Tools

My IP and network

Local addresses, gateway, DNS and your public IP

• Uses the network

Subnet calculator

IPv4 and IPv6 CIDR: ranges, split, aggregate

Ping

ICMP or TCP ping with loss and round-trip times

• Uses the network

Port scan

TCP connect scan of one host: common or custom ports

• Uses the network

NTP query

Ask a time server for its time and compare it with this phone's clock

• Uses the network

MAC address tool

Convert MAC notations, derive EUI-64 and IPv6 forms, read the multicast and locally administered bits

Wake-on-LAN

Send a magic packet to wake a computer on your network

• Uses the network

Port reference

Look up well-known TCP and UDP ports by number, range or service name

DNS lookup

A, AAAA, MX, TXT, CAA and more, any resolver, DoH, DNSSEC flag

• Uses the network

WHOIS (RDAP)

Registrar, dates and nameservers for a domain; owner of an IP block or AS number

• Uses the network

curl builder

Build a curl command from a form for bash, PowerShell or cmd, or paste one to edit it

• Uses the network
• Sensitive input

HTTP Headers

Response headers, redirect chain, TLS and a security-header grade

• Uses the network

Certificate inspector

Decode PEM, DER and PKCS#7 certificates: chain, names, expiry, keys and fingerprints

• Sensitive input

HTTP status codes

Look up what an HTTP status code means, by code, class or name

HTTP header reference

Look up what a request or response header does, with security guidance

TLS probe

Handshake with one host and port: protocol, cipher, ALPN, trust and the certificate chain the server sends

• Uses the network

WebSocket client

Connect to a ws:// or wss:// endpoint, send text and read the messages that come back

• Uses the network

Base64

Encode and decode Base64 and Base64URL, text or files

Hex converter

Text and bytes to hex and back, with hex dump

URL encoder

Percent-encode and decode, parse query strings

Checksum & CRC

CRC-8 to CRC-64, Adler-32, Fletcher, custom CRC models, Luhn and mod 97

QR code

Generate and scan QR codes, including Wi-Fi

• Asks for camera when you use it
• Sensitive input

JSON formatter

Pretty-print, minify, validate and query JSON with JSONPath

YAML formatter

YAML to and from JSON, format and validate

XML formatter

Pretty-print, minify and check XML

SQL formatter

Format or minify SQL for standard, PostgreSQL, MySQL and SQLite, with keyword case and indent options

Format converter

Convert between JSON, YAML and CSV

• Sensitive input

Markdown preview

Render Markdown safely and export HTML

ASN.1 decoder

DER and PEM structure as a tree with OID names, offsets and lengths

• Sensitive input

ID decoder

Recognise UUID, ULID, KSUID, ObjectId, XID, TypeID and snowflake ids and read the time and fields inside

OID lookup

Name an object identifier, search the bundled table, and convert between dotted form and ASN.1 DER bytes

Protobuf decoder

Read a protocol buffers message without its schema: every field with each plausible reading of its value

CBOR decoder

Decode CBOR (RFC 8949) from hex or Base64 into diagnostic notation, with tags and well-formedness errors

Media types

Look up MIME media types by file extension, type name or purpose

JWT decoder

Decode JWT header and claims, check expiry and algorithm

• Sensitive input

Password generator

Random passwords and passphrases with entropy

• Generates secrets

Key generator

Random keys, IVs and RSA, EC and Ed25519 key pairs, never saved

• Generates secrets

Hash & HMAC

MD5, SHA-1, SHA-256, SHA-512 and HMAC for text or files

• Sensitive input

UUID

Generate v4 and v7 UUIDs, inspect version and timestamp

CVSS calculator

Score a CVSS 3.1 vector, or break a 4.0 vector into its equivalence levels

SIM and device ID check

Validate and explain ICCID, EID, IMSI and IMEI: check digits, MCC and MNC split, swapped-nibble hex

• Sensitive input

eSIM activation code

Check the format of an LPA activation code and read its fields; the matching ID stays hidden until you confirm

• Generates secrets

ATR decoder

Decode a smart card or SIM answer to reset: protocols, speed, historical bytes and the TCK check

TLV decoder

Decode BER-TLV (ISO 7816-4), SIMPLE-TLV and COMPREHENSION-TLV from smart cards and SIMs, with tag names

• Sensitive input

APDU decoder

Decode pasted smart card command and response APDUs: header, data, status words and risk tier. Reads text only; never talks to a card

• Sensitive input

SIM file decoder

Decode the content of SIM and USIM files from hex: ICCID, IMSI, service provider name, PLMN lists, service tables and more

• Sensitive input

NDEF decoder

Decode NFC tag messages from pasted hex or Base64: URI, text, Smart Poster, Wi-Fi, Bluetooth pairing and app records, with secrets hidden by default

• Sensitive input

NDEF capacity

Work out how many bytes an NDEF message needs and which NFC tag models hold it, from a URI, a text or a pasted message

NFC dump diff

Compare two NFC tag memory dumps page by page or block by block; UIDs and MIFARE sector keys are hidden by default

• Sensitive input

Cron builder

Explain cron, next runs, systemd OnCalendar

chmod calculator

Octal and rwx, special bits, umask

Unit converter

Convert length, data size, temperature, time and more with exact arithmetic

Timestamp converter

Epoch and ISO 8601, time zones, relative time

Number base

Binary, octal, decimal, hex and two's complement

Color tool

Convert hex, RGB, HSL, HSV and Android ARGB colours and check WCAG contrast

Images and PDF

Turn pictures into one PDF, or save PDF pages as pictures

• Sensitive input

Regex tester

Match, replace and inspect groups

Text diff

Compare two texts line by line or as a unified diff

String escape

Escape and unescape text for JSON, Java, Kotlin, C, shell, HTML and regex, and clean up log lines

Text case

Change text between camelCase, snake_case, kebab-case, Title Case, slugs and more

Unicode inspector

Code points, names, normal forms and hidden-character checks for any text

Text utils

Count words and lines, sort, deduplicate, clean up, number, join and split lines

Sensor dashboard

Live values and a five minute graph of the motion and environment sensors this device has

Compass

Magnetic or true heading from the rotation-vector sensor, with an optional declination

• Asks for location when you use it

Spirit level

A bubble level and inclinometer from the gravity sensor, with a zero point you can set