Free AI Tools Online
AI-assisted tools for summarization, paraphrasing, grammar correction, alt-text generation, prompt scaffolding, and content adaptation. Most run locally on bundled small models.
3 free tools — browser-based, no sign-up required.
AI Summarizer
NEWSummarize text using AI
Paraphraser
NEWRephrase text using AI
Prompt Generator
NEWGenerate AI prompts
About FlexyPdf AI Tools
The AI tools here are pragmatic rather than ambitious — small models that handle one specific job well, not a general chat assistant. Where it is technically feasible, they run entirely in your browser using WebAssembly-compiled inference engines and bundled model weights, which means your text never leaves the device. Where a task genuinely needs a larger model (e.g. high-quality summarization of a long document), the request goes through a backend that processes the input and deletes it immediately afterwards.
The summarizer extracts key sentences and condenses passages to a target length, with three modes (extractive, abstractive, bullet points). The paraphraser rewrites a passage while preserving meaning, with tone controls (formal, casual, academic). The grammar checker is broader than the text-section spell checker — it catches grammar and style issues, suggests rewrites for awkward sentences, and explains its reasoning. The alt-text generator produces accessible image descriptions; the prompt generator scaffolds clear, structured prompts for LLM use.
A note on AI output quality: these tools are useful but not infallible. The summarizer can occasionally lose nuance; the paraphraser sometimes changes meaning subtly; the grammar checker can flag stylistic choices that are actually correct. Treat the output as a starting point that you review and edit — not as final copy.
Who uses these tools
A few of the recurring use cases we hear about from FlexyPdf visitors.
Students and researchers
Summarizing a long paper, paraphrasing source material into your own words, generating alt text for figures in a thesis.
Content writers and editors
Generating first-draft summaries of long articles, checking and rewriting awkward sentences, producing meta description variants.
Accessibility teams
Generating descriptive alt text for site imagery as a starting point for human review.
Prompt engineers and LLM users
Scaffolding structured prompts with clear role/context/instruction sections.
Frequently asked questions
Do the AI tools send my text to OpenAI, Anthropic, or another third party?
No. The tools either run on small bundled models in your browser, or — for the few that require a larger model — go through a private backend that processes and deletes the input. There is no third-party AI provider in the request chain.
How good is the AI output compared to ChatGPT or Claude?
These are smaller, task-specific models and are not as good at open-ended generation as large frontier models. For the narrow tasks they target (summarize, paraphrase, grammar), the quality is usable but you should review the output before publishing it.
Are the bundled AI models open-source?
Where possible, yes — most are derived from publicly released models. License information is included in the page footer for each tool that uses one.