Email has size limits, so you need a different method for files over 20 to 25 megabytes

Most email providers cap attachments at 20 to 25 megabytes. Gmail allows 25 MB, Outlook allows 20 MB, and Yahoo Mail allows 25 MB. If your file is larger, the email will bounce back with a delivery failure message. You have three practical routes: compress the file to make it smaller, use a file-sharing service that email can link to, or split the file into smaller pieces and send multiple emails.

The easiest method depends on what you are sending and who you are sending it to. A video file or design project usually cannot be compressed without losing quality, so a sharing link works better. A folder of documents or photos can often be zipped down enough to fit. If the recipient needs the file immediately and cannot access a link, splitting and sending multiple emails is the slowest but most reliable option.

Key Takeaways

  • Gmail, Outlook, and Yahoo Mail all cap attachments between 20 and 25 megabytes, so files larger than that will not send.
  • Compressing a file into a ZIP folder reduces its size but works best for documents and photos, not video or already-compressed files.
  • File-sharing services like Google Drive, Dropbox, and OneDrive let you email a link instead of the file itself, with no size limit.
  • Splitting a large file into smaller pieces and sending multiple emails works but requires the recipient to reassemble them afterward.

Compressing files into a ZIP folder

Zipping reduces file size by removing redundant data. On Windows, right-click the file or folder, select "Send to," then choose "Compressed (zipped) folder." Windows creates a new ZIP file in the same location. On Mac, right-click the file, select "Compress," and a ZIP file appears. The compressed version is usually 30 to 50 percent smaller, though this varies by file type.

Compression works well for folders of documents, spreadsheets, and photos. Video files, PDFs, and image files that are already compressed gain little or nothing from zipping. If your 30 MB folder of Word documents compresses to 18 MB, you can email it directly. If your 50 MB video file compresses to 48 MB, you still cannot send it by email and should use a sharing service instead.

The recipient receives a ZIP file and must unzip it to use the contents. On Windows, right-click the ZIP file and select "Extract All." On Mac, double-click the ZIP file and it unzips automatically. This adds one extra step for them, but the file arrives in their inbox without needing an account or link.

Using Google Drive, Dropbox, or OneDrive to share a link

File-sharing services store your file on their servers and let you email a link instead of the file itself. There is no size limit — you can share a 5 GB video file this way. The recipient clicks the link, views or downloads the file, and you keep control over who can access it and for how long.

Google Drive is free with a Google account and gives you 15 GB of storage. Upload your file, right-click it, select "Share," and choose who can access it. You can set the link to "Anyone with the link can view" so the recipient does not need a Google account. Copy the link and paste it into your email. Dropbox and OneDrive work the same way — upload, share, copy the link, and email it.

The recipient does not need to create an account to download the file, though they may need one to view it in the browser depending on your sharing settings. This method is fastest for large files and works across all email providers without hitting size limits. The downside is that the file lives on someone else's server, and you need to remember to delete it later if you want it removed.

Splitting a file into smaller pieces

If the recipient cannot access a link and the file will not compress, you can split it into multiple smaller files and send them in separate emails. On Windows, use 7-Zip (free software) or WinRAR to split a file. Right-click the file, select "7-Zip," then "Add to archive." In the dialog, set the archive format to "7z" and enter a split size of 15 MB. 7-Zip creates multiple files named filename.7z.001, filename.7z.002, and so on.

On Mac, the Archiver app or Keka can split files the same way. The recipient receives all the pieces and must reassemble them using the same software. This method works but is slow and error-prone — if one piece fails to send or arrives corrupted, the recipient cannot reassemble the file.

Use this method only when the recipient specifically cannot use a file-sharing link and the file will not compress. It requires the recipient to have the right software installed and to follow reassembly steps correctly, which makes it the least reliable option for most situations.

Choosing between methods based on file type

Video files should go through a sharing service. Video is already compressed, so zipping saves almost nothing. A 100 MB video file zips to 98 MB and still cannot be emailed. Google Drive, Dropbox, or OneDrive takes seconds and works reliably.

Folders of documents, photos, or spreadsheets can often be zipped. A folder with 50 Word documents and 100 JPG photos might compress from 80 MB to 40 MB, which fits in email. Try zipping first — if the result is still too large, use a sharing service instead.

Large design files like Photoshop projects or video editing timelines should use a sharing service. These files are complex and do not compress well. A 200 MB Photoshop file zips to 190 MB and still will not send. Your recipient also needs the same software to open it, so a sharing link is clearer than an attachment.

What to do if the email bounces back

If you send an email with an attachment that is too large, your email provider will send you a delivery failure message within a few minutes to a few hours. The message says the attachment exceeded the size limit. The email does not reach the recipient, and you need to resend it using a different method.

Do not try to send the same email again — it will bounce again. Instead, compress the file, use a sharing service, or split it into pieces. If you compressed it and it still bounced, the compressed size is still too large and you need a sharing service. Send a new email to the recipient explaining the change in method and providing the link or the first piece of the split files.

Frequently Asked Questions

Can I send a file larger than 25 MB if I use a different email provider?

No. All major email providers — Gmail, Outlook, Yahoo Mail, Apple Mail — cap attachments between 20 and 25 MB. Some business email systems allow larger attachments, but consumer email does not. A file-sharing service is the only way to send truly large files by email link.

Will the recipient need an account to download a file I share from Google Drive?

Not if you set the sharing permission to "Anyone with the link can view." They can click the link and download the file without signing in. If you restrict it to specific people or require a Google account, they will need to sign in first.

What happens if I split a file and one piece fails to send?

The recipient will not be able to reassemble the file. They need every piece to reconstruct it. If one email bounces or arrives corrupted, the whole process fails. This is why file-sharing services are more reliable for large files — they send one link instead of multiple pieces.

Does compressing a file make it lower quality?

ZIP compression does not reduce quality for documents, spreadsheets, or photos. The file unzips to its original state. Video and audio files that are already compressed (MP4, MP3) gain almost nothing from zipping because the compression is already done. Avoid re-compressing these files.

Is it safe to share files through Google Drive or Dropbox?

Yes, if you use the sharing settings correctly. Set the link to "Anyone with the link can view" only if you want anyone with the link to access it. If the file contains sensitive information, restrict access to specific people and require them to sign in. Delete the file from the service after the recipient downloads it if you do not want it stored there permanently.