OmniDocWhat are the common document formats and their standards?
What are the formats of the documents? This article sorts out the uses and standards of common formats such as PDF, Word, Excel, PowerPoint, Markdown, EPUB, etc., and provides a judgment method for selecting export formats based on delivery scenarios.
Key points of this article
- To choose a format, first look at the purpose: if you want to fix the layout, choose PDF, if you want to continue editing, choose DOCX, if you want to save data, choose XLSX, and if you want to make a presentation, choose PPTX.
- PDF has long-term archiving subsets such as PDF/A, and DOCX, XLSX, and PPTX are based on the open Office Open XML standard.
- The document table of contents is implemented by title level, bookmarks and outline. Before exporting, make sure that the title style is not lost.
- Format conversion may change the layout, formulas and tables, which should be checked page by page before delivery. Scanned copies should also be checked for text recognition results.
Many people will be asked when submitting, reimbursing or sending to clients: "Send PDF or Word?" The reason behind this is actually a lack of overall understanding of the issue "What are the formats of the document?" Different formats determine whether the file can be modified, whether it is displayed consistently on different devices, whether it can be opened smoothly by others, and whether it is suitable for long-term storage or temporary collaboration.
This article is written for people who need to choose the export format before delivery, such as students writing papers, staff organizing contracts, teachers preparing courseware, and is also suitable for people who are exposed to "document specifications" for the first time. After reading, you will be able to distinguish what common formats are responsible for, know what criteria to select according to, and know where to check after exporting.
What are the document formats and how to choose? One sentence conclusion
Give the conclusion directly: first ask yourself whether this document is to be "read by others" or "changed by others", and then ask about the other party's software environment. To fix the layout and prevent others from modifying it at will, use PDF; to allow the other party to continue editing, use DOCX; to calculate data, use XLSX; to make reports, use PPTX.
| your situation | Recommended practices | reason |
|---|---|---|
| Contracts, certificates, reports are finalized and need to be printed or filed | Export to PDF, selecting PDF/A if necessary | The layout is basically the same on different devices and is more secure for long-term storage. |
| The first draft requires multiple people to revise and backfill comments. | Save as DOCX | Revisions, comments, and styles can all be recognized by office software |
| There are a lot of numbers and formulas to calculate | Save as XLSX | Cells, formulas, and data structures can continue to be used |
| Courseware and reporting materials | Save as PPTX | Pages, animations and notes can be played and modified in the presentation software |
| Technical documents and notes need to be placed in the code warehouse | Use Markdown | Pure text, clear version comparison, and structure expressed by simple symbols |
What do common formats do?
The core of PDF (Portable Document Format) is fixed layout. Fonts, pictures and layout are encapsulated in a file, and the effect you see after opening it is basically consistent with the author's design. PDF is standardized by ISO 32000, of which PDF/A is a subset oriented to long-term archiving, limiting external dependencies and suitable for archiving.
DOCX is a standard format for Word, based on the Office Open XML standard. It retains paragraph styles, heading hierarchies, revisions, and comments, making it suitable for scenarios where you need to continue editing. The old version of DOC is in binary format and its compatibility is not as good as DOCX. It is recommended to use DOCX uniformly for new documents.
XLSX and PPTX correspond to tables and presentations respectively, and are also based on Office Open XML. Their value is that the data and structures can be reused, not just look correct.
Markdown, EPUB, LaTeX are more biased toward specific scenarios. Markdown is a lightweight markup language that uses pound signs to represent titles and dashes to represent lists. It is suitable for writing technical notes and document source code. EPUB is an open e-book format where text can be reflowed to fit the screen size. LaTeX is a commonly used source code format for academic typesetting and has strong expressive ability for mathematical formulas. The common SRT and ASS subtitle files also belong to the same type of "structured text" format.
