10 KB EPUB sample file
An EPUB file of exactly 10,240 bytes. It is a valid EPUB e-book file, generated for this site and checked with an independent parser.
Download
sample-epub-10kb.epub
10 KB10,240 bytes
Download 10 KB EPUBDirect download. No sign-up and no waiting.
- Type
- application/epub+zip
- SHA-256
64adafd2d9425e62a797abc7edb0aa56cabb73e564fe7ae96f03e7906b6c2569- Direct URL
https://sampletestfiles.com/downloads/epub/sample-epub-10kb.epub
What is in this file
A reflowable EPUB 3 book with 2 XHTML chapters, a stylesheet, a navigation document and one test-card PNG that is stored uncompressed and sized so that the book is exactly 10,240 bytes.
| EPUB version | 3.0 |
|---|---|
| Chapters | 2 |
| Embedded image | PNG, 52 × 38 px |
| Navigation | EPUB 3 nav document |
| DRM | None |
| Container | ZIP (OCF) |
First bytes of the file
The first 64 bytes of sample-epub-10kb.epub as a hex dump: offset, bytes, then the same bytes as text. The EPUB signature is 50 4B 03 04.
00000000 50 4b 03 04 14 00 00 00 00 00 00 00 21 5c 6f 61 |PK..........!\oa|
00000010 ab 2c 14 00 00 00 14 00 00 00 08 00 00 00 6d 69 |.,............mi|
00000020 6d 65 74 79 70 65 61 70 70 6c 69 63 61 74 69 6f |metypeapplicatio|
00000030 6e 2f 65 70 75 62 2b 7a 69 70 50 4b 03 04 14 00 |n/epub+zipPK....|Preview
EPUB files cannot be shown in a browser. Download the file and open it with Apple Books, Kobo and Google Play Books.
Where 10 KB matters
A 10,240-byte file that still arrives in the first round trip of a new connection. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| TCP initial congestion window | About 14.6 KB (10 segments) | A 10 KB response fits in the first flight of packets; the 25 KB sample does not. |
| nginx and Apache request headers | 8 KB per header line by default | Data this large must go in the request body. |
| webpack asset modules | 8 KB by default | Assets over the threshold are emitted as files instead of data URIs. |
Use this file for
- Checking thumbnail and icon handling
- Testing conversion to other formats
- Testing e-book upload and ingestion
Testing notes for EPUB
- Re-zipping an EPUB with a generic tool usually compresses or reorders the mimetype entry, which makes strict readers reject the book.
- EPUB content is HTML, so a reading system that renders it in a web view needs the same script protections as a browser.
Technical details
| File name | sample-epub-10kb.epub |
|---|---|
| Format | EPUB (EPUB e-book) |
| Extension | .epub |
| MIME type | application/epub+zip |
| Size | 10,240 bytes (10 KB) |
| Kind | Binary |
| Signature | 50 4B 03 04 |
| SHA-256 | 64adafd2d9425e62a797abc7edb0aa56cabb73e564fe7ae96f03e7906b6c2569 |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Not available for this format; details only |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Ebooks |
Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Download from the command line and verify
Fetch the file with curl, then compare its checksum with the SHA-256 value above.
curl -o sample-epub-10kb.epub 'https://sampletestfiles.com/downloads/epub/sample-epub-10kb.epub'
sha256sum sample-epub-10kb.epub # Linux
shasum -a 256 sample-epub-10kb.epub # macOSOn Windows, run Get-FileHash sample-epub-10kb.epub -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.
Related files
Questions about this file
- Is this file exactly 10 KB?
- Yes. It is 10,240 bytes, which is 10 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 10 KB EPUB file?
- A reflowable EPUB 3 book with 2 XHTML chapters, a stylesheet, a navigation document and one test-card PNG that is stored uncompressed and sized so that the book is exactly 10,240 bytes.
- Do the sample e-books have DRM?
- No. They are unencrypted EPUB 3 files with a navigation document, a stylesheet and one image.