Guides

Practical, no-nonsense guides for files too big for email or chat apps — and for sending them without leaving a copy on anyone's server.

• How to send files securely

  A practical guide to sending files securely: what end-to-end encryption really means, why email and shared links fall short, and a simple step-by-step method.

• What is end-to-end encryption?

  End-to-end encryption (E2EE) explained in plain language: how it works, what it protects, how it differs from encryption in transit, and why it matters for file transfers.

• What is zero-knowledge (and why it matters for file sharing)?

  Zero-knowledge means a service is built so it cannot read your data — it never holds the key. Here is what that means in practice and how to tell if a tool really is zero-knowledge.

• How to send confidential documents

  How to send confidential documents — contracts, medical records, financial files — without leaving a readable copy on a server. A practical method for professionals.

• How to send large files securely

  How to send large files securely without uploading them to a server: the real size limits of email, transfer services and cloud drives, and how an end-to-end encrypted peer-to-peer transfer handles big files privately.

• How to send files securely by email

  Email attachments aren’t end-to-end encrypted and linger on mail servers. Here is how to send files securely by email — by sharing an encrypted link instead of the file itself.

• File Too Large to Email? Limits by Provider and What to Do

  File too large to email? Gmail, Outlook, iCloud Mail and Yahoo cap a message at 20–25 MB, and less of that is your file than you think. Every limit side by side, and how to send the file anyway.

• Gmail attachment size limit, explained

  Gmail caps attachments at 25 MB — and the real limit is lower once encoding is counted. Here is what the limit actually is, why the cloud link it offers instead isn’t private, and how to send a bigger file securely.

• Outlook Attachment Size Limit (Outlook.com, Microsoft 365, Exchange)

  Outlook.com caps an email at 25 MB; Microsoft 365 work accounts default to 35 MB sent and 36 MB received; Exchange Server defaults to 10 MB. What each limit really allows, and how to send a bigger file.

• How to send large files without uploading them

  Every mainstream transfer tool uploads your file to a server first. A peer-to-peer transfer skips that step entirely — the file streams browser to browser. Here is how it works and when it doesn’t.

• How to Send a 1GB File (Without Email or Cloud Storage)

  How to send a 1GB file: it is far past every email limit and awkward for most free transfer tools. The options that actually handle it, what each costs in privacy, and how to send it end-to-end encrypted.

• How to Send a Large Video File (iPhone, Android, Computer)

  How to send a large video file from an iPhone, an Android phone or a computer without it being compressed: send the original as a link, not through a chat app. Real size limits included.

• How to Send a Folder (With Its Structure Intact)

  How to send a folder: email only attaches files, and zipping by hand hides what you are sending. How to send a whole folder online with its tree intact, end-to-end encrypted.

• How to Send Files to Yourself Between Devices (No Cable, No Cloud)

  Move a file from your laptop to your phone, or between two computers, without a cable and without storing it in the cloud. How a direct transfer between your own devices works, and its limits.

• Cloud file transfer vs direct transfer: an honest comparison

  A cloud transfer uploads your file and keeps it online for days; a direct transfer streams it browser to browser and stores nothing. What each costs you, including when the cloud is the better choice.