Many PDF file names consist only of serial numbers, but the actual content contains useful contract numbers, document numbers, or report numbers. This article uses HeSoft Doc Batch Tool as an example to demonstrate how to import multiple PDF files, use custom expressions to match consecutive 8-digit numbers, and overwrite the matched numbers as new PDF file names, helping users quickly complete batch PDF renaming and document archiving.
In daily office work, PDF files often come from scans, system exports, email attachments, or batch downloads. After downloading, the file names might only be temporary serial numbers like 1.pdf, 2.pdf, 3.pdf. The contract numbers, customer IDs, and order numbers truly used for archiving and retrieval are inside the PDF page content. Faced with dozens, hundreds, or even more PDFs, opening each one, viewing it, copying the number, closing it, and renaming it is a massive workload. Moreover, the more repetitive the operations, the more prone they are to errors.
This article introduces a more suitable method for office batch processing: using the "Rename PDF files using file content" feature in HeSoft Doc Batch Tool . Match the numbers in the PDF content using wildcard expressions or regular expressions, and then set the matched text as the file name in batch. In the example, the contract PDF body contains an 8-digit contract number, such as 10026877. Before processing, the file name is 1.pdf. After processing, it automatically becomes 10026877.pdf. This reduces manual renaming and allows the file names to directly reflect business information.
Applicable Scenario: Extracting Numbers from PDF Content as File Names
This method is suitable for all PDF documents where "the file name is irregular, but the file body contains a fixed number". Common scenarios include naming contract PDFs by contract number, invoice PDFs by invoice number, report PDFs by report number, order PDFs by order number, and archive PDFs by archive number. As long as the target text has a relatively stable format within the PDF, you can try to match it using an expression.
For example, the first page of some contracts might state Contract No. 10026877; the first page of some reports might display "Report No." followed by a string of numbers; some documents might display an 8-digit, 10-digit, or letter-prefixed number. If this content can be read as text by the software, it can serve as the basis for batch renaming. Compared to manual processing, the advantage of expression matching lies in setting a rule once and executing it for multiple files simultaneously, which is highly suitable for repetitive file organization tasks.
It should be noted that the functional interface in the screenshot uses "Regular Expression" to set matching rules. Many users habitually refer to these types of rules as wildcard expressions, because they do not input a specific fixed file name, but rather a matching pattern. In this example, \d{8} is used to match a sequence of 8 consecutive digits. It can match different contract numbers in different PDFs without needing to set up rules for each file individually.
Effect Preview: From Meaningless Serial Numbers to Searchable Number File Names
Before Processing: The folder contains only 1.pdf, 2.pdf, 3.pdf, 4.pdf
The file list before processing is very typical: multiple PDF files named with numeric serial numbers. Such names are inconvenient for searching and for multi-person collaboration. For instance, if a colleague asks you to send the file corresponding to contract number 10026877, you cannot determine if 1.pdf is the target contract based on its name alone; you have to open each PDF to check individually.
After opening the PDF, you can see that the document content contains the "Contract No." field, followed immediately by an 8-digit number. The red box and arrow in the screenshot point to 10026877. This number is the text to be extracted during the subsequent renaming.
After Processing: File names become number formats like 10026877.pdf
After completing the batch processing, the file names have been replaced with the numbers from the PDF content. The original 1.pdf, 2.pdf, 3.pdf, 4.pdf have become 10026877.pdf, 20036655.pdf, 20100511.pdf, 33952100.pdf respectively. The numbers are identifiable at a glance from the file names, making subsequent operations clearer, whether searching in File Explorer or uploading to a business system.
Operation Steps: Complete Batch PDF Renaming Following the Screenshot Order
Step 1: Find the PDF content renaming feature in the File Name category
After opening HeSoft Doc Batch Tool , first look at the left navigation bar. The software organizes common office batch processing capabilities by category, including File Name, Folder Name, File Organization, Word Tools, Excel Tools, PowerPoint Tools, PDF Tools, Text Tools, Image Tools, etc. The current goal is to batch modify PDF file names, so enter the "File Name" related functions.
In the function cards of the main area, select "7. Rename PDF files using file content". The card description is "Batch set certain text from the PDF file content as the file name for that file". This sentence clearly explains the function's purpose: it's not simply adding a prefix or suffix to file names, nor replacing text within the original file name, but finding specific text inside the PDF body and using it to generate the file name.
The expected result of this step is to enter the corresponding function page. For first-time users, choosing the right tool is very important. Because the same office batch processing software might simultaneously include multiple functions like file name replacement, text insertion, adding prefixes/suffixes, adding parent folder names, naming by document page count, etc. Only "Rename PDF files using file content" meets the requirement of this article.
Step 2: Add PDF files to create the pending processing record list
After entering the function, the tool name is displayed at the top of the page. The progress bar shows four stages: Select records to be processed, Set processing options, Set save location, Start processing. Currently at step 1, you need to add the PDFs to be processed into the list.
You can see buttons like "Add File", "Import Files from Folder", "Clear", "More" on the top right of the interface. If the number of files is small, you can use "Add File" to select them individually; if a large number of PDFs are in the same directory, using "Import Files from Folder" is usually more convenient. The screenshot shows that 4 PDFs have been imported, and the table lists the serial number, name, path, extension, creation time, modification time, and operation information.
At this step, focus on verifying two things: first, whether all files in the list are PDFs that need renaming; second, whether the record count matches expectations. The bottom of the screenshot shows a record count of 4, consistent with the 4 PDFs in the pre-processing folder. After confirming correctness, click "Next" at the bottom to enter the rule settings.
