Email Attachment Guide

How to Compress Photos for Email

Need to email a batch of high-resolution photos but facing size limit rejections? Here is how to shrink them down safely.

Quick Answer

Email providers like Gmail and Outlook restrict attachment sizes to 20MB or 25MB, making it hard to send multiple high-res photos. To compress photos for email, you can use the secure Compress app on your phone. Just import your pictures, choose the universal JPEG or WebP format, and adjust the quality preset (80% quality shrinks files by up to 90% without visible differences). This shrinks several megabytes (MB) down to a few hundred kilobytes (KB), allowing you to attach and send dozens of photos in a single email.

Simple Process

3 Steps to Shrink Photos for Email

Batch-process hundreds of photos locally on your phone.

Select Photos

Open the Compress app. Select the heavy JPEG, PNG, or HEIC camera shots you wish to email from your photo library.

Select JPEG & Quality

Choose output format as JPEG (which is universal) and adjust the quality slider to 80% to achieve the best size savings.

Compress & Attach

Tap "Compress". In just a few seconds, the app converts them. Tap share to attach the smaller JPEGs directly to Gmail or Mail.

App Preview

Visual Guide

Batch-select photos from library

Choose format and quality preset

Get optimized files ready for email

Specifications

Universal Image Formats for Email

Input Format	Optimized Output	Email Compatibility
HEIC (Apple Camera)	JPEG (Optimized JPG)	100% Universal (Works on Windows/Android/Web)
PNG (Screenshots)	JPEG or WebP	Highly compatible, saves up to 95% space
JPEG / JPG	Optimized JPEG	Saves massive space, keeps layout identical

Your Files Stay on Your Device

We respect your confidentiality. The Compress app executes all media conversion and compression offline on your device processor. None of your document pictures, private photos, or video recordings are uploaded to any server.

FAQ

Common Questions

What is the maximum attachment size limit for email services like Gmail?

Most popular email services (such as Gmail, Yahoo, and Outlook) have a maximum attachment size limit of 25MB. If the combined size of your attached photos exceeds this limit, the email will not send.

Does converting HEIC images to JPG help with email attachments?

Yes, converting iPhone HEIC photos to JPG ensures they can open on any recipient's device (including Windows PCs and older email clients). The Compress app handles both format conversion and size reduction in a single process.

Will my photos look blurry after compression?

No. The Compress app uses intelligent down-sampling that keeps the original image dimensions while stripping out redundant data blocks. At our default 80% quality preset, the compressed JPEGs look identical to the naked eye but take up 90% less space.

Ready to compress your media?

Download Compress for free on iOS and Android. Reclaim storage space and speed up sharing with secure on-device optimization.

Download on theApp Store

GET IT ONGoogle Play