OmniDocHow to solve the problem of garbled characters and no pictures when converting PDF to PPT?
Garbled characters or missing images after converting PDF to PPT are mostly related to the source file type, fonts and export settings. This article teaches you to first determine where the problem lies, and then troubleshoot and fix it in order from easy to difficult to avoid repeated retries.
Key points of this article
- First use the mouse to drag and select to test whether the PDF has a text layer. If it can be selected, it means it is a text-based PDF. If it is not selected, it is basically a scanned document, and you need to do OCR first.
- Garbled characters are mostly related to fonts not being embedded or character encoding. Changing fonts usually has no effect. You should go back to the original file or re-export the version with embedded fonts.
- Disappearance of images is common in vector images or images embedded in comments or forms. Key images can be saved from the original file and then inserted into PPT.
- The conversion results should be checked page by page for text editability, picture integrity, and page count. The formula and the content recognized by OCR need to be checked against the original text.
When converting PDF to PPT, two common problems are: the text turns into a bunch of incomprehensible symbols, or all the charts and photos on the page disappear, leaving only a white background and scattered text boxes. Many people subconsciously try another online conversion website after encountering it, but the result is still the same. The problem is often not with the tool itself, but with the structure of the source PDF.
This article is written for people who need to convert reports, courseware or paper abstracts into slides. We first classify the problems, then troubleshoot them in order from easy to difficult, and finally explain how to process the source files before conversion to reduce rework. After reading this you should be able to tell whether the problem is with the source PDF, fonts or export settings, and know what to do next.
The following troubleshooting methods also apply to other conversion scenarios, but focus on the PDF editing and export functions of the OmniDoc desktop client.
PDF to PPT is garbled and has no pictures, how to fix it? One sentence conclusion
First determine whether the source PDF is a scan, a text PDF, or a PDF with a special image structure, and then decide whether to do OCR first, process fonts, or return to the source file and re-export it. Retrying directly usually has no effect.
| your situation | Recommended practices | reason |
|---|---|---|
| Scanned document, text cannot be selected | Do OCR recognition first, then export PPT | Without a text layer, the conversion can only result in pictures or garbled characters. |
| Text can be selected, but appears as boxes or garbled characters | Check if fonts are embedded and request a PDF with embedded fonts if necessary | The font is missing or the encoding is not standard, and the characters cannot be correctly mapped when exported. |
| Text is normal, pictures are missing | Confirm that the image can be displayed in the reader, save the key image separately and insert it later | Pictures may be drawn in vector form, or embedded in comments or forms, and will be skipped during export. |
| The whole page is one big picture | Go back to the Word or PPT source file, re-export the PDF, and then convert | The original files have been merged into images when generating PDF, and there is no extractable content in the PDF. |
| Distortion of formulas and special symbols | After exporting, manually retype it against the original text, or insert the formula as an image. | Mathematical symbols have special fonts and are easily aliased when converted. |
First determine what kind of problem it is
Before troubleshooting, take a few minutes to confirm which category the symptoms belong to, which can save you a lot of detours.
| symptoms | Common reasons | How to confirm |
|---|---|---|
| The words are all garbled or question marks. | The font is not embedded, or the character encoding is special | Select a paragraph and copy it to notepad to see if the pasted content is still garbled. |
| The page can only see images and cannot select text. | Scanned piece, no text layer | Drag and select a text with the mouse, and if it is not selected, it will be a scanned piece. |
| Only some of the words are garbled, and the rest are normal. | Missing individual fonts or symbol fonts | Turn to the garbled page and compare it with the normal page to see if it is focused on a certain font, title or formula |
| There is a blank box on the page and the picture is gone. | The picture is a vector picture, or embedded in comments or forms. | The picture can be displayed normally in the reader, but not after conversion, which indicates that it is a problem with the export structure. |
| The text is one word at a time, and the position is disordered. | Multi-column typesetting or complex text box structure | Open PPT to see if there are a large number of text boxes and whether there are a large number of fragments on each page. |
| The chart becomes a non-editable whole picture. | The original chart itself is an image. | Go back to the original file to see if the chart is editable. If it is originally a picture, you can only accept the picture form. |
# item-by-item troubleshooting and repair
Do it in the following order. The first few steps are low-cost and can rule out most common causes.
