (fd00::/8) for private networks, following RFC 4193.

### MAC Address Generator

- URL: https://tool.danielchen.me/network/mac-address-generator
- Category: Network
- Runs: client-side

Generate one or many random MAC addresses with a fixed prefix, case, and separator of your choosing.

### MAC Address Lookup

- URL: https://tool.danielchen.me/network/mac-address-lookup
- Category: Network
- Runs: client-side

Look up the hardware vendor registered to a MAC address or OUI prefix.

## Web

URLs, HTTP, headers, and browser utilities.

### Basic Auth Generator

- URL: https://tool.danielchen.me/web/basic-auth-generator
- Category: Web
- Runs: client-side

Combine a username and password into the Base64 value for an HTTP Basic Authorization header.

### Device Info

- URL: https://tool.danielchen.me/web/device-info
- Category: Web
- Runs: client-side

Read back what the browser exposes about your screen, viewport, platform, and capabilities.

### Email Normalizer

- URL: https://tool.danielchen.me/web/email-normalizer
- Category: Web
- Runs: client-side

Reduce an email address to a canonical form — lowercasing, dropping dots and +tags — so duplicates line up.

### HTML Entities Escaper

- URL: https://tool.danielchen.me/web/html-entities-escaper
- Category: Web
- Runs: client-side

Convert reserved characters like <, >, and & into HTML entities, or turn entities back into characters.

### HTML WYSIWYG Editor

- URL: https://tool.danielchen.me/web/html-wysiwyg-editor
- Category: Web
- Runs: client-side

Edit rich text visually and get the matching HTML source updated as you type.

### HTTP Status Codes

- URL: https://tool.danielchen.me/web/http-status-codes
- Category: Web
- Runs: client-side

Browse every HTTP status code with its short name and what it signals.

### Keycode Info

- URL: https://tool.danielchen.me/web/keycode-info
- Category: Web
- Runs: client-side

Press any key to see its JavaScript key, code, keyCode, location, and active modifiers.

### MIME Types

- URL: https://tool.danielchen.me/web/mime-types
- Category: Web
- Runs: client-side

Look up the MIME type for a file extension, or the extensions tied to a MIME type.

### OG Meta Generator

- URL: https://tool.danielchen.me/web/og-meta-generator
- Category: Web
- Runs: client-side

Fill in a short form to generate the Open Graph and Twitter Card meta tags for a page.

### Outlook Safelink Decoder

- URL: https://tool.danielchen.me/web/outlook-safelink-decoder
- Category: Web
- Runs: client-side

Recover the original link wrapped inside an Outlook SafeLinks URL.

### Slugify String

- URL: https://tool.danielchen.me/web/slugify-string
- Category: Web
- Runs: client-side

Turn a phrase into a lowercase, hyphenated slug that is safe for URLs, filenames, and IDs.

### URL Encoder / Decoder

- URL: https://tool.danielchen.me/web/url/encoder
- Category: Web
- Runs: client-side

Percent-encode text for safe use in a URL, or decode a percent-encoded string back to plain text.

### URL Parser

- URL: https://tool.danielchen.me/web/url/parser
- Category: Web
- Runs: client-side

Break a URL into its parts: scheme, host, port, path, query parameters, and credentials.

### URL Redirect Checker

- URL: https://tool.danielchen.me/web/url/redirect-checker
- Category: Web
- Runs: server-side

Follow every hop in a URL's redirect chain and see the status code and target at each step.

### User-Agent Parser

- URL: https://tool.danielchen.me/web/user-agent-parser
- Category: Web
- Runs: client-side

Pull the browser, engine, operating system, CPU, and device out of a user-agent string.

## Text

Text manipulation, statistics, and generation.

### ASCII Art Text Generator

- URL: https://tool.danielchen.me/text/ascii-art-text-generator
- Category: Text
- Runs: client-side

Turn a line of text into large ASCII-art lettering, choosing from a range of FIGlet fonts.

### Emoji Picker

- URL: https://tool.danielchen.me/text/emoji-picker
- Category: Text
- Runs: client-side

Search and copy emoji along with their name, Unicode codepoints, and shortcode.

### Lorem Ipsum Generator

- URL: https://tool.danielchen.me/text/lorem-ipsum-generator
- Category: Text
- Runs: client-side

Generate filler paragraphs, sentences, or words of lorem ipsum for mockups and layout work.

### Numeronym Generator

- URL: https://tool.danielchen.me/text/numeronym-generator
- Category: Text
- Runs: client-side

Shorten words to numeronyms such as i18n or a11y, and expand them back again.

### Text Diff

- URL: https://tool.danielchen.me/text/text-diff
- Category: Text
- Runs: client-side

Compare two blocks of text and highlight what changed — by line, by word, or by character.

