Welcome to our comprehensive guide on how to edit PDF files. PDF (Portable Document Format) has become a standard for sharing and distributing documents across different platforms. Whether you’re a student, professional, or simply someone who frequently works with electronic documents, knowing how to edit PDF files is an essential skill that can save you time and effort.
PDF files are widely used in various fields and industries due to their consistent formatting and compatibility across different devices and operating systems. Editing PDF files allows you to modify the content, structure, and design of your documents, enabling you to make necessary changes, corrections, or customizations as required.
Having the ability to edit PDF files provides several advantages. It allows you to update information, fix errors, or improve the visual presentation of your documents. Whether you need to edit reports, contracts, presentations, or other types of documents, mastering PDF editing can significantly enhance your productivity and professionalism.
In this guide, we will explore the step-by-step process of editing PDF files, covering various techniques, tools, and best practices. From selecting the right editing software or tool to making specific edits, we’ll guide you through the entire editing journey. By the end of this guide, you’ll have the knowledge and skills to confidently edit PDF files and unlock their full potential.
How to Edit PDF: Step-by-Step Instructions
Editing PDF files is a task that can be accomplished with the right tools and techniques. Follow these step-by-step instructions to learn how to edit PDF files effectively:
Step 1: Select a Reliable PDF Editing Software or Tool
To begin, choose a reliable PDF editing software or tool that suits your needs. There are various options available, ranging from comprehensive desktop software to online editing tools. Some popular choices include Adobe Acrobat Pro, Foxit PhantomPDF, Nitro Pro, or online platforms like Smallpdf and PDFescape.
Step 2: Open the PDF File for Editing
Once you have selected your preferred PDF editing software or tool, open the PDF file you want to edit. Most editing tools provide a straightforward way to open PDF files, either through a dedicated “Open” option or by dragging and dropping the file into the software interface.
Step 3: Familiarize Yourself with the Editing Tools
Take some time to familiarize yourself with the editing tools available in your chosen software or tool. These tools may include options for editing text, images, pages, adding annotations, and more. Understanding the functions and capabilities of each tool will enable you to make precise edits to your PDF file.
Step 4: Edit Text and Images in the PDF
To edit text within the PDF, locate the text editing tool and select the text you want to modify. You can then make changes to the font, size, color, or formatting. Similarly, to edit images, use the image editing tool to resize, crop, or replace images within the document.
Step 5: Rearrange or Delete Pages (If Needed)
If you need to rearrange the order of pages or delete specific pages from the PDF, look for options related to page management. Most PDF editing software or tools allow you to drag and drop pages to rearrange them or use specific commands to delete unwanted pages.
Step 6: Add Annotations and Markup
Annotations and markup can be useful for adding comments, highlighting important sections, or drawing attention to specific elements within the PDF. Look for annotation tools such as text boxes, sticky notes, highlighters, or drawing tools to add these elements to your document.
Step 7: Review and Save Your Changes
After making the desired edits, take a moment to review your changes and ensure everything is as intended. Check for any errors or inconsistencies and make necessary adjustments. Once you are satisfied, save your changes using the “Save” or “Save As” option provided in the software or tool.
Top PDF Editing Software for Effortless Modifications
When it comes to editing PDF files, having the right software can make a significant difference in your workflow and the quality of your edits. Here, we will explore some of the top PDF editing software options available, known for their ease of use and comprehensive editing capabilities. These software tools are trusted by professionals and individuals alike, providing a range of features to make your PDF editing experience effortless.
- Adobe Acrobat Pro DC:
Adobe Acrobat Pro DC is a widely recognized and industry-leading PDF editing software. It offers a comprehensive set of tools for editing text, images, and pages. With features like OCR (Optical Character Recognition), form creation, and digital signature support, Adobe Acrobat Pro DC is a go-to choice for professionals who require advanced PDF editing capabilities. - Nitro Pro:
Nitro Pro is another powerful PDF editing software that provides a user-friendly interface and extensive editing features. It allows you to edit text, images, and pages with ease. Nitro Pro also offers collaboration tools, document conversion options, and advanced security features. It is a popular choice for both individuals and businesses looking for efficient PDF editing solutions. - Foxit PhantomPDF:
Foxit PhantomPDF is known for its robust editing capabilities and intuitive interface. It offers a range of features such as text and image editing, form creation, document collaboration, and more. Foxit PhantomPDF also provides various customization options to enhance the appearance and accessibility of your edited PDF files. - PDFelement:
PDFelement is a versatile PDF editing software that offers a wide range of editing tools and features. It allows you to edit text, images, and pages effortlessly. PDFelement also provides advanced features like form creation, OCR, and document conversion. With its user-friendly interface and comprehensive set of editing options, PDFelement is a reliable choice for both beginners and experienced users. - Sejda PDF Editor:
Sejda PDF Editor is a browser-based PDF editing tool that offers a user-friendly interface and a range of editing features. It allows you to edit text, images, and pages, as well as add annotations and fill out forms. Sejda PDF Editor provides a seamless editing experience without the need for downloading or installing software.
