Split Archive into Parts

Why split archives with Tools Root

A single large archive sometimes needs to become several smaller parts, to fit an upload limit, an email attachment cap, or any size restriction that applies to the whole. This free tool compresses your files and splits the result into size-limited parts directly in the browser.

Real multi-volume splitting, not arbitrary byte-chunking

This uses genuine archive volume-splitting, the standard technique real archiving software uses, producing correctly-structured parts specifically meant to be reassembled together — not a naive chop of the finished file into arbitrary byte-sized pieces that wouldn't reconstruct reliably.

A free archive splitter with a clear size estimate

Rather than guessing at how many parts you'll end up with, this tool shows an estimated part count before you split, based on your chosen size limit — at no cost and with no restriction on total file count.

Common use cases

Splitting a large backup into parts small enough to email as separate attachments, breaking a large file collection into pieces that fit a specific upload size limit, splitting an archive for transfer across a size-restricted connection, dividing a large project archive into more manageable individual downloads, or preparing files for a storage medium with a fixed size limit per file.

Related archive tools

If the files don't actually need splitting and a size limit isn't the issue, Create Archive compresses everything into one regular archive instead.

Why every split part is needed to reconstruct the whole

Multi-volume archive splitting works by dividing the compressed data stream itself across parts, not by keeping each part as an independently valid mini-archive — this is precisely what allows for efficient, size-flexible splitting in the first place, but it also means the parts are genuinely interdependent, and reconstruction only works with the complete set present.

Choosing a part size that fits your actual constraint

The right part size comes directly from whatever limit you're working around, an email provider's attachment cap, a specific upload system's maximum file size, or a storage device's per-file limit — choosing a size safely under that real constraint, rather than exactly at it, leaves a margin for any overhead the split process itself adds.