File Splitter
Split large files into smaller parts
Files up to 5 GB; when splitting by size, up to 1,000 parts. Each part is an exact byte range of your file, and nothing is uploaded.
Click or drop a file hereChoose a file
About File Splitter
File Splitter cuts any file into numbered pieces named file.part1, file.part2, and so on, either by a size you set in bytes, KB, or MB, or into a number of equal parts. Its Join parts mode puts the pieces back together in order and refuses a missing or doubled part, or one whose size does not fit. Use it to pass a large file through an email, an upload form, or a storage service that caps file size. Splitting does not compress or change any byte: joined parts give back the exact original. The parts are byte ranges cut by this page from your file.
How to split a file into parts
- 1In "Split a file", choose the file.
- 2Pick "By size" and set "Chunk size" with its "Unit", or "Into equal parts" and the "Number of parts".
- 3Click "Split file".
- 4Save each part with "Download", or all of them at once with "Download all".
- 5To rebuild the file later, open "Join parts", click "Choose all the parts (name.part1, name.part2…)" and download the joined file.
Formats and limits
- File to split
- Up to 5 GB, of any type
- Parts
- Up to 1,000 when splitting by size; equal parts differ by one byte at most
- Units
- B, KB (1024 bytes), and MB (1,048,576 bytes)
- Part names
- name.part1, name.part2… after the original file name
- Joining
- Every part of one split, chosen together; no size limit set
Where your file is processed
Parts are cut from your file by this page and the joined file is assembled here too; nothing is uploaded. When the parts are listed, the page reads each one to prepare its download, and "Download all" builds the ZIP in memory, so a very large split needs free memory. Error messages, if any, reach our error log cleaned of file names, with the tool name and browser version.
Frequently asked questions
Can I join the parts back into the original file?
Yes. Choose "Join parts" and select every .part file of the same file at once. They are joined in number order; a missing or doubled part, or a part whose size does not fit the others, is refused with a message. Parts are matched by name and size only, so keep the parts of each split apart. On a computer, "copy /b" on Windows or cat on Mac and Linux do the same.
Is there a size limit?
Yes: 5 GB per file to split, and, when splitting by size, at most 1,000 parts, so choose a bigger chunk size if you reach it. Joining is not capped by the tool.
Does splitting change or compress the file?
No. The parts are exact byte ranges of the original, so joining them gives back the identical file. Nothing is compressed: together, the parts are exactly as large as the original.
Are KB and MB counted in multiples of 1024?
Yes. In "Unit", KB means 1024 bytes and MB means 1,048,576 bytes. If a service states its limit in decimal megabytes, choose a chunk size a little under that limit.
Tips and tricks
- ✓Keep the original file until you have joined the parts once and checked the result.