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By default, the Maestra Editor uses web-safe fonts — universally supported across browsers, devices, and email clients. If your email design uses custom or branded fonts, you can upload them in the Maestra Editor.
Note: Custom fonts are not supported by all email clients.

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Supported formats

The Maestra Editor supports the following font formats:
  • .woff
  • .woff2
If your file is in another format (such as .ttf or .otf), convert it using an online tool such as CloudConvert.

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How to upload a custom font

  1. Open the Maestra Editor.
  2. Select any text block.
In the font dropdown list, click Add custom. ​
  1. In the upload window, specify:
  • a unique font name
  • the font file in .woff or .woff2 format
  • font weight
  • font style
  1. Click the Add button.
After uploading, the custom font appears in the font list and is available for all blocks in the Maestra Editor.

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Font weights and styles

For each uploaded font file, you can assign one weight:
  • Regular
  • Bold
and one style:
  • Normal
  • Italic

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Non‑standard font weights

If your font uses other weights or styles (such as Light, Medium, Semibold, etc.), each weight must be uploaded as a separate font file with a unique name. How to upload a font with a non‑standard weight:
  1. Name the font using the format [Font Name] + [Weight] (for example, Ubuntu Light).
  2. Upload the font file.
  3. Set:
  • Weight – Regular
  • Style – Normal
This ensures the font displays with the correct visual weight when selected in the Maestra Editor without additional settings.

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Custom Font Support Across Email Clients

Not all email clients support custom fonts — when they don’t, your email should fall back to a web-safe font instead.
Supported email clients:
  • Apple Mail (iOS, macOS)
  • Outlook for macOS
  • Thunderbird
  • Android Mail (excluding Gmail)
Most other email clients do not support custom fonts, including:
  • Gmail (except Roboto / Google Sans)
  • Outlook.com / Outlook for Windows
  • Yahoo! Mail

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Fallback fonts

To ensure your email displays correctly in email clients that don’t support custom fonts, specify a fallback font that closely matches your custom font. How fallback fonts work:
  • In supported email clients, the custom font is used.
  • In other clients, the fallback font is used.
  • Layout and readability are preserved.
Recommendations:
  • Always specify a fallback font.
  • Test a preview email in popular email clients before sending your campaign.