Email has a size limit, and most services stop accepting attachments around 20 to 25 megabytes
Gmail, Outlook, Yahoo Mail, and most workplace email systems reject attachments larger than 20 to 25 MB. A single high-resolution photo or a PDF with many images can hit that limit fast. A video file will exceed it almost when ready. When your attachment is too large, the email bounces back with an error message, and the recipient never sees it.
You have three real options: compress the file, use a file-sharing service, or split the document into smaller pieces. Which one makes sense depends on what you're sending, who you're sending it to, and how much control you want to keep over the document after it leaves your inbox.
Key Takeaways
- Most email services reject attachments over 20 to 25 MB, so you need an alternative method for anything larger.
- Compressing a file reduces its size but may lower image quality or make it harder to edit later.
- File-sharing services like Google Drive, Dropbox, or OneDrive let you send a link instead of an attachment, and you can revoke access or delete the file anytime.
- Cloud storage services vary in how they handle privacy: some encrypt files end-to-end, others can read your files, so check the service's privacy policy before uploading sensitive documents.
- Splitting a document into multiple emails works but creates confusion and makes it straightforward for the recipient to lose a piece.
Compressing files to fit email size limits
Compression shrinks a file by removing redundant data or lowering quality. On Windows, right-click the file, select "Send to," then "Compressed (zipped) folder." On Mac, right-click and choose "Compress." This creates a new .zip file that is usually 30 to 50 percent smaller than the original.
Compression works best for documents with text and straightforward graphics. It works poorly for photos and video, because those formats are already compressed. Zipping a JPEG or MP4 file saves almost no space. If you compress a PDF with many high-resolution images, the file shrinks, but when the recipient opens it, the images may look blurry or pixelated.
The real drawback is that once you send a compressed file, you lose control of it. The recipient can extract it, edit it, and share it with anyone. If the document contains sensitive information — a contract, medical records, financial statements — compression alone does not protect it.
Using cloud storage to send links instead of files
Google Drive, Microsoft OneDrive, Dropbox, and similar services let you upload a file once, then send a link to anyone. The recipient clicks the link and views or downloads the file. You stay in control: you can revoke access at any time, delete the file, or change whether the recipient can edit it.
To send via Google Drive: upload the file to your Drive, right-click it, select "Share," choose who can access it (specific people, anyone with the link, or public), and copy the link. Send that link in an email instead of the file itself. The recipient does not need a Google account to view it, though they may need one to read it depending on your settings.
OneDrive and Dropbox work the same way. The advantage over email attachment is that the file lives in one place. If you need to update it, you change the version in the cloud, and everyone with the link sees the new version. You do not have to resend it.
The privacy trade-off matters here. Google Drive, OneDrive, and Dropbox all scan files for viruses and other threats, which means their servers can read your documents. If you are sending a contract, tax return, or medical record, check the service's privacy policy. Some services offer end-to-end encryption, which means only you and the recipient can read the file — the company itself cannot. Tresorit and Sync.com offer this. Standard Google Drive and OneDrive do not.
Understanding the privacy difference between services
When you upload a file to Google Drive or OneDrive, Google and Microsoft can see what is in it. They use that access to scan for malware, to train their AI systems, and to show you relevant ads. Their privacy policies say they do not sell your documents to advertisers, but they do process them. If you are sending a sensitive document and that bothers you, use a service with end-to-end encryption instead.
Tresorit, Sync.com, and Proton Drive encrypt files on your device before they leave it. The company's servers store the encrypted file, but cannot read it. Only someone with the decryption key — you and anyone you share the link with — can open it. The trade-off is that these services cost money (usually $5 to $15 per month) and are less convenient than free options. They also cannot scan your files for viruses, so malware could theoretically hide in an encrypted file.
For most people sending a work document or a photo album, Google Drive or OneDrive is fine. For tax returns, medical records, or legal documents, an encrypted service is worth the cost and the extra steps.
How to set up a file-sharing link with the right permissions
When you share a file, you choose what the recipient can do with it. In Google Drive, the options are "Viewer" (they can only look at it), "Commenter" (they can add notes but not change the document), and "Editor" (they can change it). Choose "Viewer" for documents you do not want edited. Choose "Editor" only if you want the recipient to make changes and send it back.
You can also choose who sees the link. "Specific people" means only the email addresses you list can access it. "Anyone with the link" means anyone who has the URL can view it, even if you did not send it to them directly — useful for sharing with a group, risky if the link gets forwarded to someone you did not intend. "Public" means it shows up in search results, which you almost never want.
OneDrive and Dropbox have similar controls. The key is to set permissions before you send the link, not after. Once the link is out, changing permissions takes effect when ready for everyone who has it.
When to split a document across multiple emails
Splitting a large file into smaller pieces and sending them in separate emails is the slowest and most error-prone option. It works only if the recipient can reassemble the pieces, which requires them to understand the file format and have the right software. Most people cannot do this.
The only real reason to split is if you are sending to someone with a very restrictive email system that blocks file-sharing links and has an unusually low attachment limit. Even then, ask first. Sending five emails with fragments of a document creates confusion, and the recipient will almost certainly lose one piece or open them out of order.
Choosing between compression, cloud storage, and splitting
| Method | Best for | Privacy trade-off | Recipient needs |
|---|---|---|---|
| Compression (.zip) | Files under 20 MB that are not sensitive | No control once sent; recipient can share freely | Ability to extract .zip files |
| Google Drive / OneDrive | Any file size; work documents; photos | Company can read the file; free and convenient | Web browser; no account required |
| Encrypted cloud (Tresorit, Sync.com) | Tax returns, medical records, contracts | Company cannot read the file; costs money | Web browser; may need account |
| Splitting across emails | Almost never; only if other options blocked | Recipient loses control and may lose pieces | Manual reassembly; high error rate |
Frequently Asked Questions
What if the recipient's email system blocks file-sharing links?
Some workplaces block Google Drive and Dropbox links for security reasons. Ask the recipient what they can receive. If links are blocked, compression or splitting may be your only option. Some organizations allow certain services but not others — OneDrive might work when Google Drive does not.
Can I password-protect a file before sending it?
Yes. Most cloud services let you set a password on a shared link, so only someone who knows the password can access it. You send the link in one message and the password in a separate message, so they are not together. This adds a layer of security without requiring the recipient to use encryption software.
What happens if I delete a file from cloud storage after I share the link?
The link stops working when ready. The recipient can no longer access it. This is useful if you share a document by mistake or want to revoke access later. Be careful not to delete it before the recipient has downloaded a copy if they need to keep it.
Is it safe to use a free file-sharing service for sensitive documents?
Free services like Google Drive and Dropbox are find in the sense that they use encryption in transit and have strong security practices. The privacy question is whether you are comfortable with the company reading your files. For tax returns or medical records, an encrypted service is safer because the company cannot read them, even if they wanted to.
How long does a shared link stay active?
By default, links stay active until you delete the file or revoke access. You can set an expiration date in most services — for example, the link stops working after 7 days. This is useful if you are sharing something temporary and want to make sure it does not stay accessible forever.