Why this exists
Most single-purpose online tools follow the same pattern. You paste something in, the page posts it to a server, the server does the work and posts a result back. For formatting a scrap of JSON that is unremarkable. For a JWT from your production environment, a customer list in CSV, or a photograph you would rather not distribute, it is a genuine problem — you have handed a stranger's server a copy and you have no way to know what happened to it.
Almost none of that work needs a server. Browsers have had a capable cryptography API, canvas-based image processing, file reading, and fast JSON and XML parsers for over a decade. The obstacle was never technical; it is that server-side processing is easier to monetise and easier to instrument.
OmniTool was built the other way round. Every tool on the site is JavaScript that runs in the tab you have open. Once the page has loaded, you can disconnect from the internet and keep working. There is no upload endpoint, no processing queue and no database of submissions, because there is nowhere for your input to go.
What is here
Sixty tools, in ten groups:
- Developer and code — JSON and XML formatting, Base64, URL and HTML entity encoding, hashing, regular expressions, JWT inspection, Markdown, UUIDs.
- Browser and network — what your browser reveals about you, IP and geolocation lookup, request headers, DNS records, an HTTP status code reference.
- Text — counting, case conversion, diffing, deduplication, placeholder text, speech synthesis and dictation.
- AI — summarising, paraphrasing, grammar fixing and code explanation, using an API key you supply and that never leaves your browser.
- Converters — units, timestamps, number bases, CSV and JSON, colour notations, currencies, time zones.
- Generators and security — passwords, strength analysis, barcodes, random data.
- Calculators — body mass index, exact ages, percentages.
- Design — colour palettes, CSS gradients, image conversion and compression, QR codes, SVG optimisation, favicons.
- Finance — SIP, lumpsum, EMI, compound interest, retirement and inflation, each with the formula written out.
- Webmaster and SEO — robots.txt, XML sitemaps, .htaccess snippets, meta tags, structured data.
The full list lives on the tools directory.
How it is built
OmniTool is a static site. There is no application server, no user accounts and no database. The pages are plain HTML, CSS and JavaScript served from a CDN, which is why they load quickly and keep working offline once cached.
A small number of tools do make network requests, and they are the ones that inherently cannot avoid it: IP geolocation has to ask a service what your public address is, DNS lookup has to query a resolver, and currency conversion has to fetch published exchange rates. Each of those tools says so on its own page. The AI tools call whichever provider you have configured, directly from your browser, using your own key.
Everything else — every formatter, every calculator, every image operation — runs with no network access at all.
How it is funded
OmniTool is free and has no paid tier. It is supported by advertising, served through Google AdSense. That is the whole business model, and it is worth being clear about what it implies.
Advertising means a third party — Google and its partners — sets cookies in your browser and may use them to select ads. It does not mean the content you type into a tool is shared with anyone: the ad code cannot read the contents of the tool panels, and there is no server-side copy for us to pass on. The privacy policy sets out the details, including how to opt out of personalised advertising.
We do not sell data, we do not run affiliate links inside tool results, and we do not put a tool behind a paywall after you have started using it.
On accuracy
The financial calculators implement standard, published formulas, and each page shows the formula it uses along with its assumptions. They are planning aids: they assume a constant rate of return, ignore taxes and fees unless stated, and cannot predict markets. Nothing on this site is financial advice — see the disclaimer.
The technical tools aim to match the specifications they implement. If you find output that is wrong, the fastest way to get it fixed is to tell us, ideally with the input that produced it.
Getting in touch
Bug reports, corrections, suggestions for new tools and advertising enquiries all go to contact@omnitools.website, or through the contact page. Requests for a new tool genuinely do get read — a good number of the utilities here started as an email.
Frequently asked questions
No. There are no accounts, no sign-up and no email wall. Every tool is available immediately.
Yes, all of it. The site is funded by advertising rather than subscriptions, and no tool is limited, watermarked or capped.
Mostly. OmniTool is a progressive web app, so once a page has been loaded it is cached and continues to work without a connection. The exceptions are the tools that need a live service: IP geolocation, DNS lookup, currency rates and the AI tools.
Yes. Because nothing is uploaded, the tools are usable in environments where pasting data into an external service would breach policy. If your organisation needs written confirmation of that, the privacy policy states it explicitly.