Split & Join Files
Divide an oversized file into predictable binary pieces and later reconstruct a validated numbered set without conversion.
Add a file to split
Any file type is supported. Its original binary bytes stay unchanged.
Splitting, checksum calculation, validation, joining, and download preparation happen locally in your browser. Files are never uploaded.
How to use Split & Join Files
- 1
Open Split File, add any one source and choose By part size with a preset or custom MB/GB value, or By number with a preset or custom count.
- 2
Review the estimated pieces and decide whether to Include SHA-256 checksums when available. Split, then download exact .part001-style files and the JSON manifest.
- 3
Open Join Files and add one complete numbered set, optionally with its matching manifest. Check automatic numeric order or deliberately use the manual ordering controls.
- 4
Resolve missing, duplicate, mixed or invalid parts, click Join Files, read the checksum-verification status and download the reconstructed original.
Frequently asked questions
About Split & Join Files
Split & Join Files treats every source as binary data, making it useful for moving a large video, archive, disk image or dataset through a size-limited channel. Part-size presets and custom MB or GB values suit fixed limits, while part-count mode is better when the desired number of pieces is known. The live estimate makes the consequence visible before slicing starts.
Each output keeps the complete original name followed by a zero-padded .part001-style suffix and an application/octet-stream type. An optional JSON manifest describes the source and every part; files up to the practical checksum threshold can also receive source and per-part SHA-256 values. Bulk saving never repackages the pieces into another archive.
Join mode recognizes numeric suffixes, checks continuity and rejects missing, duplicate, empty or mixed sets before reconstruction. A supplied manifest adds filename, size and checksum validation. Without an original checksum the join can still complete, but the interface carefully distinguishes structural validation from cryptographic proof.