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The most powerful subtitle format with full styling, positioning, animation, and visual effects support for professional subtitling.
Convert ASS/SSA subtitle files to simple SRT format
Add professional visual effects to subtitles: colors, shadows, karaoke, fade effects. Export as ASS format with full styling.
Full-featured online subtitle editor with live preview
Preview subtitle appearance and timing before export
Fix character encoding issues in subtitle files
Convert subtitle file encoding between formats
Create professional anime subtitles with typesetting, signs, karaoke, and full styling control using ASS format.
Add synchronized karaoke effects with syllable-highlighting, color changes, and timing using our Subtitle Effects tool.
Position text precisely on screen with pixel-perfect control over font, size, color, and placement.
Create highly readable subtitles with custom styling for viewers with visual impairments.
Design branded subtitle styles for corporate videos, presentations, and marketing content.
ASS (Advanced SubStation Alpha) is the most feature-rich subtitle format available, supporting extensive styling options, absolute positioning, animation effects, and professional-quality typesetting. Originally developed for fan subtitling of anime, ASS has become the standard for high-quality subtitle production. The format supports full font customization including family, size, bold, italic, underline, strikeout, and color. Text can be positioned at exact X/Y coordinates on screen, rotated, scaled, and animated with scrolling, fade, karaoke, and banner effects. ASS files use the .ass extension and contain sections for script info, styles, events, and fonts. Professional subtitlers and typesetters choose ASS when they need pixel-perfect control over caption appearance. Our Subtitle Effects tool can generate ASS files with karaoke, shadows, glows, and other visual effects.
Browse our complete collection of subtitle tools for all your captioning needs.