Random file generator

Create a binary sample file with an exact byte count for local development.

On your device · No account

Privacy details

Random file generator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

File size in bytes

More options

File contents

Your result

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-19

Using Random file generator

Random file generator allocates exactly the byte count you enter. Random mode fills every byte with Web Crypto in bounded chunks; zero mode creates a predictable all-zero fixture.

Next: Fake data generator

A worked example

A size of 1024 creates exactly 1024 bytes. It is a binary fixture, regardless of how another app might interpret those bytes.

Before you use the result

The file is not a valid PDF, photo, archive or media file. It is intended for size limits, binary transport and error-handling fixtures. The size limit bounds memory use in this browser.

Cite this page

Citation style

ToolOctopus. “Random file generator.” Updated 2026-09-19. https://tooloctopus.com/random-file-generator.

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