Regional Thailand Font Converter — 100% Secure & Private.
Thai (TIS-620) is a legacy encoding used for Thailand regional script typing. Because it maps characters to standard keyboard keys rather than Unicode positions, this tool is required to convert Thai (TIS-620) text into modern Unicode for web display and digital publishing.
Our Thai (TIS-620) font converter runs entirely in your browser. None of the text you type or convert is sent to any server. This makes it perfect for private document processing and ensures zero data leaks.
Paste your Thai (TIS-620) text into the source input area.
The tool will instantly convert it to standard Unicode below.
Click 'Copy Result' to use the Unicode text anywhere online.
Use the Vicerversa (Swap) button to convert from Unicode back to Thai (TIS-620).
Encoding Engine
Our high-performance engine uses a two-pass mapping system to resolve character swaps and script-specific vowel reordering rules, ensuring that your text remains linguistically accurate after conversion.
Unicode is the industry standard for consistent encoding, representation, and handling of text across most of the world's writing systems. Legacy fonts like Thai (TIS-620) were designed before Unicode adoption.
Instantly convert legacy TIS-620 and Windows-874 Thai encoding into standard UTF-8 Unicode. Fix broken Thai text for digital publishing, mobile apps, and global SEO.
Before the internet unified under the UTF-8 Unicode standard, Thailand relied on a national standard called TIS-620 (and Microsoft's nearly identical Windows-874) to encode the Thai language on computers. This legacy 8-bit encoding system was highly efficient for the 1990s, but it is fundamentally incompatible with the modern, multilingual web. If a modern web browser attempts to read a legacy TIS-620 text file without being explicitly told the encoding, the Thai characters will render as unreadable, chaotic gibberish. The TIS-620 to Unicode Converter mathematically translates this legacy encoding into pristine, universally recognized Thai Unicode.
TIS-620 (Thai Industrial Standard 620-2533) is an 8-bit character set that maps the Thai alphabet to the upper 128 bytes of a standard computer file, leaving the lower 128 bytes for standard English ASCII.
Microsoft adopted this standard for Windows 95, calling it Windows-874. While highly successful locally, it caused massive issues globally. Modern systems use UTF-8, which uses multiple bytes to represent complex foreign characters. If you paste TIS-620 bytes into a UTF-8 system, the system misinterprets the bytes, resulting in corrupted text. This tool acts as the necessary translation layer between the two eras of computing.
The Thai script features complex typography where tonal marks and vowel symbols must stack vertically above or below the primary consonant.
Legacy encodings often handled these stacks poorly, leading to "floating" tone marks or broken layouts when forced onto early mobile phones. When converting from TIS-620 to Unicode, our engine ensures that the strict logical sequencing demanded by the Unicode Consortium is maintained, guaranteeing that the stacked characters will render flawlessly on iOS and Android devices.
If you have an old text file, a database export, or a snippet of code that looks like corrupted Thai text, paste the raw data into the converter's input box.
The system will instantly parse the 8-bit encoding and output flawless Thai Unicode (`ภาษาไทย`). You can safely copy this text and paste it directly into WordPress, Facebook, or any modern CMS. If you are dealing with Cambodian text from the same era, try our Khmer Limon Converter.
Many legacy Thai corporate systems (including older banking mainframes and government databases) still run natively on TIS-620.
When these corporations attempt to build modern APIs or mobile apps, the database output shatters. This browser-based tool is essential for developers debugging those API responses. It allows them to instantly decode a payload, verify the TIS-620 mapping, and architect the automated backend translation pipelines required for modern deployment.
Quick answers to common questions about this utility.
Yes, the tool supports bidirectional conversion. If you are building a modern web application that needs to push data back into a legacy Thai government mainframe that only accepts TIS-620 encoding, you can use the reverse toggle.
This tool converts raw character encoding, not document formatting. If you copy text from an old Word document, styling like bold, italics, and colors are stripped away. You will need to reapply your styling once you paste the converted Unicode text back into your editor.
Almost. Windows-874 is based on TIS-620 but adds a few extra characters in the previously unassigned slots (like the Euro symbol). For 99% of standard Thai text conversion, the two standards can be treated interchangeably.
