Send Confidential Files Securely
Every document has different security requirements. This page helps you quickly identify the protection solution that best fits your needs.
Whenever you share a document, you generally expect that only the intended recipient will be able to access it. Yet once a file is sent over the Internet, it often becomes difficult to maintain control over how it is accessed or shared.
Whether you're sending a personal, professional, or private document, it's only natural to decide who can access it, for how long, and under what conditions.
At OWL Transfer, we believe that sending a confidential file should never mean giving up its confidentiality.
OWL Transfer, August 2026
Why Isn't a Simple Download Link Always Enough?
Once a document has been downloaded, it can be:
- copied;
- forwarded;
- archived;
- shared with other people;
- stored indefinitely without your knowledge.
Depending on the nature of your document, this can represent a significant security risk. That's why OWL Transfer offers multiple levels of protection designed for different use cases, rather than a one-size-fits-all solution.
Choosing the Right Level of Protection
Not every document requires the same level of confidentiality. Some situations simply require a secure file transfer. Others require that nobody - not even the service provider - can technically access the contents of the file. In other cases, the priority is preventing downloads or identifying the source of a potential leak. OWL Transfer lets you choose the protection that best matches your needs.
Prevent Document Downloads
If your goal is to prevent recipients from keeping a local copy of your document, OneTimeView is the most suitable solution. The document is viewed directly in the browser, without being downloaded, using protection mechanisms designed to limit screenshots, screen recordings, and the most common methods of copying or extracting content.
→ Learn more about OneTimeViewMaximum Confidentiality
If your priority is ensuring that nobody can technically access your file's contents, OWL Transfer offers End-to-End Encryption based on the PGP standard. Files are encrypted directly on your device before they are uploaded and can only be decrypted by authorized recipients. Depending on the mode you choose, you can even keep your own private key, ensuring that nobody-not even OWL Transfer-can ever decrypt your documents.
Identify the Source of a Leak
No technology can prevent someone from physically photographing their screen. For this reason, OWL Transfer allows you to add a dynamic watermark directly to your documents. This watermark helps identify the origin of a potential leak while making unauthorized reuse significantly more difficult.
Add an Extra Layer of Legal Protection
Security is not only about technology. Before a document can be viewed, recipients can also be required to sign a Non-Disclosure Agreement (NDA). This provides an additional legal layer of protection that complements OWL Transfer's technical security features.
Which Protection Is Right for You?
We believe there is no single best way to protect every document. Different situations require different levels of protection. That's why OWL Transfer combines multiple complementary security technologies, allowing you to choose the protection that best fits your specific needs. Our goal is not simply to help you transfer files - it is to give you full control over who can access your documents, how they are viewed, and how they remain protected.
I just want to send a file quickly?
No additional options are required. Simply enter the recipient's email address and send your file. All transfers are automatically protected using HTTPS/TLS during transmission, while files are securely stored using AES-256 encryption.
I need to send a large file?
Every sharing mode available on OWL Transfer supports large file transfers. You can then choose the protection level that best fits your needs, whether it's OneTimeView, End-to-End Encryption or other security features.
I want to prevent my document from being downloaded, screenshotted, or screen recorded?
OneTimeView is the most suitable solution.
I want to ensure that nobody-not even OWL Transfer-can technically access the contents of my file?
Enable PGP End-to-End Encryption.
I want to identify the source of a potential leak?
Add a dynamic watermark to your document.
I want recipients to sign an NDA before viewing my file?
Require recipients to sign a Non-Disclosure Agreement (NDA) before they can access the file.
Why OWL Transfer?
We believe there is no single best way to protect a document.
That's why OWL Transfer combines multiple complementary technologies so that everyone can choose the right level of protection for their needs.
Our goal is not simply to help you transfer files - it is to give you full control over who can access your documents, how they are viewed, and how they remain protected.
Frequently Asked Questions
How can I send a confidential file securely?
The most important step is choosing a platform that allows you to control access to your document while providing the level of protection that matches your needs, such as OWL Transfer.
Can I send a confidential document by email?
Yes, but once the attachment has been downloaded, you generally lose control over how it is stored or shared. A dedicated secure file-sharing platform provides additional layers of protection.
How can I prevent someone from downloading my document?
Technologies such as OneTimeView allow documents to be viewed directly in a web browser without being downloaded.
What is the most secure way to send a file?
It depends on your requirements. For maximum confidentiality, PGP End-to-End Encryption is the most appropriate solution. If your priority is preventing downloads, OneTimeView is generally the better choice.
Can I send confidential files for free?
Yes. OWL Transfer allows you to send files for free while benefiting from several built-in security features. More advanced plans are also available for users with larger storage or security requirements.
What types of confidential files can I send securely?
You can securely share contracts, legal documents, presentations, financial records, PDFs, videos, business files, source code, or virtually any file containing sensitive or confidential information as long as it respects our general terms of use.
Is OneTimeView more secure than End-to-End Encryption?
No. They solve different problems. OneTimeView is designed to prevent downloads and make copying documents significantly more difficult. End-to-End Encryption is designed to ensure that nobody-not even OWL Transfer-can technically access the contents of your files. Only the recipients you have explicitly authorized, and who possess the appropriate decryption key, can decrypt and access the files.
Is OWL Transfer suitable for sharing confidential business documents?
Yes. OWL Transfer is designed to securely share contracts, legal documents, financial records, presentations, source code, PDFs, videos, and other confidential files. Depending on your security requirements, you can choose between secure transfers, OneTimeView, dynamic watermarks, NDA signing, or PGP End-to-End Encryption.