SUB to SRT — Format Comparison & Online Converter
Fast, instant SUB (MICRODVD) to SRT (SUBRIP) conversion. No signup required. Just drop your .sub file and get .srt in seconds.
Batch Settings
アニメやドラマの視聴中に、字幕が急に表示されなくなったり、タイミングがずれたりして困った経験はありませんか？あるいは、お気に入りのシーンだけを抜き出して、そのセリフを正確に確認したいと思ったことは？SUB形式の字幕ファイルは、時に特定のプレイヤーで再生できなかったり、編集が難しかったりすることがあります。そこで、より汎用性が高く、多くの動画編集ソフトやメディアプレイヤーで問題なく扱えるSRT形式への変換が非常に役立ちます。このツールは、お手持ちのSUBファイルを瞬時にSRTへ変換し、あなたの視聴体験やコンテンツ制作を円滑にするお手伝いをします。煩わしい互換性の問題を解消し、より自由な字幕活用を始めてみませんか。
- ファンサブ作成時の互換性向上
- ビジネス向けプレゼン動画の多言語対応
- 縦書き字幕への再編集準備
日本のコンテンツ、特に歴史ドラマやアニメでは、縦書き字幕の需要が根強くあります。SRT形式に変換することで、より柔軟に縦書き表示に対応した編集ツールでの加工が可能になります。
About SUB (MICRODVD) to SRT (SUBRIP) Conversion
SUB and SRT (introduced 2000) are both subtitle / caption formats, but they differ in important ways. SUB is a widely used file format. SRT (SubRip) is the simplest subtitle format — plain text with timestamps.
When you convert SUB to SRT, the goal is to convert between formats quickly. Converting SUB to SRT maintains high quality with CocoConvert's optimised encoder settings. Understanding these technical differences helps you choose the right format for your workflow.
Your SUB file is decoded and re-encoded as SRT. The conversion involves 4 steps: (1) your sub file is uploaded and validated, (2) the file is decoded (parsed into its raw data), (3) the data is re-encoded in srt format, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
This conversion is ideal when you When you need a SRT file. For the opposite direction, CocoConvert also supports SRT to SUB conversion.
How to Convert SUB (MICRODVD) to SRT (SUBRIP)
- 1
Upload .sub file
Select your SUB file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .srt
Set SRT as the output format. The converter uses optimal settings based on the SUB→SRT conversion profile.
- 3
Convert
The server-side engine decodes your SUB file and re-encodes it as SRT. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .srt file. Multiple output files can be downloaded together.
What Happens When You Convert SUB (MICRODVD) to SRT (SUBRIP)
Your SUB file is decoded and re-encoded as SRT.
Your SUB file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in SRT format
The converted file is ready for download
Format Comparison
SUB (MicroDVD)
.sub file
| Extension | .sub |
| MIME Type | text/x-sub |
| Category | Subtitle / Caption |
SRT (SubRip)
.srt file
| Extension | .srt |
| MIME Type | application/x-subrip |
| Category | Subtitle / Caption |
Should You Convert SUB (MICRODVD) to SRT (SUBRIP)?
When to Convert
- ✓When you need a SRT file
Frequently Asked Questions
What is the difference between SUB and SRT?
SUB is a widely used file format. SRT (SubRip) is the simplest subtitle format — plain text with timestamps.
Does SUB to SRT conversion affect quality?
Converting SUB to SRT maintains high quality with CocoConvert's optimised encoder settings.
Which format has better compression, SUB or SRT?
SUB is a common subtitle / caption format. SRT uses none compression. The better choice depends on whether you prioritize file size or quality.
How long does SUB to SRT conversion take?
Most conversions finish in seconds. Larger files or complex subtitle / caption content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is SUB or SRT better for long-term storage?
SRT is better for archival since it preserves all original data.