No cloud · No account · No internet

Your clipboard & files, everywhere — off the grid.

OffBridge syncs text and sends files between your Android phone and Windows PC, directly, device to device. Pair once by confirming a 6-digit code, then move files over your network or completely off-grid via QR or NFC. AES-256 encrypted over your network, and nothing ever touches a server.

Get on Google Play Windows installer
AES-256 encrypted Zero telemetry Multi-GB transfers
OffBridge on Android — Clipboard tab with auto-sync on and recent copies OffBridge on Android — Clipboard tab with auto-sync on and recent copies
OffBridge on Windows — System Status showing paired devices OffBridge on Windows — System Status showing paired devices
0
Cloud servers
0
Trackers & ads
256-bit
AES encryption
5
Ways to connect
Clipboard sync

Copy here. Paste there. Instantly.

Copy a link, a code snippet, an address on one device and it's ready to paste on the other. Sync runs quietly in the background, or push it on demand.

  • Real-time & background. Paired devices stay in sync automatically.
  • Push on demand. One tap, or the Android quick-settings tile.
  • History you keep. Recent copies are saved locally and recoverable.
Android Clipboard screen: auto-sync toggle and recent copies Android Clipboard screen: auto-sync toggle and recent copies
File transfer

Send anything. Even when there's no network.

Photos, videos, documents, whole folders, even APKs. Multi-gigabyte transfers move device to device, and pick up right where they left off if the link drops.

  • Any file, any size. Manifest-based batches with live progress.
  • Resume on drop. Connection blips don't restart the transfer.
  • Two-way. Send and receive on either device.
OffBridge on Windows — Send Files with a transfer in progress OffBridge on Windows — Send Files with a transfer in progress
Android transfer in progress showing percentage and size transferred Android transfer in progress showing percentage and size transferred
Connectivity

One app. Every way to connect.

OffBridge automatically finds the fastest link between your devices, and falls back gracefully when there's no router in sight.

The transport ladder

Tries the fastest path first and steps down only if needed, with no settings to fiddle with.

LAN (same Wi-Fi) fastest
Wi-Fi Direct / Hotspot no router
QR / NFC off-grid no network

Every send starts at the top rung and only steps down when a faster path isn't available. You never pick a mode; the app probes and commits in under a second.

  • LAN. Same router, direct over your Wi-Fi at full local speed.
  • Wi-Fi Direct / hotspot. A peer link or a hosted hotspot when there's no router.
  • QR / NFC. Bootstraps a private two-device link from nothing, with no network at all.

NFC tap to send

Tap two phones to start an off-grid file transfer, no network needed. Android

Hold two Android phones back-to-back and the bump hands off the connection details, so the transfer starts without a pairing screen or a shared network.

  • Tap to begin. The NFC bump seeds an off-grid handshake between the two phones.
  • Then the fastest link. Bytes move over the quickest path the phones can form.
  • Only the phone you tapped. The bump keys an ECDH handshake, so no other device can join the link.

QR off-grid

Scan a QR to send or receive files with no shared Wi-Fi. Both platforms.

When there's no network to join, one device shows a QR that carries the link details and the other scans it to connect. No typing, no router.

  • Show, then scan. The code holds everything the two devices need to meet.
  • Both platforms. Windows presents the code; Android scans it with the camera.
  • Verified session. An ECDH handshake proves the scan, so only the scanning device connects.

Hotspot bridge

One device hosts and the other joins, with no shared network required.

One device raises a local hotspot and the other joins it, forming a private two-device network. It's the fallback when there's no LAN and Wi-Fi Direct isn't available.

  • Host and join. A short-lived local access point that only the pair sees.
  • No router, no internet. The bridge is entirely between your two devices.
  • Cleaned up after. The hotspot is torn down when the transfer is done.

Share-sheet

Send straight from any Android app's share button. Android

OffBridge registers as a share target, so a photo, PDF or link goes to your PC straight from whatever app you're already in. No need to open the app first.

