Open SyncBy!App on any TV or projector. Scan the code with your phone. Your slides sync instantly, peer-to-peer. No cables, no accounts, no trace left behind.
How it works
No software to install, no account to create. Present from your own device in under 30 seconds.
Launch SyncBy!App on your projector, TV, or laptop. A QR code and a 4-character PIN will appear instantly.
Scan the code or type the PIN in your mobile browser. No apps to install — your phone is now the remote.
Select your PDF or images. They stay securely on your device, syncing to the big screen via WebRTC in real time.
Who it's for
Whether you're on a conference stage or in a client's boardroom, you maintain full control of your presentation.
Present from your phone regardless of the venue's setup. Stand anywhere, walk the stage, and control the pace effortlessly.
Show proposals on a client's screen without transferring files. Once closed, the session expires — leaving no trace of sensitive data.
Step away from the podium and engage your classroom. Load a PDF or photos and start presenting without USB drives or logins.
Run workshops smoothly in hotels and coworking spaces, focusing on the audience rather than wrestling with AV equipment.
Present securely on hospital screens without connecting devices to restricted networks or waiting for IT approval.
Walk clients through floor plans and high-res renders on any TV. Your materials remain strictly on your own device.
FAQ
Everything you need to know about privacy, technical details, and how the app works.
Privacy & Security
No — never, under any circumstances. Your PDF or images are loaded and rendered exclusively in your browser, on your device. Only rendered slide images in WebP format are transmitted to the receiving screen. The server acts solely as a connection relay — it never sees your presentation content, does not store it, and has no access to it.
Only anonymous usage statistics: number of sessions and device/browser type. We do not collect email addresses, file names, or any presentation content. IP addresses are hashed with SHA-256 before any use — we cannot link them to any individual. No tracking cookies, no third-party analytics.
Yes. All traffic is encrypted via TLS (HTTPS/WSS). In corporate environments where firewalls block direct P2P connections, the system automatically switches to WebSocket relay. No non-standard ports are required — the app works through standard 443 (HTTPS) and 80 (HTTP).
Enterprise & Terms
Yes — the core application is free to use with no hidden costs, no account, and no credit card required. Sessions are fully functional and last up to 3 hours. For organizations that need custom branding, unlimited sessions, and a self-hosted deployment on their own infrastructure, we offer an Enterprise license.
SyncBy!App is provided "as is", without warranties of uptime, availability, or fitness for a particular purpose. The service may be modified, suspended, or discontinued at any time without prior notice. You use the app at your own risk.
Technical details
The screen creates a session and displays a QR code with a unique 4-character PIN. The phone joins via WebSocket, then both devices establish a direct WebRTC DataChannel — an encrypted tunnel that bypasses the server. Slides are transmitted directly, peer-to-peer. If WebRTC is unavailable (e.g., on Smart TVs), everything automatically falls back to WebSocket relay with data chunked into ~40 KB pieces.
WebP offers the best quality-to-size ratio of any format supported by all modern browsers. A Full HD slide rendered from a PDF or image weighs just 80–200 KB after conversion — small enough for smooth transmission, large enough for text and graphics to look sharp on a big screen. All conversion happens locally in the presenter's browser.
The system automatically and silently switches to the WebSocket relay fallback. This happens without any user intervention, in a fraction of a second, without interrupting the presentation. SyncBy!App works reliably on corporate, hotel, university, and mobile LTE networks.
Practical questions
PDF and images (JPG, PNG, WebP) only, up to 256 MB in size. PDF preserves the exact appearance of your presentation regardless of operating system and installed fonts. PowerPoint, Keynote, and Google Slides files can be exported to PDF with one click directly from each application, without losing any formatting quality. You can also select a batch of photos to present a slideshow.
Sessions last up to 3 hours. Before each new presentation, simply start a fresh session on the target screen — the QR code appears instantly, with no login required.
Both devices need network access — even via one participant's mobile LTE. They don't need to be on the same local network; they just need to reach the SyncBy!App server via standard HTTPS/WSS traffic. A completely internet-isolated network will not work.