Empty File Creator
Generate empty or fixed-size dummy files for testing. Fill patterns (zeros, random, 0xFF, sequential), size presets (1KB / 1MB / 100MB / 1GB), custom extensions, filename templates with numbering, batch creation, and download. 100% client-side.
About Empty File Creator
Generate empty or fixed-size dummy files for testing. Fill patterns (zeros, random, 0xFF, sequential), size presets (1KB / 1MB / 100MB / 1GB), custom extensions, filename templates with numbering, batch creation, and download. 100% client-side. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
What can this tool create?
Empty (0-byte) files, fixed-size files filled with a pattern of your choice (zeros, 0xFF, sequential bytes 0..255..0, or cryptographically-random), with custom size in B/KB/MB/GB, custom filename, custom extension, and filename templates with auto-numbering for batch creation.
Why would I need an empty file?
Empty files are commonly used for placeholder files (.gitkeep, .keep), testing file-system behavior, seeding directory structures, or testing upload/download pipelines without transferring real data. Fixed-size dummy files are used for benchmarking disk I/O, network transfer limits, or testing quota systems.
What extra features does this tool have?
10 extras: (1) Multiple file batch creation. (2) Fill pattern (zeros/random/0xFF/sequential). (3) File size presets (1KB/1MB/100MB/1GB). (4) Custom extension. (5) Stats (created count, total size). (6) Filename template with numbering ({n} → 001, 002, ...). (7) Preview first 64 bytes as hex. (8) Copy file info to clipboard. (9) History (localStorage — last 10 creations). (10) Shareable URL with settings.
Is my generated file uploaded anywhere?
No. All file generation happens in your browser using Uint8Array + Blob. The file never leaves your device.
What's the maximum file size?
There's no hard limit, but generating files larger than 1GB may exhaust browser memory (Chrome tab limit is ~4GB). Use the 100MB preset for safe benchmarks; for >1GB use a native tool (e.g. `truncate -s 1G file.bin` on Linux or `fsutil file createnew file.bin 1073741824` on Windows).
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