These are just a few examples of the top PDF editing software options available. Depending on your specific needs and preferences, you can explore these software tools to find the one that best suits your requirements. Whether you’re editing PDF files for personal or professional purposes, these software options provide the necessary tools for effortless modifications.
Online Tools for Editing PDF Documents
In addition to dedicated software, there are several reliable online tools available that allow you to edit PDF documents conveniently without the need to download or install any software. These online tools offer a range of editing features and are accessible from any web browser. Here, we will explore some of the top online tools for editing PDF documents:
- Smallpdf:
Smallpdf is a popular online platform that offers a variety of PDF tools, including PDF editing capabilities. It allows you to edit text, images, and pages in your PDF files. With Smallpdf, you can make changes, add annotations, and customize the content of your PDF documents easily. The platform is user-friendly and provides a seamless editing experience. - PDFescape:
PDFescape is another reliable online tool for editing PDF documents. It offers both free and paid versions with different levels of functionality. With PDFescape, you can edit text, images, and pages, as well as add annotations and fill out forms. The platform is intuitive and provides a range of editing features to meet your needs. - Sejda PDF Editor:
Sejda PDF Editor is a comprehensive browser-based PDF editing tool that offers a user-friendly interface and a wide range of editing features. With Sejda PDF Editor, you can edit text, images, and pages effortlessly. The tool also allows you to add annotations, highlight text, and fill out forms. It provides a seamless editing experience directly in your web browser. - DocHub:
DocHub is an online PDF editor that simplifies the process of editing PDF documents. It allows you to edit text, images, and pages, as well as add annotations and signatures. DocHub offers a collaborative environment, making it easy to share and collaborate on edited PDF files with others. The platform integrates with popular cloud storage services, further enhancing its usability. - PDF Buddy:
PDF Buddy is a user-friendly online PDF editor that offers basic editing features. With PDF Buddy, you can edit text, images, and pages in your PDF documents. It also provides annotation tools to add comments and highlights. The platform is straightforward to use and suitable for simple PDF editing tasks.
These online tools provide convenient and accessible options for editing PDF documents directly in your web browser. They offer a range of editing features and can be a great choice when you need to make quick edits or don’t have access to dedicated PDF editing software. Remember to review the features and limitations of each online tool to ensure it meets your specific requirements.
Editing Text and Images in PDF Files
One of the key aspects of PDF editing is the ability to make changes to text and images within the document. Whether you need to correct a typo, update information, or modify an image, editing text and images in PDF files can be done with the right tools. Here, we will explore the process of editing text and images in PDF files:
Editing Text in PDF Files
- Select the Text Editing Tool:
Open your PDF editing software or tool and locate the text editing tool. It is typically represented by an icon that resembles a cursor or a text box. - Select the Text to Edit:
Click on the text you want to edit within the PDF file. The selected text will usually be highlighted or surrounded by a bounding box. - Make Text Edits:
Once the text is selected, you can make the necessary changes. You can delete, add, or modify the text by typing new text or using the backspace/delete key to remove existing text. Adjust the font, size, color, or formatting as needed using the available formatting options. - Save Your Changes:
After editing the text, save your changes by selecting the “Save” or “Save As” option in your PDF editing software or tool.
Editing Images in PDF Files
- Select the Image Editing Tool:
In your PDF editing software or tool, look for the image editing tool, which is often represented by an icon that resembles an image or picture. - Select the Image to Edit:
Click on the image you want to edit within the PDF file. The selected image may have handles or an outline indicating that it is selected. - Make Image Edits:
Once the image is selected, you can perform various edits. Resize the image by dragging its handles or specifying the dimensions. Crop the image to remove unwanted portions. Replace the image by deleting the current image and inserting a new one. - Save Your Changes:
After editing the image, save your changes by selecting the “Save” or “Save As” option in your PDF editing software or tool.
