AI Letter Writer
Commercial use OK
380+ models
No watermark
No sign-up needed
Model:
+ GPT-5, Claude, Gemini
Draft a properly formatted letter with sender + recipient address blocks, today\'s date auto-inserted, salutation, body and sign-off. Pick the letter type (business / legal demand / recommendation / resignation / complaint / apology / congratulations / condolence / cover / reference), tone, and length. Outputs US block format by default — toggle UK or German conventions if needed.
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Write formal and informal letters with AI.
How to Use AI Letter Writer
1
Enter your input
Type text, upload a file, or describe what you want. No account needed.
2
Click generate
Our AI processes your request in seconds using the best open-source models.
3
Download & share
Download, copy, or share your result. Free for personal and commercial use.
Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen7b", "messages": [{"role": "user", "content": "Write a short story about a lost robot."}]}'AI Letter Writer — FAQ
Business letters, legal/demand letters, recommendation letters, resignation letters, cover letters (for jobs — use the dedicated /write/cover-letter/ tool), complaint letters, apology letters, reference letters, and formal correspondence. We auto-insert today's date and format an address block + salutation + body + sign-off per standard letter conventions.
Grammarly Premium and ProWritingAid are editors — they fix what you wrote. Free.ai writes the first draft from your brief. Use Free.ai to produce the letter, then drop it into Grammarly/ProWritingAid for a final pass. Complementary, not competing.
Yes: sender address block (if you provide it), date, recipient address block, salutation ("Dear Mr./Ms./Dr. Lastname,"), body paragraphs, complimentary close ("Sincerely," / "Respectfully," / "Best regards,"), signature line. Formal business and legal letters default to block format (everything left-aligned).
No AI-generated letter is automatically legally binding — it is a draft. For legal/demand letters, have an attorney review before sending, especially if it's a formal demand, cease-and-desist, or anything that could end up in court. Free.ai letters are a 10x faster starting draft, not legal advice.
Yes: formal, professional, warm, firm, apologetic, congratulatory, sympathetic, or assertive. The salutation and sign-off change based on tone — a firm legal letter uses "Sincerely," while a sympathy note uses "With deepest condolences,".
It puts your typed name on the signature line. You still need to sign the printed copy by hand, or use Free.ai's PDF signer at /pdf/sign/ to add a typed or drawn signature to the downloaded document.
Recommendation letters and condolence letters. For recommendations, paste specific stories / accomplishments of the person — vague recs are obvious and hurt the candidate. For condolences, paste the relationship + a specific memory — generic sympathy reads hollow. The AI can't make something specific up; you supply the specifics, it handles the formatting and tone.
Your signed-in account auto-fills from your profile. For anonymous users, the form remembers your last session via localStorage. Nothing is stored on our servers unless you are logged in.
The AI knows US, UK, Commonwealth, and European business-letter conventions. Specify "UK format" or "German Geschäftsbrief format" in the brief and it adjusts: UK uses full stops after titles, Germany uses "Sehr geehrte/r..." and a closing per DIN 5008, etc.
Most business letters: 150-350 words (1 page). Legal demand letters: 300-500 words. Recommendation letters: 300-500 words. Resignation letters: 80-150 words (keep it short, professional, and non-burning-bridges). Free.ai's length picker maps directly to these norms.
Yes — all 50+ languages, with proper native conventions (salutations, date formats, honorifics). Pick a premium model (Claude, GPT, Gemini) for best non-English fluency on long or formal letters.
Yes — /api/ exposes /v1/chat/ with custom system prompts for any letter type. Great for HR tools, legal software, and CRM plugins that need automated correspondence.
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