How to convert SubViewer to SRT

SubViewer files are older .sub subtitle files that store each cue as a start and end timestamp followed by caption text. They are different from MicroDVD .sub files, which use frame numbers instead of clock time.

SRT is easier to use in editors, upload forms, validators, and review workflows. It stores cue numbers, comma-based timestamps, and readable text blocks.

Quick answer

Use the SubViewer to SRT Converter to convert a time-based .sub subtitle file into standard SubRip subtitles. The tool reads SubViewer timestamp rows, converts [br] markers into line breaks, and runs locally in your browser with no upload.

When to convert SubViewer to SRT

Convert SubViewer to SRT when:

• an older subtitle archive contains .sub files with clock timestamps
• a video editor or upload form rejects SubViewer format
• you need a readable review copy with numbered subtitle cues
• you want to validate timing before publishing or handoff
• a workflow needs SRT instead of a legacy desktop-player format

Keep the original .sub file until the converted SRT has been checked against the video.

What changes during conversion

SubViewer usually stores cues like this:

00:00:01.00,00:00:03.50
Welcome back to the edit

00:00:04.20,00:00:06.00
Today we are converting SubViewer captions[br]They need SRT output

SRT stores numbered cues like this:

1
00:00:01,000 --> 00:00:03,500
Welcome back to the edit

2
00:00:04,200 --> 00:00:06,000
Today we are converting SubViewer captions
They need SRT output

During conversion, the tool:

• reads SubViewer timestamp pairs such as 00:00:01.00,00:00:03.50
• changes dot-based centisecond timing into SRT millisecond timing
• turns [br] markers into normal SRT line breaks
• removes simple inline markup from caption text
• generates sequential SRT cue numbers

Important .sub warning

The .sub extension is ambiguous. A file can be SubViewer, MicroDVD, or another legacy subtitle format.

Use SubViewer to SRT when the rows look like this:

00:00:01.00,00:00:03.50
Caption text

Use MicroDVD to SRT when the rows look like this:

{25}{88}Caption text

If the output timing looks wrong, check whether the source .sub file is actually MicroDVD or another frame-based format.

Step-by-step workflow

1. Save a copy of the original .sub file.
2. Confirm the file uses SubViewer time rows, not MicroDVD frame rows.
3. Open the SubViewer to SRT Converter.
4. Upload or paste the SubViewer subtitle content.
5. Convert the file to SRT.
6. Run the output through the SRT Validator before upload.

Common mistakes

Using the wrong .sub converter

SubViewer and MicroDVD both use .sub. If the source rows use {start}{end} frame numbers, use the MicroDVD to SRT Converter instead.

Expecting styling to survive

SRT keeps timing and readable text. It does not preserve legacy player styling, positioning, or format-specific metadata.

Skipping validation after conversion

Old subtitle files may contain unusual spacing, encoding problems, or malformed rows. Validate the SRT output before uploading it to a platform.

Frequently asked questions

How do I convert a SubViewer SUB file to SRT?

Open the SubViewer to SRT Converter, upload or paste the time-based .sub file, and export the parsed subtitle blocks as numbered SRT cues.

Is SubViewer the same as MicroDVD?

No. Both can use .sub, but SubViewer uses clock timestamps while MicroDVD uses frame numbers. Choose the converter based on the row format, not only the file extension.

Can I convert SubViewer subtitles without uploading the file?

Yes. The converter runs locally in your browser, so the subtitle file does not need to be sent to a server.

Related guides

• How to convert MicroDVD to SRT
• How to validate SRT files
• Common subtitle format errors and fixes
• How to clean subtitle formatting before upload

Related tools

• SubViewer to SRT Converter
• MicroDVD to SRT Converter
• SRT Validator
• Clean SRT File