HYPERBEAM Zero-knowledge P2P protocol Open app →

HYPERBEAM

Send files device to device, no cloud

Move files between devices without them ever sitting on anyone's server. No sign-up, no app to install, no size limit.

hyperbeam.pages.dev

1How to use it

Open the site on both devices, then take one role each.

↑ Sender

Open hyperbeam.pages.dev
Drop your files in, or tap the picker
Several files, or a whole folder, both work
You get a 6-digit code — read it out to the other person
Check the safety code matches, then send

↓ Receiver

Open hyperbeam.pages.dev
Switch to the RECEIVE tab
Type the 6-digit code you were given
Wait for the files, then hit Save

The opening screen with the drop zone and the file picker buttons — The first screen — drop files in or tap the picker · **Choose an entire folder** sends the whole tree

The receive tab with the six digit code field — Receiver's side — open the RECEIVE tab and type the 6-digit code

The sender's screen showing the six digit room code and a copy link button — Once files are picked you get a **6-digit code** — read it out, or copy the link and send that instead

The faster route — the sender taps “Copy link” and sends it over any chat app. The receiver opens it and the transfer starts immediately: no code to type, no confirmation step.

What that link really is — it carries the decryption key inside it. Whoever holds the link can take the files. Send it only to the person you mean to, and never post it anywhere public.

2The safety code — the one step to never skip

When the two devices connect, both screens show the same 6-digit number. Your job is to check that they match — over the phone, or by turning the screen around.

SENDER

847201

RECEIVER

847201

Same → safe, go ahead and send

SENDER

847201

≠

RECEIVER

335914

Different → someone is in the middle. Stop. Do not send.

The sender's screen with the green safety code and the confirm button — The real sender screen — the green number is the **safety code**. The send button only unlocks once you confirm the codes match

That number is derived from the secret key the two devices built together. Anyone sitting in the middle would hold a different key — so their number could never line up with yours.

If you joined by opening the link, this step is skipped for you: the link already proves who you are. If you joined by typing the 6-digit code, the sender is always made to confirm first.

3What it can do

Any file type, never compressed, never re-encoded
Many files at once, or a whole folder dragged in — nesting and structure survive
Any size — the only limit is free space on the receiving device
Works across platforms — Windows, Mac, iPhone, Android; a browser is all you need
Encrypted end to end, filenames included
If data is lost in flight, only the missing pieces are re-sent
Installs to your home screen like an app

A transfer in progress showing file count, speed and time remaining — Mid-transfer — shows **which file of how many**, plus speed and time left

The completed screen with a save button and a per-file list — All received — hit **Save File to Device** for everything at once, or save them one at a time

What it cannot do

Leave files waiting for later pickup — both sides must have the page open at the same time
Resume where it stopped — close the tab mid-transfer and it starts over
Get through some heavily restricted networks (certain mobile carriers) — the same Wi-Fi is the surest route

4About security

Question	Answer
Can the site owner see my files?	No — and not because of a promise not to look, but because it is not possible. Files travel straight from one device to the other and never pass through a server at all.
What does the server see?	The 6-digit room code and the technical handshake messages used to introduce the two devices. Not the files, not the filenames, not the sizes, not the key.
Could someone guess the 6-digit code and steal my files?	Very unlikely, and guessing right still gets them nothing: anyone who joins by typing a code cannot receive anything until the sender confirms. Measured for real, guessing runs at 0.8 tries per second — sweeping all million codes takes about 14 days, while a room only lives for minutes.
Is café Wi-Fi safe for this?	Yes. The data is encrypted twice over; anyone listening sees only ciphertext.
Do copies stay anywhere afterwards?	None on any server. Received files sit on the receiver's own device only, and are cleared when a new transfer starts or the page is closed.
Does the other person see my IP address?	Yes. Sending directly means both devices must know where to reach each other — this is true of every peer-to-peer system, video calls included. An IP roughly indicates your provider and region, not your name or address. Full detail on the privacy page.
What should I be most careful about?	The copied link contains the key. Send it only to the intended person, and for anything sensitive, always compare the 6-digit safety code.

5Common questions

How is this different from WhatsApp or Google Drive?

Those upload your file to their servers first, then the other person downloads it — two waits, and a copy living on someone else's machine. Here the file goes straight across: one wait, no copy left behind. Chat apps also re-compress photos and video; this does not touch the file at all.

Do we have to be on the same Wi-Fi?

No, but if you are, it is both the fastest and the most reliable.

What is the largest file I can send?

As much free space as the receiving device has. That is checked before the transfer starts, so you are told immediately — not at 98%.

Why doesn't a 5 GB file freeze my browser?

Because it is written to disk continuously as it arrives, instead of being piled up in memory first.

Do I need to keep the screen on?

The site asks your device to stay awake automatically, but do not switch to another app for long mid-transfer, especially on a phone.

Is it really free? Any catch later?

Really free, and it can be because the server never stores anything. What makes file-hosting expensive is storage and bandwidth, and both are zero here.

It failed. What now?

Put both devices on the same Wi-Fi, keep both screens on, do not switch apps, and try again. If it still fails, send a photo of the red error message — it carries the details of where it broke, including the version number.