Remember to review your changes and ensure everything appears as intended before saving the edited PDF file. It’s also a good practice to save the edited file with a new name to preserve the original document.
Adding and Deleting Pages in PDF Documents
The ability to add or delete pages in a PDF document allows you to customize the structure and content of your files. Whether you want to insert additional information or remove unnecessary pages, the process is straightforward with the right PDF editing software or tool. Here’s how you can add and delete pages in PDF documents:
Adding Pages to a PDF Document
- Open the PDF Editing Software or Tool:
Launch your preferred PDF editing software or tool and open the PDF document you want to add pages to. - Locate the Page Management Tools:
Look for the page management or manipulation tools within the software or tool. These tools are designed to handle tasks related to adding, rearranging, or deleting pages. - Choose the Insert or Add Page Option:
Select the option to insert or add a new page to the PDF document. This option is typically represented by a button or command that allows you to add a blank page or import pages from other PDF files. - Specify the Position of the New Page:
When prompted, specify where you want to insert the new page within the document. You can choose to insert it before or after a specific page, or at the beginning or end of the document. - Customize the New Page (if applicable):
Depending on the PDF editing software or tool you are using, you may have the option to customize the new page. This can include setting the page size, orientation, background color, or other attributes. - Save the Changes:
Once you have added the new page, save the changes to the PDF document by selecting the “Save” or “Save As” option in your PDF editing software or tool.
Deleting Pages from a PDF Document
- Open the PDF Editing Software or Tool:
Launch your preferred PDF editing software or tool and open the PDF document from which you want to delete pages. - Locate the Page Management Tools:
Look for the page management or manipulation tools within the software or tool. - Select the Pages to Delete:
Use the page selection tool or command to choose the pages you want to delete. You can usually select multiple pages at once by holding down the Ctrl or Shift key while clicking on the pages. - Choose the Delete or Remove Page Option:
Select the option to delete or remove the selected pages from the PDF document. This option is typically represented by a button or command that allows you to remove the selected pages. - Confirm the Deletion:
Depending on the software or tool, you may be prompted to confirm the deletion of the selected pages. Ensure that you have selected the correct pages before proceeding. - Save the Changes:
Once you have deleted the pages, save the changes to the PDF document by selecting the “Save” or “Save As” option in your PDF editing software or tool.
Modifying Links and Annotations in PDFs
PDF documents often contain links and annotations that provide additional information, interactivity, and collaboration capabilities. Being able to modify these links and annotations allows you to update, enhance, or refine the content of your PDF files. Here’s how you can modify links and annotations in PDFs:
Modifying Links in PDFs
- Open the PDF Editing Software or Tool:
Launch your preferred PDF editing software or tool and open the PDF document that contains the links you want to modify. - Locate the Link Editing Tools:
Look for the link editing tools within the software or tool. These tools are designed to handle tasks related to modifying and managing links within the PDF document. - Select the Link to Modify:
Use the link selection tool or command to select the specific link you want to modify. This can be a hyperlink, an internal link, or a link associated with an image or object. - Edit the Link Properties:
Once the link is selected, access the link properties or editing options. These options may allow you to modify the destination URL, adjust the link appearance, change the link behavior (e.g., open in a new window), or add additional attributes. - Preview and Test the Modified Link:
After making the desired changes, preview the modified link within the PDF document to ensure it functions as intended. Test the link by clicking on it to verify that it leads to the correct destination. - Save the Changes:
Once you are satisfied with the modified link, save the changes to the PDF document by selecting the “Save” or “Save As” option in your PDF editing software or tool.
