File Size Generator
Create a test file of an exact size in KB, MB or GB with custom content
文件大小
单位
填充模式
文件名
实际大小
1.00 MB (1048576 字节)
提示：文件在浏览器内存中生成，建议单次生成不超过 500MB，过大可能导致浏览器卡顿或崩溃。随机数据使用加密级随机源；自定义文本模式将按输入内容循环重复填充。
About this tool
The generator writes a test file to an exact size:
- Exact size: bytes, KB, MB or GB, down to the byte
- Fill modes: random data, zero bytes or repeating custom text
- Instant download: the file is built and saved locally with no server involved
- Large files: Blob streaming keeps memory in check up to a few hundred MB
- Custom name: choose the filename and extension
When to use it
- Test upload and download bandwidth
- Fill or test storage capacity
- Check how a filesystem handles large files
- Produce a file of a required size for software testing