Great Circle Distance
Get a free API key + new tools as they ship
100 calls/day, no card, no spam. Built by one person, in public.
About Great Circle
Great Circle was built for the moment you just need to handle this task and move on — no signup, no upload to a third-party server. Everything happens client-side, which means your files and data never leave your machine. The interface is intentionally minimal so you can focus on the task instead of learning the tool. Like everything else in the utility collection, it is free, ad-light, and works on mobile as well as desktop.
When you'd reach for Great Circle
You're cleaning up a folder of files that accumulated over a project and need to standardize them.
Designers, writers, and developers wrapping up deliverables.
Drop each file in, copy the output, move on.
You're on a public or shared machine and don't want to leave traces of what you're working on.
Travelers, contractors, anyone working from a friend's computer.
Nothing is uploaded, nothing persists if you're not signed in.
You're hitting the daily limit of a paid SaaS and need a backup option for a single quick job.
Marketers and ops people whose primary tool is metered.
Stay productive without burning credits.
You need to handle a one-off task right before a meeting and don't have time to install anything.
Anyone working remotely on a borrowed or restricted machine.
Open the page, get the result, paste it into your doc — under a minute.
Frequently asked about Great Circle
- Do I need to create an account to use Great Circle?
- No. Great Circle works without any signup. We only ask for an email if you decide to subscribe to a paid plan.
- Can I use Great Circle commercially?
- Yes. The output of Great Circle belongs entirely to you, with no licensing restrictions.
- Does Great Circle work on mobile?
- Yes, Great Circle is fully responsive and tested on iOS Safari and Android Chrome.
- Is Great Circle really free?
- Yes — Great Circle is free for unlimited personal use, with no account required and no watermark on the output.
- What browsers does Great Circle support?
- Every modern browser released in the last three years: Chrome, Firefox, Safari, Edge, Brave, Opera.
