Aggregating Useful Tools and Technical Resources

From format conversion and text utilities to QR codes, IP lookup, and resource integration — one minimal hub, tools at your fingertips.

Latest Articles

• Why Do Photos Rotate After Upload? The Role of Exif
  Sometimes a photo looks fine on your phone or computer, but rotates after being uploaded. This happens due to the Exif orientation metadata. This article explains the reason and suggests tools to fix it.
  Published: 2025-09-22
• What is Exif
  Exif (Exchangeable Image File Format) is a metadata standard embedded in image files, storing details such as device, time, aperture, shutter speed, and GPS location. It is useful in photo management, photography learning, and forensics, but may also pose privacy risks.
  Published: 2025-09-22
• Public vs Private IP Addresses
  Public and private IP addresses differ in definition, usage, accessibility, and cost. This article compares them with a clear table, includes a network topology diagram, and provides useful online tools.
  Published: 2025-09-22
• Differences Between QR Codes and Barcodes
  QR codes and barcodes differ in appearance, storage capacity, scanning method, and application scenarios. This article compares their features, pros and cons, and use cases.
  Published: 2025-09-15
• How to Find Your IP Address on Common Operating Systems
  This article shows how to get your IP address on Windows, Linux, macOS, Android, and iOS. Examples include both local/private IP and public IP using curl.
  Published: 2025-09-14
• How to Migrate Docker Data Directory to a New Path (with Automation Script)
  This article introduces an enhanced Docker data migration script. It is recommended to use the online script for quick migration, while the full script is also provided for reference.
  Published: 2025-09-12
• Windows ipconfig Common Command Guide
  This article lists the most common ipconfig commands in Windows, explaining their purposes and when to use them to quickly configure and troubleshoot network settings.
  Published: 2025-08-15
• CentOS 7 Yum Repo Fix with One-click Script
  CentOS 7 reached EOL in June 2024 and its Yum repos were taken offline. This article explains the issue and provides a one-click script to quickly switch to Vault repos or migrate to Rocky/AlmaLinux.
  Published: 2025-08-14
• Windows ipconfig Command Guide and Troubleshooting
  This article explains how to use the ipconfig command in Windows, including common parameters, usage examples, and tips for troubleshooting network issues.
  Published: 2025-08-14