Duct Size

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About Duct Size

Duct Size solves a specific problem that comes up daily for anyone dealing with this task: doing it once, fast, without an account. Processing runs locally in your browser using modern Web APIs. Nothing is uploaded, nothing is logged, and there is no quota to worry about for casual use. If you find yourself doing this regularly, the rest of the utility suite covers most adjacent tasks with the same approach.

When you'd reach for Duct Size

  • 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'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 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 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 Duct Size

Do I need to create an account to use Duct Size?
No. Duct Size works without any signup. We only ask for an email if you decide to subscribe to a paid plan.
Are my files uploaded to a server when I use Duct Size?
Duct Size processes everything in your browser using local APIs. Your files never leave your device.
Is Duct Size really free?
Yes — Duct Size is free for unlimited personal use, with no account required and no watermark on the output.
What browsers does Duct Size support?
Every modern browser released in the last three years: Chrome, Firefox, Safari, Edge, Brave, Opera.
Can I use Duct Size commercially?
Yes. The output of Duct Size belongs entirely to you, with no licensing restrictions.

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