Many PDF files are named with temporary names like 1.pdf, 2.pdf after being received or scanned, but the truly valuable contract numbers or order numbers are often within the PDF content. This article introduces a method more suitable for batch office processing: Use HeSoft Doc Batch Tool , enter the "Rename PDF Files Using File Content" feature, import multiple PDFs and use an expression to match 8 consecutive digits, then overwrite the original filenames with the match results. After processing, the filenames will automatically become the numbers in the document body, making them easier to search, archive, and share.
In daily office work, PDF files often come from email attachments, scanned archives, system exports, or third-party transmissions. The file content may be well-structured, containing key information such as contract numbers, order numbers, and customer IDs, but the file names are often arbitrary, like "1.pdf," "2.pdf," "3.pdf." When these files need to be placed into project archives, contract ledgers, or shared folders, using temporary file names makes subsequent searching very troublesome.
The traditional approach is to open each PDF individually, find the reference number in the text, and then go back to the folder to manually rename it. This method seems simple, but it consumes a significant amount of time when there are many files, and it is prone to issues like misreading numbers, missing digits during copying, and duplicate file names. The method introduced in this article uses batch file processing software designed for office scenarios, like HeSoft Doc Batch Tool , to match reference numbers from PDF content using expressions and automatically write the number into the file name.
The goal in this article's example is clear: batch-change PDF file names that originally had no business significance to the 8-digit contract number found within the PDF body. The entire process will be illustrated with screenshots showing the pre-processing state, software setup steps, and the post-processing naming effect, helping you understand how to combine "search by content" and "batch rename PDFs".
Applicable Scenarios: Extracting Reference Numbers from PDF Content for File Naming
Automatic renaming based on PDF content is suitable for materials with irregular file names but well-structured body information. For instance, contract front pages usually contain "Contract No."; order files contain "Order No."; invoices, receipts, inspection reports, and test certificates also often include unique reference numbers. As long as these numbers have a relatively fixed format within each PDF, expressions can be used for batch matching.
The example in this article uses a continuous 8-digit number. For such numbers, a regular expression like "\d{8}" can be used for extraction. Although many users habitually call such rules wildcard expressions, the corresponding input field in the software interface is the "Regular Expression" input box. Their common function is to describe the text to be found using rules, rather than entering specific content one by one.
This type of method is particularly suitable for the following office needs:
- Batch organizing contract PDFs, renaming files to contract numbers.
- Batch organizing customer materials, renaming files to customer IDs or archive numbers.
- Batch organizing order PDFs, renaming files to order numbers for easy reconciliation with Excel ledgers.
- Batch organizing reports or certificates, renaming files to report numbers or testing numbers.
- Unifying downloaded or scanned temporary PDF files into searchable, standardized names.
Compared to manual renaming, using office software for batch processing maintains rule consistency and reduces repetitive work. The efficiency gain is especially noticeable in scenarios with many files and uniform naming rules.
Effect Preview: From Meaningless Sequential Numbers to Searchable Contract Numbers
Before Processing: File Names are Just Simple Numbers
In the pre-processing folder, the PDF files are named "1.pdf, 2.pdf, 3.pdf, 4.pdf". These names only indicate file order and cannot reflect contract numbers, customer information, or business content. The more files there are, the higher the management cost imposed by this naming convention.
If a colleague asks to find the file with contract number "10026877", you cannot directly search for it in the folder and must open each PDF to check individually. This is the core pain point this article aims to solve: the file content has a reference number, but the file name does not.
Extractable Reference Numbers Exist in the PDF Body
Upon opening one of the PDFs, you can see the contract number at the top of the contract body. In the screenshot, the red arrow and red box highlight "10026877," the target text, located after "Contract No." It serves as a unique identifier well-suited for a file name.
As long as the other PDFs also contain an 8-digit number in the same format, they can be batch-identified using an expression. The rest of this article will use "\d{8}" to match a continuous 8-digit number and overwrite the original file name with the matched result.
After Processing: File Names Automatically Become the Body's Reference Numbers
After batch processing is complete, the PDF names in the folder have changed from the original sequential numbers to the contract numbers. The result is as follows:
As can be seen, the processed file names include "10026877.pdf, 20036655.pdf, 20100511.pdf, 33952100.pdf". These names are clearer, directly reflecting the file content and making it easy to correspond with numbers in contract ledgers, customer materials, email records, or business systems.
Operational Steps: Batch Renaming PDF Files Using Expressions
Step 1: Select the PDF Content Rename Function in the File Name Category
After launching HeSoft Doc Batch Tool , you can see multiple tool categories on the left, including File Name, Folder Name, File Organize, Word Tools, Excel Tools, PowerPoint Tools, PDF Tools, etc. As this article deals with file names, first enter the "File Name" category.
Among the function cards, select "Rename PDF files using file content". This function's description is to batch-use certain text from PDF file content as the file's name, perfectly matching the need in this article to rename PDFs by contract number.
The expected outcome of this step is to enter a wizard-style processing interface. Subsequent operations will revolve around four segments: selecting records to process, setting processing options, setting the save location, and starting processing. This process is suitable for batch file operations because each step can be confirmed before proceeding, reducing the chance of operational errors.
Step 2: Import PDF Files to be Renamed and Check the List
After entering the "Rename PDF files using file content" page, the first step is to add the files to be processed. In the upper-right corner of the interface, you can see buttons like "Add Files," "Import Files from Folder," "Clear," and "More." For a small number of files, you can use "Add Files"; if an entire folder contains the PDFs to be processed, you can use "Import Files from Folder."
