About Qudo
Welcome to Qudo Tools.
Qudo is a collection of free, privacy-focused online tools for PDF, image, text, and document processing. We help users handle files, data, and everyday tasks efficiently through clear, easy-to-use web tools — no software installation or account registration required.
https://www.qudo.cc
Who We Are
Qudo Tools is developed and maintained by Jee Xue, an independent developer based in China. This is a personally operated website, not an automated template or abandoned project. The site is actively maintained, regularly updated with new tools and improvements, and monitored for issues. If you encounter problems or have suggestions, you can reach the operator directly through the contact information below.
What We Provide
Privacy & Security
Tools to help users protect sensitive information and clean document metadata, such as:
- Document privacy checker
- Office privacy cleaner
- PDF redaction
- Screenshot redaction
PDF Tools
Comprehensive PDF processing tools for merging, splitting, converting, and editing, such as:
- Merge and split PDF
- Compress PDF
- PDF to Word/Excel/Image
- Image to PDF
- Rotate, crop, and organize PDF pages
- Add watermarks and page numbers
- Fill, sign, and annotate PDF
- Protect and unlock PDF
- Extract text and images from PDF
Image Tools
Image processing tools for conversion, compression, editing, and format support, such as:
- Image format converter (including HEIC to JPG)
- Image compressor and resizer
- Crop and rotate images
- Add image watermarks
- EXIF viewer and remover
- ID photo maker
- Remove portrait background
- Social media image resizer
Text Tools
Tools for counting, organizing, and transforming text content, such as:
- Word and character count
- Case conversion
- Duplicate line removal
- Space cleaner
- Reading time calculator
- Text diff comparison
- Sensitive data masker
- Markdown editor
Developer Tools
Utilities for developers, webmasters, and digital marketers, such as:
- JSON formatter
- URL encoder/decoder
- Timestamp converter
- UTM link generator
- AES encryption/decryption
- MD5 hash calculator
- QR code generator
- Barcode generator
Calculator Tools
Everyday calculation and conversion tools, such as:
- Percentage calculator
- Unit converter
- Age calculator
- Date difference calculator
- Date add/subtract
- Business days calculator
- Margin and markup calculator
- Loan calculator
Why We Created Qudo
- Too many ads on pages, interfering with normal use
- Complex operation steps
- Unclear function descriptions
- Cannot be used conveniently on mobile phones
- Not clear about how user data is processed
- Can only complete single operations, lacking practical examples
Therefore, we created Qudo, hoping to make online tools more: simple, fast, clear, practical, and privacy-respecting. Our goal is not to simply increase the number of tools, but to make every tool truly solve a specific problem.
Simple and Easy to Use · Clear and Transparent · Local Processing First · Multi-device Support · Continuous Improvement
Simple and Easy to Use
Users do not need to register an account. After opening the tool page, you can directly use the main functions.
Clear and Transparent
Each tool page will try to explain: what the tool can do, how to use it, practical processing examples, calculation or conversion rules, applicable scenarios, function limitations, data and privacy handling, and frequently asked questions.
Local Processing First
When technical conditions permit, Qudo prefers to use browser-local processing. For example, text statistics, format conversion and some image information reading can be completed directly in the user's device without submitting input content to this site's servers. Different tools may have different processing methods, please refer to the instructions on specific tool pages. For more information on information processing, please read our privacy policy.
Multi-device Support
We strive to make tools work properly on desktop computers, laptops, tablets and mobile phones.
Continuous Improvement
We will update tool functions and description content based on actual usage, user feedback, browser changes and technical standards.
Data and Privacy
We value the privacy of user input content. Unless otherwise specified on specific tool pages, most tools will process data directly in the browser. Qudo will not actively save text, images or calculation content entered by users in local tools.
Please do not enter passwords, API keys, bank card information, ID card numbers, trade secrets or other highly sensitive data in any online tool.
Privacy Policy →Third-Party Models and Code
Most Qudo tools run entirely in your browser using standard web technologies. However, some specialized tools load third-party libraries or machine learning models to provide advanced functionality. These resources are loaded from trusted sources and execute locally on your device. Here are the tools that use third-party resources:
Remove Portrait Background
Loads ONNX machine learning model (onnxruntime-web) for AI-powered background removal. The model runs entirely in your browser.
PDF Tools (Merge, Split, Compress, etc.)
Uses pdf-lib and pdfjs-dist libraries for PDF processing. All operations happen locally.
Image Tools (HEIC to JPG, EXIF Viewer, etc.)
Uses heic2any and exifreader libraries for image format conversion and metadata extraction.
OCR and Text Recognition
Uses Tesseract.js for optical character recognition. The OCR engine runs locally in your browser.
QR Code and Barcode
Uses qrcode and @zxing/library for code generation and scanning.
Content and Calculation Accuracy
We will do our best to ensure that tool functions, calculation formulas and description content are accurate and reliable, but we cannot guarantee that all results are completely error-free in any situation.
- Legal advice
- Medical advice
- Financial or investment advice
- Accounting or tax opinions
- Professional engineering conclusions
- Other opinions requiring judgment by licensed professionals
For important decisions, please verify with authoritative sources or consult qualified professionals. If you find calculation errors, translation issues, function anomalies or inaccurate content, please contact us.
Advertising Notice
To support website server, domain, development and maintenance costs, Qudo may display ads through third-party advertising services such as Google AdSense. Ad content is provided by third-party advertising service providers. Unless explicitly stated, Qudo does not represent, guarantee or recommend the products and services promoted in ads.
Ads will not change the calculation rules of tools. We will not ask users to click ads to support the website. For information on advertising cookies and data processing, please see our privacy policy.
External Links
Some pages may contain links to third-party websites, documents or services. These links are usually provided to offer reference materials or help users further understand related content. Third-party websites are responsible by their respective operators, and Qudo cannot control their content, availability and privacy measures. Before visiting third-party websites, please check their terms of use and privacy policy yourself.
Content and Tool Updates
Qudo Tools is actively maintained and regularly updated. New tools are added based on user needs and feedback, existing tools are improved for better performance and usability, and translations are refined for accuracy. The site is monitored for technical issues, and updates are deployed as needed. If you notice outdated content or broken functionality, please contact us so we can address it promptly.
Contact Us
If you have the following needs, please feel free to contact us: report tool errors, suggest features, report translation issues, report broken links, report privacy or security issues, suggest content corrections, or make other reasonable inquiries.
Website Name: Qudo Tools Website Address: https://www.qudo.cc Operator: Jee Xue Contact Email: [email protected] Country or Region: China
About This Page
This page will change as Qudo's functions, operations and service scope evolve. Important updates will be announced on this page.
Last Updated: October 17, 2026