Download 500 MB binary file for testing

Test transfer, storage or upload-size limits with raw bytes. The preset is 500 MiB (524,288,000 bytes); choose MB for decimal megabytes.

524,288,000 bytes · built in your browser, nothing uploaded
524,288,000 bytes
500 MiB · BIN · 1 B
Exact size

1 MB = 1,000,000 B · 1 MiB = 1,048,576 B

Advanced: test an upload limit

Enter the byte limit above, then choose one byte below, the exact limit or one byte above. Each choice uses the same base: 524,288,000 B. Generate and download each file to test your endpoint.

Where a 500 MB BIN comes up

  • Measuring real upload and download speed between two machines.
  • Testing a CDN or proxy upload cap on higher-tier plans.
  • Checking that chunked uploads resume after a dropped connection.

Limits it lands on

  • Cloudflare's Enterprise plan defaults to a 500 MB request body limit; since 500 MiB is 524,288,000 bytes, this file is just over a decimal 500 MB.
  • At 100 Mbit/s it takes about 42 seconds to transfer; at 1 Gbit/s about 4 seconds.

What is inside the file

A fixed 65,536-byte block of printable pseudo-random bytes, repeated with no header. gzip only reduces it to about 82%, but brotli and zstd with long windows can compress the repetition heavily, so turn off transfer compression for speed tests.

Saved as sample-500mb.bin.

Other BIN sizes

1 GB BIN

1,073,741,824 bytes

100 MB BIN

104,857,600 bytes

20 MB BIN

20,971,520 bytes

10 MB BIN

10,485,760 bytes

5 MB BIN

5,242,880 bytes

Questions

Why .bin instead of .zip for speed tests?

There is no container to parse and no compression shortcut; the network has to carry every byte.

Does it contain anything executable?

No. It is filler bytes only.

Reference and checks

Format reference: RFC 2046 octet-stream.

Generate another size in this format · Technical notes for every format · Guide to testing file upload limits · Data processing and privacy

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