How To Split And Rejoin A Large File
Create manageable parts, keep the manifest and verify the joined file before using it.
Before You Start
Break a large file into manageable parts, then rebuild a verified copy with every byte in place.
Keep the whole generated .parts folder: every numbered part, manifest.fsj.json and the .check integrity file where generated. This release rejoins sets created by this app, not arbitrary historical splitter formats. Splitting is not compression or encryption.
Follow The Workflow
- Choose. Select your file and a destination for the parts.
- Split. Choose a part size and keep the whole generated .parts folder.
- Join. Select its manifest and verify the rebuilt file with all companion files present.
Review The Result
Keep the original until the recipient has a verified joined file. Send the whole generated .parts folder: every numbered part, manifest.fsj.json and the .check integrity file where generated. Do not filter the folder down to numbered parts alone. A successful join means the final content passed the SHA-256 check.
Questions About This Task
Will splitting reduce the total file size?
No. Splitting divides the data into parts. It does not compress the original or make the contents private.
What do I send to the recipient?
Send the entire generated .parts folder, including all numbered parts, manifest.fsj.json and the .check integrity file where generated. Keep them together so the receiver can verify and join the file.
Can it join a file if one part is missing?
No. A missing, modified or reordered part, manifest or required .check integrity file stops the join. The app does not publish an unverified final file.