Firefox Send

You are in a hurry. A massive video file needs to go to a client, but the upload bar is crawling. Your email attachment limit is a hard wall. You need to send a 2GB project file to a collaborator in Tokyo, but your local cloud drive is full and throttling your speed. This is the exact moment you need Firefox Send. This mobile tool is a zero-friction, end-to-end encrypted file transfer service that lets you bypass the limits of standard email and cloud storage. It is designed for one specific job: moving large files from point A to point B with maximum speed and minimum setup.

Core File Transfer Mechanics

Firefox Send operates on a simple principle: upload a file, generate a secure link, and send it to your recipient. The service handles files up to 2.5GB in size, which immediately eliminates the constraints of most email services (which cap at 25MB) and free cloud storage tiers. The process is stateless; you do not need to create an account to send a file, though you can log in with a Firefox account to manage your transfers. Once the file is uploaded, the app generates a unique, cryptographically random URL. You can then copy this link to your clipboard, share it via SMS, email, or any messaging app, or generate a QR code for instant scanning by the recipient. The recipient opens the link in their browser, and the file begins downloading directly from the Mozilla server. There is no software installation required on the receiving end—just a modern web browser.

Key Security & Data Control Features

• End-to-end encryption ensures the file is encrypted on your device before upload and can only be decrypted by the intended recipient using the link.
• Automatic file expiration gives you precise control over access; you can set the link to expire after 1 download, 20 downloads, or after a specific time window (5 minutes to 7 days).
• Password protection adds an extra layer of security, requiring the recipient to enter a custom password before they can download the file.
• Zero-access server architecture means Mozilla never has the decryption key; even if the server is compromised, the file contents remain unreadable.
• Real-time transfer status shows you the upload speed, estimated time remaining, and a visual progress indicator for both upload and download phases.

Technical Performance & Platform Integration

The application leverages native Android download managers for reliable file retrieval. It supports background uploading, allowing you to close the app or switch tasks while a large file transfers. The interface is built on a material design framework, providing a clean, two-step workflow: select a file, then configure the expiration and password settings. The app integrates directly with the Android share sheet, meaning you can select a file from any source (gallery, file manager, or third-party app) and choose "Send with Firefox" as the action. For power users, the app supports multi-file selection, allowing you to bundle several documents, images, or videos into a single transfer link. The upload process uses chunked transfer encoding, which is resilient to network interruptions; if the connection drops, the upload resumes from the last successful chunk rather than starting over.

Download Firefox Send mobile app now to eliminate file size limits and send sensitive data with guaranteed encryption.

Internet connection required for file upload and download. No in-app purchases; service is provided free of charge.