Translate English to Thai

Free English to Thai translator with a formal or informal register and names kept exactly as you wrote them.

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Type, paste or upload a document. The source language is detected automatically. Select a name or term and tap Keep to leave it untranslated.

Your translation will appear hereChoose the target language, add your text, then press Translate. Click any sentence in the translation for alternatives.

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English to Thai translator

English to Thai translation with the register set first

Paste English and get Thai back with the register set the way you want it. Thai politeness rides on sentence-ending particles: ครับ (khrap) for a male speaker and ค่ะ / คะ (kha) for a female speaker, with pronoun choice adjusting to status. The selector decides the vocabulary and sentence shape before the translation is made, and any name or term you mark as kept is passed through untouched.

How to translate English to Thai

Three steps. The second is the one most translators skip.

Paste or upload the English

Type, paste or drop in a document. English is already selected as the source on this page; if the text turns out to be something else, the detector says so above the editor and you can change it.

Set the register and mark the names to keep

Pick Formal or Informal from the register selector beside the language names, or leave it on Match source tone to follow the English original. Select any name, brand or product term and press Keep so it is passed through as written.

Translate, then check it

Read the Thai if you can. If you cannot, back-translate it: run the result through Thai to English and compare the meaning, sentence by sentence, with what you started from.

What changes between English and Thai

The differences that decide whether a translation reads as written by a person.

Script and directionEnglish is written in Latin; Thai in Thai. Names cross between scripts by sound, which is why freezing them matters.
Word orderEnglish is subject-verb-object; Thai is subject-verb-object. The orders match, which removes one whole class of error, but idiom and agreement still have to be handled.
How politeness is markedThai politeness rides on sentence-ending particles: ครับ (khrap) for a male speaker and ค่ะ / คะ (kha) for a female speaker, with pronoun choice adjusting to status. Formal Thai uses different vocabulary again, including royal and monastic registers.
Formality in EnglishEnglish has no separate polite and familiar 'you'. Register lives in vocabulary and sentence shape instead: 'Could you let me know' against 'Tell me', 'purchase' against 'buy'.

Where translation into Thai goes wrong

Three things Thai readers notice at once, and a machine has to be told about.

No spaces between words

Thai is written without spaces between words; the reader segments the sentence, and a system that segments wrongly changes the meaning.

Particles depend on the speaker

The polite particle depends on the speaker's gender, which an English source does not state; the translation has to be told or it guesses.

No verb inflection

Thai has no verb inflection for tense or person; 'I went', 'I go' and 'I will go' differ only by time words a translator has to add.

What has to be read correctly in the English first

Errors that start on the source side, before a single Thai word is chosen.

'You' is ambiguous

'You' is ambiguous: one person or several, a friend or a stranger. Translators guess, and a guess in the wrong direction is the single most common way an English original lands badly.

Stacked nouns

English piles up nouns ('customer data retention policy'); most languages need those unpacked into phrases, and a literal rendering is unreadable.

Phrasal verbs and idioms

Phrasal verbs ('put up with', 'look into') and idioms are translated word by word by weaker systems.

Who translates English to Thai here

Messages to Thai suppliers, hotels and colleagues.

Thai coursework.

Reading Thai product pages, forms and news.

English to Thai translator FAQs

Is the English to Thai translator free?

Yes. Translate English to Thai without an account, within the per-run word allowance shown beside the editor. Signing in raises it, and Pro removes the guest limits and the ads. The pricing page lists what each plan includes.

How does the register selector work for Thai?

Thai politeness rides on sentence-ending particles: ครับ (khrap) for a male speaker and ค่ะ / คะ (kha) for a female speaker, with pronoun choice adjusting to status. Formal Thai uses different vocabulary again, including royal and monastic registers. The selector still matters: Formal produces the vocabulary and sentence shapes a Thai reader expects in official or business writing, Informal the everyday ones, and Match source tone keeps whatever the English original was doing.

Will it translate names, brands and product terms?

Not unless you want it to. Select a name or a term in the editor and press Keep, and it is passed through exactly as written. This matters for English to Thai because names are otherwise re-spelled in Thai script by sound, and two runs can spell the same name two ways.

How accurate is machine translation from English to Thai?

Good enough to understand a document, answer an email or draft a reply, and it improves when you set the register and mark the names as kept first. It is not a substitute for a human translator on a contract, a medical document or anything with legal weight. The reliable way to check a translation you cannot read is to back-translate it: paste the Thai result into a new run set to English and see whether the meaning survived.

Can I translate a whole document from English to Thai?

Yes. Drop in a .docx, .pdf or .txt file, or paste the text; the output keeps the paragraph structure and can be copied, edited in place or exported.

Can I translate Thai back into English?

Yes. Press the swap button between the two language names to reverse the direction, or set the languages by hand; every one of the 124 languages can be the source or the target.

After the translation

Check the English before you translate it, or shift the register of the result once it is in Thai. One plan covers every tool.

Grammar checker Tone changer Paraphraser Summarizer All 124 languages

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Popular language translations

Each pair opens the translator with both languages already set. The register and the Keep button work the same on every one.