Bounded-memory streaming
Input and output limits are enforced while data is processed, before oversized content can overwhelm memory.
Private by design
Unzip files.
Keep them yours.
Private, offline ZIP extraction for Firefox and Chrome, entirely in your browser. Fast enough for everyday work, hardened for the files you do not trust.
- Zero install permissions
- Chrome + Firefox
- Open source
The privacy promise
Your files stay where they belong.
Your files never leave your device; no uploads, no accounts, no telemetry; all processing local.
This rests first on what you can audit: the extension declares zero permissions, and neither its source nor its built bundle contains network code (no fetch, XMLHttpRequest, WebSocket, sendBeacon, EventSource, or telemetry; a CI check greps the built extension for those primitives and fails if any appear). A strict no-egress content-security policy (connect-src 'none') is defense in depth; because a content-security policy does not restrict top-level navigation, it is not the sole line of defense, and source review confirms the extension navigates nowhere external. The empty permission list and the CSP are checked in CI against the built manifest. See the peer review and technical teardown.
Local processing
Zero telemetry
No account
How privacy is enforced
The receipt, not just the promise.
Unzip ships with an empty permission list and a strict no-egress content-security policy. Both are checked in CI against the built manifest on every change.
Declared permissions
"permissions": []Extension-page content-security policy
default-src 'none'; script-src 'self'; style-src 'self'; img-src 'self' data: blob:; connect-src 'none'; form-action 'none'; base-uri 'none'; object-src 'none'The guarantee rests first on zero permissions and code with no network calls (neither the source nor the built bundle contains fetch, XMLHttpRequest, or WebSocket, enforced by a CI grep of the built extension); connect-src 'none' is defense in depth that blocks connections from the extension page even if a bug were introduced. A CSP does not cover top-level navigation, so it is not relied on alone, and source review confirms the extension opens no external pages. Saving a file uses your browser's standard download from an in-page blob, so no downloads permission is requested. See the peer review and technical teardown.
Built for hostile archives
A small utility with serious boundaries.
Every layer is designed to keep extraction predictable, responsive, and safely on your device.
Fail-closed parsing
The central directory is authoritative. Contradictions and malformed archives stop cleanly.
Full path safety
Traversal, absolute paths, reserved names, control characters, and unsafe file types are rejected.
Virtualized file tree
Browse large archives without turning thousands of entries into a sluggish page. Filter and sort the tree, then download only what you need.
Flexible downloads
Save one file directly or download everything while preserving safe folder paths.
Cancel and drop guard
Cancel active work immediately. New drops cannot race or corrupt an operation in progress.
WCAG AA
Keyboard-first controls, visible focus, semantic structure, and carefully checked contrast.
Real-Firefox E2E
The production extension flow is exercised in Firefox, including worker loading, archive handling, and the interface users actually see.
One MV3 codebase
The same source ships to Firefox and Chrome, keeping behavior aligned across browsers.
Zero permissions
Unzip requests no install-time permissions. Saving a file uses your browser's standard download, so no download permission is requested.
The complete flow
Calm in every state.
One focused screen from first drop to final download, with clear recovery when an archive is not safe to open.
01 Drop
02 Inspect
03 Recover
See it in Firefox
From ZIP to files in seconds.
A real run of the extension, captured in Firefox.
Text description of the demo
The recording shows Unzip's start screen with a drop zone to open a ZIP archive. An archive is opened and its contents list in a sortable, filterable file tree. Files download individually or all at once, with all processing staying on the device.
Install Unzip
A developer preview you can run today.
Signed store listings are on the way. Until then, download the latest release build and load it unpacked: in Chrome via chrome://extensions (Developer mode, then Load unpacked), or in Firefox via about:debugging (Load Temporary Add-on). A temporary add-on is cleared when Firefox restarts.
Get it forFirefox
AMO · Coming soon
Get it forChrome
CWS · Coming soon