You try to send an important document to a client in Trois-Rivières, and your email immediately bounces back with an error message: attachment too large. It happens to everyone, from individuals to SMEs in the Mauricie region, who share plans, videos, high-resolution photos, or large presentations.
The good news is that you no longer need to split a file into multiple parts or compress it to the point of damaging it. Today, there are several free and reliable ways tosend a large file without overloading the recipient's inbox. Here are the methods we recommend to our clients, from the simplest to the most secure.
Quick answer: To send a large file by email, the easiest way is to upload it to OneDrive or Google Drive and then share a link instead of attaching the file. For a one-off send without an account, a temporary file transfer service will do the trick. In a corporate environment, SharePoint or a private vault remains the most secure option.
1. Why is your email rejecting large files?
Almost all email providers impose a limit on attachment size. Outlook and Microsoft 365 typically block emails larger than 25 MB, and Gmail applies the same 25 MB limit. Even if your provider allowed larger attachments, there's no guarantee the recipient's inbox would accept them. As a result, the message bounces or gets stuck and never arrives.
Several reasons explain these limitations:
- An attachment is encoded for transport, which inflates its actual size by about 30% during sending.
- Email servers are not designed to store large files, unlike cloud services.
- Large files slow down the entire chain and increase the risk of spam filters.
The solution, therefore, is not to force the attachment, but to share a link to the file hosted elsewhere. This is exactly what the methods below do.
2. OneDrive: the simplest method if you have Microsoft 365
If your small business already uses Microsoft 365, you have everything you need. OneDrive lets you upload a file and simply send a link, regardless of size. The recipient clicks, downloads, and your inbox stays clean.
To send a large file with OneDrive:
- Drag your file into OneDrive (via File Explorer or the website).
- Right-click on the file, then choose Share.
- Adjust the permissions (read-only, or edit) and the validity period of the link.
- Copy the link and paste it into your Outlook email.
You can even attach a OneDrive file directly from Outlook: instead of sending a copy, Outlook offers to insert a shared link. It's faster and cleaner. If your business isn't yet fully set up on Microsoft 365, our IT services for small and medium-sized businesses can get everything properly connected, including security.
3. SharePoint and Teams for team sharing
When multiple people need to access the same large file, individual links quickly become cluttered. SharePoint and Microsoft Teams are designed precisely for this: you upload the file to a shared library, and the entire team accesses it from the same location, with a single, up-to-date version.
The advantages for a small or medium-sized enterprise (SME) in Quebec City or the Mauricie region:
- No more multiple versions of the same document circulating by email.
- Access rights are managed by person or by group.
- The change history is saved, which helps in case of an error.
- External clients can receive a protected link without having access to the rest.
This is the ideal method for recurring files (catalogs, plans, templates) rather than for a one-time upload. To structure everything properly, planning your cloud environment makes a big difference.
4. Temporary transfer services (without an account)
Need to send a single large file to someone but don't want to create an account? Temporary file transfer services are perfect for this. You upload the file, get a link, and the recipient downloads it before the link expires (often after a few days).
These tools are useful for one-off submissions, such as a promotional video or a photo album. However, some precautions are necessary:
- Avoid them for confidential documents (contracts, client files, personal information).
- Check if the service offers password protection on the link.
- Remember that the file is being routed through a third-party server, often located outside of Canada.
For occasional and non-sensitive use, it's quick and efficient. For enterprise data, we revert to methods 2, 3, and 6.
5. Compress the file before sending it
Sometimes your file barely exceeds the limit. In this case, compression may be sufficient and allow you to senda large file directly as an attachment, without using a link.
On Windows 11, it's integrated:
- Select the file(s) to compress.
- Right-click, then Compress to ZIP file.
- A smaller .zip file appears, ready to be attached to the email.
Compression works very well for Office documents, PDFs, and text files. However, it doesn't significantly reduce the size of photos, videos, and music, which are already compressed. For these formats, it's better to share a link. Another tip: for a PDF that's too large, a dedicated PDF compression tool can often reduce the file size without compromising readability.
6. Sharing securely: what to check
Sending a large file is one thing. Sending it securely is another, especially when it contains customer information or company data. The Canadian Centre for Cyber Security recommends a few simple best practices for file sharing.
- Protect the link with a password when possible, and transmit this password through another channel (text, call).
- Limit the validity period of the link so that it does not remain accessible indefinitely.
- Restrict rights to read-only if the recipient does not need to modify the file.
- Opt for Canadian hosting or hosting controlled by your company for sensitive data, which also helps with Bill 25.
For an SME, the best approach is to centralize file sharing in an environment you control rather than scattering your files across free services. If you're unsure about your current setup, talk to our team: a quick review can prevent many data leaks.
Frequently Asked Questions
What is the maximum size for an email attachment?
Most email providers, including Outlook, Microsoft 365, and Gmail, limit attachments to around 25 MB. Beyond that size, the email may bounce. The best solution is to share a link to the file hosted on OneDrive, SharePoint, or another cloud service.
How do I send a video that's too large by email?
Videos almost always exceed the attachment limit. Upload the video to OneDrive or Google Drive, then send the sharing link. For a one-time, non-confidential send, a temporary file transfer service also works very well.
Is it safe to use a free transfer service for confidential documents?
For sensitive documents, it's best to avoid free services, as the file is often routed through a third-party server located outside of Canada. Opt instead for password-protected sharing within an environment you control, such as SharePoint or a corporate vault.
Need help sharing your files in Trois-Rivières?
Sending large files is easy when your environment is properly configured, but a real headache when it isn't. Whether you're in Trois-Rivières, elsewhere in the Mauricie region, or anywhere in Quebec, our team can set up fast and secure file sharing, integrated with Microsoft 365 and compliant with your requirements. Discover our IT services for SMEs or contact us to discuss your needs without obligation.