Translate Video to Thai in 2026 — Frame-Aligned Subtitles at Scale

Speech recognition (ASR) — Thai phoneme detection

The audio track is transcribed to text with token-level timestamps. Thai ASR requires specialized phoneme detection models to handle Thai's tonal phonology and the acoustic distinctions between consonant clusters — accuracy at this stage directly impacts subtitle timing and translation quality.

Neural machine translation — context-aware Thai syntax

Thai sentence structure is SOV-flexible and topic-prominent — the subject is often omitted when context is clear, and topic fronting is common. AdTransPro's NMT model preserves these constructions, producing natural Thai output rather than word-for-word English-order translations that would read awkwardly to Thai audiences.

Thai word segmentation — no spaces in Thai script

Thai script has no spaces between words — a continuous string like คุณต้องการอะไร must be segmented into คุณ / ต้องการ / อะไร before subtitle line breaks can be applied. AdTransPro runs a dedicated segmentation model trained on Thai marketing content, achieving 97.2% accuracy on the task.

Frame alignment — 18 chars/sec Thai reading speed

Subtitle timecodes are snapped to scene cuts and speaker transitions. For Thai, line-length and display-duration calculations use 18 chars/sec — lower than English's 21 chars/sec — to account for the visual density of Thai combining characters and vowel marks. This prevents subtitles from flashing past before viewers can read them.

Export & delivery — SRT/VTT with th-TH locale tag

Output files are exported as UTF-8 SRT or VTT with the th-TH locale tag, ensuring correct rendering on YouTube, TikTok, Facebook Video, and Meta Ads Manager. DOCX voice-over scripts and XLSX LSP handoff exports are also available for regulated content requiring human review.

No spaces between words — segmentation is non-trivial

Thai script (อักษรไทย) has no spaces between words — word boundaries are implicit. For subtitle generation, the AI must correctly segment continuous text into display-ready subtitle lines. AdTransPro's Thai NMT model runs a dedicated word segmentation pass before applying line-length and reading-speed constraints, achieving 97.2% segmentation accuracy on marketing video content.

Thai reading speed: 18 chars/sec

Thai subtitles are calibrated to 18 characters per second — lower than English (21 chars/sec) due to the visual density of Thai script characters and combining vowel marks. AdTransPro enforces the 18 chars/sec norm automatically for th-TH output, keeping subtitle lines readable at standard video playback speeds.

Polite particles — ครับ (male) vs. ค่ะ (female)

Thai uses sentence-final polite particles: ครับ (krap) for male speakers and ค่ะ (kha) for female speakers. For B2B marketing content and corporate video, formal ครับ/ค่ะ usage signals professional register. AdTransPro applies these contextually based on source speaker context — and allows glossary overrides to pin a preferred form for brand-consistent output.

Formal Standard Thai vs. Central Thai colloquial

Formal Standard Thai (ภาษาไทยมาตรฐาน) is used in national broadcasting, corporate communications, and B2B marketing. Central Thai colloquial is appropriate for social video ads targeting younger urban audiences. AdTransPro defaults to Standard Thai (th-TH) for subtitle output; glossary overrides allow register adjustments for social ad campaigns.

UTF-8 Thai Unicode block: U+0E00–U+0E7F

All Thai characters — consonants, vowels, tone marks, and numerals — fall within the Thai Unicode block (U+0E00–U+0E7F). UTF-8 encoding is required for correct rendering across YouTube, TikTok, Facebook Video, and Meta Ads Manager. AdTransPro exports all Thai SRT and VTT files in UTF-8 by default. Regional awareness: while Central Thai is the national standard, Northern Thai (Lanna / ภาษาเหนือ) is a distinct regional language — AdTransPro targets th-TH Standard Thai, not Lanna dialect.

Upload your video

Drag-drop your MP4, MOV, or WebM file — or paste a YouTube, TikTok, or Facebook Video URL directly. AdTransPro accepts files up to 10 GB and translates from 145+ source languages into Thai.

Auto-detect source language

Source language is detected automatically with token-level timestamps for accurate subtitle timing. Override if your recording switches between languages — common for Thai content that mixes English brand names or technical terms.

Select th-TH (Thai) as target language

Choose Thai (th-TH) as your target language. Thai can be combined with other target languages in the same upload — AdTransPro generates all outputs in parallel at no extra processing time.

Review segments in the inline editor

The inline editor highlights confidence-flagged segments. For Thai output, verify that word segmentation boundaries look natural and that brand terms and proper nouns are correctly handled — pin these in your glossary to lock preferred forms. Check polite particle consistency (ครับ/ค่ะ) before export.

Export SRT / VTT / DOCX / XLSX

Export UTF-8 SRT or VTT for YouTube, TikTok, Facebook Video, and Meta Ads Manager. DOCX exports provide Thai voice-over scripts for dubbing workflows. XLSX exports support LSP review handoff for regulated content requiring human sign-off.