A good summary preserves the argument while cutting the volume. This tool takes any document — an article, a report, a contract, a research paper — and uses your own OpenAI or Anthropic key to compress it into a faithful summary at the length and format you choose. Everything runs in your browser; your key never touches a Gera server.
How it works
Choose a provider and model, paste your API key, drop in your document, and pick a summary length (short, medium, or detailed) and a format (paragraph, bullets, or TL;DR). The tool builds a structured summarisation prompt that tells the model exactly how long the output should be, how to shape it, and — critically — to stay faithful to the source without inventing facts. It then sends one direct request to the provider and returns the summary for you to copy.
For Anthropic, the request includes the official direct-browser-access header so the call works straight from the page.
When to use which length
- Short — a 2-3 sentence gist for triage or a Slack message.
- Medium — a one-paragraph abstract for a reading list or email digest.
- Detailed — 2-3 paragraphs that retain nuance for review or hand-off.
Tips
- For documents longer than the model’s context window, summarize sections separately, then summarize the combined summaries.
- The cheaper models are more than capable of summarisation — there is rarely a reason to pay for a flagship model here.
- Always sanity-check numbers, names, and dates against the original; summarisation is faithful but not infallible.