Developer tools
Handle small developer and operations tasks such as QR code generation in the browser, then save or copy the result immediately.
Developer tools
UUID Generator — Browser Random Tool
generates an RFC 4122 UUID. Results are generated in your browser.
Korean Corporate and Resident ID Format Validator — Browser Everyday Tool
checks Korean corporate registration and resident registration number formats in the browser. Input is processed only in your browser.
QR Code Generator — Text & URL to QR
Generate downloadable QR images for text, URLs, Wi-Fi, email, and phone values.
Barcode Generator — Code 39 SVG
Generate a Code 39 SVG barcode from uppercase letters, digits, and supported symbols.
Code to Image — Developer Share Image
Render a code snippet into a PNG image.
JSON to CSV Converter — Browser Data Format Tool
Convert JSON data to CSV in your browser. Input is not sent to a server.
CSV to JSON Converter — Browser Data Format Tool
Convert CSV data to JSON in your browser. Input is not sent to a server.
JSON to YAML Converter — Browser Data Format Tool
Convert JSON data to YAML in your browser. Input is not sent to a server.
YAML to JSON Converter — Browser Data Format Tool
Convert YAML data to JSON in your browser. Input is not sent to a server.
JSON to TOML Converter — Browser Data Format Tool
Convert JSON data to TOML in your browser. Input is not sent to a server.
TOML to JSON Converter — Browser Data Format Tool
Convert TOML data to JSON in your browser. Input is not sent to a server.
JSON to XML Converter — Browser Data Format Tool
Convert JSON data to XML in your browser. Input is not sent to a server.
XML to JSON Converter — Browser Data Format Tool
Convert XML data to JSON in your browser. Input is not sent to a server.
YAML to TOML Converter — Browser Data Format Tool
Convert YAML data to TOML in your browser. Input is not sent to a server.
TOML to YAML Converter — Browser Data Format Tool
Convert TOML data to YAML in your browser. Input is not sent to a server.
CSV to YAML Converter — Browser Data Format Tool
Convert CSV data to YAML in your browser. Input is not sent to a server.
YAML to CSV Converter — Browser Data Format Tool
Convert YAML data to CSV in your browser. Input is not sent to a server.
CSV to TSV Converter — Browser Data Format Tool
Convert CSV data to TSV in your browser. Input is not sent to a server.
TSV to CSV Converter — Browser Data Format Tool
Convert TSV data to CSV in your browser. Input is not sent to a server.
XML to YAML Converter — Browser Data Format Tool
Convert XML data to YAML in your browser. Input is not sent to a server.
YAML to XML Converter — Browser Data Format Tool
Convert YAML data to XML in your browser. Input is not sent to a server.
JSON to TypeScript Generator — Browser Type Tool
Generate TypeScript interfaces and types from a JSON sample.
JSON to Zod Generator — Browser Type Tool
Generate a Zod object schema and inferred type from a JSON sample.
JSON to JSON Schema Generator — Browser Type Tool
Generate a JSON Schema draft-style schema from a JSON sample.
JSON to GraphQL Generator — Browser Type Tool
Generate GraphQL SDL types from a JSON sample.
JSON to Go Generator — Browser Type Tool
Generate Go structs with json tags from a JSON sample.
JSON to Rust Generator — Browser Type Tool
Generate Rust serde structs from a JSON sample.
JSON Formatter and Validator — Browser Developer Tool
parses, formats, or minifies JSON. Input is processed in your browser.
Base64 Encoder and Decoder — Browser Developer Tool
encodes text to Base64 or decodes Base64 to text. Input is processed in your browser.
URL Encoder and Decoder — Browser Developer Tool
percent-encodes or decodes URL text. Input is processed in your browser.
HTML Entity Converter — Browser Developer Tool
escapes HTML special characters or restores entities. Input is processed in your browser.
JWT Decoder — Browser Developer Tool
decodes JWT header and payload without verifying the signature. Input is processed in your browser.
Hash Generator — Browser Developer Tool
generates SHA-256 or SHA-1 hashes from text. Input is processed in your browser.
HMAC Generator — Browser Developer Tool
generates an HMAC-SHA256 value from a key and message. Input is processed in your browser.
Regex Tester — Browser Developer Tool
checks matches between a regular expression and test text. Input is processed in your browser.
SQL Formatter — Browser Developer Tool
adds readable line breaks around common SQL keywords. Input is processed in your browser.
XML Formatter — Browser Developer Tool
indents XML tag structure. Input is processed in your browser.
HTML Formatter — Browser Developer Tool
indents HTML tag structure. Input is processed in your browser.
CSS Minifier — Browser Developer Tool
removes CSS comments and unnecessary whitespace. Input is processed in your browser.
