TIS-620 to UTF-8 - Thai Text Converter

Convert Thai text from TIS-620 encoding to UTF-8. Essential for legacy Thai government systems, old databases, and text migration. Browser-based, no uploads.

Input (TIS-620)

Drop file here or click to browse

TXT, CSV, DAT from Thai systems

Or paste text directly:

Output (UTF-8)

UTF8MB3 to UTF8MB4 - MySQL Full Unicode …

GBK to UTF-8 - Extended Chinese Text Con…

Universal Text Encoding Converter - 50+ …

EBCDIC to UTF-8 - IBM Mainframe Text Con…

Windows-1250 to UTF-8 - Central European…

View all Encoding translators →

Frequently Asked Questions

TIS-620 (Thai Industrial Standard 620) is an 8-bit character encoding for the Thai language. Published in 1990, it was Thailand's national standard for encoding Thai characters before UTF-8 adoption. TIS-620 covers Thai consonants, vowels, tone marks, and digits but is limited to Thai script only.

Many Thai government databases, legacy systems, and official documents from the 1990s and 2000s use TIS-620 encoding. Government agencies, universities, and public sector organizations archived data in TIS-620 before migrating to Unicode. Converting this data is essential for system modernization and data preservation.

Windows-874 is Microsoft's extension of TIS-620 with additional characters in the undefined ranges (0x80-0x9F). For standard Thai text, they're functionally identical—Windows-874 is backward compatible with TIS-620. This tool treats them as compatible encodings.

UTF-8 is the universal standard for modern systems, supporting all languages in a single encoding. Converting to UTF-8 enables proper display in web browsers, databases, and applications worldwide. It prevents encoding issues when sharing data internationally and ensures long-term data preservation.

The tool uses the TextDecoder API with 'windows-874' encoding (which includes TIS-620). It correctly decodes Thai consonants (ก-ฮ), vowels (◌ะ, ◌า, ◌ิ, ◌ี, etc.), tone marks (◌่, ◌้, ◌๊, ◌๋), and digits (๐-๙). The output is clean UTF-8 text ready for modern systems.

Both! You can drag and drop text files encoded in TIS-620, browse to select files, or paste text directly. The tool automatically decodes the file and converts to UTF-8. Download the converted file or copy the text to clipboard.

The hex view displays the raw byte values of your text, useful for debugging encoding issues. If you see unexpected bytes or need to verify the original encoding, hex view shows exactly what's in the file. This helps diagnose mojibake (garbled text) problems.

Common problems include: (1) Tone marks appearing as separate characters instead of combining properly—this suggests wrong encoding detection; (2) Question marks or boxes—the file may not be TIS-620; (3) Mixed Thai and English garbled—check if the file uses multiple encodings in different sections.

Yes, this tool is ideal for converting legacy Thai government data to modern UTF-8 format. It handles batch text file conversion and preserves Thai diacritics, tone marks, and special characters. Perfect for archival projects, database migrations, and document digitization efforts.

Currently, you can process one file at a time. For batch processing of multiple files, load each file individually, convert it, and download. The tool works entirely offline in your browser, so no data is uploaded to servers—ideal for processing confidential government or business documents.

Related Tools