A 10 KB GIF test file

About this file

A 10 KB test file in GIF format, sized to exactly 10,240 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 KB sits below virtually every upload limit, which makes it the baseline "happy path" case. Confirm this file goes through first, then move up in size to probe where your limits actually bite.

It also fits inside the AWS Lambda asynchronous invocation payload cap (256 KB) and typical API JSON body limits. The size is convenient for CI fixtures and unit-test data you commit to a repository.

Getting a feel for this size

On a 10 Mbps link the transfer takes roughly 8 ms, and about 1 ms at 100 Mbps. Base64-encoded it grows to roughly 13 KB.

Estimating a photographic GIF at roughly 0.5 bytes per pixel, this size works out to around 20,480 pixels — about 165 × 124 px at a 4:3 aspect ratio. Compression varies enormously with image content, so treat this purely as an order-of-magnitude figure.

What to check for this format

GIF begins with the ASCII signature GIF87a or GIF89a and uses a palette of up to 256 colours. Because it can hold multiple animation frames, code written for single-frame images either grabs only the first frame or, worse, expands every frame and consumes far more memory than expected.

• Whether resizing an animated GIF preserves the animation or flattens it to a still
• Whether thumbnail generation correctly extracts the first frame
• Whether you cap memory when expanding all frames — usage grows with frame count multiplied by resolution