Developer tools that JUST work.

Formatting an API response or inspecting a token does not need a server round-trip. ByteKiln parses and transforms tool input in your browser, so you can inspect a payload without uploading it to a processing service.

JWT claims and Base64 strings are readable data, not encryption. Use sample values when troubleshooting, and verify a token's signature, issuer, audience, and time claims in your application before trusting it.

JSON formatting, hashing, and JWT inspection run locally. The website still loads scripts, fonts, and page analytics. Optional share links contain a readable copy of your input and output; see privacy and sharing for the details.

The other common alternative — a CLI tool, an IDE extension, a language-specific library — solves the privacy problem but adds an install, an update cycle, and a context switch just to check one token or reformat one payload. ByteKiln sits in between: nothing to install, nothing uploaded for processing. Open a tab, let the tool load, and work with your input locally.

If you write backend code that talks to JSON APIs, C# → JSON and JSON Formatter save you from writing sample payloads by hand or squinting at an unindented response. If you touch a design system, Color Palette is for checking whether a hardcoded hex value actually passes contrast — not just for generating new ones. If you ship anything other people download — a script, a widget, an installer — Hash Generator gives you a checksum without opening a terminal. And if you maintain an email template or embed a widget on someone else's page, HTML Minifier and CSS Minifier trim the markup and stylesheet before it ships.

None of this requires an account. You paste something in, you get something out, and the tab can be closed the moment you're done — that's the whole interaction.

Every page on ByteKiln is static — there's no API route sitting behind a tool waiting for your input. SHA-1, SHA-256, SHA-384, and SHA-512 hashing runs through crypto.subtle, the browser's Web Crypto API. MD5 uses a separate JavaScript implementation and supports text only. HMAC JWT signature verification also uses Web Crypto.

You can check this yourself without trusting a word of it: open DevTools, switch to the Network tab, load the tool and its dependencies, then format a sample JSON payload. The payload is processed locally; page-resource and analytics requests are separate. Tools can work locally after loading, but a cold start or a dependency such as SQLite's WebAssembly engine needs a connection. ByteKiln is not an offline-installable application.