To send big files, there are various online services designed for large file transfers with different features and size limits:

• Smash allows sending large files up to 50 GB for free by simply dragging and dropping files and then sending a link or email. It offers password protection, expiry dates, and notifications.

• Filemail lets you send large files up to 5 GB for free without an account, offering secure sharing with end-to-end encryption and fast transfer speeds. Paid plans allow unlimited sizes and additional features.

• WeTransfer offers a free basic plan to send files up to 2 GB quickly via email or a shareable link, suitable for creatives.

• pCloud provides up to 5 GB file transfer for free, with a focus on media file playback and security features.

• TransferNow supports sending files up to 250 GB per transfer without registration.

• SendBig allows free transfers up to 5 GB without an account and 30 GB with a free account, with resumable uploads and password protection.

• Dropbox Transfer lets you send files up to 100 GB via a shared link.

• Other general methods include compressing files or using cloud storage services like Google Drive or OneDrive.

These services generally work by uploading your file to their servers and providing a download link or sending an email notification to recipients for easy downloading. For very large files (10 GB or more), services like Smash, TransferNow, and SendBig are good options without size limits or with very high limits. Free plans come with some limitations on file size and storage time, while paid subscriptions offer extended capabilities. In summary, sending big files can be achieved easily using specialized file transfer services with free tiers allowing from 2 GB up to 50 GB or more depending on the platform used. Just upload your file, create a shareable link or email it directly, and your recipient can download the file without hassle.