ASS Subtitle
Subtitles & CaptionsASS is text-based subtitle data with timing plus fonts, colors and positioning. Edit with tools such as Aegisub and render with compatible players. Font availability and rendering differences can affect placement/wrapping.
- What it is used for
- Editing styled and positioned subtitles
- What the file contains
- Text
All sections, questions and sources
Content reviewed： · Editor：Kai
Opening steps
Choose your environment or purpose to see its steps.
Menu labels and support vary by app, OS and version. Preserve the original before making changes.
Troubleshooting by symptom
- Placement differs: compare video/script resolution and installed fonts.
- Visible override tags: check ASS support and subtitle mode.
- SRT save refused: review unsupported tags/features and use an export workflow.
- Wrong size/position: inspect reference resolution, styles and overrides.
- Only some lines differ: inspect overrides and font availability.
- Styling lost in SRT: inspect supported feature transfer.
ASS → SRT / rendered subtitles
- For plain cues, export SRT and review style handling.
- To fix appearance in authorized video, render subtitles on a copy with compatible tools and verify placement/timing.
- Check long cues, edge placement and fonts at the destination.
SRT loses much styling/position data; burned-in subtitles cannot be switched off or removed as a separate track.
Styles versus inline overrides
Inline tags can override a line’s assigned font, placement or color.
Source for these steps：Aegisub Project · FAQ / Aegisub Project · Editing styles / Aegisub Project · Attachment Manager / Aegisub Project · Exporting
Preserve editing and viewing versions
Record video edition, reference resolution and fonts and check attachment permissions/container support.
Keep rich ASS source separately from the delivery subtitle/video.
Source for these steps：Aegisub Project · FAQ / Aegisub Project · Editing styles / Aegisub Project · Attachment Manager / Aegisub Project · Exporting
Related-format differences
| Format | Main role | What to check |
|---|---|---|
| ASS | Rich styling/placement | Fonts/overrides |
| SSA | Older related subtitle format | Style differences |
| SRT | Basic text/timing | Potential styling loss |
Handling and security
Check font/video licensing and trusted font sources; avoid unfamiliar plugins merely to display captions.
Questions and answers
Will it look identical on another PC?
Check fonts, renderer support and settings.
Does SRT retain styling?
Much positioning/styling is lost.
Should I burn subtitles into the video?
Retain separate captions/tracks if viewers need to switch them.
Why do only some lines use another font?
Inspect inline overrides and font availability and preview the affected cue.
What should I check with another video resolution?
Compare reference resolution, styles, edges and long lines in the destination video.
Format facts: name, steward and MIME type
- Formal name
- Advanced SubStation Alpha subtitles
- Steward / specification
- Subtitle software ecosystem / Aegisub
- MIME type
- Depends on the producer or server; an extension alone does not establish a MIME type.
Primary and official sources
- Project documentationFAQ
Documents SRT export and subtitle limitations.
Aegisub Project · Link checked： - Official documentationEditing styles
Subtitle font, placement and margin settings.
Aegisub Project · Link checked： - Official documentationAttachment Manager
Subtitle attachments and font dependencies.
Aegisub Project · Link checked： - Project documentationExporting
Reference for subtitle export controls.
Aegisub Project · Link checked：