Many contracts, application forms, and receipts may still be in an editable state after adding forms, signatures, or stamps in PDFs, posing risks for archiving, distribution, and printing. This article uses HeSoft Doc Batch Tool as an example to demonstrate how to batch import multiple PDFs at once and use the "Flatten PDF" feature to solidify the current appearance of form fields, stamps, etc., into regular page content, making the files more suitable for delivery, archiving, and bulk distribution.
In daily office work, PDFs are often used to carry formal documents such as contracts, approval forms, quotations, registration forms, and acceptance certificates. Many documents have form fields, signatures, date stamps, company seals, or annotation marks added during circulation. The problem is that this content may remain as "selectable, movable, and deletable" objects in some PDF readers, rather than being part of the page itself. For documents that need to be sent externally, archived, submitted for review, or printed in batches, this leads to two obvious issues: first, the recipient might see edit boxes or selection borders when opening the file; second, stamps and form content may be accidentally deleted or altered, affecting the document's consistency and reliability.
If there is only one PDF, manually opening, saving as, or printing it as a PDF might be manageable; but when dozens or hundreds of PDFs in a folder need the same processing, repeatedly opening files is very time-consuming. HeSoft Doc Batch Tool is batch-processing software designed for office scenarios. Its PDF toolset provides the "Flatten PDF" capability, which can batch-process the current appearance of form fields in PDF files and solidify them into standard page content. This article will guide you through the complete process, from importing multiple PDFs to batch processing, with illustrative screenshots.
Applicable Scenarios: Which PDFs Are Suitable for Flattening
PDF flattening is neither simple compression nor converting the PDF to images. Its core function is to fix interactive, editable page elements onto the page based on their current display appearance. Considering practical office work, the following types of files are particularly suitable for batch flattening before sending or archiving:
- Contract PDFs with stamps: For example, date stamps, cross-page seals, approval stamps, and received stamps. Flattening reduces the risk of these stamps being moved or deleted.
- PDFs with form fields: Such as fillable fields for names, phone numbers, amounts, addresses, and checkboxes. After flattening, the currently filled-in results become standard page content.
- Process documents with signatures or annotations: Internal approval, acceptance confirmation, and financial reimbursement attachments may have compatibility issues when sent externally if annotations remain independent objects.
- Materials for batch submission to platforms: Some platforms only accept PDFs with a fixed appearance to avoid form controls displaying inconsistently in different readers.
- Long-term archiving files: Archived files prioritize stable display and immutability, and flattening makes the page presentation closer to the final version.
It is important to note that flattening is generally an operation for the "final draft". After processing, originally editable forms or stamps become standard page content and are no longer suitable for continued use as fillable form templates. Therefore, it is recommended to keep the original files before processing, or set a new save location in the software to output the processed results.
Effect Preview: PDF Stamp Is Still Selectable Before Processing
In the example below, the folder contains multiple PDFs like 1.pdf, 2.pdf, 3.pdf, 4.pdf, and 5.pdf, indicating that the requirement here is not to process a single file, but to perform unified processing on a batch of PDFs.
After opening one of the PDFs, you can see a red date stamp on the right side of the page. Before processing, this stamp is in a selectable state, showing a blue selection box and control points around it, indicating it is still an independent object or interactive element within the PDF. For contract signing pages, confirmation pages, or approval pages, this state is not ideal: if the recipient makes an accidental operation, the stamp's position might be moved; using a different reader might also cause issues like selection boxes appearing, layering display problems, or printing anomalies.
Effect Preview: Stamp Solidified into Standard Page Content After Processing
After the "Flatten PDF" process, opening the same page location shows the red date stamp retaining its original visual effect, but no longer displaying a blue selection border. It has been solidified into the page display, behaving more like part of the PDF body content. For documents that need to be sent in bulk to clients, suppliers, finance, legal, or archival management personnel, this result is more stable and aligns better with the delivery habits for final version documents.
Visually, flattening does not change the stamp content itself; for example, the "2026.07.30" in the example remains clearly visible. What changes is the object's property: before processing, it might be a selectable object, and after processing, it becomes standard page content. This is precisely the value of batch flattening PDFs.
Operation Steps: Batch Flattening PDFs Using HeSoft Doc Batch Tool
The specific operations are explained below, following the sequence of screenshots. There might be slight differences in the interface between different versions, but the overall process is generally: enter the PDF tools, select "Flatten PDF", import files, set the save location, and then start batch processing.
Step 1: Enter PDF Tools and Find "Flatten PDF"
After opening HeSoft Doc Batch Tool , select "PDF Tools" from the left navigation bar. The right side displays multiple PDF-related batch processing functions, such as adding page numbers, extracting and merging pages, adding page margins, removing links in PDFs, cropping PDF pages, modifying page layouts, and reversing the order of PDF pages. Among these function cards, find "21. Flatten PDF". The description for this function card in the screenshot is "Batch flatten PDF files, solidifying the current appearance of form fields into standard page content", which aligns with the form and stamp solidification need addressed in this article.
The purpose of this step is to select the correct processing tool. Since there are many functions in the PDF tools, it is recommended to confirm the card name is "Flatten PDF" before entering, to avoid mistakenly selecting other functions like compression, conversion to image, or conversion to Word.
