Files Too Big for Email? How to Send Them Anyway
Gmail caps attachments at 25 MB, Outlook lower, and base64 encoding eats a third of that. Here is why email bounces big files and how to send them directly instead.
You finish the edit, attach the file, type a short note, and hit send. A second later the message bounces back: attachment size exceeds the allowable limit. The video is 180 MB. Your mail provider wants it under 25. So you start the ritual — zip it, try again, fail, upload it to a cloud drive, wait for the upload, copy a link, paste the link, and hope the other person can actually open it.
Email was never built to move files. It was built to move text. Here’s why the limits are what they are, what each workaround actually costs you, and how to just send the file.
Why email still chokes on big files
Email attachments don’t travel as files. They get encoded into the body of the message as text, using a scheme called base64, and that encoding inflates the data by roughly 33%. So a “25 MB limit” is not 25 MB of file — it’s about 18 MB of actual file once the overhead is counted. People hit this constantly: a 20 MB file gets rejected by a 25 MB limit and it looks like a bug. It isn’t.
Then there’s a second trap. Two limits apply to every message: yours and the recipient’s. Your provider has to accept the message on the way out, and their provider has to accept it on the way in. The smaller of the two wins. You can send a 25 MB attachment successfully and still have it rejected by a corporate mail server that caps at 10 MB — and the bounce message, if one arrives at all, often lands hours later.
Rough limits as they stand today:
- Gmail — 25 MB per message. Attach something larger and Gmail switches modes automatically, uploading the file to Google Drive and inserting a link instead of an attachment.
- Outlook.com — around 20 MB, with a OneDrive link offered above that. Microsoft 365 work accounts are commonly set to 25 MB, but administrators can raise or lower it, so your office limit may be smaller than you expect.
- iCloud Mail — 20 MB for a normal attachment. Apple’s Mail Drop handles up to 5 GB by uploading to iCloud and sending a link, which expires after 30 days.
- Yahoo Mail — 25 MB.
- Corporate Exchange servers — whatever IT decided. 10 MB is still common in regulated industries.
Modern files blew past all of these years ago. A minute of 4K video is far beyond any of them. So is a RAW photo set from a single afternoon, a design file with embedded assets, a database dump, or a Logic project with samples.
The workarounds, and what each one actually costs
Zipping the file
Sometimes worth trying, usually not. Zip compresses text, code, and spreadsheets well. It barely touches formats that are already compressed — MP4, MOV, JPEG, PNG, MP3, PDF with images. Zipping a 180 MB video might save you two megabytes. You’ll still be over the limit, and now the recipient has an extra step.
Splitting it into parts
Archive tools can split a big file into 20 MB chunks sent across several emails. It works, technically. It’s also fragile: if one part is lost, mangled by a mail filter, or opened with the wrong tool, the whole set is useless — and the recipient needs software that can reassemble it. A last resort, not a plan.
Cloud drive links
Google Drive, OneDrive, and Dropbox are the default answer, and for genuinely shared long-term documents they’re the right one. For a one-off handoff they add real friction: you wait through a full upload, then the recipient waits through a full download. You’ve moved the file twice across the internet to get it across a room. Permissions are the other headache — “you need access” is the most common reply to a Drive link ever sent. And the file now lives on a third-party server until you remember to delete it.
Mail Drop
Smoother than most because it’s built into Mail, and 5 GB is generous. But it’s Apple-only on the sending side, it still uploads everything to iCloud first, and the link dies after 30 days whether the recipient grabbed the file or not.
WeTransfer-style upload sites
Fast to start, no account needed for small transfers, and the link is easy to share. The trade is the same as any upload service: your file sits on someone else’s server, free tiers cap the size, and the link expires on their schedule, not yours. If the content is a client’s unreleased material or anything with personal data in it, “uploaded to a stranger’s server for a week” is a real consideration and not a paranoid one.
The pattern behind all of them
Every option above solves the size problem the same way: by making a copy of your file on a server in the middle. Upload, store, download. That’s why they’re slow, that’s why they expire, and that’s why they involve accounts and permissions.
But when you’re sending a file to your own laptop, or to a colleague sitting across the table, or to a friend on the same Wi-Fi, there is no reason for the file to visit a data center at all. It only has to travel a few metres.
Send the file directly instead
That’s the approach Likz Drop takes. It’s a free peer-to-peer transfer app for Windows, macOS, Android, and iPhone that moves the file straight from one device to the other, with no upload step and no size cap imposed by an inbox.
On the same Wi-Fi, it just finds the other device. Open the app on both, pick the nearby device, send. The transfer runs over your local network at whatever your Wi-Fi can actually do — nothing is throttled by an upload pipe, because nothing is being uploaded.
No Wi-Fi at all? Android and iPhone can send to each other directly with no router and no internet connection. Useful on a plane, in a car, at a venue with hostile guest Wi-Fi, or anywhere the network is the problem.
Different networks entirely? Send to someone by nickname. They can be on another Wi-Fi, in another city, on mobile data — pick their nickname and send.
Recipient doesn’t have the app? Share a browser link. They open it in any browser and download, no install and no account. The important detail: that link is private and only alive while you’re still sharing it. Stop sharing and the link is dead immediately — it’s not a copy sitting on a server for the next 24 hours or the next 30 days waiting to be found. That’s the opposite of how upload services work, and it’s the point.
Everything is end-to-end encrypted with ChaCha20-Poly1305, with keys derived using BLAKE3, so the contents aren’t readable in transit. Guest mode means you can send without creating an account. And transfers resume rather than restarting from zero if the connection drops mid-send — which matters a great deal when the file is 40 GB and not 40 MB.
Likz Drop is free forever for personal, school, and charity use — not free during a beta, free. Commercial use, meaning work you’re paid for or work that serves your business (sending media to clients, delivering paid work, sharing files with teammates), is the Pro plan at $20 per user per month or $200 per user per year. Full details are on the pricing page.
Which method should you actually use?
- Under ~18 MB, going to one person, needs a paper trail — just email it. Email is fine at what email is good at.
- A living document several people will edit over months — a cloud drive link is the right tool. Don’t fight it.
- A big one-off handoff: video, RAW set, project folder, backup — send it directly. It’s faster, there’s no upload wait, and no copy is left behind on a server.
- Recipient is standing next to you — direct transfer, every time. Uploading a file to the cloud so it can come back down to a laptop two feet away is a lot of internet for no reason.
If the last two describe most of your week, download Likz Drop and try it on the next file that gets bounced.
FAQ
What’s the biggest file I can actually attach to an email?
Plan for about 18 MB of real file, even when your provider advertises 25 MB — base64 encoding adds roughly a third to the size in transit. And remember the recipient’s mail server has its own limit, which may be lower than yours. If the file is anywhere near the cap, use something other than an attachment.
Can I split a large file across several emails?
You can, using an archive tool that creates multi-part archives, but it’s the least reliable option available. Every part has to arrive intact, the recipient needs compatible software to rejoin them, and spam filters treat multi-part archives with suspicion. A direct transfer sends the file once, as one file, with nothing to reassemble.
How do I send a big file to someone who won’t install anything?
Use a browser link. In Likz Drop you share a private link that the recipient opens in any browser to download — no app, no sign-up on their end. The difference from an upload service is that nothing was uploaded: the file is served straight from your device, and the link stops working the moment you stop sharing.
Next step: Share by link · Download