Split Files
Split a large file into smaller parts by size limit - useful for sharing or uploading
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About Split Files
Split Large Files into Smaller Pieces
We have all been there: you need to send a file that is too large for email, upload something that exceeds a platform's size limit, or break a massive dataset into manageable chunks for processing. Our Split Files tool divides any file into smaller pieces of a size you specify - entirely in your browser, with no uploads and no file size restrictions from our end.
Why Would You Need to Split a File?
File size limits are everywhere. Email services typically cap attachments at 25 MB. Many web forms restrict uploads to 10 or 50 MB. Cloud storage platforms sometimes choke on very large individual files. And if you are transferring data over an unreliable connection, sending ten 50 MB chunks is far more practical than sending one 500 MB file that fails at 90% and forces you to start over.
Here are the most common scenarios where splitting files makes life easier:
Email attachments - Break a 100 MB file into four 25 MB pieces and send each in a separate email. The recipient reassembles them on their end.
Upload limits - Many hosting platforms, form builders, and file-sharing services impose per-file size caps. Splitting lets you work around these limits without compressing or degrading your data.
Data distribution - When sharing large datasets with a team, smaller files are easier to download, verify, and process independently.
Backup strategies - Splitting large backup archives into smaller volumes makes them easier to store across multiple media or cloud buckets with per-object size limits.
Resumable transfers - If a large transfer fails partway through, you only need to re-send the failed chunk rather than the entire file.
How the File Splitter Works
Select or drag-and-drop your file into the tool. Choose your desired chunk size - in kilobytes, megabytes, or a specific number of equal parts. The tool reads the file in your browser using the File API, slices it into pieces of the specified size, and presents each chunk as a downloadable file.
The splitting happens entirely on your device. Your file is never uploaded to any server. This is important for two reasons: first, there is no upload time regardless of file size, and second, your data remains completely private. You could split a file containing sensitive financial records, medical data, or proprietary source code without any exposure risk.
Supported File Types
The tool works with any file type - binary or text. PDFs, ZIP archives, video files, database dumps, disk images, ISO files, log files, CSV exports - if it is a file, it can be split. The tool does not interpret the file contents; it simply divides the raw bytes into equal pieces. This means the output chunks are not independently usable (you cannot open part 3 of a split PDF and see page 3), but when reassembled in order, they produce the exact original file byte-for-byte.
Reassembling Split Files
To put the pieces back together, the recipient simply concatenates the chunks in order. On the command line, this is as easy as: cat part-001 part-002 part-003 > original-file on Mac/Linux or copy /b part-001+part-002+part-003 original-file on Windows. Many file archivers and split/join utilities can also handle reassembly with a graphical interface.
Performance Considerations
Because the tool processes files locally using browser APIs, performance depends on your device's available memory and processing power. For files up to several hundred megabytes, the operation is typically instant or near-instant. For very large files (multiple gigabytes), the browser may need a moment to process each chunk, but it will handle it without crashing thanks to streaming reads.
Our file splitter is free, requires no installation or account, and works on any modern browser. The next time you hit a file size wall, reach for this tool instead of wrestling with command-line utilities or paid software. Split, download, and move on.