File Chunk Splitter
Split a file into numbered chunks and download a ZIP
File Chunk Splitter — what it does
Split any file into numbered chunks of a size you choose and download them together as a ZIP. Each chunk is a plain byte-range segment of the original, which keeps the format simple, transparent and perfectly reversible with the companion merger tool.
When this tool helps
- Getting a large file through a mail system with a hard attachment limit.
- Storing a big archive across media or services with per-file size caps.
- Transferring a file over an unreliable link in smaller, resumable pieces.
How to use it
- Choose the file to split.
- Set the chunk size and unit.
- Split the file.
- Download the ZIP of numbered chunks.
Accuracy, limits, and good practice
- Pick a chunk size below the strictest limit in the path — a 25 MB mail cap wants chunks of 20 MB or less once ZIP and mail overhead are counted.
- Keep the numbered filenames exactly as generated; the numbering is what the merger uses to order the parts.
- Record the original file's SHA-256 before splitting so the reconstruction can be verified at the other end.
Frequently asked questions
Are the chunks usable on their own?
No. Each is a raw byte segment, meaningless alone; only the merged sequence reproduces the file.
Does splitting compress the file?
No, total chunk size equals the original. Compress first with the ZIP tool if you also want it smaller.
How does the recipient put it back together?
With the file chunk merger on this site — select all parts, name the output, merge and verify.
Related tools on this site
- Text File Merger — Combine multiple text files in order with a custom separator
- Directory Tree Generator — Select a folder and generate a downloadable text directory tree
- Local Notes Pad — Write notes that are saved privately in your browser
Everything above runs inside this page. File Chunk Splitter needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
檔案分塊工具能做什麼
把任意檔案切成你指定大小的編號分塊，一併打包成 ZIP 下載。每個分塊都是原檔的一段純位元組範圍，格式簡單透明，配合本站的合併工具即可完美還原。
什麼時候用得上
- 讓大檔案通過有硬性附件上限的郵件系統。
- 把大型封存檔分放到有單檔容量限制的媒體或服務。
- 在不穩定的連線上，以較小、可續傳的片段搬運檔案。
使用步驟
- 選擇要切割的檔案。
- 設定分塊大小與單位。
- 執行切割。
- 下載內含編號分塊的 ZIP。
精確度、限制與實務建議
- 分塊大小要低於路徑上最嚴的限制——25 MB 的郵件上限,扣掉 ZIP 與郵件開銷後,分塊取 20 MB 以下較穩。
- 編號檔名請原樣保留，合併工具就是靠編號排序組回。
- 切割前先記下原檔的 SHA-256，對方合併後才能驗證。
常見問題
單一分塊本身能用嗎？
不能。每塊都是原始位元組片段，單獨無意義；只有依序合併才能重現檔案。
切割會壓縮檔案嗎？
不會，分塊總大小等於原檔。想更小請先用 ZIP 工具壓縮再切。
對方怎麼組回去？
用本站的檔案分塊合併工具——全選分塊、命名輸出、合併並驗證。
本站相關工具
以上步驟全部在這個頁面內完成，檔案分塊工具 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。