The screenshot shows 4 imported records, named "1.pdf, 2.pdf, 3.pdf, 4.pdf" respectively, located in a test directory on the D drive, all with the pdf extension. After importing, focus on checking three points: first, is the file count correct; second, are the extensions all PDFs that need processing; third, have any unrelated files been mixed into the list.
If files that do not need processing appear in the list, they can be removed via the delete button in the operation column; if the import is wrong, you can use "Clear" and then re-add. After confirming everything is correct, click "Next" at the bottom to proceed to setting processing options.
Step 3: Select "Text Matched by Custom Formula" as the Search Area
On the "Set Processing Options" page, you first need to determine from which part of the PDF the software should extract text. The "Search Area" in the interface provides multiple options, including "First line of text," "First barcode image," and "Text matched by custom formula."
Since the contract number is not necessarily the first line of the PDF, and we need to use a rule to match 8-digit numbers, select "Text matched by custom formula." In the screenshot, this option is already selected.
The significance of choosing this item is: the software will not simply take text from a fixed position but will search for the target content in the PDF body according to the expression you fill in. This method is usually more flexible for files with different contract layouts or headers but with a consistent reference number format.
Step 4: Enter "\d{8}" in the Regular Expression Input Field
Fill in "\d{8}" in the "Regular Expression" input box. Here, "\d" represents a digit, and "{8}" means it occurs 8 consecutive times, so the entire expression means "match 8 consecutive digits." The contract numbers in the example PDFs are exactly 8 digits, so they can be identified by this rule.
This step is the core of batch-renaming PDF files. You don't need to know the specific reference number of each PDF, nor do you need to prepare a list of numbers in advance. You just need to tell the software "what the reference number looks like." The software will execute the same matching logic on each PDF and use the matched text for naming.
If your actual files do not use 8-digit numbers but follow other rules, the expression should be adjusted according to the reference number format. For example, numbers might contain letters, hyphens, or years. However, the screenshot shown in this article is for 8-digit matching, so the example is based on "\d{8}" and does not fabricate other interface functions.
Step 5: Set the Match Result to Overwrite the Entire File Name
In the "Position" area, select "Overwrite the entire file name." After this processing, the original file name body will be replaced by the matched reference number, while the file extension remains pdf. Using the example files, "1.pdf" will become "10026877.pdf."
This setting is suitable for scenarios where complete file name standardization is desired. If the original file name has no retention value, directly overwriting the entire file name is the clearest approach. If your actual business needs require keeping the original name, you can also consider adding it to the left or right based on the position options provided in the interface, but the final effect demonstrated in this article is a complete replacement with the reference number.
Step 6: Set the Save Location and Execute Batch Processing
After completing the expression and naming position settings, click "Next". The subsequent interface flow includes "Set Save Location" and "Start Processing." Follow the wizard prompts to complete the save location setting, then start the processing. After processing is finished, open the target folder, and you will see that the PDF file names have been changed to the 8-digit numbers from the file body.
For important materials, it is recommended not to process all files at once. First, select a few representative PDFs for testing, confirm that each file correctly extracts the right number, and then batch-process the entire folder. This verifies the expression's accuracy and prevents naming results that don't meet expectations due to differences in file formats.
Frequently Asked Questions and Notes
1. What to Do If the Expression Does Not Match a Reference Number?
First, confirm whether the reference number in the PDF body is recognizable text. If the PDF is a pure image scan, the software may not read the text directly. Second, confirm whether the expression matches the reference number's format. For example, if the number is not 8 digits, "\d{8}" may not be applicable.
2. Why Check the File List Before Processing?
The advantage of batch processing is handling multiple files at once, but it also means errors are magnified across the batch. If unrelated PDFs are imported, or other materials are mixed into the folder, unwanted naming results may occur. Therefore, verifying the names, paths, and record count in the first step's list is very important.
3. Will "Overwrite the entire file name" Change the PDF Extension?
Looking at the example results, the processed files are still in PDF format, with the extension remaining ".pdf". "Overwrite the entire file name" primarily replaces the file name body, changing the original "1," "2," "3" into the matched reference number.
4. What to Watch Out for When Multiple Files Match the Same Reference Number?
If different PDFs contain the same reference number, duplicate file names might occur. When processing files with unique numbers like contracts or orders, first confirm that the numbers themselves are unique. For files that may have duplicates, conduct small-scale testing to ensure the processing results comply with archiving rules.
5. Is This Method Only Applicable to PDFs?
This article demonstrates PDF files because the function name in the screenshot is explicitly "Rename PDF files using file content". Other categories like Word Tools and Excel Tools are visible in the HeSoft Doc Batch Tool interface, but this article does not expand on other format functions. For office documents like doc, docx, xls, xlsx, process them according to the corresponding function entry and actual interface in the software.
Summary: Transforming PDF Renaming from Manual Operation to Rule-Based Batch Processing
This example shows that batch renaming PDFs is not necessarily limited to modifications based on the original file name; it can also generate more meaningful new names based on the PDF body content. For files with chaotic original names but well-structured body reference numbers, using expressions to extract these numbers is a highly efficient office processing method.
The value of HeSoft Doc Batch Tool lies in streamlining repetitive file organization actions: importing files, setting matching rules, choosing a naming position, and executing batch processing. Compared to manually opening PDFs and renaming them one by one, this method is more suitable for high-frequency office scenarios like contract archiving, order organization, and project material handovers.
If you are organizing a batch of PDF files with chaotic names, start by opening a few to confirm the reference number format, then follow the method in this article using an expression like "\d{8}" for small-batch testing. After confirming the effect is correct, batch-process the complete folder to quickly obtain standardized, searchable, and easy-to-share PDF file names.