The Mailpro Builder accepts a wide range of file types for images, attachments and downloadable resources. Each type has a maximum size designed to balance email deliverability with rich content. The reference table below covers everything you can upload from the editor or the file manager.
Supported image formats
| Format | Max size | Best use |
|---|---|---|
| JPG / JPEG | 5 MB | Photos, hero banners |
| PNG | 5 MB | Logos, screenshots, transparent images |
| GIF (animated or static) | 5 MB | Light animations, icons |
| WebP | 5 MB | Modern responsive images (limited Outlook support) |
| SVG | 1 MB | Vector logos and icons |
Document and downloadable file formats
| Format | Max size | Typical use |
|---|---|---|
| 10 MB | Catalogs, brochures, tickets | |
| DOC / DOCX | 10 MB | Editable documents |
| XLS / XLSX | 10 MB | Spreadsheets, price lists |
| CSV | 10 MB | Data files, contact imports |
| ZIP | 10 MB | Bundled files, multi-document downloads |
| ODS | 10 MB | Import lists |
| VCF | 10 MB | Import lists |
Audio and video
Direct upload of audio/video into emails is not recommended — most clients block them. Instead, host on YouTube/Vimeo and link from a thumbnail. The Mailpro Builder has dedicated YouTube and Vimeo blocks that auto-generate clickable thumbnails.
Where the files are stored
Every uploaded file is hosted on Mailpro’s CDN with HTTPS and a stable URL. Files remain available as long as the account is active. Read more about image and file hosting.
Best practices
Compress images before upload (TinyPNG, Squoosh, ImageOptim) to keep emails snappy. Use SVG for crisp scalable logos. For attachments larger than 10 MB, link to a cloud share (Google Drive, Dropbox) instead of attaching.
Build emails that load fast
Mailpro’s drag-and-drop editor includes an integrated image editor to crop, resize and optimize your assets in one place. Read the full file size FAQ.