# Determine the Original Presentation Format on Android > Read the original format of a loaded presentation on Android with Aspose.Slides for Android via Java, compare detection APIs, and handle files, streams, and legacy formats. Source: https://docs.aspose.com/slides/androidjava/detect-presentation-source-format/ Updated: 2026-09-22 ## **Overview** After loading a presentation, call the [Presentation.getSourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/presentation/#getSourceFormat--) method to determine its original format. The method is also available through [IPresentation.getSourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/ipresentation/#getSourceFormat--). Use it when subsequent processing depends on the format from which the current instance was loaded. The source format is distinct from the [SaveFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/saveformat/) selected for an output file. Saving to another format does not change the source format of the existing instance. The examples use Java and file paths. On Android, replace the sample paths with paths in app-accessible storage, such as your app's internal files directory. ## **Read the Source Format of a File** This example requires an existing `sample.pptx` file. It loads the file and selects an application processing policy using [Presentation.getSourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/presentation/#getSourceFormat--), rather than the filename. Change the input path to try other formats. The example prints the selected policy; replace the messages with your application logic. ```java import com.aspose.slides.Presentation; import com.aspose.slides.SourceFormat; Presentation presentation = new Presentation("sample.pptx"); try { switch (presentation.getSourceFormat()) { case SourceFormat.Ppt: case SourceFormat.Pps: case SourceFormat.Pot: System.out.println("Use the legacy PowerPoint processing policy."); break; case SourceFormat.Pptx: System.out.println("Use the standard PPTX processing policy."); break; default: System.out.println("Use the general policy for source format " + presentation.getSourceFormat() + "."); break; } } finally { presentation.dispose(); } ``` ## **Recognize the Supported Values** The [SourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/sourceformat/) class defines integer constants that distinguish the following presentation formats. The extensions below are conventional extensions, not a reconstruction of the original filename. | SourceFormat value | Extension | Format | | --- | --- | --- | | `Ppt` | `.ppt` | PowerPoint 97–2003 presentation | | `Pptx` | `.pptx` | Office Open XML presentation | | `Pptm` | `.pptm` | Macro-enabled Office Open XML presentation | | `Pps` | `.pps` | PowerPoint 97–2003 slide show | | `Ppsx` | `.ppsx` | Office Open XML slide show | | `Ppsm` | `.ppsm` | Macro-enabled Office Open XML slide show | | `Pot` | `.pot` | PowerPoint 97–2003 template | | `Potx` | `.potx` | Office Open XML template | | `Potm` | `.potm` | Macro-enabled Office Open XML template | | `Odp` | `.odp` | OpenDocument presentation | | `Otp` | `.otp` | OpenDocument presentation template | | `Fodp` | `.fodp` | Flat XML ODF presentation | | `Xml` | `.xml` | PowerPoint XML presentation | ## **Read the Source Format of a Stream** This example requires an existing `sample.pps` file. Reading its bytes into a memory stream models input received without a filename, such as a database value or an uploaded byte array. The [Presentation](https://reference.aspose.com/slides/androidjava/com.aspose.slides/presentation/) constructor receives only the stream. ```java import com.aspose.slides.Presentation; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; try { byte[] bytes; try (FileInputStream input = new FileInputStream("sample.pps"); ByteArrayOutputStream output = new ByteArrayOutputStream()) { byte[] buffer = new byte[8192]; int bytesRead; while ((bytesRead = input.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } bytes = output.toByteArray(); } try (ByteArrayInputStream stream = new ByteArrayInputStream(bytes)) { Presentation presentation = new Presentation(stream); try { System.out.println("Source format: " + presentation.getSourceFormat()); } finally { presentation.dispose(); } } } catch (IOException exception) { System.err.println("Cannot read the presentation: " + exception.getMessage()); } ``` PPT, PPS, and POT use the same underlying binary format. When loading by file path, the extension can help distinguish a slide show or template. Without a filename, legacy PPS and POT content may be reported as `SourceFormat.Ppt`; the PPS example above prints the integer value of `SourceFormat.Ppt`. If your application must preserve the distinction, keep the original filename or subtype metadata separately. An extension is a useful hint for these legacy subtypes, but should not be the only basis for identifying arbitrary presentation content. ## **Compare Detection Before and After Loading** Use [PresentationFactory.getPresentationInfo](https://reference.aspose.com/slides/androidjava/com.aspose.slides/presentationfactory/#getPresentationInfo-java.lang.String-) and [IPresentationInfo.getLoadFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/ipresentationinfo/#getLoadFormat--) when you need to inspect a file before loading its complete presentation object model. Use [Presentation.getSourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/presentation/#getSourceFormat--) when the instance already exists. This example requires `sample.pptx` and prints the integer values of `LoadFormat.Pptx` and `SourceFormat.Pptx`, respectively. In production, choose the API appropriate to your processing stage; an already loaded presentation does not need a second inspection solely to obtain its source format. ```java import com.aspose.slides.Presentation; import com.aspose.slides.IPresentationInfo; import com.aspose.slides.PresentationFactory; String path = "sample.pptx"; IPresentationInfo information = PresentationFactory.getInstance().getPresentationInfo(path); System.out.println("Before loading: " + information.getLoadFormat()); Presentation presentation = new Presentation(path); try { System.out.println("After loading: " + presentation.getSourceFormat()); } finally { presentation.dispose(); } ``` The results use constants from different classes: [LoadFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/loadformat/) and [SourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/sourceformat/). Do