20 MB PPTX sample
A PPTX file of exactly 20,971,520 bytes. It is a valid PowerPoint presentation (Office Open XML) file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 20 MB sample, test or dummy PPTX file.
Download
sample-pptx-20mb.pptx
20 MB20,971,520 bytes
Download 20 MB PPTXCreated in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.
- Type
- application/vnd.openxmlformats-officedocument.presentationml.presentation
- SHA-256
e2bdb7d45ed7425fe067708fa39907c9bc1c74157fa6e8f33b70263535b3ec4a- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
A five-slide deck with a title slide, bullets, a table and speaker notes, plus one embedded test-card PNG of 20,936,854 bytes, stored uncompressed and sized so that the presentation is exactly 20,971,520 bytes. Padding of 11,496,870 bytes in a private ancillary PNG chunk ("spAd", skipped by decoders) inside the image makes up the rest.
| Slides | 5 |
|---|---|
| Contents | Title, bullet, picture and table slides, with speaker notes |
| Embedded image | PNG, 2,048 × 1,536 px |
| Macros | None |
| Container | ZIP (Office Open XML) |
First bytes of the file
The first 64 bytes of sample-pptx-20mb.pptx as a hex dump: offset, bytes, then the same bytes as text. The PPTX signature is 50 4B 03 04.
00000000 50 4b 03 04 14 00 00 00 08 00 00 00 21 5c 20 37 |PK..........!\ 7|
00000010 1d 4f fa 01 00 00 8b 10 00 00 13 00 00 00 5b 43 |.O............[C|
00000020 6f 6e 74 65 6e 74 5f 54 79 70 65 73 5d 2e 78 6d |ontent_Types].xm|
00000030 6c cd 98 4d 6f 9b 40 10 86 ef fd 15 88 0b 87 ca |l..Mo.@.........|Preview
PPTX files cannot be shown in a browser. Download the file and open it in an application that reads PPTX, such as Microsoft PowerPoint.
Where 20 MB matters
A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Microsoft Outlook | 20 MB of attachments by default for internet mail accounts | This file is right at the limit; add a second attachment and it is exceeded. |
| Gmail | 25 MB per message | Under the limit, although email encoding adds about a third in transit. |
| GitHub web uploads | 25 MiB per file added through the browser | Accepted. Pushing with Git allows larger files. |
| Cloudflare Pages assets | 25 MiB per file | The largest round size that can be served as a static asset. |
| Amazon API Gateway | 10 MB payload | Rejected; the upload has to go directly to object storage. |
| ASP.NET Core (Kestrel) | About 28.6 MB request body by default | Accepted with room for the multipart overhead. |
Use this file for
- Measuring download speed from your own server or CDN
- Verifying size limits with media-heavy files
- Testing presentation uploads in learning and meeting software
Testing notes for PPTX
- Converters differ in font substitution; the same deck can reflow when a font is missing.
- Presentation size is dominated by embedded media, so limits tuned for documents are often too small for real decks.
Technical details
| File name | sample-pptx-20mb.pptx |
|---|---|
| Format | PPTX (PowerPoint presentation (Office Open XML)) |
| Extension | .pptx |
| MIME type | application/vnd.openxmlformats-officedocument.presentationml.presentation |
| Size | 20,971,520 bytes (20 MB) |
| Kind | Binary |
| Signature | 50 4B 03 04 |
| SHA-256 | e2bdb7d45ed7425fe067708fa39907c9bc1c74157fa6e8f33b70263535b3ec4a |
| Created | 2026-10-23 |
| Validation | See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility. |
| Preview | Not available for this file; details only |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Presentations |
Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.
sha256sum sample-pptx-20mb.pptx # Linux
shasum -a 256 sample-pptx-20mb.pptx # macOSOn Windows, run Get-FileHash sample-pptx-20mb.pptx -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.
Related files
Questions about this file
- Is this file exactly 20 MB?
- Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 20 MB PPTX file?
- A five-slide deck with a title slide, bullets, a table and speaker notes, plus one embedded test-card PNG of 20,936,854 bytes, stored uncompressed and sized so that the presentation is exactly 20,971,520 bytes. Padding of 11,496,870 bytes in a private ancillary PNG chunk ("spAd", skipped by decoders) inside the image makes up the rest.
- What is on the slides?
- Five slides: a title, a bulleted list with speaker notes, a picture, a table and a closing slide.