About yutils
yutils is a free, search-first collection of developer and everyday utilities you can use instantly in your browser.
yutils brings together the tools you reach for most — JSON formatter, Base64 encoder, JWT decoder, and more — on a single static / SSR site. No install, no signup; land on a tool from a search result and start using it immediately. yutils is a free project operated by jdgrid (Republic of Korea).
Operating principles
Data is processed in your browser
Whenever possible, conversions and computations run in client-side JavaScript, and your input is not sent to any server. This is the default for privacy, speed, and operating cost. Tools that genuinely need an external API show a clear badge at the top of the page.
Designed around search-first entry
Most users arrive by typing something like 'json formatter' into Google and landing directly on a tool page. Every tool gets its own URL, meta tags, OG image, and JSON-LD structured data, and the actual tool UI is visible above the fold — no long preamble.
White background by default + 12 light theme presets
A plain white background is the default to keep long sessions easy on the eyes, paired with 12 curated light theme presets and a dark mode. Your selection lives in browser localStorage and is never sent to a server.
Free, minimal ads, no sign-in
yutils is free to use without any sign-up or login. To cover hosting costs, ads may appear on some pages — but only in positions that don't crowd out the tool UI above the fold.
Tech stack
Next.js App Router · React · Tailwind CSS · next-intl · Cloudflare Workers (@opennextjs/cloudflare). Heavy libraries are loaded lazily per tool so they never bleed into other tool pages.
Contact
Email the maintainer — the buttons below open a pre-filled template.
support@jdgrid.com