🔀 Multi-Format Extension (.SUB)

Multiple Formats Use the .SUB Extension

The .sub extension represents 2 distinct file formats depending on your application or industry. Select a format variant below to jump to its specification:

Format 1 Plain text and general documents

MicroDVD Subtitle Track Text File

ZumiFiles Engine: SubtitleViewer frame number subtitle parser

View Plain text and general documents Specs ↓

Format 2 Video and animation

VobSub DVD Subtitle Graphics Container (.idx/.sub)

ZumiFiles Engine: VobSub RLE subtitle graphics extractor & renderer

View Video and animation Specs ↓

⚔️ Format Comparison (.SUB Variants)

Property	Variant 1: MicroDVD Subtitle Track Text File	Variant 2: VobSub DVD Subtitle Graphics Container (.idx/.sub)
Category	Plain text and general documents	Video and animation
File Header / Signature	UTF-8 source text (import / const / type / interface)	Sync byte 0x47 (188-byte transport packets)
ZumiFiles Engine	SubtitleViewer frame number subtitle parser	VobSub RLE subtitle graphics extractor & renderer
Browser Support	✓ PREVIEWABLE (Native)	✓ PREVIEWABLE (High)

.SUB Container • Multi-Format Extension

PREVIEWABLE

SUB File (.sub)

Open and inspect supported .SUB files privately inside your browser. Your files remain 100% local and are never uploaded to any server or cloud API.

Launch .SUB Viewer in ZumiFiles

📋 Detailed Format Specifications

2 Distinct Formats for .SUB

Format 1

MicroDVD Subtitle Track Text File (.sub)

Plain text and general documents • ✓ PREVIEWABLE

ZumiFiles Engine: SubtitleViewer frame number subtitle parser

What is an .SUB File (MicroDVD Subtitle Track Text File)?

MicroDVD Subtitle files (.sub) store frame-accurate text subtitle timing cues for video playback.

Associated Software & Origin

Created for MicroDVD Player, VLC Media Player, MPC-HC, and Subtitle Edit.

Data Structure & Characteristics

Plaintext file formatted as `{start_frame}{end_frame}Subtitle text` (e.g., `{100}{200}Hello world`).

What ZumiFiles Can Inspect

ZumiFiles parses frame rate ratios and renders interactive subtitle timelines with video preview synchronization.

⚡ ZumiFiles Engine Specs for MicroDVD Subtitle Track Text File

✓

Technical Engine: SubtitleViewer frame number subtitle parser

✓

Client-Side Security: 100% in-browser sandboxed decoding with zero network server uploads.

✓

Sidecar Metadata: Attach tags, 5-star ratings, custom color tints, and notes via portable .{filename}.json sidecars.

Format 2

VobSub DVD Subtitle Graphics Container (.idx/.sub) (.sub)

Video and animation • ✓ PREVIEWABLE

ZumiFiles Engine: VobSub RLE subtitle graphics extractor & renderer

What is an .SUB File (VobSub DVD Subtitle Graphics Container (.idx/.sub))?

VobSub Subtitle Stream files (.sub) contain raw DVD subtitle graphics multiplexed into Run-Length Encoded (RLE) bitmapped images, paired with a .IDX index file.

Associated Software & Origin

Ripped from DVD-Video media using SubRip, FairUse Wizard, and HandBrake. Played in VLC and MPC-HC.

Data Structure & Characteristics

Binary container holding 2-bit palette indexed image bitmaps, display timestamps, and bounding box coordinates.

What ZumiFiles Can Inspect

ZumiFiles parses VobSub SPU packet headers and renders transparent subtitle image overlays.

⚡ ZumiFiles Engine Specs for VobSub DVD Subtitle Graphics Container (.idx/.sub)

✓

Technical Engine: VobSub RLE subtitle graphics extractor & renderer

✓

Client-Side Security: 100% in-browser sandboxed decoding with zero network server uploads.

✓

Sidecar Metadata: Attach tags, 5-star ratings, custom color tints, and notes via portable .{filename}.json sidecars.

Related File Formats & Viewers

Inspect other supported formats within the Multi-Format Extension suite:

Flexible Ways to View Files in ZumiFiles

ZumiFiles adapts to your exact workflow. Choose how you want to open and inspect your files:

1. Browse Local Directory

Mount entire project folders directly from your computer using the browser's File System Access API. Navigate nested subfolders with dual-pane split screens.

2. Instant Single-File Preview

Drag and drop or select a single file to inspect it instantly in a sandboxed viewport. Perfect for quick checks without mounting whole directories.

3. Load Remote File URL

Paste any public web URL to fetch and render remote documents, 3D models, code files, or spreadsheets directly inside your browser.

Launch .SUB Viewer in ZumiFiles

Explore all 1,750+ formats in the ZumiFiles File Format Matrix.