Developer tools

Besides the DNS, mail and network checks, the iw Toolbox comes with around 80 small everyday tools: Base64, JWT, hashes, subnets, cron, regex and much more. All of them work without a license and run entirely locally on your device. Nothing you type leaves your computer, and that includes passwords, keys and tokens.

The quickest way to a tool is the search with ⌘ K (Windows and Linux: Ctrl K). English terms work too, such as subnet, hash or cron. Tools you use often go into FAVORITEN (favourites) via the star. See The interface.

Tool names below are the German labels from the app.

Netzwerk (network)

The calculators in the Netzwerk category. The checks in the same category, such as ping or the port check, need a license; these don’t.

Tool	What it does
IPv4-Subnetzrechner	network, broadcast, mask, host range and size of an IPv4 network
IPv4-Adressformate	an IPv4 address in decimal, hex, binary and as an IPv6-mapped address
IPv4-Bereich auflösen	splits a from–to range into the smallest list of CIDR blocks
MAC-Hersteller	finds the vendor of a MAC address using the bundled IEEE OUI list
MAC-Generator	random MAC addresses, optionally with a fixed prefix and format
IPv6-ULA-Generator	a unique local IPv6 prefix (fd00::/8) per RFC 4193

Krypto (crypto)

Tool	What it does
Token-Generator	random strings from selectable character classes
Hash-Text	MD5, SHA-1, SHA-2 and SHA3-256 of a text
Bcrypt	hash passwords with bcrypt and check them against an existing hash
UUID-Generator	version 4 and 7 UUIDs plus the nil UUID
ULID-Generator	sortable ULIDs; also reads the timestamp from a ULID
Text ver-/entschlüsseln	AES-256-GCM with a passphrase (PBKDF2), both ways
BIP39-Passphrase	generate and validate BIP39 word sequences
HMAC-Generator	HMAC over a text with a secret key
RSA-Schlüsselpaar	RSA key pair in PEM format (PKCS#8 and SPKI)
Passwortstärke	estimates entropy and cracking time of a password

Konverter (converters)

Tool	What it does
Datum/Uhrzeit	timestamps between ISO 8601, Unix time, RFC 2822 and HTTP date
Zahlensysteme	integers of any size between bases 2 to 64
Römische Zahlen	Arabic to Roman numerals and back (1 to 3999)
Base64 Text	encode text as Base64 and back
Base64 Datei	read a file as Base64 or a data URL
Farben	hex, RGB, HSL, HWB, CMYK and CSS names
Schreibweisen	camelCase, snake_case, kebab-case and more
NATO-Alphabet	spell out text and back
Text zu Binär	text as the bits of its UTF-8 bytes and back
Text zu Unicode	code points, \u escapes and HTML entities and back
YAML → JSON, YAML → TOML, JSON → YAML, JSON → TOML, TOML → JSON, TOML → YAML, XML → JSON, JSON → XML	convert between data formats
Listen-Konverter	split, sort, clean up and rejoin lists
Markdown → HTML	Markdown (GitHub flavour) to HTML

Web

Tool	What it does
URL kodieren/dekodieren	percent-encoding for URLs
HTML-Entities	escape special characters for HTML and resolve entities
URL-Parser	splits a URL into scheme, credentials, host, port, path, parameters and fragment
Basic-Auth-Header	create and read the Authorization header for HTTP Basic Auth
Open-Graph-Meta-Generator	Open Graph and Twitter Card meta tags
OTP-Codes	TOTP codes for a secret; new secrets with a QR code
MIME-Typen	MIME type for a file extension and vice versa
JWT-Parser	header and payload of a JSON Web Token with readable times
Tastencodes	name and codes of every key you press
Slugify	URL-safe slug from text, umlauts transliterated
User-Agent-Parser	browser, engine, OS and device from a user agent
HTTP-Statuscodes	searchable list of all status codes with a short explanation
JSON-Diff	compare two JSON documents structurally
Outlook-Safelink-Decoder	the real target URL from Microsoft Defender Safe Links

Entwicklung (development)

Tool	What it does
Git-Spickzettel	common Git commands with explanations, searchable and copyable
Zufälliger Port	a port between 1024 and 65535 not used by any well-known service
Crontab-Generator	explains cron expressions in German, shows the next runs, builds new expressions
JSON formatieren	pretty-print JSON, optionally with sorted keys
JSON verkleinern	strip all unnecessary whitespace from JSON
JSON zu CSV	a JSON array of objects as CSV with a header row
SQL formatieren	break SQL at the main clauses and indent it
chmod-Rechner	Unix file permissions between checkboxes, octal and rwx
docker run → Compose	a docker run command as a docker-compose.yml
XML formatieren	indent or compact XML
YAML formatieren	indent YAML consistently, optionally sorted
E-Mail normalisieren	email addresses in normal form: lower case, no +tag, Gmail without dots
Regex-Tester	test regular expressions live, groups as a table
Regex-Spickzettel	the most important regex syntax at a glance

Text

Tool	What it does
Lorem ipsum	placeholder text with a choice of paragraphs, sentences and words
Textstatistik	characters, words, lines, bytes and estimated reading time
Emoji-Auswahl	find emojis by name and copy them
Text verschleiern	replace a text with asterisks except for its first and last characters
Text-Diff	compare two texts line by line or character by character
Numeronym	shorten words like internationalization to i18n
ASCII-Art	text in large ASCII letters

Daten (data)

Tool	What it does
Telefonnummern	validate and format phone numbers: E.164, international, national, type
IBAN prüfen	length and check digits of an IBAN, split into bank code and account

Mathe und Einheiten (maths and units)

Tool	What it does
Rechenausdrücke	expressions like 2 * (3 + 4), sqrt(2) or sin(pi / 4)
Prozentrechner	X % of Y, share as a percentage, percentage change
Restzeit (ETA)	estimates from progress and start time when a task will be done
Stoppuhr	stopwatch with lap times
Temperatur	Celsius, Fahrenheit, Kelvin and historical scales

Bilder (images)

Tool	What it does
QR-Code	QR code from text or a URL, can be saved as PNG
WLAN-QR-Code	QR code that lets smartphones join your Wi-Fi without typing
SVG-Platzhalter	placeholder image as SVG or data URL in any size

Also: IP entsperren

The inwendo category holds IP entsperren (unblock IP), also free without a license. If inwendo’s servers have blocked your IP after too many failed attempts, the tool finds your public IP and unblocks it via inwendo’s IP unban service. You can also enter a different IP under IP-Adresse. Unlike the tools above, it needs the network for this: it looks up your own IP at ipify.org, and the unblock request goes to an inwendo server.