Document directory format: title hierarchy and bookmarks
Many people search for "document directory format", but they actually want to know how to automatically generate a directory and whether it is still there after exporting. The key is to use styles for titles, rather than just making the font size larger. In Word, the table of contents depends on the heading style; in PDF, it corresponds to bookmarks and outlines; in Markdown, # and ## are used to represent the hierarchy. Check whether the title level is coherent before exporting, and check whether the bookmarks or outline are complete after exporting to avoid table of contents misalignment.
Common Misunderstandings
One misconception is that "PDF is the final version and will never be wrong." In fact, when exporting PDFs from Word, formulas, pagination, and tables may change and must be checked page by page. Another misconception is that "scans can also be used directly as editable documents." The scanned document is essentially an image. To modify text, you first need to perform text recognition (OCR), and the recognition results must also be verified.
📊 Core Comparison
| Format | Main uses | Can you edit directly? | Whether the layout is fixed |
|---|---|---|---|
| Delivery, printing, and archiving | Specialized editing tools are required | Yes | |
| DOCX | Collaboration in text and manuscripts | Yes | No, it varies depending on the device and font |
| XLSX | Data tables, calculations | Yes | No |
| PPTX | Presentation materials | Yes | No |
| Markdown | Technical documentation and notes | Neng (plain text) | No typography involved |
| EPUB | E-book reading | Specialized tools are required | No, rearrangement is possible |
How to actually use it
If you already have a PDF or Word file and want to convert the format according to the recipient's requirements, you can refer to the following steps:
- First, confirm the format required by the recipient. If you can keep editing, you need DOCX; If you only read without editing, you need a PDF.
- When you need editable content from a PDF, you can use the PDF editor in the OmniDoc desktop client (download.omnidoc.top) to export files as Word, Excel, or PowerPoint. Scanned PDFs can be first recognized by OCR before exporting.
- When handling conversion between Word and LaTeX, or editing documents with formulas on web pages, you can use the UniDoc web editor (app.unidoc.top).
- After exporting, check page by page whether the title, table of contents, tables, formulas, and images are complete. Machine conversion and text recognition can both make errors, and content involving contract amounts, dates, and technical terms must be manually verified.
🎯 Which method suits you?
If you only occasionally submit a document, choose PDF for delivery and keep a DOCX original, which basically covers most scenarios. If you often collaborate with your team, it is recommended to use DOCX or UniDoc documents as masters and export the PDF only after finalization. If you're writing technical documents or papers, you can first organize the content using Markdown or LaTeX, then format and output the content.
❓ Frequently Asked Questions (FAQ)
1. Is sending PDF or Word more reliable?
If the other party only needs to read or print, sending PDFs is more reliable and the layout is less likely to be altered. If the recipient needs comments or modifications, they should send a DOCX and specify the modification requirements in the email.
2. How can a scanned PDF become an editable document?
First, check if the file is a scan: try selecting a passage in the reader; if you can't, it's usually just an image. When editing is needed, OCR recognition is performed first, then exported to Word, and finally the recognition results are checked paragraph by paragraph.
3. What is the difference between DOC and DOCX?
DOC is an earlier binary format, while DOCX is based on an open XML structure, resulting in smaller files and better compatibility and maintainability. The new document recommends using DOCX.
4. What should you look for when choosing a free online conversion tool?
Pay attention to four key points: file size limits, whether exported files have watermarks, whether the files will be saved or used for other purposes, and whether the layout and tables are retained. Don't just look at the word "free"; test it with a sample file first.
5. What if the exported table of contents or bookmarks are incomplete?
First, go back to the original file and check if the title uses a unified title style, rather than manually bolding and changing the font size. After correcting the title level and then exporting again, the table of contents or bookmarks usually return to normal.
📝 Summary
There is no unified answer to what document formats are; the key is to consider the purpose and recipient. PDF is responsible for delivery and archiving; DOCX, XLSX, PPTX is responsible for editing and collaboration; Markdown, EPUB, and LaTeX serve specific scenarios. After exporting, the layout, table of contents, and important data are checked page by page to ensure the file is truly delivered reliably to the recipient.
