FILE TOOL // 77

File Truncation Tool

Keep an exact leading or trailing byte count and download a genuinely truncated copy.

Processed locally in your browser

Select one file

Local input

Drop files hereChoose one file. File names, sizes, types, and modification dates stay in this browser session.

FileSizeType

No files selected.

Bytes to keepKeep from

Choose files to begin.0 files

How to use File Truncation Tool

Select the requested local file or folder.
Review the tool-specific options.
Run the tool and inspect the result summary.
Download the newly created result or report.

What this file tool does

The tool uses an exact Blob slice to retain either the beginning or end of the selected file, without modifying the source.

The result is calculated from actual file bytes or metadata supplied by your browser.

Processing is local. Browser memory, file permissions, format variants, and device performance can limit very large jobs.

Supported inputs and limits

This tool accepts one file. Unsupported structures are reported rather than guessed.

Environment	Modern desktop browser
Privacy	No upload
Output	New file or auditable report

Example and practical tips

Start with a small representative set so you can confirm the options and output format. Keep the source files until the downloaded result has been tested in its intended workflow.

For backup or integrity work, store the report beside the corresponding version so later checks remain understandable.

Frequently asked questions

How do I truncate a file to an exact byte size?

Enter the number of bytes to keep, choose the start or end, and run the tool.

Can I remove bytes from the beginning?

Yes. Choose Keep from end to retain only the final byte count.

What if the requested size is larger than the file?

The tool refuses the operation because it would not create a truncated result.

Can truncation damage a file format?

Yes. Most structured formats become invalid when required bytes are removed.

Is the original file modified?

No. The result is a separate downloadable Blob.

Related file tools

File Padding Tool Byte Range File Extractor Large File Splitter File Chunk Viewer

Processing details

Tool number	77
Category	File Splitting & Assembly
Execution	Browser local