UOP File (.uop): What It Is, How It Works + Sample Files

The basics

What is a UOP file?

A UOP file is a slide presentation saved in the Uniform Office Format (UOF), China's national standard for office documents. UOF was developed by the Chinese Office Software Work Group with domestic office suite makers and published as GB/T 20916-2007, "Specification for the Chinese office file format", in April 2007. It covers text documents (.uot), spreadsheets (.uos) and presentations (.uop) with one shared design.

The format's most visible trait is its language: element and attribute names are Chinese, such as 演:幻灯片 for a slide and 字:段落 for a paragraph. Like OpenDocument and Office Open XML, it is an open XML format, and around 2007 there was public discussion of harmonising UOF with ODF. The two never merged, and they make different design choices, as the anatomy shows.

You're most likely to meet UOP files in Chinese government or education settings, or when testing a converter's coverage of rarer formats.

Anatomy

What's inside a UOP file

A UOP from LibreOffice is not a ZIP: open it in any text editor and you see the whole presentation as one XML document. This is our sample-minimal.uop, one slide with one title, in outline. LibreOffice writes every style it knows, so even this file is about 145 KB.

sample-minimal.uop (outline)

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<uof:UOF xmlns:uof="http://schemas.uof.org/cn/2003/uof"
    xmlns:图="http://schemas.uof.org/cn/2003/graph"
    xmlns:字="http://schemas.uof.org/cn/2003/uof-wordproc"
    xmlns:演="http://schemas.uof.org/cn/2003/uof-slideshow"
    xmlns:表="http://schemas.uof.org/cn/2003/uof-spreadsheet"
    uof:language="cn" uof:version="1.0" uof:mimetype="vnd.uof.presentation">
  <uof:元数据>                                  (metadata)
    <uof:标题>Minimal UOF presentation</uof:标题>
    <uof:作者>99helpers.com</uof:作者> …
  </uof:元数据>
  <uof:对象集>                                  (object set: 25 objects)
    <图:图形 图:标识符="pr4_0">
      <图:预定义图形><图:名称>文本框</图:名称> …</图:预定义图形>
      <图:文本内容>
        <字:段落><字:句><字:文本串>Hello, UOF</字:文本串></字:句></字:段落>
      </图:文本内容>
    </图:图形> …
  </uof:对象集>
  <uof:式样集> … fonts, numbering, 91 style entries … </uof:式样集>
  <uof:演示文稿>                                (presentation)
    <演:公用处理规则> page setup, colour schemes, layouts, show settings </演:公用处理规则>
    <演:主体>
      <演:母版集> handout, slide and notes masters </演:母版集>
      <演:幻灯片集>
        <演:幻灯片 演:名称="page1" 演:母版引用="Default" 演:页面版式引用="AL1T19">
          <uof:锚点 uof:x坐标="1.4" uof:y坐标="5.8" uof:宽度="25.2" uof:高度="3"
              uof:图形引用="pr4_0" uof:占位符="title"/>
          <演:幻灯片备注> … </演:幻灯片备注>
          <演:切换 演:效果="none" 演:速度="fast"> … </演:切换>
        </演:幻灯片>
      </演:幻灯片集>
    </演:主体>
  </uof:演示文稿>
</uof:UOF>

1<uof:UOF … uof:mimetype="vnd.uof.presentation">
The root
Every UOF document has a uof:UOF root. uof:mimetype says which kind it is (vnd.uof.text, vnd.uof.spreadsheet or vnd.uof.presentation); uof:version is 1.0.
2xmlns:演=… xmlns:图=… xmlns:字=…
Chinese namespace prefixes
演 (presentation), 图 (graphics), 字 (word processing) and 表 (spreadsheet). XML allows any Unicode letters in names, so the tags read naturally to Chinese users.
3<uof:元数据>
Metadata
Title, subject, author, creation date, the creating application and statistics. The equivalent of ODF's meta.xml, inside the same file.
4<uof:对象集>
The object set
Every drawing object in the presentation, each with an ID (图:标识符). Text boxes are objects too: this one holds the title, "Hello, UOF", as a paragraph (字:段落) of runs (字:句).
5<uof:式样集>
The style set
Fonts, numbering and the paragraph and character styles shared by all three UOF document types.
6<演:公用处理规则>
Shared rules
Page setup, colour schemes, slide layouts and slide show settings such as looping and full screen.
7<演:母版集>
Masters
Separate masters for slides, handouts and notes pages.
8<uof:锚点 … uof:图形引用="pr4_0">
Slides point to objects
A slide doesn't contain its shapes. It places them with anchors (uof:锚点) that give the position and size and refer to an object by ID. In an ODP the shapes sit inside the slide.