- first confirm whether the text layer exists. drag and select a text with the mouse and paste it into notepad. The text that can be selected and pasted out is normal, indicating that the text layer exists, and the problem is mostly in the font or export settings; if not, you need to do OCR first.
- OCR the scanned piece first. OCR the scanned PDF in the PDF editing feature of the OmniDoc desktop client, and let the text layer be generated before exporting PPT. Errors may occur in OCR, especially numbers, names and technical terms, which should be checked one by one against the original text after export.
- check whether the font is embedded. Font information can be viewed in the document properties of many readers. If the font is not embedded, or there are a large number of alternative fonts in the list, the file is missing when it is generated on another computer. At this point, it is more reliable to ask the original author for a version with an embedded font than to change the font manually in PPT.
- export in the desktop client and compare it page by page. use the PDF editing feature of the OmniDoc desktop client to export the file to PowerPoint format. After downloading or saving the results, compare the results with the original PDF page by page, and write down which pages are garbled or missing pictures. Usually only individual pages are abnormal, and the problem lies in the layer, font, or special object on that page.
- handle missing images. first zoom in on the reader to make sure that the picture is displayed properly. If the display is normal but not after export, the picture is stored in a special structure. At this point, you can try to organize the page in the PDF editor before exporting; if it is still missing, go back to the original file, save the image as an image format, and then insert it into the corresponding location in PPT.
- formulas and special symbols are handled separately. Mathematical formulas, chemical formulas, Greek letters and other contents are easy to be distorted. It is often faster to retype the content manually after export, or to directly intercept the formula picture and insert it than to adjust the settings repeatedly.
- go back to the source file and redirect it if necessary. * if the PDF is generated by screenshots, photos or multiple conversions, the quality of the text and images has been compromised. At this point, you should retrieve the original Word, PPT, or LaTeX source file, re-export PDF from the source file, and then convert it to PPT. The result is usually more stable.
- do a full check after export. * Open PPT page by page to make sure that the text can be edited, the picture is complete, and the number of pages is the same as the original file, and then send it to others or for reporting.
# how to avoid the next occurrence
- do tests before switching. drag and select a paragraph of text to confirm that the text layer exists. OCR files that are not selected first, do not convert them directly. - preserve text and fonts when exporting PDF. when generating PDF from Word or PPT, choose an embedded font to avoid exporting the whole page as a picture. - Export from the source file is given priority. if the original is still there, the quality of PDF generated from Word or PPT is much higher than that from screenshots or scanned pieces. - complex layout is checked separately. pages with multiple columns and a large number of charts or formulas should be checked first after conversion, instead of just looking at the home page. - keep the source file and treat the conversion result as a draft. PPT is suitable for secondary editing, but numbers, citations and key conclusions still need to be checked with the original. Both OCR recognition and automatic conversion can go wrong, and important contents must be confirmed manually.
# frequently asked questions (FAQ)
1. The converted PPT text is garbled, can it be repaired by changing fonts directly in PPT?
Usually not. Garbled codes are often caused by errors in the correspondence between characters and fonts, and changing fonts will only make the wrong symbols look different. You should first confirm whether the source PDF has a text layer and whether the font is embedded, and return to the source file or OCR if necessary.
2. You can clearly see a picture in PDF, but you don't have it when you convert it to PPT. Why?
Pictures may be drawn in vector form, or embedded in comments, forms, and other structures, and are not extracted as pictures when exported. It is safer to save key pictures from the original file and insert them into PPT.
3. Do you want to OCR the scanned version of PDF to PPT first?
Yes. When there is no text layer, the export result can only be a picture or garbled. Text can only be extracted and edited after OCR, but the recognition results need to be proofread against the original text, especially numbers and technical terms.
4. What should I look at when choosing a free PDF to PPT tool?
You can focus on four items: whether the text can still be edited after export, whether the picture is complete, whether the file size is limited, and whether the result is watermarked. It is recommended that you test with a multi-page sample PDF before deciding whether to use it in an official document.
# Summary
When PDF is converted to PPT, garbled codes or pictures are lost, mostly from the text layer, font or picture structure of the source PDF. It is more effective to determine which type of problem it belongs to and then fix it in the order from easy to difficult. After the conversion is completed, check the text and pictures page by page, and you can rest assured to use them.