Step 3: Select "Text matched by custom formula" as the search area
After entering Step 2 "Set processing options", you first need to decide from which position in the PDF the software should look for the content to use for naming. In the screenshot, under "Search Area" there are several options, including "First line of text", "First barcode image", "Text matched by custom formula". The option selected in this example is "Text matched by custom formula".
Why not choose the first line of text? Because the contract number in the example PDF is located in the page body area, not the first line of the document. Why not choose the barcode image? Because the number in the screenshot is in text form, not a barcode. After selecting the custom formula, you can use an expression to tell the software what format of content to look for. This is especially useful for materials like contract numbers and document numbers where the position is not completely fixed but the format is relatively stable.
Step 4: Fill in \d{8} in the Regular Expression field
In the "Regular Expression" input area, fill in \d{8}. This rule is used to find a sequence of 8 consecutive digits. It does not care what the specific number is, only whether the format matches "8 digits appearing consecutively". Therefore, when different PDFs contain 10026877, 20036655, 20100511, 33952100 respectively, they can all be matched by the same rule.
This is the key to batch processing. If using a manual method, you would need to find the number for each file individually; if using fixed text replacement, you could only process one number. Expression matching allows you to hand the "pattern of the number" to the software, letting it automatically find the corresponding content in each PDF. For a large number of PDF files, this approach significantly reduces repetitive work.
Of course, the actual number format in your work may differ. This article's example is 8 pure digits, so \d{8} is used. If your numbers have other lengths, or contain letters, hyphens, or prefixes, you need to adjust the rule according to the actual pattern. It is recommended to observe several sample PDFs first to confirm whether all numbers conform to the same format before performing batch operations.
Step 5: Select "Overwrite entire file name" to make the number the new PDF name
In the "Position" setting, the screenshot shows "Overwrite entire file name" is selected. This option means using the matched text as the main body of the complete new file name. That is, the original file names 1, 2, 3, 4 will be replaced with the matched numbers, while the extension remains pdf. After processing, you will get naming results like 10026877.pdf.
If you only want to append the number to the front or back of the original file name, you can choose according to the options "On the left of the file name" or "On the right of the file name" in the interface. However, for scenarios like contract archiving or report archiving, it is usually more desirable for the file name to directly equal the business number for easy retrieval and sorting, so "Overwrite entire file name" is a commonly used setting.
Step 6: Continue to set the save location and start processing
After completing the rule settings, click "Next" at the bottom. Following the page flow, the subsequent steps will involve "Set save location" and "Start processing". The purpose of these two steps is to determine where the processed files will be saved and to officially execute the batch renaming task. Since the screenshot does not show the specific save location page, you can follow the software wizard prompts during actual operation.
Before formal processing, it is recommended to confirm whether the original PDFs need to be preserved. If these files are important contracts, financial documents, or customer data, it is best to back them up first, or save the processing results to a new location. Batch processing is highly efficient, but if the rules are set inaccurately, it can also batch-produce unexpected file names. Therefore, testing first and then executing in large batches is a safer approach.
Common Questions and Notes
What could be the reason if the expression does not match any numbers?
First, check if the numbers in the PDF can be recognized as text. If the PDF is a scanned image, the numbers might be visible to the eye, but the software cannot read them as text, resulting in no match. Secondly, check if the number format is indeed 8 consecutive digits. If the number contains spaces, hyphens, or letters, \d{8} might not be applicable.
How to avoid picking the wrong text if there are multiple 8-digit numbers in the PDF?
This is a very common problem in batch renaming. For example, a PDF might simultaneously contain a contract number, a date, a phone extension, a project number, etc. If multiple items all satisfy the 8 consecutive digits condition, a simple rule may not distinguish them. Before processing, open sample files to check if the target number is unique. If not, you need to refine the matching rules further, trying to make the expression only hit the actual contract number or document number.
Can a large number of PDFs be processed?
Judging from the software interface, this function supports batch importing records via "Import Files from Folder", making it suitable for processing multiple PDF files. During actual use, it is recommended to verify the results with a small number of samples first, then import the complete folder. For hundreds or more files, processing and verifying in batches is safer.
Can this be used for Word, docx, doc, or other files?
The screenshots in this article show the PDF file content renaming function, so the operational steps are based on PDFs. The software interface also shows categories for Word Tools, Excel Tools, PowerPoint Tools, Text Tools, etc., and under the File Name category, there are other functions related to content renaming. For file types like docx, doc, txt, you should choose based on the corresponding file type function in the software and not directly apply the PDF steps to all formats.
How to verify the results after renaming?
After processing is complete, you can first check in the folder whether the file names meet expectations, then randomly open a few PDFs to confirm that the numbers in the file names match the numbers in the PDF bodies. If you find any file names that are empty, duplicated, or clearly do not match the expected number format, you should stop further processing and return to the rule settings to check the expression and search area.
Summary: Delegate the Repetitive Work of Opening and Renaming PDFs to Batch Processing Tools
As seen from the example in this article, using HeSoft Doc Batch Tool , you can transform the repetitive sequence of "opening PDF to check number, copying number, returning to folder, manually renaming" into a batch process of "importing PDFs, setting matching expression, choosing overwrite file name, executing process". For managing documents like contracts, orders, invoices, and reports, this method can effectively improve file organization efficiency.
If your current PDF file names are just serial numbers or gibberish, but the body contains clear numbers, you can refer to the method in this article. First, use a few samples to test whether expressions like \d{8} match correctly, and then batch process all files. Once completed, the file names will directly present business numbers, making searching, archiving, transferring, and sharing much more convenient.