Overwrite file contents with random data before deletion to prevent recovery, using client-side processing.
Shredding replaces a file's contents with meaningless bytes before deleting it, so programs that recover deleted files find nothing left to rebuild. This tool does that entirely in the browser: you select a file through its picker, it overwrites the data with random bytes, then removes the file. Nothing is uploaded. The surprise is how little of the disk a browser can reach: the tool only touches the file you hand it, some browsers grant only read access to picked files, and overwriting the live file never reaches its copies in backups, snapshots, or sync folders. Treat it as a strong software-level deletion, not physical destruction.
The tool reads the selected file, replaces its bytes with random data one or more times, then asks the operating system to remove the file's entry. One pass already defeats undelete software; extra passes add little on modern storage. The overwrite itself depends on the access the browser grants: with a read-only selection, the file can be examined but not rewritten, so the shred cannot run as intended.
Overwriting works on the file's current allocation, not the disk's history. Copy-on-write and journaling filesystems can write the new version to fresh blocks; solid-state drives relocate data through wear leveling and may never touch the original cells, while TRIM simply marks blocks as free. The tool also cannot reach copies held in backups, snapshots, version history, cloud sync, or memory.
One pass defeats every software undelete tool, because recovery programs rebuild files from leftover content, and none is left. Extra passes were designed for old magnetic disks and change nothing on modern drives. What matters more is what you do not control: copies in backups and sync folders, and the SSD's own behavior. Check the file is gone from everywhere you expect.
Browsers are sandboxed: a web page cannot open arbitrary filesystem paths, so the picker is the only way a file becomes visible, and it may grant read-only rights. That is the trade-off of client-side shredding: nothing uploads, but the tool can only work with what you explicitly select. If you need to shred many files or entire folders, a desktop utility with direct filesystem access is the right tool.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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