1. Choose a tool
Pick the tool that fits your goal from the home page, tool list, or category list.
How to use
How to use
This page collects the basic flow for first-time use and links to each tool's usage guide.
Getting started
Start with this flow
A short flow to help first-time users begin without confusion.
2. Try it right away
Add your file or text and check the result while adjusting the on-screen settings.
3. Save and move on
Download, copy, or move to a related tool and continue to the next step from the same page.
Usage notes
Things to check first
Only the points worth checking before you start are summarized here.
Handling files
For tools that work with images or text, the basic flow is to review the result first and then save or copy it directly.
Using a smartphone
You can use the tools on mobile, but detailed adjustments and large text input are often easier on a desktop computer.
Checking the result
Reviewing the before-and-after result before saving or copying helps reduce mistakes.
Use cases
Find by what you want to do
If you already know your goal, you can go from a relevant entry point to the detailed guide.
Recommended
Start here
Start with the guides that are easiest to check the first time you use the site.
How to use Image Format Conversion
This guide explains how to choose an image, select the output format, and download the result after checking the preview.
View guide
How to use Image Crop & Resize
This guide explains how to choose an image, adjust the crop area and output size, and save the result.
View guide
How to generate a QR code
Learn how to create a QR code from a URL or text, adjust the size and colors, and save it as PNG or SVG.
View guide
Tool how-to
Guides for each tool
If you want step-by-step instructions for a specific tool, open its detailed guide.
How to use Image Format Conversion
This guide explains how to choose an image, select the output format, and download the result after checking the preview.
View guideHow to use Image Crop & Resize
This guide explains how to choose an image, adjust the crop area and output size, and save the result.
View guideHow to generate a QR code
Learn how to create a QR code from a URL or text, adjust the size and colors, and save it as PNG or SVG.
View guideHow to use JSON Formatter
This guide explains how to paste JSON, format it, validate the structure, and copy the result.
View guide
How to use Markdown Preview
This guide explains how to edit Markdown, switch themes, and review the preview while changing the view mode.
View guide
How to use Mermaid Preview
This guide explains how to enter Mermaid syntax and review the diagram and errors as you work.
View guide
How to use IP & Network Information Checker
This guide explains how to review the current connection environment, browser, device, and server-observed information in order.
View guide
FAQ
Questions about usage
Short answers for the points that are easy to miss on first use.
Which page should I start with?
Start from the home page or the tool list to find a tool close to what you need. If you already know the category, the category list is also a clear starting point.
Where can I check the guide for each tool?
Each tool is intended to have its own how-to page with steps and screenshots. Open the tool page first, then move to the related how-to page when you need detailed guidance.
What should I do if it does not work well?
Check the input format and the guidance shown on the screen first. If it still does not work, trying another format or browser may help.