About PrismNook

PrismNook makes quick, private image tools for everyday jobs: shrinking a photo for an application form, resizing for social media, opening iPhone photos on Windows, or turning scans into a PDF. Most online image tools upload your pictures to their servers. Ours don't, because your browser can do the work itself.

How our tools work

Every tool on PrismNook runs inside your web browser. When you open a file, your own device does the work using built-in browser technology and WebAssembly. Nothing is uploaded, so the tools are fast, work with large files, and keep your files private.

Free, without sign-ups

You'll never need an account or an email address. The site is paid for by ads, which we keep out of the way of the tools themselves.

Who we are

PrismNook is built and maintained by BlueEra. We'd love to hear which tool you'd like next, or about anything that doesn't work: get in touch.

More free tools from us

• WaveNook: free mic test, voice recorder, audio cutter and converter.

Open-source software

PrismNook is built with Preact, heic-to HEIC decoder, pdf-lib, UPNG.js, pako, fflate, signature_pad, Dancing Script font, Great Vibes font, Caveat font, Allura font. Thank you to their authors. See the open-source licences for versions, source code and licence texts.