Where does my API key go?

It stays in your browser and is sent only in the direct request to OpenAI or Anthropic. It is never stored, logged, or transmitted to any Gera server. The call goes straight from your browser to the provider's API.

Will it change the facts in my text?

The instruction explicitly tells the model to preserve all factual content and only change tone, structure, and word choice. Always proofread the result, since any rewrite can subtly shift meaning, but the prompt is designed to keep claims intact.

Which tones are available?

Formal, casual, assertive, empathetic, concise, and playful. Each maps to a specific instruction. You can also see the character-count difference to gauge whether the rewrite expanded or tightened the text.

Why does each rewrite cost money?

The rewrite is a real API call billed to your own account at your provider's per-token rate. Costs are tiny for short passages but scale with length, so trim very long inputs or use a cheaper model like GPT-4o mini or Claude Haiku.

Tone Adjuster (BYO-key)

Rewrite text in any tone, with your own key

Sometimes a draft says the right thing in the wrong voice — too stiff for a landing page, too breezy for a legal notice. The Tone Adjuster takes a piece of text and a target tone and rewrites it while keeping the facts intact, using your own OpenAI or Anthropic API key so nothing passes through a third party.

How it works

You paste your API key, your text, and pick a tone. The tool builds an instruction that tells the model to rewrite the passage in the chosen tone while preserving every factual claim, then calls the provider’s REST endpoint directly from your browser — OpenAI’s chat completions or Anthropic’s messages API. It shows the rewritten text next to a character-count diff so you can see whether the new tone expanded or tightened the copy. Loading and error states are handled explicitly, and your key is never stored.

Tips for good rewrites

Pick a cheaper model for drafts. GPT-4o mini and Claude Haiku rewrite tone well at a fraction of the cost of the flagship models.
Proofread for meaning drift. A tone change can subtly reframe a claim — always read the result against the original.
Keep inputs focused. Rewriting one paragraph at a time gives tighter, more controllable results than dumping an entire document.
For documents too long to fit in context, summarize first, then adjust tone on the summary.