Block Spark
Block
Block Spark
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Client-side processing
Most tools run entirely in your browser. Your files never leave your device.
Auto-deleted after download
For server-side tools, your file is permanently deleted once the download link expires.
SSL encrypted transfer
All file transfers use HTTPS / TLS encryption end-to-end.
Never stored or shared
We do not store, sell, or access your files. Zero data retention policy.
Up to 50 MB per file
Max upload size per file.
Full security details →
Full security details →