not compare their numeric values or assume that every format has identical detection results. PowerPoint XML can be reported as `LoadFormat.Unknown` before loading and `SourceFormat.Xml` after loading. ## **Keep Source and Output Formats Separate** This example requires `sample.pptx` and writes `converted.odp`. It prints the integer value of `SourceFormat.Pptx` both before and after saving the original instance. Only the new instance loaded from the ODP output reports `Odp`. ```java import com.aspose.slides.Presentation; import com.aspose.slides.SaveFormat; Presentation presentation = new Presentation("sample.pptx"); try { System.out.println("Before saving: " + presentation.getSourceFormat()); presentation.save("converted.odp", SaveFormat.Odp); System.out.println("After saving: " + presentation.getSourceFormat()); Presentation reopened = new Presentation("converted.odp"); try { System.out.println("Reopened output: " + reopened.getSourceFormat()); } finally { reopened.dispose(); } } finally { presentation.dispose(); } ``` A presentation created from scratch with `new Presentation()` reports `SourceFormat.Pptx`. It has no input file: this is the default value for a newly created instance, not evidence that a PPTX file was loaded. Track whether your application created or loaded the instance separately if that distinction matters. ## **Map a Source Format to an Extension** The following example requires `sample.pptx`. It maps every currently supported [SourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/sourceformat/) value to a conventional extension, without parsing the input filename. The fallback avoids silently assigning an extension to an unrecognized value. ```java import com.aspose.slides.Presentation; import com.aspose.slides.SourceFormat; Presentation presentation = new Presentation("sample.pptx"); try { String extension; switch (presentation.getSourceFormat()) { case SourceFormat.Ppt: extension = ".ppt"; break; case SourceFormat.Pptx: extension = ".pptx"; break; case SourceFormat.Pptm: extension = ".pptm"; break; case SourceFormat.Pps: extension = ".pps"; break; case SourceFormat.Ppsx: extension = ".ppsx"; break; case SourceFormat.Ppsm: extension = ".ppsm"; break; case SourceFormat.Pot: extension = ".pot"; break; case SourceFormat.Potx: extension = ".potx"; break; case SourceFormat.Potm: extension = ".potm"; break; case SourceFormat.Odp: extension = ".odp"; break; case SourceFormat.Otp: extension = ".otp"; break; case SourceFormat.Fodp: extension = ".fodp"; break; case SourceFormat.Xml: extension = ".xml"; break; default: extension = null; break; } System.out.println(extension != null ? extension : "No extension mapping is available."); } finally { presentation.dispose(); } ``` This mapping does not convert a file or recover a legacy PPS/POT subtype lost during stream loading. For actual saving, select a [SaveFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/saveformat/) explicitly, or use the conversion shown in [Save Presentations in Their Original Format](/slides/androidjava/save-presentation/#save-presentations-in-their-original-format). ## **Verify Formats by Saving and Reopening** This self-contained example creates a presentation and writes three files in the working directory, overwriting files with the same names. It reopens each output both by path and through a memory stream. For PPTX and ODP, both routes report the saved format. For PPS, loading by path reports `Pps`, while loading the same bytes without a filename reports `Ppt`. ```java import com.aspose.slides.Presentation; import com.aspose.slides.SaveFormat; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; Presentation presentation = new Presentation(); try { int[] formats = { SaveFormat.Pptx, SaveFormat.Odp, SaveFormat.Pps }; String[] extensions = { "pptx", "odp", "pps" }; for (int i = 0; i < formats.length; i++) { String path = "roundtrip." + extensions[i]; presentation.save(path, formats[i]); Presentation fromFile = new Presentation(path); try { byte[] bytes; try (FileInputStream input = new FileInputStream(path); ByteArrayOutputStream output = new ByteArrayOutputStream()) { byte[] buffer = new byte[8192]; int bytesRead; while ((bytesRead = input.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } bytes = output.toByteArray(); } try (ByteArrayInputStream stream = new ByteArrayInputStream(bytes)) { Presentation fromStream = new Presentation(stream); try { System.out.println(extensions[i] + ": file=" + fromFile.getSourceFormat() + ", stream=" + fromStream.getSourceFormat()); } finally { fromStream.dispose(); } } } finally { fromFile.dispose(); } } } catch (IOException exception) { System.err.println("Cannot read a saved presentation: " + exception.getMessage()); } finally { presentation.dispose(); } ``` The following table summarizes source-format identification for presentations with matching extensions. Names denote constants; the Java examples print their integer values: | Saved format | SourceFormat from a file path | SourceFormat from a nameless stream | | --- | --- | --- | | PPT | `Ppt` | `Ppt` | | PPTX, PPTM | `Pptx`, `Pptm` respectively | Same as file path | | PPS | `Pps` | `Ppt` | | PPSX, PPSM | `Ppsx`, `Ppsm` respectively | Same as file path | | POT | `Pot` | `Ppt` | | POTX, POTM | `Potx`, `Potm` respectively | Same as file path | | ODP, OTP | `Odp`, `Otp` respectively | Same as file path | | FODP | `Fodp` | `Fodp` | | PowerPoint XML | `Xml` | `Xml` | PPS/POT content is identified as `Ppt` for nameless streams. The table describes format identification, not preservation of every presentation feature during conversion. ## **FAQ** **Does saving to ODP change the source format of a presentation loaded from PPTX?** No. The existing instance still reports `Pptx`. An instance loaded from the saved ODP file reports `Odp`. **Can a stream always distinguish a legacy presentation, slide show, and template?** No. PPT, PPS, and POT share the binary format. Keep filename or subtype metadata separately when that distinction is required. **Which API should I use if the presentation is already loaded?** Read [Presentation.getSourceFormat](https://reference.aspose.com/slides/androidjava/com.aspose.slides/presentation/#getSourceFormat--). Use [PresentationFactory.getPresentationInfo](https://reference.aspose.com/slides/androidjava/com.aspose.slides/presentationfactory/#getPresentationInfo-java.lang.String-) for inspection before loading.