Numerical Aperture
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100 calls/day, no card, no spam. Built by one person, in public.
About Num Aperture
Num Aperture is a free, browser-based utility designed to make this task as quick and frictionless as possible. The goal was to keep the path from "open the page" to "get the result" as short as possible. No mandatory account, no cookie wall, no upsell at every step. It is one of about a hundred utility tools that share the same philosophy: do one thing, do it well, get out of your way.
When you'd reach for Num Aperture
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.
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 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.
Frequently asked about Num Aperture
- Will Num Aperture change my original file?
- Never. Num Aperture only reads your input file and produces a new output file.
- What browsers does Num Aperture support?
- Every modern browser released in the last three years: Chrome, Firefox, Safari, Edge, Brave, Opera.
- Can I use Num Aperture commercially?
- Yes. The output of Num Aperture belongs entirely to you, with no licensing restrictions.
- Are my files uploaded to a server when I use Num Aperture?
- Num Aperture processes everything in your browser using local APIs. Your files never leave your device.
- Does Num Aperture work on mobile?
- Yes, Num Aperture is fully responsive and tested on iOS Safari and Android Chrome.