### Text Statistics

- URL: https://tool.danielchen.me/text/text-statistics
- Category: Text
- Runs: client-side

Count characters, words, lines, and byte size for any block of text as you type.

## Calculators

Expression evaluation and everyday calculators.

### Amortization Calculator

- URL: https://tool.danielchen.me/calculators/amortization-calculator
- Category: Calculators
- Runs: client-side

Calculate the monthly payment on a loan and see the full principal/interest schedule.

### BMI Calculator

- URL: https://tool.danielchen.me/calculators/bmi-calculator
- Category: Calculators
- Runs: client-side

Calculate Body Mass Index from your weight and height, in metric or imperial units.

### Geo Distance Calculator

- URL: https://tool.danielchen.me/calculators/geo-distance-calculator
- Category: Calculators
- Runs: client-side

Calculate the great-circle distance and initial bearing between two latitude/longitude points.

### Math Evaluator

- URL: https://tool.danielchen.me/calculators/math-evaluator
- Category: Calculators
- Runs: client-side

Type a mathematical expression and get the result, with support for functions like sqrt, sin, and log.

### Resistor Calculator

- URL: https://tool.danielchen.me/calculators/resistor-calculator
- Category: Calculators
- Runs: client-side

Decode a resistor's color bands into its resistance and tolerance, or the reverse — type a value to get the bands.

### Running Pace Calculator

- URL: https://tool.danielchen.me/calculators/running-pace-calculator
- Category: Calculators
- Runs: client-side

Solve for time, pace, or distance from the other two, with quick presets for common race distances.

### Tip Calculator

- URL: https://tool.danielchen.me/calculators/tip-calculator
- Category: Calculators
- Runs: client-side

Work out the tip and total on a bill, and split it evenly between any number of people.

## Barcode & QR

Read and generate barcodes, QR codes, and GTINs.

### Barcode Generator

- URL: https://tool.danielchen.me/barcode/barcode-generator
- Category: Barcode & QR
- Runs: client-side

Generate 1D and 2D barcodes — Code 128, EAN, UPC, ITF, Data Matrix, PDF417, Aztec and more — and save them as PNG or SVG.

### Barcode Reader

- URL: https://tool.danielchen.me/barcode/barcode-reader
- Category: Barcode & QR
- Runs: client-side

Read a barcode or QR code from an uploaded image or a live camera feed.

### EPC QR Code Generator

- URL: https://tool.danielchen.me/barcode/epc-qr-code-generator
- Category: Barcode & QR
- Runs: client-side

Build a SEPA credit-transfer QR code (GiroCode / EPC069-12) that a banking app can scan to prefill a payment.

### GTIN Validator

- URL: https://tool.danielchen.me/barcode/gtin-validator
- Category: Barcode & QR
- Runs: client-side

Check the GS1 check digit of a GTIN-8, GTIN-12, GTIN-13 (EAN-13), or GTIN-14 barcode number.

### QR Code Decoder

- URL: https://tool.danielchen.me/barcode/qr-code-decoder
- Category: Barcode & QR
- Runs: client-side

Read a QR code from an image or your camera and work out what kind of content it carries.

### QR Code Generator

- URL: https://tool.danielchen.me/barcode/qr-code-generator
- Category: Barcode & QR
- Runs: client-side

Turn a URL or any text into a QR code, set the error-correction level, and download it.

### QR Contact Info Generator

- URL: https://tool.danielchen.me/barcode/qr-contact-info-generator
- Category: Barcode & QR
- Runs: client-side

Enter contact details and get a vCard QR code that scans straight into a phone’s address book.

### Wi-Fi QR Code Generator

- URL: https://tool.danielchen.me/barcode/wifi-qr-code-generator
- Category: Barcode & QR
- Runs: client-side

Create a QR code that joins a phone to your Wi-Fi network in one scan.

## Images & Media

Image generation and media utilities.

### Placeholder Generator

- URL: https://tool.danielchen.me/images-videos/placeholder-generator
- Category: Images & Media
- Runs: client-side

Build a placeholder image at any size — pick colours, a label, and a pattern, then export it as SVG, PNG, JPEG, or WebP with ready-made HTML, CSS, and Markdown snippets.

## Generators

Random data and identifier generators.

### BIP39 Mnemonic Generator

- URL: https://tool.danielchen.me/generator/bip39
- Category: Generators
- Runs: client-side

Generate a BIP39 recovery phrase from random entropy, or paste a phrase to recover the entropy behind it. Multiple wordlists supported.

### OTP Generator

- URL: https://tool.danielchen.me/generator/otp
- Category: Generators
- Runs: client-side

Generate live TOTP and HOTP codes from a Base32 secret, with a scannable QR code for authenticator apps.