Modifying Annotations in PDFs
- Open the PDF Editing Software or Tool:
Launch your preferred PDF editing software or tool and open the PDF document that contains the annotations you want to modify. - Locate the Annotation Editing Tools:
Look for the annotation editing tools within the software or tool. These tools are specifically designed for modifying and managing annotations in the PDF document. - Select the Annotation to Modify:
Use the annotation selection tool or command to choose the specific annotation you want to modify. Annotations can include text boxes, sticky notes, highlights, drawings, and more. - Edit the Annotation Properties:
Once the annotation is selected, access the annotation properties or editing options. These options may allow you to modify the text content, adjust the appearance (e.g., font, color, size), move or resize the annotation, or add additional attributes. - Preview and Verify the Modified Annotation:
After making the desired changes, preview the modified annotation within the PDF document to ensure it appears as intended. Verify that the modified annotation conveys the intended information or feedback. - Save the Changes:
Once you are satisfied with the modified annotation, save the changes to the PDF document by selecting the “Save” or “Save As” option in your PDF editing software or tool.
Securing and Encrypting PDFs after Editing
After editing a PDF document, it is important to consider its security and protect the content from unauthorized access or modifications. Securing and encrypting PDFs adds an extra layer of protection, ensuring that only authorized individuals can view and make changes to the document. Here are the steps to secure and encrypt PDFs after editing:
1. Open the PDF Editing Software or Tool:
Launch your chosen PDF editing software or tool and open the edited PDF document you want to secure and encrypt.
2. Access the Security or Encryption Settings:
Locate the security or encryption settings within the software or tool. These settings are typically found in the “File” or “Document” menu, often referred to as “Security Options” or “Document Security.”
3. Choose the Encryption Method:
Select the encryption method you want to use to secure the PDF document. Common encryption methods include password-based encryption and certificate-based encryption.
4. Set a Strong Password (if applicable):
If you opt for password-based encryption, set a strong and unique password for the PDF document. Make sure to choose a password that is not easily guessable and consider using a combination of uppercase and lowercase letters, numbers, and special characters.
5. Select Security Options:
Choose the specific security options you want to enable for the PDF document. These options may include restricting printing, copying, editing, or extracting content from the document. You can customize these options based on your specific security requirements.
6. Specify Permissions and Restrictions:
Specify the permissions and restrictions for users who have access to the PDF document. For example, you can set it to allow only authorized individuals to make changes, fill out forms, or add comments. You can also specify whether digital signatures are required for any modifications.
7. Save the Secured and Encrypted PDF Document:
Once you have set the security and encryption options, save the changes to the PDF document by selecting the “Save” or “Save As” option in your PDF editing software or tool. The document is now secured and encrypted.
8. Test the Security and Encryption:
To ensure that the security and encryption settings are properly implemented, test the document by opening it with a PDF viewer. Verify that the document prompts for a password (if applicable) and that the specified restrictions are in place.
Converting PDFs to Different Formats for Editing
Converting PDFs to different formats can be helpful when you need to further edit the content or work with specific software applications that do not natively support PDF editing. Converting PDFs to editable formats such as Word, Excel, or plain text allows you to manipulate the content more freely. Here’s how you can convert PDFs to different formats for editing:
1. Choose a PDF Conversion Tool:
Select a reliable PDF conversion tool that supports the conversion of PDF files to the desired editable format. There are several options available online and offline, including Adobe Acrobat, online conversion websites, or dedicated PDF conversion software.
2. Open the PDF Conversion Tool:
Launch the PDF conversion tool you have chosen.
3. Import the PDF File:
Import the PDF file you want to convert into the conversion tool. This can typically be done by selecting the “Open” or “Import” option within the tool’s interface. Locate the PDF file on your computer or choose the file from cloud storage services like Google Drive or Dropbox.
4. Choose the Desired Output Format:
Select the desired output format for conversion. Depending on the conversion tool, you may have options such as Word (DOCX), Excel (XLSX), plain text (TXT), or other compatible formats. Choose the format that best suits your editing needs.
5. Configure Conversion Settings (if applicable):
Some PDF conversion tools provide additional configuration options for the conversion process. For example, you may have the option to select specific pages to convert, adjust the layout or formatting, or enable OCR (Optical Character Recognition) for scanned PDFs. Configure these settings according to your requirements.
6. Initiate the Conversion Process:
Start the conversion process by clicking the “Convert” or “Start” button within the conversion tool. The tool will process the PDF file and convert it into the selected editable format.
7. Save the Converted File:
Once the conversion is complete, save the converted file to your desired location on your computer or cloud storage. Consider using a new filename to differentiate it from the original PDF file.
8. Open the Converted File for Editing:
Open the converted file using the appropriate software application that supports the chosen editable format. For example, if you converted the PDF to a Word document, open it using Microsoft Word or a compatible word processing software.
