Send a video by email: why it fails, and what works instead
Gmail and Outlook cap at 25 MB, and encoding adds a third. The real limits, the bounce message, and the method that works at any size.
Short answer. A video will not go through as an attachment because mail providers cap the whole message at 25 MB — Gmail and Outlook.com alike. One minute of phone video already passes that mark.
There is no setting to change: the limit is not in your mail app, it is in the protocol. The one method that works at any size is to send a link instead of the file.
What your mail provider actually accepts
Checked at the source on 27 August 2026, on the providers' own help pages.
| Provider | Stated limit | What the limit covers |
|---|---|---|
| Gmail (personal account) | 25 MB | Attachments on sending |
| Outlook.com | 25 MB | The whole message: text, inline images and attachments |
| iCloud Mail, with Mail Drop | 5 GB | The file travels outside the message; 30 days to download |
| Corporate mail servers | often 10 MB | Set by the administrator, and frequently lower than yours |
Read the second column again: 25 MB is postcard territory, not video. And Outlook.com's cap covers the entire message — your text and your signature eat into it.
Why a 20 MB video is rejected by a 25 MB limit
This is the part official help pages leave out, and it is almost always the explanation. Email can only carry text. Your video therefore has to be rewritten as printable characters before it leaves: that is base64 encoding, which writes three bytes as four characters. The file grows by roughly 33 % in transit.
In practice: to fit under 25 MB, your video must be no larger than about 18 MB on disk. Under a 20 MB cap, count on 15 MB.
One more factor, and this one is invisible: the lower of the two limits wins — yours on sending, the recipient's on receiving. A corporate server often stops at 10 MB. Your message leaves, appears sent, and a bounce comes back an hour later:
552 5.3.4 Message size exceeds maximum permitted
One minute of video is already too much
This is where the misunderstanding starts: a video is not a big photo. It is measured as a rate — megabytes per second of footage — and the counter climbs fast.
One figure from Apple gives the scale. For ProRes RAW recording on iPhone, Apple states that one minute at 30 frames per second may use more than 10 GB, and more than 15 GB in HQ (Apple's ProRes support page, checked 27 August 2026). That is a professional format, not your holiday clip — but it shows the ratio: between what a camera produces and what email carries, there is a factor of several hundred.
Even at ordinary settings, a few minutes of phone video runs to hundreds of megabytes. The 25 MB limit is gone before the first shot ends.
The workarounds on offer, and what they cost
Every provider offers its own way out. None of them is free of consequences.
- Gmail's Google Drive link. Past the limit, Gmail uploads the video to your Drive and inserts a link. Two consequences: the recipient may hit an access request you have to approve by hand, and the video now lives in your free 15 GB — shared with Gmail and Photos. Once that quota is full, you stop receiving mail altogether.
- Mail Drop, on Apple. The most elegant of the three: up to 5 GB, without touching your iCloud storage, and the recipient has 30 days to download. But you have to send from Mail or iCloud.com, and past 5 GB the door closes.
- A transfer service. The right idea — as long as you read what you are signing. Free tiers cap low, usually want an account, and many ask for your recipient's email address so they can write to them on your behalf.
Send a link, with no account and no subscription
The method that works at any size is always the same: you do not send the file, you send its address. Email goes back to what it is good at — carrying a few lines of text.
toobigtoshare does exactly that, up to 2 TB. You drop the video in, you get a link, you paste it into your message like any other link. Whoever receives it clicks and downloads: no account to create, not for you, not for them. No email address is asked of you — neither yours nor theirs. Nothing is taken out of a quota, and the video deletes itself after 3 days, at a date and time shown up front.
And if the upload is cut off midway — several gigabytes takes a while — it picks up where it stopped instead of starting over.
Send the video with toobigtoshare — up to 2 TB, no account, a link to paste into your email.
Frequently asked questions
Can you send a video by email?
Only if it is under about 18 MB on disk, which is a few seconds of footage. Beyond that the message is rejected: Gmail and Outlook.com cap at 25 MB, and message encoding adds roughly 33 % to the file. The reliable method is to send a download link instead.
Why is my video rejected when it is smaller than the limit?
Because the limit applies to the encoded message, not to the file on your disk. Base64 encoding adds about a third to its weight. On top of that, the text, the signature and any inline images count against the same limit — as does the recipient's server limit, often lower than yours.
How do I send a video of several GB?
Not as an attachment, at any setting. Mail Drop accepts up to 5 GB from an Apple mail account. Beyond that you need a transfer service whose link you paste into the message: toobigtoshare accepts up to 2 TB with no account and no subscription.
Should I compress the video before sending it?
Compression buys you a factor of two or three, rarely more, and it is paid for in image quality. Getting from several hundred megabytes down to under 18 MB would degrade the video past the point of being useful. A link removes the trade-off.
A video too heavy for your mail provider?
toobigtoshare carries up to 2 TB. No account to create, not for you and not for the person receiving it: you get a link, you paste it into your email. $5.49 per transfer, file deleted after 3 days.