Everyday Tools

Convert subtitle file

Convert SRT·VTT·SMI subtitles to SRT or VTT. Check Korean encoding and multilingual class, then save as UTF-8 file.

Input

It can be executed directly using the provided example. Load the file below.

Load and encode subtitle file

If the character breaks, select encoding and reload the file. Verify the content and check if it needs replacement. Do not send the file name or original text.

Run with Ctrl or ⌘ + Enter. The original text is not saved. Restarting returns to public examples.

Result

Enter subtitles and run.

      Saves as standard UTF-8 text. Does not preserve style, position, speaker metadata, or VTT annotations. Warns when overlapping sections occur while maintaining original order. Does not include original text or file name in sharing.

      Share result

      Share the tool link and result text together. No URL is included in the result. Check the below content and then share it.

      168 / audio·video

      Adjust subtitle sync.

      Move subtitles forward or backward or correct slowly drifting sync. Check negative timing and overlap, then save as SRT or VTT.

      Start calculating
      119 / Files·Compression

      File hash verification

      Calculate the SHA-256·SHA-512 checksum of the file and compare with the expected value. You can split large files into smaller parts, read them, and cancel processing mid-process.

      Start calculating
      117 / Files·Compression

      Compress ZIP file

      Combine multiple files into a single ZIP file. Choose the compression method and ZIP name, then save a copy with the original content.

      Start calculating

      Calculation method and usage examples

      The first segment of the example is SRT 00:00:01,000–00:00:03,000. Changing VTT results in 00:00:01.000–00:00:03.000, and the subtitles and line breaks are preserved. Paste the original text, select encoding, load the file, and check input/output formats before running. Select a SMI class with multiple languages and run again. The original segment order and timing are preserved, and the SRT number is reset from 1.

      Supported range and limitations

      Read SRT·VTT·SMI and output as SRT·VTT. File size: 2 MiB, text length: 1,000,000 characters, total for all languages: 10,000 units. One unit: 10,000 characters, time range: 99:59:59.999 supported. SMI last paragraph requires a blank SYNC end point of the same language class. ASS·image subtitles·video auto recognition·HLS X-TIMESTAMP-MAP·SMI continuous ID=Source is not supported.

      Auto-encoding only performs BOM or UTF-8 validation and does not guess the language. Supports reference amp·lt·gt·quot·apos·nbsp·lrm·rlm and numeric references. Does not continue conversion for unsupported tags or character references. Ruby pronunciation is replaced with brackets. Check the preview and warning before output and keep the original file.

      Frequently Asked Questions

      What if the Korean characters in SMI subtitles break?

      In file import, select EUC-KR/CP949 and reload. Auto selection performs only UTF-8 validation without BOM. Broken characters are not replaced manually.

      Convert multilingual SMI together at once?

      We separate visual and content for each language class and verify them. Select the class to use and output only one language. After the last marker, a blank SYNC endpoint of the same class is required.

      Are style, location, and original text files preserved?

      Converted to general text, so color·position·speaker metadata and VTT annotations are removed and a warning is shown. The original file is not modified. Downloading yields a separate UTF-8 SRT or VTT file.

      Calculation criteria and reference materials

      Verification of calculation criteria: · Calculation·verification principles · Report errors