Free AI API Key Guide (Gemini, Groq, OpenRouter)

No Google Gemini API key yet? It takes about 60 seconds:

Example guide

Free · No credit card

Open Google AI Studio and sign in with your Google account.
Click "Create API key" → pick a project (or use the default one).
Copy the string starting with AIza… and paste it into the field below.

Free, no credit card required. Free-tier limits are per minute/day and reset at midnight Pacific time.

Groq

No Groq API key yet? It takes about 60 seconds:

Free · No credit card

Open the Groq Console (sign up with Google/GitHub).
Click "Create API Key" and give it any name.
Copy the gsk_… string and paste it into the field below.

Free plan with no credit card. Limits are per model (requests/minute, tokens/minute).

OpenRouter

No OpenRouter API key yet? It takes about 60 seconds:

Free · No credit card

Open OpenRouter, sign in and go to the Keys section.
Click "Create Key" and name the key.
Copy the sk-or-v1-… string and paste it into the field below.

Free models (ids ending with :free) are available with per-minute and per-day request caps.

Ollama (local)

No Ollama (local) API key yet? It takes about 60 seconds:

Free · No credit card

Install Ollama on your machine and open a terminal.
Run: ollama pull llama3.3 (or qwen2.5:7b on low-end machines).
Allow this website to call Ollama using the OLLAMA_ORIGINS variable, then pick Ollama above.

# Windows (PowerShell) — chạy rồi khởi động lại Ollama
setx OLLAMA_ORIGINS "https://boxtool.cc,http://localhost:3000"

# macOS / Linux
OLLAMA_ORIGINS="https://boxtool.cc" ollama serve

# Tải model
ollama pull llama3.3

Summarize text AI translator Grammar fixer Explain code Text to SQL Image alt text

Completely free, no API key, your data never leaves your machine.

Custom endpoint

No Custom endpoint API key yet? It takes about 60 seconds:

Paid

Paste the base URL of an OpenAI-compatible endpoint (Cloudflare Worker, one-api, LiteLLM, LM Studio…).
Enter the model name exactly as the endpoint expects.
Paste the API key (if required) and click Connect.

The endpoint must allow browser calls (CORS). This is how you can use OpenAI without exposing your key to this site.

Security notes

Create a dedicated key for web use and set a spend limit in the provider's console.
Do not use your main account key or a key with admin permissions.
Never paste keys into chat boxes, screenshots or messages.
If a key may be exposed, revoke it and create a new one immediately.

BoxTool never stores, logs, or transmits your key to any server.

Got a key? Start now

AI Code Explainer

Paste code and get an AI explanation: what it does, how each part works, potential bugs and improvement ideas. Supports JavaScript, TypeScript, Python, Java, C#, Go, PHP, SQL.

AI Code Explainer

Paste code and get an AI explanation: what it does, how each part works, potential bugs and improvement ideas. Supports JavaScript, TypeScript, Python, Java, C#, Go, PHP, SQL.

AI Grammar Fixer & Rewriter

Fix Vietnamese and English spelling and grammar with AI, rewrite sentences for clarity or change the tone — with a list of what changed. Uses your own API key.

AI Grammar Fixer & Rewriter

Fix Vietnamese and English spelling and grammar with AI, rewrite sentences for clarity or change the tone — with a list of what changed. Uses your own API key.

Random Team Generator

Split a list of players into random balanced teams for football, basketball, badminton or any group activity. Shuffle instantly and copy results in one click.

Random Team Generator

Split a list of players into random balanced teams for football, basketball, badminton or any group activity. Shuffle instantly and copy results in one click.

PDF to Text Extractor

Extract text from PDF files online free. No upload, no server. Fast OCR-free PDF text extraction directly in your browser. Privacy guaranteed.

PDF to Text Extractor

Extract text from PDF files online free. No upload, no server. Fast OCR-free PDF text extraction directly in your browser. Privacy guaranteed.