  • From anywhere. Gallery, browser, files, chat; if it can share, it can send.
  • One or many. Batch-select several items and they queue as one transfer.
  • Straight to the PC. Picks the same transport ladder as an in-app send.

Filtered history

Browse past transfers and copies.

AllSent ReceivedPending

Every copy and transfer is logged on the device so you can find something later and send it again without hunting for the original.

  • Filter fast. Narrow to Sent, Received or Pending in a tap.
  • Stored locally. The log lives only on your device, never a server.
  • Re-send in a tap. Reopen or resend a past item straight from the list.

Quick-settings tile

“Push to PC” from the Android pull-down, without opening the app. Android

Drop a Push to PC tile into the Android quick-settings panel and your current clipboard lands on the paired PC in one tap, without ever leaving what you're doing.

  • One tap from the shade. Pull down, tap, done; no app switch.
  • Current clipboard. Sends whatever you last copied to the PC.
  • Only to paired devices. The tile respects your verified pairings.

Light & dark

A considered theme on both platforms. Try the toggle up top.

Both apps ship a hand-tuned light and dark theme that follows your system by default and flips on demand, so OffBridge looks at home wherever it runs.

  • Follows the system. Matches your OS light or dark setting out of the box.
  • Or flip it yourself. A manual toggle overrides when you want the other.
  • Consistent across both. The same considered palette on Android and Windows.
Three steps

Paired in seconds, securely

1

Find your device

On the same network, devices discover each other automatically, ready to pair.

2

Verify the code

Both devices show a 6-digit code. Confirm they match and accept; that blocks impostors.

3

Sync & send

Clipboard syncs automatically; send files over the network, or off-grid via QR / NFC when there's no shared Wi-Fi.

Private by design

Your data never leaves your devices.

There is no cloud to breach and no account to leak. Pairing is verified face-to-face with a 6-digit code, and everything in flight is encrypted with keys that exist only on your hardware.

Read the FAQ
Android pairing request showing a 6-digit code to verify on both devices, with Accept and Decline Android pairing request showing a 6-digit code to verify on both devices, with Accept and Decline

Verified pairing (SAS)

A 6-digit code from an ECDH key exchange. You confirm it matches, which stops man-in-the-middle attacks.

Pairing runs an ECDH key exchange, then shows a 6-digit Short Authentication String on both screens. If the numbers match, no one is sitting in the middle.

  • ECDH on the curve. A fresh secp256r1 exchange derives the shared key.
  • You are the check. Confirming the six digits is what defeats an impostor.
  • Pinned after first trust. A later key swap fails closed instead of silently downgrading.

AES-256 encryption

Over your network, every clipboard payload and file is sealed with authenticated AES-256-GCM before it leaves the device.

On a shared network, what you send is sealed with AES-256-GCM under the key from pairing. GCM is authenticated, so tampering is detected, not just hidden.

  • Authenticated. AES-GCM verifies integrity, not only confidentiality.
  • Files too. Large transfers are sealed the same way, chunk by chunk.
  • Off-grid differs. A QR / NFC link is a direct connection between just those two devices, protected by an authenticated handshake rather than a sealed stream.

Keys stay local

Per-pairing keys live only on your devices, never uploaded or shared.

The keys that protect your data are generated on your devices and kept in the OS keystore. They're never uploaded, never shared, and never escrowed anywhere.

  • Per pairing. Each paired device gets its own key material.
  • In the keystore. Stored encrypted on-device, tied to your hardware.
  • Gone on unpair. Remove a device and its keys are wiped with it.

Zero telemetry

No analytics, no ads, no third parties. Nothing about you is ever sent anywhere.

There are no analytics SDKs, no ad networks and no crash-reporting that phones home. The app has nothing to send about you and nowhere to send it.

