Generate a sample HTML file
Choose a size and save an HTML page with comment padding. Inspect the markup before serving the downloaded file in your own application.
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: 10,485,760 B. Generate and download each file to test your endpoint.
HTML, built to spec.
Each file is a complete HTML5 document that renders in a browser. The size you ask for is reached with an HTML comment, so the result opens in Chrome, Firefox, Safari and Edge. Most people generate these for testing page-weight budgets and HTML upload handling.
Choose a size here
These options set the generator above. Separate size guides explain how to test a particular upload boundary.
File structure and testing limits
An HTML example with comment padding. Treat it as active web content and inspect it before serving it in your own application.
Format reference: WHATWG HTML.
This generator assembles the file in your browser; file content is not sent to a server. Site analytics may make network requests. Office ↔ PDF conversion uses a separate server workflow. Data processing and privacy.
Technical notes for every format · Guide to testing file upload limits
Questions
How small can an HTML file be?
About 189 bytes. Below that the format cannot carry its mandatory structure, let alone padding.
Will the file open normally?
Validate the generated fixture in your target application. Parts added for exact size may change or disappear when the file is re-saved; compatibility depends on the reader.
Can I ask for an unusual size?
Any byte count above the minimum works — for example 3,145,728 bytes (exactly 3 MB) or 27.5 MB. Drag the caliper or type the number.
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