Versions

UOF 1.0, 2.0 and what LibreOffice supports

UOF 1.0 is the version of the 2007 standard. LibreOffice reads and writes it with XSLT stylesheets that translate between UOF and ODF, a filter first added to OpenOffice.org in 2006. It writes the whole document as one XML file; a 2014 message on the LibreOffice developers' list calls it a flat XML implementation.
UOF 2.0 is a later revision worked out by Chinese vendors. LibreOffice's filter doesn't handle it; WPS Office says it supports UOF, including 2.0.
The LibreOffice filter is old. A 2014 message to the LibreOffice developers' list noted that it covers only part of UOF 1.0 and doesn't handle current documents. It still ships in LibreOffice 24.2, which is how we made our samples.

Test the round trip

We built our sample deck in Impress, saved it as UOP and opened the UOP again. Text, slides, notes and the arrow came back, but the two boxes on slide 3 lost their rounded corners and their centred bold labels, the fade transitions became 演:效果="none", the keywords were left empty, and the second-level bullet changed shape. Compare sample-presentation.uop with sample-presentation.odp to see it yourself.

Comparison

UOP vs ODP vs PPTX

	UOP (UOF 1.0)	ODP	PPTX
Standard	GB/T 20916-2007 (China)	OASIS ODF; ISO/IEC 26300	ECMA-376; ISO/IEC 29500
Container	One XML file (as LibreOffice writes it)	ZIP of XML files	ZIP of XML parts
Tag names	Chinese	English	English
Where shapes live	In a shared object set; slides anchor them by ID	Inside each slide in `content.xml`	In one XML part per slide
Our 3-slide sample	204,509 bytes	18,247 bytes

The size difference in the last row is mostly compression: an ODP is a ZIP package, while LibreOffice's UOP is uncompressed text that also spells out every style. Compressed with gzip, a UOP of the same deck came to about 8 KB.

How to

How to open and convert a UOP file

LibreOffice Impress (free; Windows, macOS, Linux) opens UOF 1.0 presentations; choose File, Open and pick the .uop file.
WPS Office and other Chinese office suites support UOF; check which version a given program reads.
Microsoft PowerPoint doesn't open UOP files. Convert in LibreOffice first.
Convert from the command line: soffice --headless --convert-to odp deck.uop (or pptx, or pdf).
Save as UOP: in LibreOffice, File, Save As and choose Unified Office Format presentation, or soffice --headless --convert-to 'uop:UOF presentation' deck.odp.
In a browser: a browser would show a UOP as raw XML at best, so a link to one is downloaded. Export a PDF to share the slides.

Troubleshooting

Common UOP problems and how to fix them

LibreOffice opens it as text or refuses it. It may be a UOF 2.0 file or come from software that writes a different variant. Try the program that made it, or WPS Office, and export to PPTX or ODP from there.
Formatting changed after opening. The UOF filter covers only part of the format. Expect rounded corners, text alignment in shapes, transitions and some bullet styles to change.
The file is huge. LibreOffice writes uncompressed XML with every style in it. Zip it for storage or email, or convert to ODP.
Chinese text shows as boxes. The font isn't installed. Install a font with Chinese characters, such as Noto Sans CJK, and open the file again.
My XML tool chokes on the tag names. They're valid XML; the tool or its encoding settings must handle UTF-8 names, not only UTF-8 text.

Security

Is a UOP file safe to open?

A UOP from LibreOffice is a single XML file, so the main risks are those of any XML input. Programs that parse it should, like any XML parser facing untrusted files, refuse external entities and limit entity expansion, which blocks XXE and "billion laughs" attacks.

Metadata in uof:元数据 includes the author, dates and the application that wrote the file.
Speaker notes are stored in the file and survive conversion. Check them before sharing.

Free downloads

Sample UOP files to download

Free sample Uniform Office Format presentations for testing file-type detection, converters and Chinese text handling. Both decks were built in LibreOffice Impress 24.2 and saved with its UOF presentation filter; the source deck is included as ODP for comparison. Each UOP was checked as well-formed XML with a uof:UOF root and opened again in LibreOffice, with the right slide count, by exporting it to PDF. Everything in them is fictional.

sample-presentation.uop · 199.7 KBDownload

Browsers can't show this kind of file in a page. Download it to open it in the app it belongs to.

