Compress Images for Email: Stay Under 25 MB (2026)

You try to attach a photo to an email and get an error: "Your message exceeds the maximum attachment size." The photo is one image from your phone camera. It should not be a problem, and yet here we are.

Modern phone cameras produce photos between 3 and 12 MB each. Add three of them and you are over the Gmail 25 MB limit. Add five and even Outlook's 20 MB limit is gone. The fix is to compress the images before attaching, and it is a 30-second job once you know what to do.

Email attachment limits (2026)

Many email providers increase the effective limit by automatically uploading large files to cloud storage and inserting a link. But this has three problems: the recipient may need a specific account to download, the link expires after a period, and it adds a step for the recipient. For most situations, compressing the images and attaching them directly is simpler and more reliable.

What size should you aim for?

Two goals matter: staying under the email limit, and being kind to the recipient's inbox.

• Total attachment under 5 MB: comfortable for any email provider and any inbox.
• Each image under 500 KB: after compression, still looks great on any screen.
• Each image under 200 KB: if sending more than 10 images.
• Do not go below 100 KB per image unless the images are tiny thumbnails. Quality suffers visibly.

For a typical email with 3 to 5 photos, aim for 500 KB per image. That gives you 1.5 to 2.5 MB total, well under every provider's limit and pleasant for the recipient.

How to compress images for email

1. Open the Image Compressor tool.
2. Drop in all the images you want to send. JPG, PNG, WebP, HEIC: all work.
3. Choose your target. 500 KB per image is a good default. Or set a total target size for all images combined.
4. Let the tool run. Compression takes a few seconds per image.
5. Download the compressed files.
6. Attach them to your email as usual.

Everything runs in your browser. Nothing is uploaded. The images never leave your device.

Compression vs resizing: which do you need?

Two different operations, often confused:

A modern phone photo is roughly 4000 x 3000 pixels. That resolution is designed for printing, not for email. If the recipient will view the image on a screen (phone, tablet, laptop) resizing to 1600 x 1200 reduces the pixel count by 84 percent with no visible quality loss. Then compress at quality 85, and the resulting file is 150 to 300 KB instead of 4 MB.

The workflow that produces the best result:

1. Resize the image to 1600 pixels on the longest side.
2. Compress at 80 to 85 percent quality.
3. Check the result at 100 percent zoom before sending.

Tips for compressing without wrecking the image

• Start from the highest-quality original you have. Do not compress an already-compressed image.
• For photos of people, aim for 80 percent quality. For photos of text or documents, aim higher. Text needs more bits to stay readable.
• Never compress below 70 percent quality. The difference is visible even to non-experts.
• If you are compressing screenshots, use PNG, not JPG. PNG keeps text edges sharp.
• For images with transparency (logos, graphics) keep them as PNG even after compression.
• If the image has fine detail (thin lines, small text) test the compressed version on your phone before sending.

Alternatives if compression does not get you there

If you have already compressed and still exceed the limit, the alternatives are:

1. Split the images into multiple emails. Three images per email, split across two or three emails. Simple, works everywhere, no link expiry.
2. Use a cloud storage link. Google Drive, Dropbox, OneDrive. Upload once, share a link. The recipient may need an account, and the link expires, but it works for very large attachments.
3. Use a file transfer service. WeTransfer, Send Anywhere, Filemail. No account needed on either side. Link expires in 7 days. Good for very large batches.
4. Zip the images. A ZIP file reduces overall size by 5 to 15 percent for images (they are already compressed, so ZIP does not help much). Useful for organisation, not for size.
5. Reconsider whether the email is the right medium. If you are sending 50 high-resolution photos, email is not the tool. Use a shared album (Google Photos, iCloud) instead.

Common mistakes

• Compressing at maximum even when the recipient has a fast connection. Aim for a reasonable quality target, not the smallest possible file.
• Compressing a screenshot as JPG. Text edges become fuzzy. Use PNG for anything with text.
• Overcompressing and then trying to save the small file larger. Compression is one-way. You cannot recover what was lost. Keep the original.
• Compressing after the file has already been through WhatsApp, Instagram or another lossy pipeline. The double compression is visible. Compress from the original source.
• Sending a ZIP file and expecting the recipient to figure out how to open it. Some people do not know how to extract ZIPs. Compress the images directly instead.

The bottom line

Compressing images for email is a 30-second job. Resize phone photos down to 1600 pixels on the long edge, compress at 80 to 85 percent quality, and a 4 MB photo becomes a 250 KB file that looks identical on any screen.

For batches of images, aim for 500 KB per image. For a single hero image, 1 MB is fine. Do not over-compress. The goal is a smaller file, not an unusable one.