OmniDocReasons and solutions for garbled characters when converting PDF to Word
Garbled characters, boxes, or misaligned text appear after PDF is converted to Word. This is mostly caused by scanned documents, missing fonts, or special symbols. This article determines the cause based on the symptoms, and provides a troubleshooting sequence and repair methods from easy to difficult.
Key points of this article
- First select the text in the original PDF and copy it to Notepad. If you see normal text, it means there is a problem in the conversion process. If you see garbled characters, it is probably a problem with the source file.
- PDFs for which Chinese characters cannot be selected are usually scanned and should be OCR recognized first, and then converted or translated. Direct conversion will only result in images or incorrect text.
- Boxes, question marks and replacement fonts are mostly caused by fonts that are not embedded or missing characters. This can be improved by using a full font version or embedding the font when exporting.
- Commonly used symbol fonts for special characters such as Greek letters and mathematical symbols are easily misplaced after conversion. Manual replacement or rewriting with a formula editor is more reliable.
After converting a PDF to Word, many people have encountered trouble when opening it to see a screen full of boxes, question marks, or Chinese characters turning into incomprehensible characters. Once papers, contracts, and reports are like this, the cost of retyping is very high, and it is easy to miss the content.
This article is for people who have made the switch and are looking for reasons. Rather than just changing to a conversion tool and trying again, it’s better to figure out where the garbled code comes from. The practice of practice varies greatly for different reasons, and prescribing the right medicine can save a lot of time. After reading, you can determine which category your file belongs to, and complete troubleshooting and repair in order.
The following will give the conclusion first, and then explain the reasons and methods one by one.
PDF to Word is garbled, how to deal with it? One sentence conclusion
In most cases, first determine whether the source PDF is a scan or an electronic version, and whether the font is complete, and then decide whether to perform OCR, change fonts, or manually correct it, rather than repeatedly changing the conversion method.
| your situation | Recommended practices | reason |
|---|---|---|
| Chinese characters cannot be selected, and they are blank or garbled after conversion. | Do OCR recognition first, then convert | The text in the scanned document is an image and cannot be read directly by the conversion tool. |
| I can select text, but when I copy it, it’s garbled. | Change to a PDF with complete fonts, or ask the original author to re-export it | The font is not embedded or there is a problem with the encoding mapping, and the source file itself is defective |
| Only individual symbols and formulas are displayed as boxes | Symbols are replaced manually and formulas are rewritten using the editor | Special characters use symbol fonts, which are easily lost during conversion. |
| The text is normal, but the paragraphs are out of order and the tables are disconnected. | Adjust with a PDF editor or rearrange according to the original text | Column, text box and table structures are broken up during conversion |
| The document is important and needs to be translated into another language | Directly upload the scanned copy for translation, choose bilingual comparison or translation only, and then check | The translation process will first recognize the text, eliminating the loss of intermediate conversion. |
First determine what kind of problem it is
Before taking action to fix it, first find out what the symptoms correspond to. The table below can help you locate quickly.
| symptoms | Common causes | How to confirm this |
|---|---|---|
| After conversion, large areas are blank, or only images remain | Scanned or image-type PDF | Try selecting a passage in the original PDF with the mouse; if you can't select it, it's a scanned copy |
| The copied text is garbled, but the screen displays normally | Font not embedded, or abnormal text encoding | Paste the copied content into Notepad and see if all the characters are abnormal |
| Individual characters turn into boxes or question marks | missing characters, or using rare fonts | Check the document properties or font information of the PDF to see if any unembedded fonts are listed |
| Misalignment of Greek letters, arrows, and mathematical symbols | Symbol font mapping is lost | Compare with the original text to see if the misalignments are concentrated on special symbols |
| Chinese is normal, but paragraphs and columns are mixed together | Layout issues caused by columns and text boxes | Switch to page view in Word and see if text boxes and columns are broken up |
| Only some pages are garbled | The same file mixes scanned pages and electronic pages | Select text page by page to find pages that are not selected |
Inspect and fix each item one by one
It is recommended to proceed in order from easy to difficult; many problems can be identified in the first two steps.
- Copy a passage of text to Notepad. Select a passage of text from the original PDF and paste it into your notebook. Normal text can be seen, indicating the source file is available; most issues are in the conversion stage; If all the text is garbled or the selection is incorrect, proceed to the next steps.
