SBV to ASS Converter
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Supports .sbv files up to any size
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Free Online SBV to ASS Converter
Our SBV to ASS converter upgrades SubViewer subtitle files into Advanced SubStation Alpha format, opening up a world of visual styling that SBV was never designed for. ASS files contain structured sections ([Script Info], [V4+ Styles], [Events]) that let you define fonts, colors, outlines, shadows, screen positioning, and per-cue override tags. The converter maps each SBV text entry into an ASS Dialogue line, rewrites the timestamps from SBV millisecond notation to ASS centisecond notation (H:MM:SS.cc), and generates the required section headers. The result opens directly in Aegisub or any ASS-compatible editor for further styling.
Input Format
SBVSubViewer (SBV) is a lightweight subtitle format popularized by subtitle repositories like SubDl and OpenSubtitles. Each entry places both timestamps on a single line using the pattern 0:00:01.234,0:00:04.567 (start and end separated by a comma, hours not zero-padded, milliseconds preceded by a period). There are no sequence numbers and no file header. The subtitle text follows immediately below. SBV sometimes uses bracket-style tags such as [br] for line breaks and [i] for italics, but the format has no standardized styling system.
Output Format
ASSASS (Advanced SubStation Alpha v4+) is a powerful subtitle format that supports custom fonts, colors, sizes, outlines, shadows, screen positioning, rotation, and karaoke effects. An ASS file contains three main sections: [Script Info] with metadata like title and resolution, [V4+ Styles] defining named style presets (Default, Title, etc.), and [Events] holding Dialogue lines. Each Dialogue line includes fields for Layer, Start, End, Style, Name, margin overrides, and the text itself, which can contain override tags like {\b1} for bold or {\pos(320,400)} for positioning.
Features
Why Convert?
Format Differences
Common Use Cases
Anime and Fansub Styling
Convert plain SBV text into ASS format so you can add the styled fonts, colors, and positioning that fansubbing requires using Aegisub.
Karaoke Subtitles
Prepare SBV subtitle content for karaoke effect creation in ASS, which supports syllable-level timing via override tags.
MKV Soft Subtitles
Mux styled subtitles into Matroska containers, which support ASS as a native subtitle track with full styling preserved.
Professional Caption Styling
Add corporate brand fonts and colors to subtitles by converting SBV to ASS and defining custom style presets.
Screen Positioning
Place subtitles at specific screen coordinates (top, bottom, sides) using ASS positioning override tags that SBV cannot represent.
Multi-Layer Subtitles
Use ASS layering to display multiple subtitle lines simultaneously, such as a title card plus dialogue, which SBV does not support.
Related Formats
SBV (SubViewer)
The input format: plain text with comma-separated timestamps, no styling capabilities.
SSA (SubStation Alpha)
The predecessor format: similar structure to ASS but with fewer features. Most ASS files are backward-compatible with SSA readers.
SRT (SubRip)
The plain-text alternative: if you do not need styling, convert SBV to SRT instead for maximum player compatibility.
Frequently Asked Questions
ASS supports custom fonts, font sizes, primary and secondary colors, outline width, shadow depth, bold/italic/strikeout, screen positioning via pixel coordinates, alignment in 9 positions, rotation, scaling, fade effects, and karaoke timing. SBV has none of these.
Yes. The converter creates a Default style preset that you can modify in Aegisub. You can change fonts, colors, sizes, add new named styles, and apply them to individual Dialogue lines.
Yes. The converter creates a standard [V4+ Styles] section with a Default style that uses sensible defaults (Arial, 20pt, white text, black outline). You can customize this in Aegisub or any text editor.
SBV uses H:MM:SS.MMM (millisecond precision). ASS uses H:MM:SS.cc where cc is centiseconds (two digits, 00-99). The converter rounds milliseconds to the nearest centisecond: 234ms becomes 23cc, 567ms becomes 57cc.
Override tags are inline commands enclosed in curly braces within Dialogue text. For example, {\b1} makes text bold, {\i1} makes it italic, {\pos(320,400)} positions it at pixel coordinates, and {\fad(500,500)} adds a fade effect.
Yes, completely free with no registration or watermarks. All processing happens in your browser.