JNRT Pixel
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About the author

Jonathan „JonArt“ Hedderich

Trained graphic-design technical assistant (GTA) · 11+ years of experience

Jonathan — known online as JonArt (jnrt) — is a trained graphic-design technical assistant who has worked with images for the web for more than 11 years: compression, formats, load-time optimization. JNRT Pixel grew out of that hands-on practice — so the work happens locally in the browser, with no upload.

jonart.me →

Focus areas

For more than 11 years my work has circled the same question: how do you make images as small as possible without anyone noticing? The expert articles on this site come out of that practice — and so do the JNRT Pixel tools themselves.

  • Image compression — JPG, PNG, WebP, AVIF, GIF and SVG at the right quality sweet spot.
  • Formats & conversion — which format when, and how to switch without quality loss.
  • Web performance — load time, Largest Contentful Paint and Core Web Vitals.
  • Browser-local tools — image processing with no server, no upload, no account.

Compress images locally — no upload, no privacy risk

This page is deliberately built to work with, too: you can compress images right here — including internal, sensitive or as-yet-unpublished shots. The decisive difference from many online compressors: your images never leave your device. All processing runs locally in your browser via the Canvas API — there is no server that receives images.

Why it matters: anyone who uploads an image to someone else's server gives up control — and has no idea what happens to it there, how long it's stored, or who has access. That's exactly where a data-protection problem arises, especially with personal or confidential images. With this platform that problem does not exist — no upload, no account, no sharing. You can verify it yourself in your browser's network tab: not a single upload request goes out while compressing.

Expert articles

More on how the site works and its transparency: About & editorial.