  • No third parties. No trackers, no ad libraries, no hidden SDKs.
  • Only your devices. Your clipboard and files go to the device you paired, nowhere else. The one other request the app makes is a version check against GitHub, which sends nothing about you.
  • Nothing to leak. No account and no profile means nothing to breach.
Cross-platform

Built for Android and Windows

Clipboard sync, file transfer, off-grid QR transfer and AES-256 work on both. A few abilities depend on the hardware each platform has.

Android

v3.7.6
  • Clipboard sync & file transfer
  • NFC & QR off-grid file transfer
  • Scan & receive via camera
  • Wi-Fi Direct & hotspot bridge
  • Quick-settings tile & share-sheet
  • System-tray (desktop only)

On phones, OffBridge is the full toolkit: every off-grid path plus the OS hooks only Android exposes.

  • On Google Play. Installs and updates from the Play Store; runs on Android 10 (API 29) and up.
  • Tap, scan, share. NFC hand-off, camera QR scanning and the system share-sheet are Android-only.
  • Push from the shade. A quick-settings tile sends your clipboard to the PC without opening the app.

Windows

v3.7.10
  • Clipboard sync & file transfer
  • QR off-grid sender
  • System-tray background app
  • AES-256 & verified pairing
  • NFC tap (no hardware)
  • Camera scan-to-receive

The desktop build runs quietly from the system tray and ships its own runtime, so there's no Java to install.

  • Installer, bundled runtime. A standard .exe for Windows 10/11 (64-bit); nothing else to set up.
  • Lives in the tray. Stays in the background and shows a QR code for off-grid sends.
  • Same crypto. AES-256 and verified 6-digit pairing, identical to the Android client.
Get it

Download OffBridge

It's free, with no account. Pick your platform; your device is highlighted below.

Builds are published for Android and Windows.

Questions

Good to know

Does it need an internet connection?

No. On the same Wi-Fi it goes direct over your LAN; with no network at all it creates its own link via QR, NFC, Wi-Fi Direct or a hotspot bridge. Your clipboard and files never route through the internet. The app does reach out for one thing, and only if it can: a version check that asks GitHub whether a newer build exists.

Does it use my mobile data?

It only reaches devices on your local Wi-Fi, and that traffic never crosses onto the internet, so it doesn't count against a data plan. It also can't discover devices over cellular — you need the same Wi-Fi, or an off-grid QR / NFC link.

Is my data uploaded anywhere?

Never. There are no servers and no account. Clipboard contents and files move straight between your devices, with keys stored only on your hardware. Over a shared network those bytes are AES-256-GCM sealed. On an off-grid QR or NFC link there is no network to share in the first place: the two devices talk directly to each other over a connection nothing else can join.

What is the 6-digit code?

It's a Short Authentication String derived from a secure key exchange. Both devices show the same number, and confirming they match proves you're connected to the right device and not an impostor.

How large a file can I send?

Multi-gigabyte transfers are supported, with live per-file progress. If the connection drops mid-transfer it resumes rather than starting over.

How do I install it?

Android installs from Google Play. The Windows version is a standard installer with a bundled runtime, so there's no Java to set up. It isn't code-signed yet, so Windows may flag it the first time; the next question covers what to do.

Windows blocked the installer or can't verify the publisher?

That's Windows reacting to the missing code signature, not to anything the app does. It shows up two ways. SmartScreen displays a blue “unknown publisher” notice you can pass with More info, then Run anyway. Smart App Control, a stricter Windows 11 feature that's switched on for some machines, can block it outright with “couldn't verify the publisher,” and by design it has no per-app override.

OffBridge is off-grid and has no account; it's simply an unsigned indie build with no reputation yet. It does sit in the system tray so it can receive transfers, which is the app doing its job rather than anything hidden. You can confirm any download against the SHA-256 on the Windows card above.

Two honest caveats. Smart App Control decides per file hash, so clearing one build does nothing for the next one. And the app is not code-signed yet, so we can't promise a date when a given release stops being flagged. If SmartScreen is all that's in your way, More info then Run anyway gets you through. If Smart App Control is on, there's no per-app override, and we'd rather you skip the install than switch the feature off.