JavaScript Minifier — Browser Developer Tool
removes JavaScript comments and unnecessary whitespace. Input is processed in your browser.
Markdown Preview — Browser Developer Tool
converts Markdown text to a simple HTML preview string. Input is processed in your browser.
String Escape and Unescape — Browser Developer Tool
escapes or unescapes string control characters. Input is processed in your browser.
Regex Escape — Browser Developer Tool
escapes regular expression metacharacters for literal search. Input is processed in your browser.
Cron Parser — Browser Developer Tool
explains a 5-field cron expression in readable text. Input is processed in your browser.
Gitignore Generator — Browser Developer Tool
generates a .gitignore template from project keywords. Input is processed in your browser.
Dockerignore Generator — Browser Developer Tool
generates a .dockerignore template. Input is processed in your browser.
MIME Type Lookup — Browser Developer Tool
looks up mappings between file extensions and MIME types. Input is processed in your browser.
HTTP Status Code Lookup — Browser Developer Tool
looks up HTTP status code names and meanings. Input is processed in your browser.
User-Agent Parser — Browser Developer Tool
estimates browser, OS, and device from a User-Agent string. Input is processed in your browser.
CIDR Calculator — Browser Developer Tool
calculates network range and host count from CIDR notation. Input is processed in your browser.
IPv4 Subnet Calculator — Browser Developer Tool
calculates subnet details from IPv4 and prefix length. Input is processed in your browser.
htpasswd Generator — Browser Developer Tool
generates an Apache htpasswd {SHA} line from a username and password. Input is processed in your browser.
Unix Timestamp Converter — Browser Developer Tool
converts Unix timestamps and ISO dates. Input is processed in your browser.
Number Base Converter — Binary, Octal, Decimal, Hex
Convert integers between binary, octal, decimal, hexadecimal, and any base from 2 to 36 in your browser.
Binary Translator — Text to Binary and Back
Translate text to UTF-8 binary or hex bytes and decode binary back to text, all in your browser.
Binary Calculator — Add, Subtract, AND, OR, XOR, Shift
Add, subtract, multiply, and divide binary numbers or apply AND, OR, XOR, NOT, and bit shifts, with results in binary, decimal, and hex.
ASCII Table — Character Codes 0–127 Lookup
Full ASCII 0–127 reference table plus instant lookup from character to decimal, hex, octal, and binary codes.
Unicode Inspector — Code Points, UTF-8 and UTF-16 Bytes
Break a string into characters and see each code point (U+), UTF-8 bytes, UTF-16 units, and the character name or block.
Chmod Calculator — 755 and Symbolic Permissions
Convert Linux file permissions between rwx checkboxes, octal (755), and symbolic notation (rwxr-xr-x) in real time.
URL Parser — Split URLs and Edit Query Params
Break a URL into protocol, host, path, query, and fragment, then edit query parameters in a table and rebuild the URL.
Punycode Converter — IDN to xn-- and Back
Convert internationalized domain names (IDN) with Unicode characters to xn-- punycode and decode punycode back to Unicode.
Bcrypt Hash Generator and Verifier
Generate bcrypt password hashes in your browser and verify whether a password matches an existing hash.
Port Number Lookup — Well-Known Ports
Search well-known TCP/UDP port numbers like 22, 80, 443, and 3306 and see which service uses each.
Random MAC Address Generator
Generate random MAC addresses for testing and development, with a locally-administered bit option and colon, hyphen, or dot formats.
Credit Card Number Validator — Luhn Check and Brand
Check whether a card number passes the Luhn checksum and detect the brand (Visa, Mastercard, etc.). The number never leaves your browser.
Meta Tag Generator — Title, Description, Canonical, Robots
Generate ready-to-paste title, meta description, canonical, and robots tags with length gauges. Input is processed in your browser.
Open Graph Generator — OG & Twitter Card Tags with Preview
Generate Open Graph and Twitter Card meta tags and preview the share card. Input is processed in your browser.
Google SERP Preview — Snippet Truncation Simulator
Preview how your title, URL, and meta description appear in Google results on desktop and mobile, with pixel-width truncation markers.
Robots.txt Generator — with AI Crawler (GPTBot) Presets
Build a robots.txt from User-agent, Allow, Disallow, and Sitemap rules, with one-click presets to allow or block AI crawlers like GPTBot, PerplexityBot, and CCBot.
Sitemap XML Generator — Paste URLs, Get sitemap.xml
Paste a URL list and generate a standards-compliant sitemap.xml with optional lastmod, changefreq, and priority. Runs in your browser.
.htaccess Redirect Generator — 301, www, Force HTTPS
Generate .htaccess snippets for 301/302 redirects, www/non-www canonical host, and HTTPS enforcement. Apache only.
