Convert frame-based MicroDVD (.sub) subtitle files into universally compatible SubRip (.srt) subtitles for Plex, VLC, Apple TV, Jellyfin, and Smart TVs with zero server uploads.
Detailed side-by-side format architecture for SUB Document (.sub) and SRT Document (.srt). Every conversion executes strictly within isolated browser memory without network transit.
Drag and drop your .sub file onto the working surface or use the system file dialog. File magic bytes are verified locally on device.
Select a quality preset (Lossless, Visually Lossless, Balanced, Smallest) or adjust advanced encoding switches in the options panel.
Click CONVERT to execute local WebAssembly compilation. Save the finished .srt directly to local storage, or stage it for chaining.
Prefer local shell scripting? Run this standard POSIX command on your machine to achieve equivalent transcoding without a web interface:
# Convert SUB to SRT locally
pandoc input.sub -o output.srtWorking with files across multiple web pages? The official convrtr Chrome Extension adds native Side Panel docking, right-click context menu media extraction, and visible viewport capture. Powered by the same zero-upload client-side WebAssembly engine.
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MicroDVD (.sub) is a legacy text-based subtitle format that defines subtitle display times using movie frame numbers (e.g. {100}{150}Hello) rather than hours, minutes, and seconds. It was widely used during the DivX/XviD era.
Modern media players and streaming platforms (such as Plex, Apple TV, iOS, and Smart TVs) require time-based subtitle formats like SubRip (.srt) or WebVTT (.vtt). Because MicroDVD uses frame numbers, players cannot determine when to display subtitles without knowing the exact video framerate.
convrtr automatically parses the initial header cue in the file (such as {1}{1}23.976 or {1}{1}25) to detect the exact authoring framerate. If no explicit header is present, it intelligently defaults to cinematic 23.976 FPS to calculate precise millisecond timestamps.
Yes! convrtr converts MicroDVD pipe separators (|) into proper subtitles newlines and translates {Y:i} and {Y:b} tags into standard HTML <i> and <b> tags supported by all SRT players, while stripping non-standard proprietary tags.
Never. All parsing, framerate calculation, and SRT generation run 100% locally inside your web browser. No data ever leaves your computer.
SUB Document (SUB) and SRT Document (SRT) serve distinct roles across the digital workflow. Converting to SRT provides optimized compatibility, modern compression efficiency, or standardized playback across web browsers, operating systems, and media production environments.
The output format (SRT) is inherently lossless or supports lossless operation. Your original visual or audio fidelity is mathematically preserved without quantization artifacts.
Never. convrtr is architected with a strict zero-upload model. All processing, decoding, decompression, and encoding happen 100% locally on your machine using sandboxed WebAssembly and Web Workers. Your data never touches an external server, database, or analytics collector.
You can execute this conversion locally via command-line utilities such as ffmpeg, cwebp, or ImageMagick. For example: see the developer terminal recipe provided in the technical specifications dossier above. convrtr provides the identical local-first capability directly inside your browser without installing CLI packages.
Yes. You can drop multiple .sub files into the instrument to process them concurrently in browser Web Workers, or click 'Open in Master Studio' to queue mixed formats, configure individual targets, and export as a single ZIP archive.
Convert web media, local files, and document assets directly in Chrome Side Panel using client-side WebAssembly, zero-server uploads, and the official convrtr browser extension.
A byte-level walkthrough of the MLW container format: the Root marker, the filename block, the AES-GCM payload, and the one part of the layout nobody has documented.
MLW uses a single fixed encryption key shared across every install of the app. What that means for whether unwrapping it counts as DRM circumvention — in plain English, not legal advice.