100 KB EPUB sample file
An EPUB file of exactly 102,400 bytes. It is a valid EPUB e-book file, generated for this site and checked with an independent parser.
Download
sample-epub-100kb.epub
100 KB102,400 bytes
Download 100 KB EPUBDirect download. No sign-up and no waiting.
- Type
- application/epub+zip
- SHA-256
c04631bf23d1a08720673c1d03a0ff6370136e40cc860872f3bd0997e1b4049e- Direct URL
https://sampletestfiles.com/downloads/epub/sample-epub-100kb.epub
What is in this file
A reflowable EPUB 3 book with 6 XHTML chapters, a stylesheet, a navigation document and one test-card PNG that is stored uncompressed and sized so that the book is exactly 102,400 bytes.
| EPUB version | 3.0 |
|---|---|
| Chapters | 6 |
| Embedded image | PNG, 202 × 154 px |
| Navigation | EPUB 3 nav document |
| DRM | None |
| Container | ZIP (OCF) |
First bytes of the file
The first 64 bytes of sample-epub-100kb.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 100 KB matters
A 102,400-byte file that sits exactly on the default request-body limit of Express. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Express body parsers | 100 KB (102,400 bytes) by default | A request body of exactly this size passes; anything larger returns 413 Payload Too Large. |
| Gmail message clipping | About 102 KB of HTML | Longer messages are truncated behind a "view entire message" link. |
| Amazon DynamoDB items | 400 KB per item | 100 KB fits; the 500 KB sample does not. |
Use this file for
- Checking email size handling
- Testing conversion to other formats
- Testing e-book upload and ingestion
Testing notes for EPUB
- EPUB content is HTML, so a reading system that renders it in a web view needs the same script protections as a browser.
- Re-zipping an EPUB with a generic tool usually compresses or reorders the mimetype entry, which makes strict readers reject the book.
Technical details
| File name | sample-epub-100kb.epub |
|---|---|
| Format | EPUB (EPUB e-book) |
| Extension | .epub |
| MIME type | application/epub+zip |
| Size | 102,400 bytes (100 KB) |
| Kind | Binary |
| Signature | 50 4B 03 04 |
| SHA-256 | c04631bf23d1a08720673c1d03a0ff6370136e40cc860872f3bd0997e1b4049e |
| 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-100kb.epub 'https://sampletestfiles.com/downloads/epub/sample-epub-100kb.epub'
sha256sum sample-epub-100kb.epub # Linux
shasum -a 256 sample-epub-100kb.epub # macOSOn Windows, run Get-FileHash sample-epub-100kb.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 100 KB?
- Yes. It is 102,400 bytes, which is 100 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 100 KB EPUB file?
- A reflowable EPUB 3 book with 6 XHTML chapters, a stylesheet, a navigation document and one test-card PNG that is stored uncompressed and sized so that the book is exactly 102,400 bytes.
- Do the sample e-books have DRM?
- No. They are unencrypted EPUB 3 files with a navigation document, a stylesheet and one image.