Tamil grammar checking, one suggestion at a time
Thiruttham checks formal written Tamil in two layers: fixed rules that run in your browser, and an AI-assisted check for mistakes that depend on meaning. It proposes small edits, shows the reason for each, and changes nothing until you accept.
Replace the sample below with your own Tamil and press Check. The box runs the fixed rules only; agreement between subject and verb and similar-sounding letters need the AI-assisted check, which needs a sign-in.
Try it on real Tamil
This demo runs the free rule checks in your browser. Your text is not sent to our servers. Text is sent for AI-assisted checks only if you sign in. Sign in for AI-assisted checks
Real corrections
Each text below is corrected by the fixed rules exactly as shown, and the corrected text needs nothing more from them. The texts are written for this page. The Tamil spelling rules explain each rule on its own page.
| Before | After | Made by | Reason |
|---|---|---|---|
| தங்களின் கோரிக்கையை பரிசீலித்து, விரைவில் நடவடிக்கை எடுக்கப்படும் என தெரிவித்து கொள்கிறேன். | தங்களின் கோரிக்கையைப் பரிசீலித்து, விரைவில் நடவடிக்கை எடுக்கப்படும் எனத் தெரிவித்துக் கொள்கிறேன். | Fixed rules | After an object ending in ஐ, the next hard consonant doubles. After ஆக or என the next hard consonant doubles. After certain verb forms that lead into the next verb, the next hard consonant doubles. |
| மாவட்ட ஆட்சியர் அனைத்து பள்ளிகளுக்கும் நாளை விடுமுறை என தெரிவித்தார். | மாவட்ட ஆட்சியர் அனைத்துப் பள்ளிகளுக்கும் நாளை விடுமுறை எனத் தெரிவித்தார். | Fixed rules | After அனைத்து the next hard consonant doubles. After ஆக or என the next hard consonant doubles. |
| நாங்க நேத்து அவகிட்ட பேசினோம். இப்ப எனக்கு ஒண்ணும் புரியல. | நாங்கள் நேற்று அவளிடம் பேசினோம். இப்போது எனக்கு ஒன்றும் புரியவில்லை. | Fixed rules (written forms of spoken words, a setting) | A listed spoken word is written in its standard form. |
| அவர் எல்லாவற்றையும் தெரிந்துக் கொண்டார். | அவர் எல்லாவற்றையும் தெரிந்து கொண்டார். | Fixed rules | A consonant written by mistake after certain verb forms is taken away. |
| அவர் திருமணத்திற்கு அதிகம் சிலவு செய்தார். | அவர் திருமணத்திற்கு அதிகம் செலவு செய்தார். | Fixed rules | A standard spelling. |
What the AI-assisted check adds
- Similar-sounding letters: ர and ற, ல and ள and ழ, ந and ண and ன.
- Agreement between subject and verb, in gender and in number.
- Spoken forms that have a written form, beyond the short list the fixed rules use.
One of these look-alike groups already has a reference page: Tamil words that differ by one letter lists each pair with its meaning and an example sentence, so you can see which word you meant.
It needs a sign-in. On the free plan the first 5 AI corrections of each day are open, and the AI reads the first 500 words of a text; further suggestions are marked with a dotted underline so you can see where they are. You can start a 7-day trial of Pro yourself, once, with no payment needed, and Pro is ₹299 a month or ₹2,799 a year. The pricing page has the details.
What it will not do
- Change your text without your click.
- Change words on your protected list, such as names.
- Rewrite, translate or draft text for you.
- Promise to be right every time. The AI can propose a change to a word that is correct; that is why every change is yours to accept or dismiss.
Can I correct Tamil grammar in my browser?
Yes, in two ways. The web editor and the free check box on this page run in the browser. The Chrome extension checks the text box you are writing in, such as Gmail or WordPress. The AI-assisted check needs a sign-in.
Is Tamil grammar checking free?
The fixed rule checks are free and unlimited, and need no account. The AI-assisted check needs a sign-in. On the free plan the first 5 AI corrections of each day are shown in full, the AI reads the first 500 words of a text, and further suggestions are marked with a dotted underline. You can start a 7-day trial of Pro yourself, once, with no payment needed. The pricing page has the details.
What is the difference between the rules and the AI?
The rules are written code that runs in your browser and gives the same answer every time. The AI-assisted check tries to flag mistakes that depend on meaning, such as similar-sounding letters and agreement between subject and verb. It can be wrong, and it shows only the edits it is confident about. Every suggestion says which one made it.
Which Tamil grammar mistakes does the free check find?
The fixed rules find missing consonant doubling (ottru) after certain words, standard spellings and colloquial words, replaced by their written form. Mistakes that depend on meaning, such as agreement between subject and verb, need the AI-assisted check after sign-in. Neither layer is always right.
Will it change my text without asking?
No. It never changes a word on your protected list, such as a name. It proposes small edits with the reason for each, and nothing changes until you accept it. You can undo an accepted change straight away.
Can it be wrong?
Yes. Both the rules and the AI can be wrong. You can dismiss any suggestion, add a word to your protected list so it is never changed, or report a wrong correction.
Does it rewrite or translate my text?
No. It only proposes small corrections to the text you wrote.