How to convert PDF formulas to Word: Keep the formula format

Key points of this article

First try to select part of the formula in the PDF: it can be highlighted to indicate that there is a text layer, and the formula structure can usually be preserved when converted to Word.
Most of the formulas that cannot be selected or are selected in a box are pictures, and they need to be OCR or formula recognized first, and then pasted into the Word formula editor.
After the transfer is completed, click the formulas one by one to confirm that it is an editable formula object and not a picture.
Fractions, matrices and Greek letters recognized by machines are prone to errors. Key formulas must be checked one by one against the original text.
When choosing a free conversion tool, look for file size limits, watermarks, privacy notices, and whether formulas can continue to be edited after conversion.

When many people write papers, do exercises or organize materials, they only have a PDF in hand, but the formulas in it have to be moved into Word for further editing. The common results of directly copying and pasting are a bunch of garbled characters, broken superscripts and subscripts, or the entire formula becomes a blurry picture. This article talks about the method of converting PDF formulas to Word: first determine what form the formulas are in PDF, then choose the right route, transfer the formulas to Word and try to retain the editable format.

After reading, you will know three things: which step to check first, in which case to use PDF to Word conversion, in which case to do formula recognition; how to check item by item after the conversion is completed. The formula processing steps here are general methods, applicable to most PDFs, and do not depend on a specific tool.

How to choose the method to convert PDF formula to Word? One sentence conclusion

Let me answer in one sentence first: when the formula can be selected, use the PDF to Word route. If the formula is a picture, first identify it, and then put the result into the formula editor of Word.

your situation	Recommended practices	reason
Formulas can be selected with the mouse and copied as characters.	Convert directly to Word and check formula objects after conversion	The formula itself has a text layer, and the structure can usually be preserved during conversion.
The formula cannot be selected, the enlarged version is a picture, and the PDF is a scanned copy.	First OCR recognition, then convert to Word	There is no text layer, so the content can only be restored by recognition.
There are only a few formulas and a lot of text	The entire text is converted to Word, and the formulas are manually rewritten using the formula editor.	Handwriting a small number of formulas is more controllable than overall conversion
There are many formulas, such as large matrices or multi-line derivation	Recognize it as LaTeX code and then import it into Word or online editor	Structured code makes it easy to inspect and modify one by one

Before you start: Confirm these points first

Taking a few minutes to make a judgment before taking action can save you a lot of detours.

Judge whether the formula is text. Try selecting part of the formula in the PDF. If it can be highlighted, it means there is a text layer; if it cannot be selected, or it can only be selected in a box, it is usually a picture. This step determines which route to take later.
See clearly the number of pages and complexity. In a 30-page paper, the formula may be scattered throughout the chapters; in a 12-page contract, the formula may only be found in a few places. When there are many pages and dense formulas, try converting one or two pages first. If the effect is good, then process the entire document.
Back up original files. Both conversion and recognition may change the layout or text. Keep an unprocessed original PDF so you can start over if something goes wrong.
Confirm that formulas can be edited in Word. Word comes with formula editing function. After finishing the conversion, click the formula and it should enter the editing state; if it can only be moved or zoomed as a whole, it is a picture.
Allow time for verification. Both machine conversion and recognition may be subject to error. The numerical values in the examination materials, paper submissions and contracts must be checked one by one against the original text.

Steps to export PDF to Word in OmniDoc

If your PDF formula can be selected, or the document itself has a text layer, you can use OmniDoc's PDF editing function to export it to Word. The following steps are completed in the desktop client, or you can download the client from download.omnidoc.top first.

