Large-file friendly
Incremental checksums read small portions at a time, rather than loading the whole file into memory.
ToolsFile Splitter by Size
FILE UTILITY STUDIO
File Splitter by Size
Split files into exact-size chunks. Put every byte back together with checksum verification. Simple, secure, and completely local.
No uploads SHA-256 verified Large-file friendly
1
Choose your file
Any file type—video, archive, document, or disk image.
Drop a file here, or browse Your file stays on your device.
2
Set the chunk size
Each part is a separate file; the final part can be smaller.
Select a file to calculate the number of parts.
MADE FOR REAL FILES
Serious capability, no complexity.
Thoughtful details for file transfers, backups and offline workflows.
Privacy by design
Processing stays in your browser. No account, server upload, or hidden storage.
Verified restoration
Every numbered part and the final reassembled file are checked with SHA-256.
QUICK GUIDE
How to split and join files
01
Pick your file
Choose a local file and select a part size, for example 25 MiB or 100 MiB.
02
Prepare and save
Generate checksums, then save a folder of numbered parts plus the JSON manifest. Each part is checked while saving. On browsers without folder access, download each part separately.
03
Verify and rebuild
Load the manifest and all parts, verify their hashes, then save your reconstructed file.
COMMON QUESTIONS
Everything you need to know
Are my files uploaded anywhere?
No. Files are read and processed locally by your browser. The tool requires no network request or account to split, verify or reassemble them.
Which files can I split?
Any nonempty file, including MP4, ZIP, PDF, ISO, database backups and project archives. The parts are binary segments, not independently playable or readable media files.
How do I reassemble a split file?
Keep every .pkpart000001-style chunk and the .pixelokay-manifest.json file. Open the Reassemble tab, add the manifest and chunks, verify, then save the result. Direct disk saving checks the bytes again before committing.
Can I split and join files larger than 2 GB?
In supported desktop Chromium browsers on localhost or HTTPS, folder save and file save let the tool write incrementally. Other browsers use Blob-backed downloads, which can fail for very large files due to browser and device limits. Verify disk space before starting.
Can I use the parts without the manifest?
You can transfer and store the parts individually, but this tool requires its manifest to validate checksums and reconstruct the original file. Keep the manifest alongside the parts.