How to Send Large Files to Clients (3 Reliable Ways)

Somebody on your team has, at some point, tried to email a 40MB video file to a client, watched it bounce, then split it into three parts to get under the limit. There's a better way, and it's not complicated. How to send large files to clients comes down to picking the right link-based method and setting sane permissions, and this page walks through exactly how.

Why email attachments cap out where they do

Email wasn't designed to move large binary files — it was designed to move text, and attachments were bolted on later, encoded in a way that inflates their actual size by roughly a third. That's part of why a "20MB" file can fail to send even under a 25MB limit: the encoded version is bigger than the file on your disk. Google's own documentation on Gmail limits confirms the 25MB cap and explains that Gmail automatically converts larger attachments to Drive links when it can — a tacit admission that the underlying transport isn't built for big files.

Three reliable methods, compared

1. Cloud storage link (Google Drive, Dropbox, OneDrive). Upload the file, generate a shareable link, set permissions to view-or-download only. Best for files you'll want to reference again or update later, and for teams already using one of these platforms daily.

2. Dedicated transfer tool (WeTransfer, Smash). Built specifically for one-off large transfers, often with automatic expiry after a set number of days or downloads. Best for a single, one-time send where you don't need the file to persist anywhere afterward.

3. Client portal or CRM file share. Upload through the same system you manage the client relationship in, and the file becomes part of that client's record — accessible again later, permissioned automatically, and visible in your existing activity log. Best for ongoing client relationships where large files come up regularly, and it avoids the "which link did I send them" problem that accumulates with one-off transfer tools.

Step-by-step

1. Check the file size against your provider's limit. Gmail 25MB, Outlook.com roughly 20MB. If you're close to the line, go straight to a link rather than risking a bounce.
2. Pick a link-based method based on the table above — cloud storage for reusable files, a transfer tool for a single send, a portal if it's ongoing client work.
3. Set permissions and expiry. View-or-download only, and an expiry date if the file is confidential or time-bound. See how to share files with clients securely for the full permission checklist.
4. Send the link with context — what the file is, its size, and how long the link will remain active. A bare URL with no explanation looks like spam to a lot of recipients.
5. Confirm receipt and clean up. Ask the client to confirm the download worked, and revoke or let the link expire once it's no longer needed.

When compression actually helps

Compression is worth trying for PDFs, Word documents, spreadsheets and uncompressed images (BMP, TIFF) — these formats often shrink 30-70% with no visible quality loss. It rarely helps for formats that are already compressed: MP4 video, JPEG images, ZIP archives. If you're sending a large video file, re-encoding at a lower bitrate helps more than compression tools will, but that's extra work that's often not worth it compared to just using a link-based method that doesn't care about size.

For teams sending large files often

If large-file transfers to clients are a weekly occurrence rather than an occasional one, a one-off transfer tool becomes its own kind of clutter — a growing list of expired WeTransfer links you can't retrieve later, no record of what was sent to whom. This is exactly the case for moving to a persistent system, whether that's Dropbox alternatives for client files or a full client portal where large files sit alongside the rest of that client's record and stay retrievable months later.

The bottom line

Stop trying to shrink files to fit email. Pick the link-based method that matches how often you'll need this — cloud storage for reusable files, a transfer tool for genuine one-offs, a portal for ongoing client relationships — and set permissions and expiry deliberately rather than defaulting to a public link because it's the fastest option in the moment.

FAQ

See below.