Your AI agents can run every profile through MCP — create, launch, check up and browse.
Nullprint is built for e-commerce sellers and social media teams that run many accounts. Every profile gets a fingerprint that is generated once and frozen for good. Time zone, language and geolocation follow your proxy's exit IP automatically, and a one-click check-up before launch tells you exactly what doesn't add up.
New accounts get a free 7-day Team plan trial: 500 profiles, 10 members, every feature included.
Install, sign up, add two proxies, create two profiles and check them — then see a US profile and a Japan profile open Amazon side by side, with nothing shared between them.
Loads only after you click play.
Platforms cross-check browser fingerprints, cookies and IP addresses. Overlap anywhere and your stores can be flagged as the same person — when one gets into trouble, the rest go down with it.
Ordinary browsers on the same computer report the same GPU, fonts and screen. Platforms can tell at a glance.
A US exit IP with a Chinese time zone and language is a red flag. Tweaking settings by hand often produces a computer that couldn't exist.
Staff share passwords and log in on their own. Nobody can tell who touched which store, and every staffing change adds risk.
Our own Chrome kernel, compiled from Chromium source (Chrome 155 bundled; 154 / 152 / 148 / 144 available on demand). Canvas, WebGL, audio, ClientRects and font metrics are noised per profile at the kernel level. Fingerprints are generated when a profile is created and stay the same across restarts.
Enter a proxy and Nullprint detects the exit IP, then sets time zone, language and geolocation to match — shown right in the new-profile window and recalculated whenever you change proxies. Profiles on the same computer are automatically assigned different GPU models.
Checks that exit IP, time zone, language and fingerprint overrides are consistent, then saves a Consistent / Warning / Mismatch result with the profile. Batch check-ups skip profiles that were already checked and haven't changed.
Select several profiles, launch them in one click and tile them across your screen. Turn on sync and clicks, scrolling and typing in the main window are mirrored to the others; you can also open the same URL in all of them. (Windows)
A built-in MCP server lets Claude, Codex and other MCP-capable AI agents create profiles, launch browsers and run check-ups. The local API runs on a fixed port with an API key, and scripts can attach to running browsers with Playwright. Read the MCP docs · Setup guide · API docs
Save a username, password and 2FA secret with each profile (stored in the system keychain; the profile page shows the live code). Import cookies, or export them one at a time or in bulk as JSON or Netscape format.
Bulk import from Excel / CSV, browser templates, profile cloning, extension management and a recycle bin; advanced options like launch arguments and custom DNS; dark mode; background downloads and delta updates for new versions.
Click Contact support in the app to open a ticket, attach screenshots and, with one tick, a diagnostic bundle (proxy addresses, API keys and credentials are stripped first). We reply within 1 business day, and you can follow the conversation in your account.
Create an account on the web in a minute, or skip the form and sign in with your Google account in one click. Plans, payments and support tickets are all in your online account.
The app, your online account and the developer docs all come in English and Simplified Chinese. Switch languages any time.
Download the Windows installer, then sign up or log in from the app. New accounts start a 7-day Team plan trial automatically.
Bring your own proxies — no provider lock-in. The fingerprint is generated for you, and time zone, language and geolocation follow the proxy's exit IP.
Run a check-up before launch and log in to your store once it says Consistent. Launch, tile and sync several stores at once.
Nullprint ships an open-source MCP server. Connect Claude Code, Claude Desktop, OpenAI Codex, Kimi or any MCP-capable agent, and it can create profiles, run check-ups, launch browsers and work inside them from a plain-language request. No extra plan, nothing leaves your computer.
claude mcp add nullprint -- uvx nullprint-mcp. Codex uses the same line; Claude Desktop and Kimi take a three-line mcpServers entry. Port and key are read from the running app automatically.
"Create 20 profiles from this proxy list and check each one." "Open shop-07 and read me the unfulfilled orders." The agent chains list, create, check-up, start, navigate, read and stop.
