You finish composing an email, click the attach button, select your file, and Gmail throws up an error: the attachment is too large. Frustrating, right? You are not alone. This particular roadblock catches a lot of people off guard, especially when sending presentations, design files, or video clips.
Gmail has had an attachment size cap for years. Most people bump into it at the worst possible moment, usually when they are on deadline. This guide explains exactly what the limit is, why it exists, and several reliable ways to get around it so you can send what you need without the headache.
What Is Gmail's Attachment Size Limit?#
Gmail allows attachments up to 25 megabytes (MB) per email. That applies whether you are sending from Gmail on the web, on Android, on iPhone, or through a third party email client configured with your Google account.
The 25MB limit covers the total size of all attachments combined in a single message, not just one file. If you attach two files and together they exceed 25MB, Gmail will reject the email.
There is one important caveat worth knowing: when Gmail sends or receives a message, it encodes attachments using Base64, which inflates the actual file size by roughly 33 percent. So in practice, a raw file of around 18 to 20MB will already push up against the cap after encoding. Keep that in mind when you are estimating whether a file will fit.
What About Receiving Large Attachments?
Gmail can receive messages with attachments up to 50MB in size. So while you cannot send a 40MB file directly, someone using a different email provider can send you one and Gmail will accept it.
That asymmetry catches people by surprise sometimes. The sending cap is 25MB, the receiving cap is 50MB, and neither cap has a workaround on the Gmail side itself. The file has to go through a different channel.
Why Does Gmail Have This Limit?#
Attachment limits exist for a few reasons, all tied to how email infrastructure works.
Storage costs. Email servers have to store every message, including every attachment. Without limits, a small number of users sending massive files could consume disproportionate server resources.
Deliverability. Large emails take longer to transmit and are more likely to be rejected or delayed by recipient mail servers. Many corporate email systems set their own caps even lower than Gmail's, sometimes as low as 10MB.
Security scanning. Gmail scans all attachments for malware and viruses. Extremely large files put more strain on those scanning systems.
None of this helps when you genuinely need to send a 50MB design file or a short product demo video. So let's get into the actual solutions.
How to Work Around the Gmail 25MB Attachment Limit#
There are several approaches depending on your situation. Some are quick fixes, others are better for recurring needs.
Option 1: Use Google Drive (The Built-In Solution)
Gmail and Google Drive are deeply integrated, and Google designed this integration specifically to handle large files. When you try to attach a file that exceeds 25MB, Gmail will actually prompt you to upload it to Google Drive instead and insert a link.
You can also do this proactively:
- Upload your file to Google Drive.
- In your Gmail compose window, click the Google Drive icon in the toolbar (the triangle symbol).
- Select the file you want to share.
- Choose whether to share a link or share as an attachment.
The recipient gets a link they can click to view or download the file. If the file is already in your Drive, sharing takes seconds. There are no size limits on what you can link to this way, as long as the file is within Google's storage policies.
One thing to keep in mind: if you share with "Anyone with the link," anyone who gets forwarded that email can access the file. For sensitive documents, share with specific people or use access restrictions.
Option 2: Compress the File
For many file types, compression can bring a file under the 25MB threshold without much quality loss.
For documents and spreadsheets: These usually compress well. Zip a folder of files or use your operating system's built-in compression to create a .zip archive.
For images: Tools like TinyPNG, Squoosh, or even the Preview app on Mac can reduce image file sizes significantly. A 30MB TIFF might compress down to under 5MB as a JPEG with acceptable quality.
For PDFs: Adobe Acrobat and free tools like Smallpdf or PDF2Go can compress PDFs by reducing image resolution embedded in the document.
For videos: Video files are notoriously large. HandBrake is a free tool that can dramatically shrink video files. Alternatively, upload to YouTube as an unlisted video and share the link.
Compression is not always practical and does not work well for already compressed files (like .mp4 or .zip), but for documents and images it is a fast option.
Option 3: Use a File Transfer Service
Several services exist specifically for sending large files over the internet, without using email attachments at all.
WeTransfer: Free tier allows transfers up to 2GB. You upload the file, enter the recipient's email, and they get a download link. Files expire after a week on the free plan.
Dropbox Transfer: If you already use Dropbox, this works similarly to WeTransfer. Free users get transfers up to 100MB; paid plans go higher.
Google Photos: For large photo collections or videos, Google Photos handles storage and sharing elegantly, though it is best suited for personal or creative contexts rather than business documents.
OneDrive: If the recipient is in the Microsoft ecosystem, sharing via OneDrive is a clean option similar to Google Drive.
These services work well for one-off large file transfers. For regular workflows where attachments are a constant part of your day, a more systematic approach makes sense.
Option 4: Split the File Into Multiple Emails
This is a last resort approach, and an annoying one, but it works in a pinch. File splitting tools like HJSplit (Windows) or Split and Concat (Mac) break a large file into numbered parts. You send each part as a separate email, and the recipient reassembles them.
