OmniDocEdit Text and Images in a PDF
Learn how to edit PDF text and images, when a scanned page needs OCR first, and how to check the result on Windows, macOS or Linux.
You have a PDF with a wrong date in a paragraph, an outdated logo on the cover, or a scanned page where a figure number is off by one. PDFs are built to look the same on every screen, not to be edited, so changing them takes a different approach than changing a Word file. The first question is whether the text is real text or a picture of text.
This guide shows how to edit PDF text and images with the OmniDoc desktop client, which runs on Windows, macOS and Linux. It covers when a scanned page must go through OCR before you can edit its words, how to handle pictures that the editor cannot replace directly, and how to check the finished file. If you searched for a way to edit image text in a PDF on a Mac, the same steps apply, and the section on scanned pages explains why it often fails without OCR.
How do you edit PDF text and images? The short answer
Check whether the text is selectable first. If it is, edit the paragraph in the PDF editor. If it is a scanned picture, run OCR, then edit. For pictures themselves, the editor does not replace them directly, so change the source file and export again, or swap in a corrected page.
| Your situation | What to do | Why |
|---|---|---|
| A typo in a digital PDF's paragraph | Edit the paragraph text in place in the PDF editor | The text is stored as real characters, so the words can be changed directly |
| A scanned page where the text is only a picture | Run OCR on the page, then edit the recognized text | A scan stores letters as an image, so there is nothing to edit until OCR recognizes them |
| A logo, chart or photo needs replacing | Edit the source file and export a new PDF, or replace the whole page | The PDF editor's listed features cover text, pages and redaction, not swapping pictures |
| Sensitive text must disappear | Redact the area | Redaction removes the content from the file; a black box drawn on top does not |
Before you start
- Check whether the text is live. Select a line of text with your cursor. If the selection highlights only the words, the text is editable. If the whole page is one image or nothing highlights, it is a scan and needs OCR. This check takes ten seconds and decides the whole workflow.
- Save an untouched copy. Edits change the file you save, so keep the original under a different name. You will need it to compare line breaks and figures after editing.
- Look for the source file. If the PDF came from Word or PowerPoint, the source is the easiest place to fix a picture or a long paragraph. Re-exporting from the source also avoids stacking small patches on a file.
- Install the desktop client. The PDF editor is part of the OmniDoc desktop client. Download it from download.omnidoc.top and install it for your operating system. The PDF editing steps below assume the desktop client is open.
- Plan for font differences. If the font used in a paragraph is not installed on your computer, a replacement may look slightly different. Compare the edited line with the lines around it before you save.
Editing PDF text and images in OmniDoc, step by step
- Open the PDF in the desktop client. Start the client, then open the file. Work on a copy so the original stays unchanged.
- Test whether the text is live. Select a line on each page type you need to change. If the text highlights, go to step 4. If it does not, go to step 3.
- Run OCR on the scanned pages. Use the OCR feature on the pages that contain the picture-only text. OCR recognizes the letters and makes them editable, but it is machine recognition, so the output needs checking, especially for names, numbers and small type.
- Edit paragraph text in place. Open the PDF editor, select the paragraph, and change the words. Keep the new text close in length to the original. Long additions push into the margin or onto a new line and can break the layout around them.
- Handle pictures by changing the source or the page. The PDF editor's listed features do not include replacing or moving pictures. Two routes work well:Fix the picture in the original Word or PowerPoint file, then export a new PDF and use it in place of the old one.; Create a corrected single page in another file, insert it with the page operations, then delete the old page. Reorder pages if the new one lands in the wrong spot.
- Redact anything that must disappear. Use redaction on text or areas that should not appear in the shared file, such as an account number. Redaction removes the content, so it is safer than drawing a shape over the text.
- Export a copy if you need to check the content. The editor can export to Word, Excel or PowerPoint. Use an export to read the text in another program, then go back to the PDF for final changes. Keep the PDF as your delivery format unless you need an editable version.
- Save under a new name and review. Save the edited file as a separate version, then run the checks below before sending it.
Check the result
Open the edited PDF at normal zoom and go through each change. Use the table to find problems and fix them.
| Check | How to see it | If it's wrong |
|---|---|---|
| Edited paragraph | Look at line breaks and spacing against neighboring paragraphs | Shorten the new text, or undo and edit again with fewer words |
| OCR accuracy | Compare names, dates and figures with the original scan | Correct the characters in the editor, then compare again |
| Old picture still visible | Scroll through the page where the picture appeared | Replace the page or re-export from the source file |
| Redacted content | Try selecting the redacted area and copying text | If text can still be selected, redo the redaction and check again |
| Font match | Compare the edited words with nearby text | Use the same font where possible, or accept a small difference for a short fix |
If OCR was used, read important content in full against the original. OCR and machine translation can misread characters, so do not rely on a single pass for contracts, figures or medical details.
❓ FAQ
1. Can I edit an image inside a PDF directly?
The PDF editor's listed features cover text, forms, signatures, redaction, page operations and OCR, but not replacing a picture in place. The practical route is to fix the image in the source file and export a new PDF, or to swap in a corrected page.
2. Why can't I select the text in my PDF?
The page is most likely a scan, meaning the letters are stored as a picture. Run OCR on those pages, then check the recognized text against the original before you edit it.
3. Does this work on a Mac?
Yes. The OmniDoc desktop client runs on macOS as well as Windows and Linux. The same check for selectable text and the same OCR step apply on a Mac.
4. Can I edit a PDF without installing anything?
The PDF editing tools are in the desktop client. The web editor at app.unidoc.top works with Word-compatible documents, so if you still have the original Word file, you can make the change there and create a new PDF from it with the program you normally use.
5. Will OCR keep my table and layout the same?
Not always. Check tables, columns and line order after OCR, because recognized text can come out in a different sequence than the original page. If the layout is critical, compare it closely with the source before you rely on it.
📝 Summary
Digital text can be edited directly in the PDF editor, while scanned text must go through OCR first. Pictures usually need a change to the source file or a replacement page, not a direct swap. Check each edit against your untouched copy before you share the file.
