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Top 2 Free Subtitle Converter to Convert Sub to SRT

by Kayla Morrison • 2020-10-28 19:00:09 • Proven solutions

Ripping DVDs results in subtitles extracted in Sub/Idx format that comes in a pair having the text picture along with information for displaying the text. These .SUB files are compatible with playing on the latest players and programs, including GOM, VLC, and many others. On the flip side, there are compatibility issues while playing these subtitles on your mobile phones, handheld devices, TV, and others. The basic text format subtitles in SRT format works best here.

Though SRT subtitles for videos can be downloaded from a number of online sites, they might result in syncing and other issues. Thus the best solution here is to convert the SUB subtitles (Sub +IDX) to SRT format using programs and tools designed for the task. Listed below are some of the commonly used subtitle format converter to convert SUB subtitles to SRT.

Part 1. How to Convert Sub to SRT with SRT Converter

A good conversion program can be used for getting SRT subtitles from your SUB files. Since SUB files are image files, conversion requires proper steps to be followed. Below given is a guide to convert subfile to srt using the Subtitle Edit tool from

Step 1. From, download and install the latest version of the Subtitle Edit tool. A portable version of the program is recommended, and it comes as a ZIP file that you can extract as a folder, or you can also save it as an installer.

Step 2. Launch the program and from the primary interface hit on the Open button to load the SUB subtitle that needs to be converted. Here, ensure that.IDX file is also present in the same directory. The name of the IDX and SUB file should also be the same.

Step 3. Next, when the subtitle file is added, the OCR module will be loaded to the program for converting the image files to the text format. Configure all the related settings present on the page and then click on the Start OCR button.

Step 4. The program will initiate the OCR process, and if any review is needed, it will be highlighted by the program upon the completion of the process.

Step 5. Once the process is complete, review the subtitle and then finally save then as SRT format. The program uses the codes from the DVD subtitle, and thus the new fine is in sync and can be played without any issues.

Part 2. How to Convert Sub to SRT with Online Subtitle Converter

Online conversion tools are available to facilitate the simple and quick conversion of SUB to SRT format. Using these programs, no software download or installation is needed, and the majority of the online tools are free to use. Listed below are the top 2 tools in the category.

1. Toolslick

This is free to use browser-based program SRT Converter that facilitates converting subtitles from the MicroDVD or SubViewer SUB format to SRT format. You can upload the subtitle file for conversion to the program and option to download the SRT subtitles as .srt files are also there. The program allows shifting time of the subtitles forward or backward through its Time Shift By option. Option for fixing the synchronization issues after a period is also there.

convert sub to srt online

Guide to Convert Sub to SRT Online Using Toolclick

Step 1. Launch on your system browser. Click on the UPLOAD button to browse and load the SUB subtitle.

Step 2. Under the Setting section, you can shift the subtitle settings by mentioning the duration at Time Shift By section. To move the time backward, use a negative value. If needed, synchronization issues can be fixed by mentioning value at Time Shift After.

Step 3. After settings are done, click on the CONVERT button to convert SUB to SRT online.

The converted subtitles will be made available on the interface of the program.

2. Subtitlefix

This online subtitle converter works from the browser window and, in addition to subtitle conversion, supports an array of other functions like dividing and merging the subtitles, expanding them, and others. You can convert SUB subtitles to SRT and SRT to SUB using the program. Option for removing the HTML tags is also there.

free convert sub to srt

Guide to Use SRT Converter Online

Step 1. On your system browser, run Click on the Choose file button to browse and load the SUB subtitle present on your system.

Step 2. Choose the rate/fps from the given drop-down options. If needed, enable the checkbox for removing the HTML tag.

Step 3. Click on the SEND button, and the program will convert the added SUB to SRT format, which will be automatically downloaded to your system.

Part 3. How to Add Subtitle to Video (External Reading)

Several times, you have videos without any subtitles, or the subtitles are present separately. In these and other similar situations, you need to add the subtitles separately using a tool. One such excellent program that facilitates in the task is Wondershare UniConverter. This professional desktop program allows adding subtitles to your video from the local system. So your converted SRT subtitles can be added to your MP4, M4V, and other videos simply and quickly using Wondershare UniConverter. The font color, font size, font style, position, transparency, and position of the subtitle can also be selected using this tool. The software works on all latest versions of Windows and Mac system.

best subtitle tool Wondershare UniConverter - Best Subtitle Tool MOV Mac/Windows (Catalina Included)

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  • Add subtitles from local PC or Internet online
  • Extract subtitles from MP4, MKV, DVD and any video file in .srt, .ssa and .ass
  • Edit subtitles by adjusting font, font color, font size, transparency, position and more
  • Support multiple audio track and subtitles and freely switch on/off subtitles
  • Convert video to MP4, MOV, MKV, AVI and over 1000 video/audio formats with subtitles
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  • Supported OS: Windows 10/8/7/XP/Vista, Mac OS 10.15 (Catalina), 10.14, 10.13, 10.12, 10.11, 10.10, 10.9, 10.8, 10.7, 10.6
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How to Add Subtitles to Video Using Wondershare UniConverter

Step 1 Add video and get the editing window

Launch the Wondershare UniConverter software on your Windows, and load the video by clicking on the Document icon from the Video Converter tab. The added file will appear with a thumbnail image. Under the image, 3 editing icons are present. Click on the middle Crop icon or the last Effect icon to open the editing window.

open add subtitle window

Step 2 Choose the Subtitle option and import the subtitle present on your system

From the editing window, choose the Subtitle tab. Next, click on the button browse and import the subtitle (converted) present on your system. The searching button allows adding the subtitles online directly.

add subtitle to video

Step 3 Choose the font and other subtitle options

Once the subtitle is imported, you can choose the Font Style, Size, Color, Outline Width, Outline Color, Transparency and Position of the subtitle. Click on the OK button to confirm and save all the changes made.

edit video subtitle

Step 4 Convert and add subtitles to the video

At the Setting icon, choose the desired target format from the Video tab. At the Target window, you can see the added subtitle option coming. Finally, click on the Start All button to start processing the files. The converted video with added subtitles can be checked on the program interface from the Finished tab. On the computer, the files can be located at the destination selected at the File Location tab.

convert video with subtitle


With Wondershare UniConverter, you can burn Burn ISO to DVD as well. Move to How to Burn ISO Video to DVD with High Quality >> to learn more.

The above-listed steps are for the Windows version. The Mac version steps are a little different, which you need to check while processing the files.

So using a good SUB converter, you can convert your subtitles to SRT format. A number of SUB to SRT converter online tools is present as well. Once you convert subtitles to SRT, they can be added to your desired videos in different formats using professional software Wondershare UniConverter.

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Kayla Morrison

Kayla Morrison

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