PDF Toolbox Frequently Asked Questions

Basic Functions

What is PDF Toolbox?

PDF Toolbox is a powerful PDF processing tool that helps you easily handle various PDF file needs on your mobile device. We provide professional-grade PDF editing functions, including PDF to image conversion, image to PDF conversion, watermark addition, password protection, and password removal.

What main features does PDF Toolbox support?

PDF Toolbox currently supports the following core features:

• PDF to Image: Convert PDF files to various image formats
• Image to PDF: Convert single or multiple images to PDF files
• Add Watermark: Add custom text watermarks to PDF files
• Add Password: Add password protection to PDF files
• Remove Password: Remove password protection from PDF files

PDF to Image Function

How do I convert a PDF to images?

1. Select the “PDF to Image” function from the main interface
2. Click the “Select” button to choose the PDF file you want to convert
3. Select your desired image format (JPG, PNG or GIF)
4. Choose the result type (multiple images or a single large image)
5. Select the color type (color, grayscale, or black & white)
6. Choose the output quality (low, medium, or high)
7. Click the “Convert” button to start processing
8. After conversion is complete, you can preview and export the images in the results page

What image formats are supported for PDF to Image conversion?

We support the following common image formats:

• JPG: The most commonly used image format, suitable for photos and complex images
• PNG: Supports transparent backgrounds, ideal for charts and text images
• GIF: Supports simple animation effects

How can I adjust the output image quality?

In the conversion settings, you can choose from three quality levels:

• Low: Smaller file size, but some image details may be lost
• Medium: Balanced quality and file size, suitable for most purposes (default option)
• High: Highest quality output, but larger file size

What’s the difference between multiple images and a single large image?

• Multiple Images: Each page of the PDF will be converted to a separate image file, suitable for multi-page PDF documents
• Single Large Image: The entire PDF will be merged into one large image, ideal for maintaining overall visual effects

Image to PDF Function

How do I convert images to PDF?

1. Select the “Image to PDF” function from the main interface
2. Click the “Select” button to choose images from files or photo library
3. You can select multiple images for conversion
4. Choose the multiple file processing logic (merge into a single PDF or convert to separate PDFs)
5. Select the color type (color, grayscale, or black & white)
6. Click the “Convert” button to start processing
7. After conversion is complete, you can preview and export the PDF file(s) in the results page

Can I convert multiple images at once?

Yes, you can select multiple images simultaneously for conversion, and you have two processing options:

• Merge into a single PDF: All images will be merged into one PDF file in sequence, each image as a page
• Convert to separate PDFs: Each image will generate an independent PDF file

What image sources are supported?

You can select images from two sources:

• Select from File: Access your device’s file system to choose images
• Select from Photo: Choose images directly from your photo library

What color processing options are available?

We provide three color processing options:

• Color: Preserves all color information from the original images
• Grayscale: Converts images to grayscale, suitable for documents and black and white photos
• Black & White: Retains only black and white colors, ideal for text documents and simple charts

Add Watermark Function

How do I add a watermark to a PDF?

1. Select the “Add Watermark” function from the main interface
2. Click the “Select” button to choose the PDF file you want to watermark
3. Enter your desired watermark text in the watermark text field
4. Set the watermark’s font size, transparency, rotation angle, horizontal spacing, and vertical spacing
5. Click the “Add Watermark” button to start processing
6. After processing is complete, you can preview and export the watermarked PDF in the results page

Can I customize the watermark style?

Yes, PDF Toolbox provides multiple watermark customization options:

• Watermark Text: You can enter any text content you want
• Font Size: Adjust the size of the watermark text
• Transparency: Set the transparency level of the watermark (0-100)
• Rotation Angle: Set the rotation angle of the watermark (0-360 degrees)
• Horizontal Spacing: Adjust the horizontal arrangement density of watermarks
• Vertical Spacing: Adjust the vertical arrangement density of watermarks

Will the watermark be applied to every page of the PDF?

