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Gmail Attachment Image Size: Complete 2026 Requirements

Gmail has a 25 MB total attachment limit, and large images are the usual cause of bounced mail — resize photos to roughly 1280 px wide and compress each image to about 100 KB to 1 MB so messages send quickly on every client.

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Last updated · US-focused · reviewed by the FreeConverterTools editorial team.

Gmail Attachment Image Size requirements
Gmail attachment limit25 MB total
Practical image targetUnder 1 MB each (100 KB is safer)
Good email widthabout 1280 px
Bulk optionUp to 30 images per batch

Open the free Compress Image to 100KB

The short answer

Gmail has a 25 MB total attachment limit, and large images are the usual cause of bounced mail — resize photos to roughly 1280 px wide and compress each image to about 100 KB to 1 MB so messages send quickly on every client. Gmail blocks attachments over 25 MB. Resize to about 1280 px wide and compress images under 100 KB–1 MB so emails send fast. Free, no upload, bulk 30.

Gmail Attachment Image Size — full specification

Every value below is a hard requirement you can hit in your browser. The whole page and its tools run locally, so your image never leaves your device.

How to get a compliant gmail attachment image size for free

1
Downscale to about 1280 px

Use the resize tool so the image is not oversized.

2
Compress under 100 KB

Set an exact KB target for fast sending.

3
Bulk 30 at a time

Compress a whole batch and download one ZIP.

Why choose a no-upload gmail attachment image size tool?

Because the fastest, most private way to meet Gmail Attachment Image Size specs is to process the image on your own machine. FreeConverterTools.net uses your browser's built-in decoders (Canvas, WebCodecs, WASM) — no upload endpoint, no queue, no account, no watermark and no credit meter. That is exactly what a privacy-first tool should be, and it is why these guides and their tools can stay free.

Frequently asked questions

Why won’t Gmail send my image?
A single photo over the 25 MB total attachment limit (or pushing the thread over it) is rejected. Resize and compress it.
What image size is safe for email?
Around 1280 px wide and under 1 MB — ideally about 100 KB — displays cleanly and sends fast.

Related free tools

Compress Image to 100KBfree · no uploadCompress Image to 1MBfree · no uploadReduce Image Size in Pixelsfree · no uploadBulk Image Compressorfree · no upload

Browse the full image size requirements guide, the directory of all 220 tools, or the image format guide.