Subtitle Edit

the subtitle editor :)

---

ASSA Attachments

Manage fonts and images embedded as attachments in an Advanced SubStation Alpha (ASS/SSA) subtitle file.

Menu: ASSA tools → Attachments...

How to Use

1. Open a subtitle file in ASS/SSA format.
2. Go to ASSA tools → Attachments… to open the attachments manager.
3. View the list of currently embedded fonts and images.
4. Use Attach… to attach new font or image files, or Import… to take the attachments from another .ass file.
5. Right-click an attachment and use Delete or Clear to remove attachments.
6. Select an image attachment to see a preview.
7. Click OK to save changes.

Features

Font Attachments

• Embed TrueType (.ttf) font files directly in the subtitle file (the file picker offers *.ttf).
• Ensures the correct fonts are available regardless of the system fonts installed.

Image Attachments

• Embed image files (PNG, JPG, GIF, BMP, ICO) in the subtitle file.
• Preview embedded images directly in the dialog.

Management

• Add one or more attachments at a time.
• Delete individual attachments or clear all attachments.
• View attachment names and sizes.
• Export… saves the selected attachment to a file.
• With a font selected, Copy to clipboard copies its font name and Copy to font collector copies the font file to Subtitle Edit’s Fonts folder.
• Reorder via the right-click menu: Move up (Ctrl+Up), Move down (Ctrl+Down), Move to top, Move to bottom.

Trim Fonts to Used Characters

• Trim fonts to used characters… rewrites each embedded TrueType font so that only the glyphs used by the subtitle’s text keep their outlines - a full CJK font of many megabytes typically shrinks to a few hundred kilobytes.
• Character coverage, kerning, ligatures and complex-script shaping (Arabic, Indic, …) are preserved for the text the subtitle actually contains, and the font’s family name is unchanged.
• Trim as a final step: text added to the subtitle later may display with missing characters, since its glyphs were removed. Re-embed the full font if the text changes.
• Only TrueType fonts with glyf outlines can be trimmed; CFF-based OpenType fonts and font collections (.ttc) are kept unchanged.
• The same trimming is available as a checkbox in the font collector’s Embed fonts in subtitle and in batch convert’s Embed fonts function.

Keyboard Shortcuts

Shortcut	Action
F1	Show help (default key, changeable)
Escape	Close dialog