Hreflang Tag Generator — Multilingual Link Set with x-default
Enter language codes and URLs to generate a complete hreflang link tag set including x-default for multilingual SEO.
HTML to Markdown Converter — Instant, In-Browser
Paste HTML and convert it to Markdown with the Turndown library. Input is processed in your browser.
Markdown to HTML Converter — Paste MD, Get HTML
Convert Markdown into HTML code with headings, lists, code blocks, links, and images. Runs entirely in your browser.
QR Code Scanner — Read QR from an Image
Upload or paste an image containing a QR code and decode it in your browser. The image is never sent to a server.
Browser CSR Generator — RSA Private Key and Certificate Request PEM
Generate an RSA-SHA256 PKCS#10 CSR and private key PEM from domain details in your browser. The private key is not sent to a server.
SSH Key Generator (ed25519) — Browser OpenSSH Key Pair
Generate an ed25519 SSH public key and OpenSSH private key in your browser. Keys are not sent to a server.
WireGuard Key Pair Generator — Browser X25519 Keys
Generate WireGuard private/public keys and an optional preshared key in your browser. Keys are not sent to a server.
Korean Business Registration Number Validator — 10-Digit Checksum
Validate the format and checksum of a Korean business registration number in your browser. It does not look up company status or generate numbers.
JWT Signer — Browser HS256 Token Generator
Create an HS256 JWT from header/payload JSON and a secret in your browser. The secret is not sent to or stored on a server.
SPF Record Generator — Email Sender TXT Builder
Build an SPF TXT record from domain, include, ip4/ip6, a, mx, and all policy settings in your browser.
DKIM Record Generator — selector._domainkey TXT Builder
Create a DKIM DNS host and TXT value from selector, domain, and public key in your browser. It does not generate or store private keys.
DMARC Record Generator — p=none/quarantine/reject Policy Builder
Build a _dmarc TXT record from DMARC p/sp/pct/rua/ruf/adkim/aspf tags in your browser.
.env to JSON/YAML Converter — Browser Developer Tool
converts .env settings to JSON/YAML or turns a JSON object back into .env format. Input is processed only in your browser.
JSON Structure Diff — Browser Developer Tool
compares key structure and value types between two JSON documents. Input is processed only in your browser.
HTTP Request Builder — Browser Developer Tool
turns a small request spec into curl, fetch, or httpie commands. Input is processed only in your browser.
BIND Zone File Generator — Browser Developer Tool
generates a basic DNS zone file from domain, IP, and mail server inputs. Input is processed only in your browser.
UUID v7/ULID Time Decoder — Browser Developer Tool
extracts creation time from UUID v7 or ULID strings. Input is processed only in your browser.
Webhook Payload Mock Generator — Browser Developer Tool
generates sample GitHub, Stripe, or Slack event JSON payloads. Input is processed only in your browser.
Regex Pattern Library — Browser Developer Tool
shows common validation regexes and match results for input text. Input is processed only in your browser.
CORS Config Generator — Browser Developer Tool
generates example CORS response headers from a request scenario. Input is processed only in your browser.
docker run to Compose Converter — Browser DevOps Tool
turns a single docker run command into a Compose service draft. Input is processed only in your browser.
crontab ↔ systemd Timer Converter — Browser DevOps Tool
converts between one cron line and a basic systemd OnCalendar timer. Input is processed only in your browser.
CSP Builder and Analyzer — Browser DevOps Tool
builds a Content-Security-Policy header draft with review notes. Input is processed only in your browser.
curl to Code Converter — Browser DevOps Tool
turns a curl command into fetch, Axios, or Python requests code drafts. Input is processed only in your browser.
Regex Explainer — Browser DevOps Tool
explains JavaScript regular expressions as token-level notes. Input is processed only in your browser.
TOTP Secret and QR Generator — Browser DevOps Tool
generates a TOTP base32 secret, otpauth URI, and QR code in the browser. Input is processed only in your browser.
Korean Dummy Data Generator — Browser Developer Helper
generates Korean test names, example emails, reserved phone numbers, and fictional addresses. Input is processed only in your browser.
AI Answer Verifier — Browser Developer Helper
compares numeric, JSON, and text answers from an AI response against an expected value locally. Input is processed only in your browser.
Widget Result Badge Generator — Browser Developer Helper
turns a result value into SVG, Markdown, or HTML badges for docs and external widgets. Input is processed only in your browser.
FAQ
Is QR input stored?
No. QR generation runs in the browser and the input is not stored on a server.
Can I encode text that is not a URL?
Yes. Plain text, URLs, contact strings and other values can be encoded as QR codes.
Are JSON and Base64 tools included?
Yes. JSON formatting and validation, Base64 encoding and decoding, hash generation and data format converters are available.
Is code or data sent to a server?
No. Developer tools process input in the browser and nothing is sent to a server.