file splitter utility
file split and merge
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PeaZip is a free cross-platform file archiver and splitter that provides an unified portable GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX...
Create 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP files
Open and extract over 180 archive types: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF, ZIPX files and more...
Features of PeaZip includes extract, create and convert multiple archives at once, create self-extracting archives, split/join files, strong encryption with two factor authentication, encrypted password manager, secure deletion, find duplicate files, calculate hashes, export job definition as script.

file spanning utility

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FAQ / FILE MANAGER > HOW TO HANDLE SPLIT FILES
span archive to multiple volumes

File split and merge



SPLIT A FILE IN SMALLER PARTS (SPAN)

JOIN (MERGE) SPLIT FILE VOLUMES

file split tool



What is file spanning


Splitting a file is cutting the data in span parts of desired size.
Usually, this allows a large file to fit on multiple smaller supports (FD, CD, DVD...) or to fit in multiple email attachments (or upload chunks) if the file is larger than maximum allowed attachment or upload size.
In PeaZip you can select the volume size form a series of pre-set sizes (floppy disk, typical mail attachment maximum size, CD, DVD...) or you can customize it up to byte level.

how to split a file in smaller parts

File split is recommended every time it is needed to fit a large amount of data in a mandatory output size (such as maximum email attachment limit or media support size), rather than proceding with trial and error compression attempts hoping to reduce the output file size under that limit, which may not be possible even with best compression algorithms and highest settings.
Each message / media will contain up to the specified amout of data, guaranteeing the package can be sent / written to disk without errors, fitting in desired max support / attachment size.

file spanning


More online resources: split Unix commandunix split files on Wikipedia, entropy definitioninformation theory compression on Wikipedia, discussion of e-mail attachment limitmaximum email size allowed


How to split files


PeaZip offers different, alternative ways to split & join files:
  1. Add files and folders to the archive's layout (i.e. select it and click Add button), then
    1. Click volume size dropdown menu (by default set on "Single volume, do not split") in order to split the output to multiple volumes, chosing from custom or pre-set sizes (recommended email attachment sizes, CD, DVD, etc): this method allows to combine the benefits of archiving (consolidating multile input files & folders into a single output stream), compression (reducing disk occupation eliminating data redundancy), and file spanning (keeping the output in volumes smaller than a given maximum size).
    2. Alternatively, change archive type option (below output path option) to "Split" and set volume size and optional integrity check algorithm.
  2. Open PeaZip, chose File manage > File Tools > "split file" or "join files" from main menu and provide the input file name (provide the first volume of the set, usually the file with .001 extension for merging back spanned archives).
  3. From Windoiws file explorer you can rightclick on a file and chose to split it from PeaZip's entry in SendTo or Context menu;
If you are splitting a file into multiple removable media, PeaZip will check if the media has enough free space for storing the volumes, and will be asked you to provide a new empty media each time the previous one is full.

Purely splitting a file does not involve compression, that is usually only marginally efficient on multimedia files, like ie. MP3, OGG and other audio formats, or AVI, MPEG, DIVX and other video formats.
As said above, if you prefer to combine splitting with compression, you can add the file(s) to a ZIP or 7Z archive and chose to split (cut) the archive in volumes of a fixed size, in order to keep them below the size limits of a support or mail attachment: this is preferable also when handling multiple large multimedia files in order to store them in a single archive, split in fixed sized volumes, rather than having to split each file separately.
In this case you can set minimum compression or no compression ("store" level) to speed up the process avoiding to compress scarcely compressible data: hints how to improve file compression, how to reduce size of images

Join (merge) split file volumes


PeaZip fully supports, for splitting and merging, raw split format - binary data plainly cut in pieces of the exact specified size - that can be created, also, by utilities like 7-Zip/p7zip, HJSplit, and "split" Unix command.
This file merge process will re-build the original, larger, file or archive from multiple smaller volumes fitting a mandatory maximum size.
Hint: if sent data is correctly received, as role of thumb, all volumes of the spanned set should have same size - matching the desired size limit - save the last volume that will usually be smaller containing only the remaining data to complete the content - but if a real error detection control is needed to validate integrity of received data, use file hasing (or checksum) to verify volumes.
PeaZip can process, only for merging, WinZip spanned archives (.Z01) and WinRar spanned archives (.R01, or .partX.rar).

how to merge a spanned archive


When you receive a multipart file or archive, to join the data back to obtain the original file, move or copy all the parts of the file in the same folder before proceeding with extraction

merge split email attachments


Open the first archive's part with PeaZip, i.e. doubleclick on the first volume wich is usually identified with extension .001, .Z01, R01, .PART1 or similar - please note some times counter may have set to start from 000 (R00, Z00) instead.
Now you can extract it with "Extract" or "Extract all" from PeaZip's tool bar or context menu, or just drag content from PeaZip to the system
Alternatively, righclick on the first volume of the spanned file and use "Extract" or "Extract here" PeaZip's entries in system's context menu



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