How to batch modify PDF metadata: set author, title, subject, and keywords at once

Many PDF files require unified document properties such as author, title, subject, and keywords before archiving, distribution, or uploading to a system. If you open and modify them one by one with a PDF reader, it is not only time-consuming but also prone to omissions. This article uses HeSoft Doc Batch Tool as an example to explain how to batch-modify the metadata of multiple PDF files, and demonstrates the actual results through before-and-after screenshots. It is suitable for scenarios such as document organization, e-book management, and enterprise document standardization.

When organizing a large number of PDF files, many users encounter a very specific but easily overlooked issue: the file content is ready, but in the PDF document properties, metadata such as title, author, subject, and keywords are empty, or are filled inconsistently across different files. Especially for PDFs converted from Word, docx, doc, web pages, scanned copies, or third-party tools, the document properties often retain old information, lack author information, or even have an empty title. Manually modifying a single file is acceptable, but if dozens or hundreds of PDFs need to be set uniformly, opening the properties window and filling them in one by one will take a lot of time.

This article addresses exactly this problem: using the office software " HeSoft Doc Batch Tool ", batch modify metadata such as author, title, subject, and keywords in multiple PDF files. Its core value lies in batch processing files, reducing repetitive work, and turning the originally one-by-one PDF document property maintenance work into a workflow of one-time import, one-time setting, and unified output.

Applicable scenarios: when do you need to batch modify PDF metadata

PDF metadata does not directly appear in the page body, but it does appear in document properties, library indexes, site search, archiving systems, and some document management platforms. For enterprise and individual users, unified PDF metadata helps with subsequent retrieval, classification, copyright identification, and document management.

Common scenarios include:

• Internal enterprise document archiving: you need to unify the author of a batch of training materials, policy documents, and contract templates to the company or department name.
• Organizing e-books or learning materials: you want to complete the title, subject, and keywords for easier retrieval in readers or file management systems.
• Checking papers, reports, and courseware before distribution: avoid residual incorrect authors, old titles, or irrelevant keywords in PDF properties.
• After batch conversion from Word, docx, or doc to PDF: you need to uniformly write PDF document properties to ensure file metadata standardization.
• Pre-processing before uploading for SEO or knowledge bases: use title, subject, and keywords to make documents easier to identify within the system.

If you are only processing one PDF, manually opening the document properties and filling them in is enough; but when the number of files reaches more than 10, using a batch processing tool will significantly save time and reduce the risk of omissions.

Preview of results: PDF metadata is empty before processing

Before processing, we can see in the "Document Properties" window of a PDF reader that the title, author, subject, and keyword fields are all empty. In other words, although this PDF has body content, from the perspective of document properties, it lacks the basic information that can be used for identification and retrieval.

The areas marked with red boxes in the screenshot include fields such as "Title", "Author", "Subject", and "Keywords". For a single file, users can fill them in manually; but for a batch of PDF files, if each one requires repeatedly opening, entering, and confirming, the efficiency will be very low. More importantly, manual operation is prone to spelling inconsistencies, for example, the author is sometimes written as Jack and sometimes as Jcak, which will cause confusion during later organization.

Preview of results: PDF author, title, subject, and keywords have been written after processing

After batch processing is completed, open the document properties of the output PDF again, and you can see that the corresponding fields have been written with new metadata information. For example, the title is set to Title for 2026, the author is Jack, the subject is How to learn English, and the keyword is 2026.

From the processed screenshot, it can be seen that the page content itself has not been changed; what has changed is the document properties of the PDF file. For users who need unified PDF management, this method can quickly supplement or correct document metadata without affecting body layout and page count.

Operation steps: batch modify PDF metadata using office software

Step 1: Enter PDF tools and select "Modify PDF Metadata"

After opening HeSoft Doc Batch Tool , select the "PDF Tools" category on the left. The main interface of the software will display multiple PDF batch processing functions in card form, such as PDF optimization and compression, deleting blank PDF pages, deleting metadata in PDFs, and modifying PDF metadata. According to the screenshot, you need to select "34. Modify PDF Metadata".

The purpose of this step is to enter the function module specifically used for modifying PDF document properties. In the screenshot, the function description says it can batch modify information such as title, author, subject, and keywords in PDF files, which completely corresponds to the problem addressed in this article. After entering this function, the subsequent operations will revolve around importing files, setting metadata, selecting a save location, and starting processing.

Step 2: Add the PDF files to be processed

After entering the "Modify PDF Metadata" function, the top of the interface shows the complete process: select the records to be processed, set processing options, set save location, and start processing. The first step is to add the PDF files to be processed to the list. In the screenshot, the buttons include "Add Files", "Import Files from Folder", "Clear", "More", and so on.

