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NullClipper

Chrome · Opera · Edge

NullClipper for your browser

Snip or record a short GIF of the current tab. Copy a PNG, or an encrypted NullImage link — no account, no tracking, ever.

Add to ChromeAdd to Opera
Chrome · liveOpera · liveEdge · coming soon

Manifest V3 · current tab only · MIT licensed · need the whole desktop? try the Windows app

NullClipper's crop overlay in a browser tab: the page dimmed, a Snip/GIF toolbar, and a drawn rectangle over a chart on the page

Capture in three steps

  1. 1

    Click the icon, or press the hotkey

    Pin NullClipper and click Capture, or press Alt+Shift+X — rebindable any time in the browser's extension shortcuts page.

  2. 2

    Drag a region on the freeze-frame

    The rest of the tab dims. Esc or the close button cancels — nothing is captured until you draw a rectangle.

  3. 3

    Snip copies a PNG, GIF records up to 8s

    Same mode selector, same region. GIF runs at ~12 fps with its longest side capped at 640px, so files stay small.

What it does

  • Captures just the current tab

    No screen-recorder permission dialog, no access to your other tabs or desktop — captureVisibleTab snapshots only the tab you're looking at, and only after you act.

  • Never injects into the page

    The tab is snapshotted and cropped in an extension-owned window, not a content script. It's also why NullClipper still works on ordinary sites in Opera, which normally blocks sideloaded extensions from scripting pages.

  • Snip or a short GIF

    Snip copies a still PNG. Switch to GIF in the same toolbar to record that region for up to 8 seconds — same size cap, same region, one mode selector.

  • Copies straight to the clipboard

    By default a capture lands on your clipboard immediately. Nothing leaves your device unless you turn NullImage uploads on.

  • Optional NullImage upload

    Flip the switch in the popup and a capture is encrypted on your device — the same ni1-aes-gcm-256 scheme as nullimage.org — before the ciphertext is sent. The link is copied instead of the image.

  • Nothing phones home

    No accounts, no analytics, no ads, no crash telemetry. Settings live in the browser's local extension storage on your device — uninstalling deletes them.

NullClipper's popup: a Capture button, a Snip/GIF mode toggle, the Alt+Shift+X hotkey, and the Enable NullImage uploads switch
The popup — everything one click away.
NullClipper's settings page: NullImage server URL, expiry, burn after first view, and an optional password

Optional · NullImage

An encrypted link instead of an image

Off until you turn it on. Each capture is encrypted on your device with AES-256-GCM; the key stays in the link's #k= fragment, which browsers never send to a server.

The settings page — Server, expiry, password… in the popup — sets the server (default nullimage.org, or your own), expiry from 1 hour to 7 days, burn after first view, and an optional password. If an upload ever fails, the image is copied locally instead.

Extension vs. the Windows app

Same encryption, same NullImage link format — different capture surface.

FeatureBrowser extensionWindows app
Region snipVisible area of the current tabAny monitor or window, freeform too
Full captureFull visible tabFullscreen monitor
GIFRegion of the tab, ~12 fps, 8s max, 640px capSame limits, any screen region
ClipboardPNG (GIF where the browser accepts image/gif)PNG / GIF via the Windows clipboard
NullImageSame ni1-aes-gcm-256 scheme, server configurableSame ni1-aes-gcm-256 scheme
HotkeyAlt+Shift+X, rebindableCtrl+Shift+X, rebindable

Permissions, and why each exists

This is the text submitted for store review. There is no scripting permission and no content-script injection into web pages.

activeTab
Used only when you click Capture or press the hotkey, so we can snapshot the visible area of that tab.
tabs
Find the active tab, refuse restricted pages (chrome://, the stores), and open the crop / GIF UI as an extension page.
clipboardWrite
Copy the PNG, GIF, or NullImage share link to the clipboard on your device.
storage
Save Snip/GIF mode and optional NullImage settings locally. Nothing is synced to us.
commands
Keyboard shortcut to start a capture (default Alt+Shift+X).
offscreen
Manifest V3 helper document used to write image bytes to the clipboard.
Host permission (optional)
Requested only if you enable NullImage, and only for the server origin you enter — never used to read websites for capture.

Full policy: nullclipper.org/privacy

Install

Chrome and Opera: Chrome Web Store or Opera add-ons — one click.

Edge: the Edge Add-ons listing isn't live yet. Until it is, Developer Mode is a two-extra-click install:

  1. 1Download NullClipper-extension.zip from the latest GitHub Release and unzip it to a folder you'll keep.
  2. 2Open edge://extensions and turn on Developer mode.
  3. 3Click Load unpacked, select that folder, then pin NullClipper.

Full per-browser walkthrough: docs/install.md · source: extension/