Download and open the OmniDoc desktop client and import the PDF files you want to process.
Turn to the page containing the formula and first confirm whether the formula can be selected. If it can be selected, continue to the next step; if it cannot be selected, proceed to step 3 first.
If it is a scan, use the OCR function to recognize the text. OCR will turn the page into an editable text layer, and the recognition results require manual inspection.
Modify the paragraph text that needs to be corrected in the PDF editing function. For example, if you identify typos or missing words, you can directly change the paragraph content.
Select Export to Word to save as a .docx file.
Open the exported file in Word and click on one of the formulas to see whether it is an editable formula object or a picture.
For formulas that are still pictures, write down the page number and location, and process them individually as follows.
Check the entire document against the original PDF page by page, and save it as the final version after confirming it is correct.

How to turn picture formula into editable formula? The common method is to first use the formula recognition tool to convert the image into LaTeX code, and then paste the code into the formula editing area of Word. Word can recognize most of these common writing styles, and complex structures may require manual correction. If you need to convert back and forth between Word and LaTeX, or want to edit formulas directly on the web page, you can use the UniDoc web editor (app.unidoc.top), which supports conversion between Word and LaTeX and includes formula editing.

Check each item after completion

Once you have your Word document, don’t rush to submit or share it. Read the following items one by one.

Check items	How to see	What to do if there is a problem
Is the formula editable?	Click on each formula to see if you can enter the editing state	The picture formula is re-inserted using the recognition results, or rewritten manually
Superscript and subscript, fraction, root sign	Compare levels and positions one by one with the original PDF	Correct the structure in the formula editor and pay attention to whether the numerator and denominator are reversed.
Greek letters and special symbols	Check whether α, β, ∑, ∫, etc. become garbled characters or question marks	Re-enter the corresponding symbols, or insert using LaTeX code instead
Formula numbers and references	Whether the numbering is misplaced, and whether the text reference still points to the original formula	Manually adjust the numbering and check references such as "Formula (1)" in the text one by one.
Paragraph and line spacing	Are there extra blank lines before and after the formula? Are long formulas truncated?	Adjust paragraph format and split long formulas into two lines if necessary
Numbers and variables	Are the key values and subscript variables consistent with the original text?	The original text shall prevail for modification; the content recognized by the machine must be manually checked

🎯 Which method is suitable for you?

There are not many formulas in the paper or report: The main text is converted from PDF to Word, and the formulas are rewritten one by one using the Word formula editor, saving worry.
Scanned version of handouts or textbooks: OCR first, then check the text, and finally process the formulas. Most of the errors in this type of file are concentrated in formulas and symbols, so sufficient time should be reserved for checking.
Mathematical or engineering documents with dense formulas: Prioritize identification as LaTeX, centrally manage formulas, and make modifications clearer than clicking one by one.

❓ Frequently Asked Questions (FAQ)

1. Can I use free tools to convert AI formulas into word?

Whether it is free or not depends on the specific conditions. When selecting, look at file size and page limits, whether watermarks are added, whether the privacy statement states how the file will be processed, and whether the formula can continue to be edited after conversion. If all of these are satisfied, then decide which one to use.

2. Will the format be lost when using the online conversion website to convert PDF formula?

Probably. Common problems are that formulas become pictures, superscripts and subscripts are misplaced, or symbols are missing. It is recommended to test with one or two pages first, click on the formula to check whether it is editable, and confirm that there is no problem before processing the entire document.

3. Can the content identified by the formula be trusted directly?

Can't quite believe it. Recognition is done by machines, and fractions, matrices, Greek letters, and superscripts are prone to errors. Important contents should be checked one by one against the original text, especially numerical values and variable names.

4. Why can’t I click on the formula in Word and can it only be used as a picture?

Usually the formulas are exported as pictures during conversion, or the formulas in the original PDF themselves are pictures. Identify these formulas according to the above method, and then re-insert them into Word's formula editor.

📝 Summary

The key to converting PDF formulas to Word is to first determine whether the formula can be selected: if it can be selected, convert it directly; if it is a picture, first identify and then rewrite it. After the conversion is completed, check whether the formulas are editable one by one, and whether the symbols and values are consistent with the original text, and you will get a Word document that retains the formula format.

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