- Confirm whether it is a scan. If you select a PDF without Chinese text, it's basically a scan; directly converting it can only result in images or incorrect text. At this point, OCR recognition should be performed first. The PDF editor on the OmniDoc desktop client supports OCR on scanned PDFs, and the web version of OmniDoc can also directly upload scanned copies for translation. After OCR is complete, exporting Word greatly improves text's editability.
- Check for missing fonts. Open the PDF document properties to view font information. If unembedded fonts are listed, the system will use alternative fonts during conversion, making rare characters and special symbols more likely to become boxes. In such cases, you can ask the person providing the document for the full version of the font, or have them choose to embed the font when exporting the PDF.
- Replace special symbols and formulas. Greek letters, mathematical symbols, arrows, etc., usually come from symbolic fonts and are prone to misalignment after conversion. A few symbols can be manually inserted into the correct characters in Word; For many formulas, it's recommended to re-enter them using the formula editor—it's safer than hard editing. OmniDoc's UniDoc web editor supports formula editing and can be converted with Word and LaTeX, making it suitable for handling such content.
- Unify fonts in Word. After conversion, select all main texts and set Chinese and Western fonts as common fonts, for example, SimSun or Heiti correspond to Chinese, while common sans or serif fonts correspond to Spanish. After font unification, some confusions caused by replacement are significantly reduced.
- Adjust layout and columns. If the text is correct but just out of order, you can modify the paragraph text in the PDF editor or manually adjust the text boxes and columns in Word. For documents with complex layouts, it is recommended to verify page by page against the original text; do not expect a complete conversion in one go.
Documents mixed with scanned and electronic versions
Some documents have electronic pages in the first few pages, while the latter pages are scanned attachments or signature pages. For these files, try to split them by page first: convert directly to electronic pages, perform OCR on scanned pages first, and finally merge and check. Mixing them together can easily miss the content of the scanned page.
Font and encoding issues
Font and encoding issues are common in earlier generated PDFs or files exported by specialized software. The standard for judging them is simple: if the text copied from the source PDF is already garbled, no matter how you try to fix it, the conversion tool cannot recover it; you can only go back to the source to change the font version or have the other party re-export it.
How to Prevent It from Happening Next Time
- Embed fonts when exporting PDFs. Choosing to embed fonts when generating PDFs ensures the file displays consistently across different computers and reduces missing characters during conversion.
- Priority given to electronic source files. If you can obtain the original Word or LaTeX original, exporting the PDF directly from the original is more reliable than backtracking from scanned or converted PDFs.
- Conduct a sample inspection before conversion. Select the first page of a 30-page paper and a page containing formulas, convert and test first, and only proceed with the full text after confirming there are no issues.
- Retain the original PDF. Conversion and modification are done on the copy, and if problems arise, you can return to the original file to reprocess.
- Important content must be manually verified. Whether it's OCR or machine translation, recognition and conversion can be mistaken; contract amounts, personal names, data, and formulas should be compared against the original text one by one.
❓ Frequently Asked Questions (FAQ)
1. Can online conversion websites solve the issue of PDF to Word garbled text?
Whether it can be resolved depends on the cause of the garbled text. If it's a scan, what you need is OCR capability; If the font is missing, simple conversion usually does not work. When choosing an online conversion service, check four points: whether there is a file size limit, whether the output has a watermark, whether the uploaded file privacy is explained, and whether fonts and layouts are retained.
2. After converting scanned files to Word, everything is garbled—where did the problem go wrong?
The text in the scanned document is essentially an image, and when converting directly, the tool cannot reliably read it, often resulting in blank spaces or incorrect characters. The correct order is to first OCR recognize text, then export to Word or perform subsequent editing.
3. The copied text is garbled but displays normally on the screen. What should I do?
This usually indicates issues with PDF text encoding or font mapping, and the display is normal simply because the font is rendered in full. The solution is to ask the original author to re-export the PDF and embed the font, or try using another version of the file. Conversion tools themselves are very difficult to fix these root problems.
4. Can the misalignment of mathematical formulas and special symbols be corrected in bulk after conversion?
A small number of symbols can be manually replaced. If there are many formulas, it is recommended to re-enter them using the formula editor or handle them in the UniDoc web editor. Batch replacement can easily damage the main text, so it's not recommended to search and replace the entire text directly.
📝 Summary
Garbled text in PDF to Word mainly comes from three main reasons: scanned copy, missing fonts, and special symbols. First, use copy testing and select-test to determine the type of issue, then proceed with OCR, font check, symbol replacement, and layout adjustment in the order. Most files can be restored to usable status. Important content after conversion still needs to be verified against the original text to ensure the PDF to Word results are accurate and reliable.