Step 2: Add the PDF Files to Be Processed
After entering the "Flatten PDF" page, the current function name is displayed at the top of the interface, and the file list area is in the middle of the page. You can see the process is divided into three stages: Step 1 "Select records to process", Step 2 "Set save location", and Step 3 "Start processing". In Step 1, you can select PDFs individually via "Add Files" or import multiple PDFs from a folder at once via "Import files from folder".
The list in the screenshot has already been imported with 5 files, named 1.pdf, 2.pdf, 3.pdf, 4.pdf, and 5.pdf respectively; the table also displays information like path, extension, creation time, and modification time. The benefit of this is that you can quickly confirm whether the correct files have been imported before processing. This step is very important for batch office tasks: if a specific PDF does not need processing, it can be removed from the list via the delete operation on the corresponding row; if the wrong batch was imported, you can also use the "Clear" option on the interface to reselect.
Step 3: Confirm File Records and Proceed to Next Step
After the files have been imported, it is recommended to first check the summary information at the bottom of the list. In the example, the record count is 5, indicating that 5 PDFs will be processed in this batch. After confirming that it is correct, click the "Next" button at the bottom to proceed to the save location settings. This allows for separate management of "selecting files" and "output settings", avoiding confusion between original and result files when handling a large number of files.
The expected outcome of this step is that all PDFs requiring flattening have been added to the pending processing list, and the file paths and extensions are all correct. For cases involving imports from multiple folders, pay particular attention to the path column to ensure no test files or temporary files have been imported.
Step 4: Set Save Location to Avoid Overwriting Important Originals
In the screenshot, you can see Step 2 is "Set Save Location". When batch processing PDFs, it is recommended to save the processed files to a new output folder, such as "Flattened", "Final PDFs", or an archive directory corresponding to the project. This preserves the original PDFs for potential future rework while also allowing centralized management of the processed files.
Since flattening solidifies the current appearance of form fields, stamps, etc., into standard page content, the processed files are more suitable as the final delivery version. If you later need to modify the form, re-apply a stamp, or adjust annotations, you should typically go back to the original file for modification and then re-execute the flattening process. Therefore, setting the output location is not only a file saving issue but also a matter of document version management.
Step 5: Start Processing and Check the Results
After completing the save location setting, proceed to Step 3 "Start Processing". The software will batch process the PDFs according to the records in the list. Once processing is complete, open the output files for spot-checking, focusing on whether stamps, form fields, or annotations that were previously selectable have been solidified into standard page content. The date stamp in the example no longer shows a selection border after processing, indicating the flattening result meets expectations.
If the processed files are contract-type PDFs, it is recommended to at least spot-check the first page, signing page, sealing page, and last page; for form-type PDFs, focus on checking whether the filled fields, checkboxes, signature areas, and date areas display normally. While batch processing saves significant time, conducting spot checks before formal archiving remains a reliable office procedure.
Common Questions and Considerations
1. Will flattening a PDF delete stamps?
Based on the example effect, flattening does not delete stamps; instead, it solidifies the current display appearance of the stamp onto the page. After processing, the stamp remains visible, but it is no longer selectable as an independent object like it was before processing.
2. Can I continue to edit form fields after flattening?
It is generally not recommended to use a flattened PDF as a fillable form for continued editing. The purpose of flattening is to fix the current appearance, making it more suitable for final, archived, or externally distributed versions. If continued filling is needed, the unflattened original PDF should be retained.
3. Why batch process instead of opening and saving each one individually?
When the number of files is small, manual processing might seem feasible; however, once multiple projects, multiple contracts, or dozens of forms are involved, manually opening, checking, and saving each file consumes significant time and increases the risk of missing a file. The advantage of HeSoft Doc Batch Tool lies in importing multiple PDFs at once and executing the same processing task uniformly, reducing repetitive labor.
4. Is a backup needed before processing?
It is recommended to keep the original files, especially business documents with forms, signatures, or stamps. You can output the flattened results to a new save location, thus obtaining both the final version PDF and retaining the editable source file.
5. What is the difference between flattening and PDF compression or conversion to image?
Compression primarily focuses on file size, and conversion to image mainly alters the page rendering method. Flattening focuses on solidifying the current appearance of form fields, stamps, etc., in the PDF into standard page content. It is more suitable for solving issues like "objects being selectable or editable", "inconsistent display across different readers", and "the need for a fixed appearance in archived files".
Summary
Batch flattening content such as forms and stamps in PDFs is a necessary step in many contract archiving, approval circulation, and document distribution scenarios. Using the "Flatten PDF" function of HeSoft Doc Batch Tool , you can add multiple PDFs to the task list, uniformly set the save location, and perform batch processing, avoiding manual file-by-file operations. After processing, stamps or form fields that were originally selectable remain as standard page content, resulting in more stable file display that is better suited for delivery and long-term preservation.
If you have a batch of filled-in, stamped, or annotated PDFs ready to be sent to clients, submitted to a platform, or organized for archiving, it is recommended to first use "Flatten PDF" to generate final versions in batches before distributing or saving them. This not only improves processing efficiency but also reduces the risk of file content being accidentally altered.