Convert SUB to SRT online and turn MicroDVD and SubViewer subtitles into the format every player reads. Upload files up to 20GB and download the converted result in a few clicks.
Drag & Drop your SUB file here
SUB files, up to 20GB
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Automatically deleted after 24 hours.
Link
20GB upload limit.
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Trusted for 1,827,796+ conversions
HOW IT WORKS
Three steps, no account, nothing to install.
01
Upload your SUB file
Drag and drop a text .sub subtitle file or select it from your device. Picture-based DVD VobSub .sub files can't be converted.
02
Convert to SRT
Keep SRT as the output format and start. The type of .sub is detected, and frame numbers are turned into times using the frame rate stated in the file.
03
Download the SRT
Download a UTF-8 .srt file that plays in VLC, on TVs and in video editors.
SUB
SUB is an extension shared by several subtitle formats. Text .sub files are usually MicroDVD, which times each line by video frame numbers, SubViewer, which uses times, or MPSub, which uses seconds or frames. DVD VobSub .sub files are different: they store pictures of the subtitles, usually alongside an .idx file.
SRT
SRT (SubRip) is the most widely supported subtitle format: a plain-text list of numbered subtitles, each with a start and end time. VLC, smart TVs, video editors and YouTube read it, and it supports only simple tags such as bold, italic and underline.
FILE FORMATS
SOURCE
Text .sub files come in several flavors: MicroDVD, which times lines by frame number like {120}{180}, SubViewer, which uses clock times, and MPSub. They were common with DivX and Xvid films in the 2000s. Frame-based files only line up when the video's frame rate matches. Binary VobSub .sub files are a different, picture-based format.
TARGET
SubRip Text began with the SubRip ripping tool in the early 2000s. Each subtitle is a number, a start and end time with a comma before the milliseconds, and one or more lines of text. Premiere Pro, DaVinci Resolve, VLC, smart TVs, YouTube, Facebook and LinkedIn all accept SRT.
| Feature | SUB | SRT |
|---|---|---|
| Developed by | MicroDVD, SubViewer, MPlayer | SubRip (community) |
| File extension | .sub | .srt |
| Styling | Minimal | Basic bold, italic, underline |
| Positioning | No | No (some players read {\an8}) |
| Best for | DivX-era film subtitles | Editors, TVs, uploads |
| Works in | VLC, older players | Almost every player and site |
USE CASES
Practical workflows where SUB to SRT conversion is useful.
Play old movie subtitles on a TV
TVs and streaming boxes that don't handle MicroDVD read SRT. Convert the .sub that came with an older movie file.
Modernize a subtitle archive
Collections from the early 2000s are full of MicroDVD .sub files. Converting them gives standard SRTs with real timings.
Fix Polish and Cyrillic letters
Polish subtitles in Windows-1250 and Bulgarian or Russian ones in Windows-1251 are detected and written as UTF-8, so letters such as ł and ż and Cyrillic text display correctly.
Add subtitles to an MKV
Muxing tools such as MKVToolNix take SRT. Convert a MicroDVD .sub first, then add it as a subtitle track.
Bring subtitles into a video editor
Premiere Pro and DaVinci Resolve import SRT captions, so convert the .sub to place the subtitles on your timeline.
Keep italic lyrics and voice-overs
MicroDVD italics marked with / or {y:i} become SRT italics, so song lyrics and off-screen voices stay italic.
Check what kind of .sub you have
A DVD VobSub .sub is refused with a message saying it stores pictures and needs OCR, so you know it is not a text subtitle file.
Convert SubViewer files from old editors
SubViewer 1 and 2 files made by older subtitle editors become standard SRT.
Convert MPlayer MPSub files
MPSub files, the subtitle format of MPlayer, are converted whether they are timed in seconds or in frames.
Retime or translate in a modern editor
Subtitle editors and translation tools open SRT. Start from a converted file instead of an old frame-based .sub.
SUPPORTED FILES
Text .sub subtitle files are supported.
{frame}{frame}text files from DivX-era films.
Clock-timed .sub files.
MPlayer's subtitle format.
MicroDVD files with a frame-rate line are timed exactly.
Not supported. Those .sub files hold pictures, not text.
TROUBLESHOOTING
Most issues come from features one format has and the other doesn't.
01
MicroDVD times lines by frame. A file without a stated frame rate is timed at 23.976 fps, so one made for 25 fps video drifts.
02
That's VobSub, a picture format that would need OCR.
03
Most MicroDVD codes are removed; unusual ones may need cleaning in an editor.
04
Subtitle files over 50 MB are refused. Real subtitle files are far smaller.
05
The encoding is detected automatically. A very short file whose only accented letters fit several code pages can be misread; re-save it as UTF-8 and convert again.
06
Video files, picture-based subtitles and other binary files renamed as subtitles are refused with a message saying what they are.
Subtitle Edit and Aegisub are full subtitle editors. dragdropdo is built for converting SUB to SRT quickly, from any device.
| What matters | dragdropdo | Subtitle Edit and Aegisub |
|---|---|---|
| Nothing to install | ✓Yes. Runs in any modern browser. | ~Yes, a desktop download. |
| Works on phones and tablets | ✓Yes. Desktop, Android, iPhone and iPad. | ~No. Windows, Mac and Linux only. |
| Batch conversion | ✓Yes. Add many files and download one ZIP. | ~Subtitle Edit has a batch converter; Aegisub doesn't. |
| Share finished files | ✓Yes. Send a unique link from the result page. | ~You upload and share the files yourself. |
| Pricing | ✓Free with daily limits. $2.99 or $6.99 passes for unlimited use, no monthly plan. | ~Free. |
| Editing timing and text | ✓Not in the converter. Edit the SRT afterwards if needed. | ~Yes. Full timing and text editing. |
Other tools use different pricing, limits and workflows. This comparison describes dragdropdo's own features without assuming every other tool works the same way.
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WHY DRAGDROPDO
Convert SUB to SRT in your browser, with nothing to install and nothing kept after 24 hours.
Private by default
Files are encrypted in transit and deleted from our servers automatically after 24 hours.
No install required
Convert in any modern browser on Windows, Mac, Linux, Android, iPhone or iPad. No app and no sign-up wall.
Big files and batches
Upload files up to 20GB each, add several at once, and download the results one by one or as a ZIP.
Share & download
Save finished files to your device or pass them on with a share link from the result page.
FAQ
Answers to common questions about dragdropdo's SUB to SRT converter.
