A QR code generator is an application which creates and stores different types of data in a QR code image file.
A qrencode is a free command line tool for encoding string data in the QR code and saving it as a PNG or an EPS image.
In this note i will show how to install and and how to use (with examples) the qrencode on Windows, Linux and MacOS from the command line. (more…)
There could be numerous reasons behind a computer running slow but the most common is a lack of RAM (memory) caused by too many programs running simultaneously, and you may wonder how much RAM do i have and how to check the RAM usage.
This note shows how to check the total amount of RAM and its usage on Windows, Linux and macOS from GUI and from a command line (terminal). (more…)
Sometimes it is requires to increase an image size without changing its pixels i.e. increase the size of a file without changing a quality, dimension or resolution of the image or photo.
You may need this for example in some applications or web-services that don’t allow to upload images if their size is less than some minimum, e.g. less than 50KB.
There is no need to search for some online “photo size increaser” or install any additional software as Windows, macOS and Linux users can easily increase an image size using the built-in command-line tools.
In this note i will show how to increase an image size without changing its pixels in Windows, macOS and Linux from the command line. (more…)
If you want to store a big folder as a single file, so it could be easily uploaded somewhere or shared with someone, you can create a simple zip archive from it.
To avoid wasting a time and resources on compression and decompression, this zip archive can be created without compression.
In this short note i will show how to create a zip file without compression from the command line on Windows, Linux and MacOS. (more…)
A router is a device that communicates between the Internet (or public network) and the devices in a local network (or private network).
A typical home router, that usually acts as a default gateway for the local devices, can be configured using a web-based configuration page that can be accessed from a web-browser if you know the router’s IP address.
In this note i will show how to find out the router’s IP address in Windows, Linux and MacOS from the command line. (more…)