A 10 MB PDF test file

About this file

A 10 MB test file in PDF format, sized to exactly 10,485,760 bytes. Free to download with no signup, for verifying upload limits and file-handling behaviour.

The MD5, SHA-1 and SHA-256 values listed above are the real digests of this file. Recomputing them after download confirms the transfer was not corrupted, and they double as known-good expected values when testing a hashing library.

What this size means in practice

10 MB is one of the most common "round number" caps chosen for forms and CMS uploads. It is exactly 10,485,760 bytes (10 × 1024 × 1024), which also lets you detect whether an implementation computes MB with 1000 or with 1024.

An implementation using 1000 rejects anything past 10,000,000 bytes, so this file fails there. One using 1024 accepts it as exactly at the limit. To pin down the boundary precisely, combine it with the threshold set (9.9 MB / 10.0 MB / 10.1 MB).

Getting a feel for this size

On a 10 Mbps link the transfer takes roughly 8.4 seconds, and about 839 ms at 100 Mbps. Base64-encoded it grows to roughly 13,653 KB.

Assuming a text-oriented PDF with embedded fonts runs about 80 KB per page, this size is on the order of 128 pages. Image-heavy PDFs will hold far fewer pages at the same size.

What to check for this format

PDF starts with the %PDF- signature and keeps a cross-reference table (xref) at the end that points to every object. Because of that layout, losing the tail of the file makes the whole document unreadable — which makes PDF a good subject for truncation-detection tests.

• Whether page-count extraction and text extraction finish without timing out on large files
• The time and memory cost of thumbnail generation, i.e. rasterising the first page
• Because PDF can embed JavaScript and external references, whether your sanitisation path runs when accepting user uploads