What are the attachment file size limits?

Last updated: November 5, 2026

Keep attachment files within supported size limits so messages can send successfully.

Attachment size limits

  • JPG: up to 5 MB.

  • PNG: up to 1 MB.

  • PDF: up to 1 MB.

Tips

  • Compress large files before attaching them.

  • Use JPG for photos when possible.

  • Use links for large PDFs or long documents instead of attaching the full file.

  • Test important attachments before sending them at scale.

Troubleshooting

  • If a file does not send, check whether it is over the supported size limit.

  • If an image looks poor after compression, try resizing or cropping instead.

  • If the file format is not supported, convert it to a supported format or send a link.