OmniDocHow to delete PDF highlights in batches: Clear multiple highlights at once
When there are too many highlights in the entire PDF and clicking one by one is inefficient, how can I filter by annotation type and delete them all at once? Explain how to determine whether a highlight is a comment or page content, and how to verify it after deletion.
Key points of this article
- Highlights are usually annotation objects, which can be filtered by type in the annotation list and then multi-selected to delete, which is much faster than manually clicking page by page.
- If the highlight is to draw the color directly into the page content, the annotation deletion function will be invalid and you need to return to the original file for processing.
- Blackout (the masking function in the editor) will permanently cover the content and cannot be used to clear highlights. Do not mix the two.
- Save as a new file before deleting to keep the highlighted original to avoid irrecoverability.
- After deleting, use "Compare Two PDFs" to check the differences and confirm that only the highlights are missing and the text and page numbers remain unchanged.
When organizing papers, contracts, or textbooks, many people use highlighters to highlight key points on PDFs. When the document needs to be forwarded to others, submitted for review, or you just want to read the main text, the yellow and green marks all over the page become a distraction. If there are only a few highlights, it is acceptable to click to delete them one by one; a 30-page paper may have hundreds of highlights, and processing them one by one is very time-consuming. How to delete PDF text highlights in batches is a common problem in this type of scenario.
This article is about: first determine which type the highlight on your hand belongs to, then filter by type, delete it all at once, and finally check the results. The method does not depend on a specific software, but it will explain what functions can be used in the OmniDoc desktop PDF editor to assist with inspection.
The prerequisite for batch deletion is that the highlights themselves can be individually identified. In most readers and editors, highlighting is an independent annotation object with its own position, color and type, so it can be filtered, multi-selected, and deleted together. If the highlight is left in another way, you can only change the path.
How to delete PDF highlights in batches? One sentence conclusion
Before clearing the highlight, first confirm whether it is an annotation or page content. This step determines whether it can be processed in batches. The following table lists common situations.
| your situation | Recommended practices | reason |
|---|---|---|
| The highlight is drawn with the reader highlighter, and the color box can be selected and displayed by clicking on it. | Enter the annotation list, filter by "Highlight" type and then delete by multiple selections | Highlighting is an independent comment. Deletion only affects the comment and the text remains unchanged. |
| Highlights mixed with other annotations such as underlines, sticky notes, and hand drawings | Filter only by highlighted type, do not select all | Avoid accidentally deleting other comments |
| There is no response when clicking on the highlight, the color is part of the page | Go back to the original file (such as a Word or LaTeX source file) and re-export the PDF | The color is written into the page content, and deleting the annotation has no effect. |
| Highlights are color shading on scans | First confirm whether the text can be selected, and then decide whether you need to re-obtain the original file. | The shading of the scanned document is usually an image and cannot be deleted as annotation. |
| I just want to hide a piece of content | Use the editor's blackout feature and accept that content is permanently obscured | Blackening will remove the underlying text and is not suitable for clearing highlights. |
Before you start: Confirm these points first
1. Confirm whether the document is original. Batch deletion will change the file content. It is recommended to save the original file first and mark the file name as "original with highlight". If you make a mistake when deleting, you can go back to the original and redo it.
2. Confirm whether the highlight is an annotation. Click anywhere to highlight. If an independent selection box or color bar appears, it is usually an annotation. If only text can be selected after clicking, it means that the color may be part of the page. This step will prevent you from wasting your time.
3. Confirm whether other marks need to be retained. Many people use highlighting, underlining, and sticky notes at the same time in their papers. If you just want to remove highlights, you have to filter by type, not select them all.
4. Confirm whether the document is a scanned copy. The colored areas seen on scans are often part of the image. In this case, batch deletion is invalid. You can first use OCR to identify the text, and then compare it with the original file to determine which content needs to be retained. The recognition results of OCR need to be checked, especially numbers, formulas and proper nouns.
5. Confirm the scope of processing. Whether to delete only the highlights of certain pages or clean the entire document determines whether to limit page numbers when filtering. The smaller the range, the less likely it is to delete by mistake.
Steps to batch delete highlights by type using annotation list
If the highlight is an annotation, you can follow the general process below. The specific entrance varies from software to software, but the idea is the same.
- Open the PDF to be processed. Open the file in a desktop reader or editor that supports annotation management and confirm that the file can be displayed normally.
- Find the comment list. Find the panel or view in the software that displays all comments. It will list the comments in the file by page number.
