Will my file fit?
Gmail and Outlook.com both cap a message at 25 MB. Because attachments are encoded on the way, that holds just under 19 MB of actual file. Slack takes files up to 1 GB, and WhatsApp and Telegram up to 2 GB. Anything bigger needs a transfer link. Enter your file size to check every one at once.
| Service | Largest file | Fits? |
|---|---|---|
| GmailAbove 25 MB Gmail swaps the attachment for a Google Drive link. Source | 18.8 MB | No |
| Outlook.comThe 25 MB includes the message itself; OneDrive links can go up to 2 GB. Source | 18.8 MB | No |
| SlackPer file. Source | 1 GB | Yes |
| WhatsAppSent as a document. Sent as a photo or video, it is compressed. Source | 2 GB | Yes |
| TelegramPer file; 4 GB with Telegram Premium. Source | 2 GB | Yes |
| Yungle, freeA link, not an attachment: no account, kept 7 days. | 10 GB | Yes |
Limits from each company’s own help pages, checked 1 October 2026. Email limits are shown after base64 encoding, which adds about a third.
That fits in one free Yungle transfer: up to 10 GB, no account, kept 7 days. Send it with Yungle →
Questions
Ask us something elseWhy does a 20 MB file not fit in a 25 MB email?
Email carries attachments as base64 text, which makes them about a third larger. A 20 MB file becomes roughly 27 MB on the way, which is over a 25 MB limit. The recipient’s mail server may also have a lower limit you cannot see.
What is the easiest way to send a file that is too big?
Upload it to a transfer service and send the link instead. With Yungle that is up to 10 GB per transfer, free, with no account, and the link stays live for 7 days.
Where do these limits come from?
From each company’s own help pages, checked on the date shown under the table. Limits change; if one looks wrong, the source link next to it is the authority.
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