13 tools · nothing to pay · nothing to install
Free online tools that run in your browser
Format JSON, edit images, build a resume, generate QR codes, draw diagrams, convert units, hash a file. Everything runs on your own machine — no sign-up, no uploads, no watermarks, no catch. Open a tool and start.
100% Free
Every tool, every feature. Nothing is held back, now or later.
No Sign-Up
No account, no email, no login. Open a tool and start working.
No Credit Card
Never asked for, because there is nothing here to buy.
No Free Trial
Nothing expires. It isn't free for now — it's just free.
No Pro Tier
No premium plan. No feature that turns out to be paid once you click download.
No Watermarks
Exports are clean and full quality, yours to use commercially.
13 tools shown
Developer
Diagram, format, diff, decode — the everyday developer bench.
Mermaid Studio
Write Mermaid diagrams, preview live, export PNG/SVG, and share with a link.
JSON Formatter
Format, validate, and minify JSON with live error checking and one-click download.
Code Compare
Compare two code snippets or files with a clear, color-coded diff, side-by-side or unified.
Base64 & URL Encoder/Decoder
Encode and decode text with Base64 or URL encoding instantly, entirely in your browser.
Regex Tester
Test, debug, and validate regular expressions with live match highlighting, captured groups, and flags.
Converters & Calculators
Units, loans, and dates worked out instantly.
EMI Calculator
Calculate your loan EMI, total interest, and total repayment, with a full amortization schedule.
Unit Converter
Convert between length, weight, temperature, area, volume, speed, time, pressure, energy, power, storage, and more — instantly.
Age & Date Calculator
Calculate your exact age, the difference between two dates, or add and subtract days, weeks, months, and years from a date.
Security & Privacy
Strong passwords and checksums, generated on your machine.
Image & Media
Edit images and build QR codes without an upload.
Text & Documents
Count, analyse, and build documents in the browser.
Why all of this is free
Because it costs almost nothing to run. Every tool executes in your browser, not on a server — so one visitor and a hundred thousand visitors cost the same to serve. There are no per-user compute bills to pass on to you.
Because there are no accounts. No accounts means no user database, no password resets, no billing system, and no support queue. The parts of a web app that get expensive are the parts Omnibus doesn’t have.
A single unobtrusive ad slot covers hosting. That’s the whole business model. No tool will be moved behind a login, capped by a credit balance, or reserved for a “pro” tier — and your work will never be watermarked or held hostage at the export step.
Frequently asked questions
- Is it really free?
- Yes — every tool, every feature, with no trial period and no usage limits. There is no paid tier to upsell you to, and nothing is held back behind one. A single unobtrusive ad slot covers hosting.
- Do I need an account?
- No. There is no sign-up, no login, and no email capture anywhere on the site. Open a tool and use it. Because there are no accounts, there's also no database of users to leak.
- Do my files get uploaded?
- No. Every tool runs entirely in your browser using JavaScript — your files, text, and images are processed on your own machine and never sent anywhere. You can confirm this by opening your browser's network tab, or by disconnecting from the internet after the page loads.
- Can I use these tools for commercial work?
- Yes. There are no restrictions on what you do with the output, and nothing is watermarked. Resumes, QR codes, diagrams, and edited images are yours to use however you like.
- Does anything get saved between visits?
- Only in your own browser. Some tools keep a local draft or a short history in localStorage so your work survives a refresh — that data stays on your device and can be cleared any time. The one exception is a Mermaid share link, which saves a snapshot only when you explicitly click Share.