Convert SUB to SRT

Convert MicroDVD (.sub) subtitles to SRT online. MicroDVD is a frame-based format where timing is written as frame numbers like {0}{120} instead of timestamps. Because the meaning of those numbers depends on the video frame rate, correct conversion needs the right FPS. This tool reads FPS hints in the file, or defaults to 23.976, and produces accurately timed SRT.

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Supported: ASS, SSA, SMI, SUB (MicroDVD), MPL2, VTT, SRT & ZIP - Max 100MB per file

About Converting SUB to SRT

How MicroDVD SUB Timing Works

In a MicroDVD file, each line starts with two frame numbers in braces, like {7207}{7262}. The first is the start frame, the second is the end frame. To convert those to real time, you divide by the video frame rate: 120 frames at 23.976 FPS equals roughly 5 seconds. This is why getting the FPS right is essential. The tool looks for an FPS hint (for example FPS=23.976) inside the file and uses it automatically, falling back to 23.976 when none is present.

Convert MicroDVD Subtitles for Modern Players

MicroDVD .sub files are common with older rips and some subtitle download sites. Most modern players, TVs and media servers have limited or no MicroDVD support. Converting to SRT removes the guesswork and gives you a file that works everywhere with correct timing.

What If the Timing Is Off?

If the assumed frame rate does not match your video, the converted SRT timings will drift. The tool auto-detects the FPS hint where present. If your video uses a non-standard frame rate, check the FPS in the file or your video specs, and use a subtitle shifter tool afterward to fine-tune the offset if needed.

Frequently Asked Questions

What is the difference between MicroDVD .sub and VobSub .sub?

MicroDVD .sub is a text format using frame numbers. VobSub .sub is a binary image format paired with an .idx file. This tool converts MicroDVD text files. VobSub requires OCR extraction, which is a separate tool.

Why are my converted SUB timings wrong?

MicroDVD uses frame numbers, so conversion depends on the video frame rate. The tool auto-detects FPS hints and defaults to 23.976. If your video uses a different frame rate, the timings will drift; adjust the FPS or use a subtitle shifter.

Does this tool convert VobSub .sub + .idx files?

No. VobSub is a binary image format that requires OCR. Use a dedicated SUB/IDX converter for those. This tool handles text-based MicroDVD .sub files.

Can I convert a batch of SUB files?

Yes. Select multiple .sub files or upload a ZIP archive and the tool converts them all to SRT.

Are my SUB files uploaded anywhere?

No. Everything runs locally in your browser.

Convert Other Subtitle Formats to SRT

Convert Subtitles to SRT (all formats)Convert ASS to SRTConvert SSA to SRTConvert VTT to SRTConvert SMI to SRTConvert ZIP Subtitle Files to SRTConvert Subtitles to VTTConvert Subtitles to PDFMerge SubtitlesChange Subtitle Position

How to use this tool

Convert SUB (MicroDVD) subtitles to SRT when a player or media library needs a simpler, broadly supported text format.

Supported input or output formats for this workflow are .sub input and SRT output. The exact controls on the page determine which options apply.

How MicroDVD SUB Timing Works

In a MicroDVD file, each line starts with two frame numbers in braces, like {7207}{7262}. The first is the start frame, the second is the end frame. To convert those to real time, you divide by the video frame rate: 120 frames at 23.976 FPS equals roughly 5 seconds. This is why getting the FPS right is essential. The tool looks for an FPS hint (for example FPS=23.976) inside the file and uses it automatically, falling back to 23.976 when none is present.

Convert MicroDVD Subtitles for Modern Players

MicroDVD .sub files are common with older rips and some subtitle download sites. Most modern players, TVs and media servers have limited or no MicroDVD support. Converting to SRT removes the guesswork and gives you a file that works everywhere with correct timing.

What If the Timing Is Off?

If the assumed frame rate does not match your video, the converted SRT timings will drift. The tool auto-detects the FPS hint where present. If your video uses a non-standard frame rate, check the FPS in the file or your video specs, and use a subtitle shifter tool afterward to fine-tune the offset if needed.

Format-specific behavior

MicroDVD SUB uses frame numbers, so the assumed or detected FPS controls the resulting timestamps.

Troubleshooting the output

VobSub SUB/IDX is a different image-based format and needs the dedicated OCR route instead of this text converter.

More Questions About This Tool

What is the difference between MicroDVD .sub and VobSub .sub?

MicroDVD .sub is a text format using frame numbers. VobSub .sub is a binary image format paired with an .idx file. This tool converts MicroDVD text files. VobSub requires OCR extraction, which is a separate tool.

Why are my converted SUB timings wrong?

MicroDVD uses frame numbers, so conversion depends on the video frame rate. The tool auto-detects FPS hints and defaults to 23.976. If your video uses a different frame rate, the timings will drift; adjust the FPS or use a subtitle shifter.

Does this tool convert VobSub .sub + .idx files?

No. VobSub is a binary image format that requires OCR. Use a dedicated SUB/IDX converter for those. This tool handles text-based MicroDVD .sub files.

Can I convert a batch of SUB files?

Yes. Select multiple .sub files or upload a ZIP archive and the tool converts them all to SRT.

Are my SUB files uploaded anywhere?

No. Everything runs locally in your browser.

What is the easiest way to convert SUB subtitles to SRT?

Open this tool, select the relevant file, choose the available SUB to SRT converter options, and download the generated result. The page keeps the workflow in the browser rather than requiring an installed editor.

Which files work with this SUB to SRT converter?

Use the formats listed in the tool description and picker. .sub input and SRT output Formats outside that list may be rejected or need conversion first.

Are subtitle files uploaded during processing?

The tool is built for browser-side processing. Your file is selected by the browser and the result is downloaded locally rather than being described as a server upload.

Will the video file be changed?

No. Subtitle tools create or modify subtitle output only. The video itself is not edited, re-encoded, or downloaded by this workflow.

How do I check whether the output worked?

Open the downloaded file with a text editor or your video player. Confirm that cues are present, timestamps make sense, and the filename matches the video when automatic loading is useful.

Next Steps for Your Converted SUB Subtitles

Before archiving the SRT, play it against the first and last ten minutes of your video. If every cue is off by the same amount, or the gap widens over time, send the file through our subtitle sync tool to fix the offset or rescale the timeline — conversion preserves timestamps, so any mismatch was already in the source or comes from a frame-rate assumption.

To understand what the conversion kept and dropped, compare the formats in SRT vs VTT vs ASS subtitle formats, then follow how to add subtitles to a video for loading the SRT in your player of choice. Missing a track for a particular film? Browse movie subtitles to find it, or convert the result to plain text when you need a quotable transcript instead of timed cues.

Convert SUB to SRT in three steps

  1. Select your SUB file: Choose the MicroDVD .sub file, or multiple files or a ZIP for batch conversion.
  2. Convert to SRT: Click Convert to SRT. The tool reads the FPS hint and converts frame numbers to accurate timestamps.
  3. Download the SRT: Save the .srt file and verify the timing matches your video.