Guides

Strong passwords are your first line of defense against unauthorized access. Here's how to create passwords that are virtually uncrackable:

Length matters most. A 16-character password is exponentially stronger than an 8-character one. Aim for at least 12 characters, ideally 16+.

Use all character types. Mix uppercase letters, lowercase letters, numbers, and symbols. Each additional character type multiplies the possible combinations.

Avoid personal information. Never use names, birthdays, addresses, pet names, or any information that can be found on social media.

Don't reuse passwords. Every account should have a unique password. If one site is breached, your other accounts remain safe.

Use a password manager. Tools like Bitwarden (free), 1Password, or KeePass let you store unique, strong passwords for every account. You only remember one master password.

Enable two-factor authentication (2FA). Even the strongest password benefits from a second verification step. Use an authenticator app rather than SMS when possible.

QR (Quick Response) codes are two-dimensional barcodes that can store URLs, text, contact information, WiFi credentials, and more.

How they work: QR codes encode data in a matrix of black and white squares. Smartphone cameras use the three large squares in the corners for alignment, then read the pattern to decode the data.

Static vs Dynamic: Static QR codes (like those generated on RandoFox) encode data directly — they never expire and work offline. Dynamic QR codes redirect through a server and can be updated, but require an active internet connection and a paid service.

What you can encode: URLs (most common), plain text, WiFi network credentials (connect with a scan!), vCard contact info, email addresses, phone numbers, SMS messages, and geographic coordinates.

Error correction: QR codes include redundancy, so they can be read even if partially damaged. The standard error correction level allows up to 15% of the code to be obscured.

Best practices for printing: Maintain high contrast (dark on light), include quiet zone (white space around the code), minimum size 2cm for close scanning, and always test your QR code before mass printing.

Different barcode formats serve different purposes. Here's when to use each:

UPC-A (Universal Product Code): 12 numeric digits. Used for retail products in the US and Canada. Requires a registered GS1 Company Prefix for legitimate retail use.

EAN-13 (European Article Number): 13 numeric digits. The international standard for retail products. Includes a country prefix. UPC-A is actually a subset of EAN-13.

Code 128: Variable length, supports all 128 ASCII characters. The most versatile barcode format. Used for shipping labels, inventory, and any application needing alphanumeric encoding.

Code 39: Variable length, supports uppercase letters, digits, and some symbols. Common in military (LOGMARS), automotive (AIAG), and healthcare. Self-checking (no check digit required).

ITF-14 (Interleaved 2 of 5): 14 numeric digits. Used on outer cartons and packaging (not individual products). The thick bars make it readable even on corrugated cardboard.

QR Code: 2D format that can store thousands of characters. Best for mobile scanning, marketing, and encoding complex data like URLs or contact information.