Compress images for email.

Never exceed an email attachment limit again.

Email attachment limits exist for a reason — large files clog inboxes, slow down delivery, and bounce back when they exceed the provider's cap. Gmail, Outlook, Yahoo, and Proton Mail all limit total attachment size to 25 MB. A single photo from a modern smartphone (8-12 MB) takes up half that budget. Three photos and you hit the limit.

Our compressor solves this with target-size mode. Set the target to 500 KB per image — a size that looks great on any screen — and the encoder automatically finds the optimal quality and resolution to hit it. A batch of 10 photos that would have been 100 MB raw becomes 5 MB, well within any email provider's limit. The compressor runs entirely in your browser, so your sensitive documents and personal photos never leave your device.

Best practices for email images

For photographs embedded in an email body, resize to 600-800px wide and use JPEG quality 80. For email attachments that will be downloaded and viewed full-size, quality 85-90 preserves more detail while still keeping files under 1 MB. PNG screenshots of documents or presentations should use lossless mode to preserve text sharpness. Always preview your compressed image with the comparison slider before attaching — what looks good in the compressor may reveal artefacts when viewed at full resolution.

Different email providers handle images differently. Gmail strips EXIF metadata automatically. Outlook renders images at 72 DPI regardless of source. By pre-compressing with our tool, you control exactly what the recipient sees. For format-specific compression, see our dedicated JPEG compressor, PNG compressor, and WebP compressor.

Supported formats for email

Our compressor accepts JPEG, PNG, WebP, AVIF, GIF, SVG, HEIC, and TIFF as input. For email, JPEG is best for photos and PNG for screenshots. All processing happens locally in your browser.