- Filter by type. Only check the "Highlight" type so that only highlights are displayed in the list, and other annotations are temporarily hidden or unselected.
- Check the filter results. Click on a few randomly to confirm that they are highlights that need to be deleted, and that the page number range is as expected.
- Batch selection. Use Select All or hold down Shift, Ctrl (Command on macOS) to select segments one by one. If you want to delete only some pages, limit the page numbers first and then select.
- Execute deletion. Delete the selected annotation. Most software will pop up a confirmation prompt. After confirmation, the highlight will be removed and the text will remain unchanged.
- Save as new file. After deletion is completed, use "Save As" to save. Do not directly overwrite the original file. The file name can indicate "Highlight Cleared".
If you are working in the OmniDoc desktop PDF editor, please note: The editor's functions include modifying paragraph text, signing, filling out forms, blackening, page manipulation, OCR, comparing two PDFs and exporting, but there is no separate highlight annotation management in the function list. Therefore, batch clearing of highlights is more suitable for use with a reader with an annotation list; an editor is suitable for checking and other organization work before and after deletion.
# check item by item after completion
After batch deletion, do not rush to share or submit, first check according to the table below.
| Check item | What do you think? | What if there's a problem? |
|---|---|---|
| Is the highlight all gone? | Page by page, or reopen the comment list to make sure there are no highlighted entries | If there is still any residue, the content of the page may be highlighted and go back to the original file for processing. |
| Whether the text is complete or not | Spot check a few paragraphs to make sure there are no missing words or misplaced positions. | Restore the original and redo it in a different way |
| Whether other comments have been mistakenly deleted | Check to see if underscores, notes, etc. Are still there | Re-operate from the original, this time select only the highlight type |
| Is the page number and length the same? | Compare the number of pages to check that the page has not been accidentally deleted or moved | Check to see if the page operation function is misused |
| Whether the difference between the manuscript and the original is only highlighted. | Compare the two PDF functions of the editor to compare the original document with the new file | When the difference is beyond the highlight range, check and correct it item by item. |
The comparison function is a direct way of checking. Compare the highlighted manuscript with the cleaned new document, and the differences should only be concentrated in the highlighted position. If there is a change in the text of the text, it means that the operation is wrong and needs to go back to the original and re-deal with it.
# Core comparison
There are three common ways to clear highlights, each with its own applicable scenarios.
| Practice | An appropriate situation | Matters needing attention |
|---|---|---|
| Delete batches by type with an annotation list | Highlights are independent annotations, have a large number, and need to retain other annotations | Filter by type before deletion. Do not select all. |
| Click to delete one by one | There are only a few highlights, which need to be deleted while watching. | Too many pages are time-consuming and easy to miss |
| Go back to the original file and re-export | Highlight is written into the content of the page, and the annotation method is invalid. | A manuscript is required, and the operation cost is high. |
# frequently asked questions (FAQ)
1. Gaoliang can not be deleted, there is no response after clicking, what is the reason?
In most cases, these colors are part of the content of the page, not comments. You can first try to highlight the text below, if it can be selected but there is no comment box, it is likely to be shading. At this point, you need to go back to the original file and re-export a PDF without highlighting.
2. Can you use the blackening function instead of removing highlights?
This is not recommended. Blackening will permanently cover the content below, the text cannot be restored, and the highlight will not be removed. It is suitable for hiding sensitive information and not for cleaning up tags.
3. How to clear the color mark on the scanned version of PDF?
The color area of the scanned piece is usually an image, and annotation deletion cannot be processed. You can first identify the file by OCR, get the text layer, and then determine what needs to be retained. The recognition results of OCR should be checked item by item, especially the numbers and formulas.
4. Will the original text be affected after the highlight is deleted?
Not under normal circumstances. Highlighting is a mark that covers the top of the text, and deleting it does not change the text. If you find that the text changes during the check, it is probably a misuse of other functions, you should go back to the original and do it again.
5. Can I find the highlight after deletion?
If you save the manuscript in advance, you can reprocess it directly with the manuscript. Therefore, it is a safe habit to keep another copy before deletion.
# Summary
The key to PDF highlight batch deletion is to first determine whether the highlight is annotations or page content, then filter by type, delete multiple selections, and finally check with the comparison function. Keep the original before deletion, so you don't have to worry about not being able to recover after a mistake. By mastering this set of processes, the problem of how to delete pdf text highlights in batches can basically be solved.