This approach adds friction for both sender and recipient. It is only worth considering when you have no other option and the recipient is someone you work closely with.
Option 5: Use an Email Client That Supports Large Attachments Via SMTP
Some desktop email clients (like Thunderbird) let you configure separate attachment handling that routes large files through your own server or storage provider. This is a niche option suited for technical users who manage their own infrastructure.
The Attachment Problem Goes Both Ways#
A lot of conversations about Gmail's size limit focus on sending. But receiving large attachments creates its own set of problems.
When someone sends you an attachment, that file now lives in your Gmail inbox consuming Google account storage. If you receive a lot of large files over time, your 15GB of free Google storage (shared across Gmail, Drive, and Photos) fills up faster than you'd expect. This is why it pays to periodically find and delete the large attachments filling your storage before you hit the cap.
That's where the problem gets expensive: either pay for more storage through Google One, or spend time manually downloading and deleting attachments to free space.
Managing Gmail Attachments at Scale#
For anyone who regularly receives files through Gmail, whether contracts, invoices, design assets, or reports, managing those attachments manually becomes its own full time job.
This is exactly the problem Dioveo was built to solve. Dioveo connects to your Gmail account and can save large files to Drive automatically as they arrive, organized by sender, date, or label, or back up large files to Dropbox or OneDrive instead. You can set filters so that only certain file types or senders trigger the automation, and you can point different types of attachments to different folders in Drive.
The practical effect: your inbox stops acting as a file cabinet. Attachments land in the right place in Drive automatically, your Gmail storage stays manageable, and you can find any file in seconds without digging through old threads.
For teams that process high volumes of emailed documents, the time savings add up quickly.
Gmail Attachment Limits for Workspace Users#
If you use Gmail through a Google Workspace account (formerly G Suite), the attachment limits are the same as personal Gmail: 25MB for sending, 50MB for receiving.
Google Workspace admins do not have the ability to raise the attachment cap within Gmail itself. The workaround at scale is the same: use Google Drive links instead of raw attachments, or implement a document management workflow that routes files to Drive automatically.
Some enterprises use third party email security gateways that strip and re-host attachments before they reach end users. These systems effectively sidestep the Gmail cap but add complexity and cost. For most small and midsize teams, the Google Drive integration is the simpler path.
What About Gmail on Mobile?#
The 25MB sending limit applies equally on the Gmail mobile apps for iOS and Android. If you try to attach a file from your phone and it exceeds the cap, Gmail will offer to upload it to Drive and share a link instead.
On mobile, this is often the smoothest experience since most users have the Google Drive app installed. You can share directly from Drive to a Gmail compose window in a few taps.
Tips for Staying Under the Limit Consistently#
If you find yourself bumping into the attachment cap regularly, a few habits help:
Default to sharing via Drive. Instead of attaching files, get into the habit of saving to Drive first and then sharing links. It is more reliable, the recipient can access the latest version if you update the file, and you avoid the size limit entirely.
Compress before you attach. For anything you genuinely need to send as an attachment, run it through a compressor first. Many files can be reduced to a fraction of their original size with no meaningful quality loss.
Archive attachments out of your inbox. Use a tool to automatically move attachments to Drive so they do not pile up and consume your Gmail storage quota over time.
Know the real encoding limit. Remember that Gmail's encoding inflates file size by around 33 percent. So your practical safe limit for raw file size is closer to 18MB, not 25MB, if you want to avoid edge cases.
Frequently Asked Questions#
Can I increase my Gmail attachment limit?
No. Google does not offer a way for individual users or even Workspace administrators to raise the 25MB sending cap within Gmail itself.
What happens if I receive an email with an attachment larger than 50MB?
The sending server will typically bounce the message back to the sender with an error. Gmail will not receive emails with attachments over 50MB.
Does the 25MB limit apply to Google Drive links shared in Gmail?
No. The size limit only applies to file attachments. A Google Drive link in an email is just text; the file itself lives in Drive and has no Gmail attachment cap.
Can I send large attachments using Gmail SMTP?
The 25MB limit applies to all email sent through Gmail's servers, including via SMTP. You cannot bypass it by using a different send method.
Is the 25MB limit per attachment or per email?
It is per email, covering all attachments combined. Three 10MB files in one email will exceed the limit even though each individual file is under 25MB.
Conclusion#
Gmail's 25MB attachment limit is a real constraint, but it does not have to slow you down. For most use cases, switching to Google Drive links is the easiest and most reliable workaround. For one-off large transfers, services like WeTransfer fill the gap cleanly. And for recurring needs where attachments flow into your inbox constantly, automating the process with a tool like Dioveo keeps your storage manageable and your files organized without any manual effort.
The limit itself is unlikely to change. Google's email infrastructure is built around it, and the Drive integration is their intended solution. The sooner you build Drive links into your workflow, the less friction you will feel.
Ready to stop fighting the attachment cap and the storage bloat that comes with it? Manage large attachments with Dioveo and let it route every incoming file to the right place automatically.