9. Perform the Desired Edits:
With the converted file open in the editing software, you can now make the necessary edits to the content. Modify text, images, tables, or any other elements based on your requirements. Take advantage of the editing tools provided by the software to achieve the desired changes.
10. Save the Edited File:
Save the edited file after making the necessary changes. This ensures that your modifications are preserved.
Collaboration and Reviewing Tools for PDF Editing
Collaboration and reviewing tools play a crucial role when multiple individuals need to work on a PDF document, provide feedback, and make edits collaboratively. These tools facilitate effective communication, streamline the review process, and ensure efficient collaboration among team members. Here are some collaboration and reviewing tools specifically designed for PDF editing:
- Adobe Acrobat Pro DC:
Adobe Acrobat Pro DC offers robust collaboration features that enable seamless sharing and reviewing of PDF documents. It allows multiple users to comment, track changes, and annotate PDFs in real-time. Users can add sticky notes, highlight text, draw shapes, and use other annotation tools to provide feedback. The commenting and review features in Adobe Acrobat Pro DC make it a popular choice for collaborative PDF editing. - Google Drive:
Google Drive offers built-in collaboration features for PDF files. By uploading a PDF document to Google Drive, you can share it with specific users or make it accessible to a team. Collaborators can view, comment, and suggest edits directly within Google Drive. The real-time collaboration capabilities of Google Drive make it convenient for teams working on PDF documents simultaneously. - Microsoft SharePoint:
Microsoft SharePoint is a powerful platform that allows teams to collaborate on various types of documents, including PDFs. SharePoint provides features like document check-in/check-out, version control, and the ability to add comments and annotations. It enables team members to work on PDF files together, ensuring efficient collaboration and document management. - Box:
Box is a cloud storage and collaboration platform that offers features for reviewing and editing PDF documents. With Box, you can share PDF files with team members, assign tasks, and track changes. Collaborators can add comments, annotations, and highlights to provide feedback. Box simplifies the review process and keeps everyone in the loop during collaborative PDF editing. - Markup:
Markup is an online platform specifically designed for collaborative PDF editing. It allows users to upload PDF documents, invite collaborators, and work together on the same document in real-time. Markup provides a range of annotation tools, such as commenting, highlighting, drawing, and stamping, making it easy to provide feedback and make edits collaboratively.
These collaboration and reviewing tools offer features that streamline the process of editing PDF documents in a team environment. They enhance communication, facilitate feedback, and enable efficient collaboration among team members, ensuring that the PDF editing process is smooth and effective.
Troubleshooting Common Issues while Editing PDFs
While editing PDFs, you may encounter certain issues that can hinder your progress or affect the desired outcome. Understanding common issues and knowing how to troubleshoot them can help you overcome these challenges effectively. Here are some common issues you may encounter while editing PDFs, along with troubleshooting tips:
- Incompatibility with Editing Software:
Sometimes, a PDF may not open or display properly in your chosen editing software. Ensure that you are using the latest version of the software and that it supports the PDF format. Try opening the PDF in alternative editing software or convert it to a different format for editing. - Security Restrictions:
If you are unable to edit certain elements of a PDF, such as text or images, it may have security restrictions in place. Check the document properties or security settings to see if editing has been restricted. If you have the necessary permissions, remove the restrictions or acquire the necessary password or credentials to make the desired edits. - Font or Formatting Issues:
When editing PDFs, font or formatting issues can arise, such as missing or incorrect fonts, text alignment problems, or distorted formatting. Ensure that you have the required fonts installed on your system or choose alternative fonts that closely match the original. Adjust text alignment and formatting manually to correct any inconsistencies. - Locked or Read-Only PDFs:
If a PDF is locked or set to read-only, you may not be able to make any edits directly. Request the necessary permissions from the document owner or contact the appropriate authority to acquire the required access privileges. Alternatively, create a duplicate of the PDF and edit the copy instead. - Corrupted or Damaged PDFs:
If a PDF is corrupted or damaged, it may exhibit unexpected behavior or prevent editing altogether. Try opening the PDF in alternative software or use a PDF repair tool to fix any corruption issues. If possible, obtain a non-corrupted version of the PDF from the original source. - Limited Editing Capabilities:
Some PDF editing tools may have limitations on the types of edits you can perform. Ensure that you are using a feature-rich PDF editing software or tool that supports the specific edits you need to make. Consider exploring alternative software or tools that offer more comprehensive editing capabilities. - Performance or Stability Issues:
If the PDF editing software or tool is running slowly or crashing frequently, ensure that your system meets the minimum requirements for the software. Close unnecessary applications or processes running in the background to free up system resources. If the issue persists, contact the software provider for technical support or consider using an alternative software or tool. - Loss of Data or Original Formatting:
While editing a PDF, it’s important to save your progress regularly and make backups to avoid losing any data. Maintain a copy of the original PDF file in case you need to revert to it. Pay attention to any warnings or notifications that the editing software or tool provides to ensure that the original formatting and content are preserved.
