About this utility
How to use Streaming File Hash
Hash large local files incrementally with SHA-256, SHA-512, SHA-1, or MD5 without loading the whole file into memory.
What to provide
Drop or choose one file. It is read in bounded chunks and never uploaded; the filename is used only on this screen.
- Paste, type, or drag and drop a supported text file into the input area.
- Choose the options that match your intended result.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
What the result means
Hex and Base64 digests, byte count, algorithm, chunk count, and elapsed time.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- SHA-1 and MD5 are offered only for legacy checksums and are unsafe against deliberate collision attacks. Browser file handles remain readable only while this page is open.
Try the included example
Select “Load example” at any time to restore this tested sample.
OmniCastConverter streaming hash fixture