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.ssa

SSA Subtitle

Subtitles & Captions

SSA stores timed text and styles, related to but distinct from ASS. It does not include the video. Preview with the intended video/fonts and check timing, appearance and placement. SRT export can lose styling/positioning.

What it is used for
Timed subtitles with styles
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.

Open SSA in a compatible editor

Inspect it as an older styled-subtitle format.

  1. Load a copy into Aegisub or another supported editor.
  2. Load the matching video edition.
  3. Preview fonts, placement and timing.
Save an ASS copy and compare

Retain original SSA after migration.

  1. Inspect imported styles and cue count.
  2. Save separately in supported ASS format.
  3. Compare styling/placement on representative and long lines.
Export simpler captions

Complex presentation may not survive.

  1. Inspect required text and timing.
  2. Export separately to SRT or another required format.
  3. Validate text, breaks and sync in the target player.

Menu labels and support vary by app, OS and version. Preserve the original before making changes.

Troubleshooting by symptom

  • Garbled text: identify the source encoding before saving a copy.
  • Different font/position: check fonts and SSA-style support.
  • Timing mismatch: compare video edition, starting time and duration.
  • Placement differs: compare style handling and fonts.
  • ASS rendering changed: compare resolution, styles and overrides.
  • Missing glyphs: inspect font coverage and encoding.

SSA → ASS / SRT

  1. Preview in a compatible subtitle app against the intended video.
  2. Export separately and compare line breaks, all cues, timing and styling.
  3. Compare styles, cue count and synchronization with the original SSA.

SRT does not fully retain SSA styling; renaming does not resolve format differences.

Retain the original legacy data

Keep SSA so that changes introduced by import/migration can be compared.

Source for these steps：Aegisub Project · FAQ / Aegisub Project · Editing styles / Aegisub Project · Exporting

Compare styling and synchronization separately

Inspect short, long and overlapping cues for presentation changes.

Check timing against the video edition and label source, editing and delivery versions.

Source for these steps：Aegisub Project · FAQ / Aegisub Project · Editing styles / Aegisub Project · Exporting

Related-format differences

Related-format differences
FormatMain roleWhat to check
SSALegacy styled subtitlesCompatibility/rendering
ASSRelated richer formatStyle migration
SRTText/timingReduced presentation

Handling and security

Check provenance/licenses for fonts/video and review caption content before sharing.

Questions and answers

Does SSA include video?

No; the media is separate.

Can I just rename to ASS?

Use a compatible reader/writer and verify differences.

Does SRT retain all styling?

Fonts/placement and other styles may be lost.

Are SSA and ASS completely identical?

They are related but differ in features; inspect the converted rendering.

Can I rename SSA to SRT?

Export text/timing because the structures differ.

Format facts: name, steward and MIME type
Formal name
SubStation Alpha subtitles
Steward / specification
SubStation Alpha / subtitle software ecosystem
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：
  • Project documentationExporting

    Reference for subtitle export controls.

    Aegisub Project · Link checked：