By troubleshooting these common issues, you can overcome obstacles and continue with your PDF editing tasks more effectively. Remember to save your progress frequently and maintain a backup of the original PDF file whenever possible.
Conclusion
In conclusion, the ability to edit PDF files is a valuable skill that empowers you to modify, customize, and enhance your documents according to your specific needs. Throughout this guide, we have explored various aspects of PDF editing, including software options, online tools, and techniques for editing text, images, adding/deleting pages, modifying links and annotations, securing and encrypting PDFs, converting to different formats, and collaborating with others.
By following the step-by-step instructions, you can confidently navigate the PDF editing process and achieve your desired results. Remember to choose the right software or online tool based on your requirements, consider security and encryption measures to protect your PDFs, and make use of collaboration and reviewing tools for effective teamwork.
While editing PDFs, it’s essential to troubleshoot common issues that may arise, such as incompatibility, security restrictions, font or formatting issues, locked or read-only PDFs, corruption, limited editing capabilities, performance problems, or data loss. By being aware of these issues and utilizing troubleshooting techniques, you can overcome challenges and continue with your editing tasks smoothly.
Frequently Asked Questions
Q:
How can I edit a PDF for free?
A:
There are several free options available for editing PDF files. You can use online tools like Smallpdf, PDFescape, or Sejda PDF Editor, which offer basic editing features at no cost. Additionally, some PDF viewers like Adobe Acrobat Reader DC provide limited editing capabilities for free.
Q:
How can I edit a PDF file?
A:
To edit a PDF file, you can use dedicated PDF editing software or online tools. These tools typically allow you to modify text, images, add or delete pages, and annotate the PDF. Open the PDF in the chosen software or tool, select the editing feature you want to use, and make the desired changes. Finally, save the edited PDF file.
Q:
How do I edit a PDF without Adobe?
A:
If you don’t have Adobe Acrobat or Adobe Acrobat Pro, you can still edit PDF files using alternative software or online tools. Some popular free options include Smallpdf, PDFescape, Sejda PDF Editor, or using the built-in editing features of certain PDF viewers like Foxit Reader or Microsoft Edge.
Q:
How do I edit a PDF that is 100% free?
A:
You can edit a PDF for free using online tools such as Smallpdf, PDFescape, or Sejda PDF Editor. These tools offer free access to basic editing features like modifying text, images, and pages. However, keep in mind that some advanced or premium features may require a paid subscription.
Q:
Why can’t I edit a PDF for free?
A:
There can be several reasons why you may not be able to edit a PDF for free. It could be due to restrictions set by the document creator, security settings that prevent editing, or limitations in the chosen PDF editing tool. Ensure that you have the necessary permissions and consider using alternative free editing tools or software.
Q:
Is Microsoft PDF editor free?
A:
Microsoft provides a built-in PDF editing feature in its Office applications like Microsoft Word, Excel, and PowerPoint. While some basic editing functions are available for free, more advanced editing features may require a Microsoft 365 subscription.
Q:
Can PDF files be edited?
A:
Yes, PDF files can be edited using dedicated PDF editing software or online tools. With these tools, you can modify text, images, add or delete pages, annotate, and perform various editing tasks on PDF documents.
Q:
How do I edit a PDF in Google Drive?
A:
Google Drive provides limited PDF editing capabilities. To edit a PDF in Google Drive, upload the PDF file to your Google Drive account. Right-click on the PDF file, select “Open with,” and choose Google Docs. The PDF file will be converted into a Google Docs document, allowing you to edit the text and make changes.