What's inside sample-presentation.uop

Browsers can't preview UOP files as slides, so download it and open it in LibreOffice Impress, or in a text editor to read the XML. These are the parts to look for.

Three slides
Three 演:幻灯片 elements in 演:幻灯片集: a title slide, a bullet slide and a slide with shapes.
English and Chinese text
The title slide's subtitle has 示例演示文稿 (sample presentation) above the 99helpers line, in 字:文本串 text runs.
Bullets on two levels
Five paragraphs in an outline text box, the last one indented a level.
Shapes and an arrow
Slide 3 anchors two filled rectangles and a line with an arrowhead, each a 图:图形 object in the object set.
Speaker notes
Each slide has a 演:幻灯片备注 element with a note, such as "Bullets are paragraphs (字:段落) inside a text box object."
Transitions
The source deck fades between slides; the UOP stores 演:切换演:效果="none", so the filter dropped them.
Metadata
Title, subject, author and the description "… Free sample from 99helpers.com/file-types/uop" in uof:元数据.

All sample UOP files

Three-slide UOP presentation
sample-presentation.uop · 199.7 KB (204,509 bytes)
A 16:9 deck with a title slide in English and Chinese, two levels of bullets, shapes with an arrow and speaker notes on every slide, saved by LibreOffice's UOF 1.0 filter.
- Testing UOP import and conversion to ODP, PPTX or PDF
- Checking XML tools with Chinese element names
Download
The source deck as an ODP
sample-presentation.odp · 17.8 KB (18,247 bytes)
The Impress deck the UOP was saved from. Open both to see what the UOF round trip changes: rounded corners, box labels, transitions and a bullet shape.
- Comparing UOF with ODF
- Measuring conversion fidelity
Download
One-slide UOP
sample-minimal.uop · 144.4 KB (147,858 bytes)
One slide with one title, "Hello, UOF". It's the file shown in the anatomy above, and shows how much the filter writes even for an almost empty deck.
- Quick format detection tests
- Seeing UOF's overall structure without slide content
Download

Ways to test with them

File type detection: both UOP files start with <?xml and have a uof:UOF root with uof:mimetype="vnd.uof.presentation". A detector that only sees "XML" (as the Unix file command does) needs to read the root element.
Conversion fidelity: convert sample-presentation.uop and sample-presentation.odp to PDF and compare slide 3. The differences are the UOF filter's losses, not your converter's.
Unicode names: load the UOP files with your XML parser or XPath tool and select //演:幻灯片 with the 演 prefix bound to http://schemas.uof.org/cn/2003/uof-slideshow. You should get 3 slides and 1 slide.
Upload and size limits: at about 200 KB and 145 KB of plain text, the files compress well. Check that your upload path doesn't reject .uop or sniff it as a generic XML file.

Free to use for testing, teaching and demos, commercially or not, with no attribution needed. A link back to this page is always appreciated.

Put it online

Have a UOP file? Give it a link.

Drop a Uniform Office Format presentation on 99helpers and it gets its own link. Browsers can't show UOP files as slides, so visitors download it and open it in LibreOffice Impress or WPS Office.

Put a UOP file online

Questions

UOP files, frequently asked

What is a UOP file?

A presentation in the Uniform Office Format (UOF), the Chinese office document standard GB/T 20916-2007. It's XML with Chinese element names.

How do I open a UOP file?

With LibreOffice Impress, which reads UOF 1.0 presentations, or with a Chinese office suite such as WPS Office that supports UOF.

Can PowerPoint open UOP files?

No. Open the file in LibreOffice and save it as PPTX, or run soffice --headless --convert-to pptx file.uop.

What's the difference between UOP and ODP?

Both are open XML formats for presentations. ODP is a ZIP package with English tag names; a UOP from LibreOffice is one XML file with Chinese tag names, and it keeps shapes in a shared object set that slides point to.

What standard is UOF?

GB/T 20916-2007, "Specification for the Chinese office file format", issued on 30 April 2007 and in force from 1 September 2007.

What are UOT and UOS files?

The text and spreadsheet members of the same family. LibreOffice opens them in Writer and Calc.

Why is my UOP file so large?

LibreOffice writes it as uncompressed XML with every style included. Zip it, or convert to ODP, which is compressed.

Related formats

Other file types explained

ODP file PPTX file PPT file SXI file OTP file XML file All file types

Keep going

Host a UOP file

Put a UOF presentation online at its own address.

Share a UOP file

Send a presentation as a link instead of an attachment.

Host a presentation

Publish a converted deck people can view from a link.

Sources

Last reviewed 27 October 2026.