Yes, the watermark will be applied to every page of the PDF document. Our application processes all pages in the document, ensuring the watermark appears consistently throughout the entire document.

Add Password Function

How do I add password protection to a PDF?

1. Select the “Add Password” function from the main interface
2. Click the “Select” button to choose the PDF file you want to encrypt
3. Enter your desired password in the password input field
4. Click the “Add Password” button to start processing
5. After processing is complete, you can preview and export the password-protected PDF in the results page

Can I add a new password to a PDF that already has a password?

No. For security reasons, our application does not support adding a new password to PDF files that are already password-protected. You need to remove the existing password first, then add a new password.

What if I forget the password I set?

Please be sure to remember the password you set, as PDF passwords are securely encrypted, and if you forget your password, you will not be able to recover the file contents. We recommend using a password manager or storing your password in a secure location.

Remove Password Function

How do I remove password protection from a PDF?

1. Select the “Remove Password” function from the main interface
2. Click the “Select” button to choose the password-protected PDF file
3. Enter the current password of the file in the password input field
4. Click the “Remove Password” button to start processing
5. After processing is complete, you can preview and export the PDF without password protection in the results page

Can I remove a PDF’s password protection without knowing the password?

No. Removing a PDF password requires knowing the original password. Our application does not support cracking PDF passwords, which is to protect the rights of document creators and document security.

What happens if I enter an incorrect password?

If you enter an incorrect password, the application will display an “Incorrect Password” error message, and you will need to enter the correct password to continue the operation.

File Processing and Export

Where are the converted files stored?

Converted files are temporarily stored within the application. After completing the conversion, you can export the files to other locations on your device or share them with other applications through the results page.

How do I export converted files?

On the results page, you can:

1. Click the “Export” button
2. Choose “Save to Photos” (for image files) or “Save to File”
3. Select the save location according to system prompts

Does the app support batch processing of files?

Currently, our application supports converting multiple images to PDF (merged or separate), but other functions require processing each file individually. We are considering adding batch processing functionality in future versions.

Is there a file size limit?

Although our application can process PDF files of most common sizes, processing extremely large files may cause performance degradation or insufficient device memory. For very large files, we recommend using professional PDF software on a desktop computer.

Subscription and Membership

Is PDF Toolbox free to use?

PDF Toolbox provides basic features for free, but some advanced features may require a membership subscription. We offer weekly, yearly, and lifetime membership options.

What privileges do members enjoy?

Members can enjoy the following privileges:

• Unlock all premium features
• No file quantity and size limitations
• No ad interruptions
• Priority access to new features and updates

How do I restore my purchased membership?

If you have previously purchased a membership but cannot access it now, you can:

1. Click “Subscription” in the settings page
2. Click the “Restore Purchase” button
3. The system will automatically check your purchase records and restore your membership

Can I cancel my subscription?

Yes, you can cancel your subscription at any time. After cancellation, you can still enjoy member privileges until the end of your current subscription period. To cancel your subscription:

1. Go to your device’s app store
2. Enter account settings
3. Find the “Subscriptions” option
4. Select PDF Toolbox and cancel the subscription

Technical Support

What should I do if I encounter problems?

If you encounter any issues during use, please try the following steps:

1. Check if your application is the latest version
2. Restart the application or device
3. Check the FAQ in the settings page
4. Send a problem description using the “Contact Us” feature

How do I provide feedback or feature suggestions?

We highly value user feedback and suggestions. You can contact us through:

1. Click “Contact Us” in the settings page of the application
2. Send an email to our support email address
3. Rate us and leave a review in the App Store

What new features will be added in the future?

We plan to continuously improve PDF Toolbox’s functionality, and future additions may include:

• PDF Merge and Split
• PDF Page Editing (Add, Delete, Rearrange)
• OCR Text Recognition
• PDF Form Filling
• More PDF Annotation Tools

Stay tuned for more features!