Windows App

ZB Transfer

Copy files and know they arrived correctly. ZB Transfer uses BLAKE3 cryptographic hashing to verify every byte — so you can trust your backups and transfers.

Get on Microsoft Store

Features

Copy & Verify

Copies files then verifies each one using BLAKE3 hashing. The job only completes when every file is mathematically confirmed identical to the source.

Compare Folders

Check two folders for differences without copying anything. Fast mode uses file size and date; BLAKE3 mode does full content verification.

Resume Support

Interrupted transfers can be resumed exactly where they left off. No need to restart a large job from scratch after a disconnection or shutdown.

Real-time Progress

Live transfer speed, ETA, and per-file status as the job runs. Detailed activity log for every operation so you know exactly what happened.

Skip Existing Files

Option to skip files that already exist at the destination. Useful for incremental backups or topping up a partially complete transfer.

500–800 MB/s

Optimised with 8 MB chunk sizes for maximum throughput. Typical SSD speeds of 500–800 MB/s — competitive with native Windows copy.

Manual

System Requirements & Installation

Requires: Windows 10 or later, x64 processor, 100 MB disk space.

Install from Microsoft Store.

Copy & Verify (Recommended)
  1. Launch ZB Transfer.
  2. Click Select Source and choose your source folder.
  3. Click Select Destination and choose where to copy.
  4. Select Copy + Verify mode.
  5. Click Start Transfer.

ZB Transfer scans the source, copies files in 8 MB chunks, computes BLAKE3 hashes during copy, then compares source and destination hashes. The job only reports success when all hashes match.

Compare Mode

Use Compare to check two folders for differences without copying anything.

  • Fast — checks file size and modification date. Very quick but does not detect content-level corruption.
  • BLAKE3 — full content verification. Slower but detects any difference, including silent corruption.

Results show missing files per folder. You can optionally copy selected missing files to the destination from the results view.

Resuming an Interrupted Transfer

If a transfer is interrupted (power loss, disconnection, manual stop), reopen ZB Transfer with the same source and destination. Enable Skip Existing and select Copy + Verify.

ZB Transfer will skip files already present at the destination and continue with the remaining files. Files that were partially written will be re-copied and verified.

Understanding Results

Successful transfer: All files copied and all BLAKE3 hashes matched. Your destination is a verified identical copy of the source.

Verification failure: One or more files did not match. ZB Transfer lists the affected files. Re-run the transfer for those files or investigate the drive for errors.

The activity log records every file operation. Access it from the results panel after the job completes.