Online Tools
Simple, fast, private tools for text, color, image, time and encoding. No sign-up. Everything runs in your browser.
Start here — the tools people reach for most
Every tool below runs the same way: open the page, do the thing, close the tab. Nothing is uploaded, nothing is tracked, and there is no account to create.
Color
Image
Time
Encoding & Crypto
API
How FastKit works
FastKit is a set of small, single-purpose utilities for people who work with text, code, colors and images. Instead of one bloated application, each task gets its own focused page: convert a timestamp, decode a JWT, recolor an icon, resize a batch of photos, or generate a hundred UUIDs. You never install anything and you never sign in.
The defining choice behind the whole site is privacy by design. Almost every tool — the hash and cipher utilities, the image editor, the QR generator, the scratchpad — runs entirely inside your browser using JavaScript and the Web Crypto API. The text you paste, the files you drop and the keys you generate are processed on your own machine and never travel to a server. That is not a marketing line: open your browser’s network tab while you work and you will see no request leaves your device.
Because the work happens locally, the tools are fast and they keep working on a bad connection. Many of them keep working even after you go fully offline, and any history or drafts that need to survive a refresh are stored in your browser’s own storage, which you can wipe at any time.
The site is available in ten languages and every page — including the long explanations under each tool — is translated, not machine-spun. It is maintained by an independent developer who adds tools when real people ask for them, and the changelog records what changed and when.
Frequently asked questions
Do I need to create an account or pay?
No. Every tool on FastKit is free to use with no sign-up, no trial limits and no feature locked behind a paywall. You can open any page and start immediately.
Is my data uploaded to a server?
Almost never. The encryption, hashing, image, encoding and text tools all run locally in your browser, so the data you paste or drop is processed on your own device and is never transmitted. A handful of tools that inherently need the network — like the API tester, the WebSocket tester or the IP lookup — only talk to the endpoint you point them at.
Do the tools work offline?
Many do. Because the logic is client-side, tools such as the color converter, hash generator, UUID generator and scratchpad keep working with no internet connection once the page has loaded. Your saved blocks and history live in your browser’s local storage.
Who is behind FastKit?
It is built and maintained by an independent developer who makes privacy-first web utilities. The About page explains the motivation, and the Contact page has a real email address that a human reads.
How do you make money if everything is free?
Advertising helps cover hosting and domain costs. Ads are served conservatively, never interrupt a tool while you are using it, and you can opt out of personalized ads through the Ad settings link in the footer if you are in a region covered by consent rules.
I found a bug or want a new tool — what do I do?
Use the contact page. Feedback, bug reports and tool requests are all read, and new tools are added regularly based on what people actually ask for. The changelog lists recent additions and fixes.