A 10 MB TXT test file

About this file

A 10 MB test file in TXT 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.

At roughly 120 bytes per log line, this size holds about 87,381 lines — a reasonable basis for estimating how long log aggregation or a full-text scan will take. Line length varies, so treat it as an approximation.

What to check for this format

Plain text is the simplest format, yet two variables alone — character encoding and newline convention — account for a large share of real defects. It carries no signature, so its format cannot be confirmed from the bytes.

• Whether you read line by line — slurping a log-sized text file whole puts heavy pressure on memory
• Whether the presence or absence of a BOM changes your processing
• Whether the final line is still captured when the file does not end with a newline