Permanent deletion is never exposed to agents, there are no file-writing tools, and every action goes through the same local API you can audit. Read the MCP docs
Nullprint is local software. Browser data is created and stored on your computer; our servers only handle accounts, subscriptions, the profile-config sync that team management needs and, if you turn it on, end-to-end encrypted cookie cloud sync.
Prices in USD. The Free plan is free forever. Start with a free 7-day Team plan trial and pay only when you're sure it fits.
New accounts get a free 7-day Team plan trial. When a trial or paid plan ends, your account moves to the Free plan for good (5 profiles, 1 member): only your 5 oldest profiles can be opened and the rest are locked — renew and they all unlock.
Each plan includes the members shown above. Need more? Extra members are $3 per member per month — contact support to add them. For more than 3,000 profiles, get in touch too.
Pay online from your account: cards, Alipay or WeChat Pay (processed by Stripe), or crypto (USDT via MixPay). Bring your own proxies — no provider lock-in.
What changed in this version? See the release notes →
Open the app, sign up or log in, and create your first profile. Installed copies download new versions in the background and prompt you to restart when an update is ready.
The Windows installer is digitally signed by HENGCHENG LLC; the macOS installer is signed by HENGCHENG LLC and notarized by Apple.
Apple silicon and Intel Macs, macOS 12 or later. macOS 12 uses the Chrome 148 kernel (Chrome 155 and 154 need macOS 13+). macOS 13 or later is recommended. Profiles you create on a Mac are macOS profiles. Not sure which chip you have? Apple menu → About This Mac: “Chip: Apple M1 / M2 / M3…” means Apple silicon; “Processor: … Intel …” means Intel.
Yes. Nullprint is an AI antidetect browser, also known as a multi-profile browser, and AI agents can operate it through MCP: each profile has its own fingerprint, cookies and proxy, so every store or social account runs in a separate, self-consistent browser environment.
Yes. Nullprint doesn't sell proxies or tie you to a provider. Any HTTP / SOCKS5 proxy (including ones with a username and password) can be imported into the proxy pool.
Windows 10 / 11 (64-bit); macOS 12 or later on both Apple silicon and Intel Macs. macOS 13 or later is recommended.
No. Your account moves to the Free plan for good. You can keep opening your 5 oldest profiles; the rest are locked but not deleted, and everything comes back when you renew. Member accounts are paused on the Free plan.
In your account, choose a plan and term (1 / 3 / 12 months) and pay online by card, Alipay or WeChat Pay, or with crypto (USDT). Your plan activates automatically once payment goes through.
Yes. The owner creates member accounts in Team management and grants access to groups or profiles. Members sign in with the same app on their own computers, and store sessions stay on their machines.
Usually an antivirus (on Chinese PCs typically 360 Security Guard or Tencent PC Manager) quarantined the freshly installed Nullprint.exe. Restore Nullprint.exe from the antivirus quarantine, add the install folder (by default %LOCALAPPDATA%\Programs\Nullprint) to its trusted list — or pause the antivirus before installing — then run the installer again. Both the installer and the app carry a valid HENGCHENG LLC code signature.
Nullprint builds Firefox profiles to match the real Firefox on your computer, so details such as fonts are the same as the official Firefox on that machine. On a Mac whose system language is Chinese, pixelscan shows “Masking detected” for the official Firefox itself, and a Firefox profile gets the same result as the official Firefox. Where checker results matter most, choose the Chrome engine for the profile.
Phone identities show pages at the phone screen width, so the window has blank space at the sides. The screen, viewport and pixel ratio that websites see all match the chosen phone model.
Phone identities work on Windows and Apple silicon Macs. For teams, create phone identities after everyone has updated to 0.2.27 or later.
We recommend using the free 7-day trial to make sure Nullprint meets your needs. See Refunds & Disputes for eligible refund requests. Crypto payments are non-refundable.
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