If there are not many PDF files to process, you can click "Add Files" and manually select one or more PDFs; if the files are concentrated in a certain folder, you can use "Import Files from Folder" to reduce the time spent selecting them one by one. After importing, the list will display the sequence number, name, path, extension, creation time, and modification time, making it easy to verify whether the files are correct. In the screenshot, four files have already been imported: 1.pdf, 2.pdf, 3.pdf, and 4.pdf, all with the pdf extension, indicating that these files have entered the pending processing queue.

At this step, it is recommended to carefully check the file paths, especially when there are many files with the same name, to confirm that the PDFs in the list are the ones whose metadata really needs to be modified this time. If a file was added by mistake, you can remove it using the delete operation on the right side of each row; if the list needs to be reorganized, you can also use "Clear" and import again.

Step 3: Set the PDF metadata fields to be written

After confirming that the file list is correct, click "Next" at the bottom to enter "Set Processing Options". In this interface, you can see multiple metadata fields that can be set, including title, author, subject, keywords, creation date, application, producer, and so on. In the screenshot, the switches for title, author, subject, and keywords are enabled, and the corresponding content has been filled in respectively.

From the screenshot, it can be seen that the information filled in for this example is as follows:

• Title: Title for 2026
• Author: Jack
• Subject: How to learn English
• Keyword: 2026

The switches here are very important. Enabling a field means that the software will write that field into all PDF files to be processed; fields that are not enabled will not participate in this modification. This avoids accidentally changing properties that do not need adjustment. For example, if you only want to unify the author and keywords, enable only author and keywords; if you want the title and subject to remain unchanged, do not turn on the corresponding switches.

For batch processing, it is recommended to organize a unified naming convention in advance. For example, the author can use the company name, department name, or project leader's name; the title can use a unified project name; the subject can describe the document category; and keywords can be filled with the year, project number, course name, or business tags. In this way, the processed PDF files will be more valuable for retrieval and archiving.

Step 4: Set the save location and start processing

After completing the metadata entry, continue to click "Next" to enter "Set Save Location". Although the current screenshot does not show the detailed layout of that page, it is clear from the process bar that the software will require you to set the save location before starting processing. The purpose of this step is to determine where the batch-modified PDF files will be output.

It is recommended not to overwrite the original files directly. Especially when batch modifying a large number of PDFs, a more prudent approach is to choose a new output folder. In this way, even if the entered content needs adjustment, the original files can still be retained as backups. After the setting is completed, enter "Start Processing" and let the software batch write the metadata.

After processing is complete, you can randomly open one of the output PDFs and go to the document properties window for verification. The processed screenshot earlier has already shown that the title, author, subject, and keywords were all successfully written, indicating that the batch modification has taken effect.

Common issues and precautions

1. Will batch modifying PDF metadata change the body content?

Usually not. The example in this article modifies metadata information in PDF document properties, such as title, author, subject, and keywords, rather than modifying the PDF page body, images, or layout. Therefore, after processing, the page count and page content should remain consistent.

2. Are all PDFs suitable for batch modification?

Most regular PDFs can be processed. However, if a PDF file is encrypted, restricted by permissions, or the file itself is damaged, the processing result may be affected. Before batch processing, it is recommended to test with a small number of files first and confirm that the output meets expectations before processing a large number of files.

3. How should keywords be filled in?

Keywords can be filled with terms that help retrieval, such as year, project name, course name, department name, product name, and so on. Do not pile up irrelevant words just for the sake of search; keeping them accurate and concise is more conducive to later management.

4. Is it possible to modify only the author without changing the title?

Yes. According to the setting method in the screenshot, each field has an independent switch in front of it. Enable only the fields that need to be modified; unenabled fields will not participate in this batch writing.

Summary: leave repetitive PDF property maintenance to batch processing tools

Batch modifying PDF metadata may seem like merely filling in the author, title, subject, and keywords, but in fact it can significantly improve document management efficiency. For scenarios such as enterprise archiving, organizing learning materials, e-book classification, and standardized processing after Word-to-PDF conversion, unified metadata can make files easier to retrieve and distribute, and can also reduce the management costs caused by disorganized document properties.

HeSoft Doc Batch Tool , as a batch file processing software designed for office scenarios, can centrally complete the originally repetitive and mechanical PDF property modification work. It is recommended that before processing, you first organize the metadata entry rules, then import files, enable the fields that need to be modified, set the output location, and start processing. This ensures accuracy while maximizing time savings.