Your files never leave your browser.
ToolkitDev is a free, open-source collection of developer utilities that run entirely client-side. No uploads. No accounts. No data retention. Just tools that work.
We built it because we were tired of pasting sensitive JWTs, API responses, and internal images into random third-party websites and hoping for the best. There is a better way.
- free tools
- 16+
- categories
- 4
- uploaded to our servers
- 0 bytes
- accounts required
- 0
How it actually works
No server magic. No hidden middlemen. Here's the plain-English version of what happens when you use a tool.
You open a tool page
Next.js ships the tool's JavaScript to your browser. After that, the processing logic lives entirely on your device. We serve HTML, CSS, and JavaScript — nothing more.
You drop a file or paste your data
Your input is read by browser-native APIs — the
FileAPI,Canvas, or theTextDecoder— directly in the tab. No fetch, no XHR, no WebSocket to a backend.The tool processes it locally and returns the result
Image compression uses the Canvas API. JSON formatting uses native
JSON.parse. QR codes are rendered with a client-side library. The result appears in your browser instantly.You download or copy the output
Downloads use the browser's
URL.createObjectURLAPI — a temporary link created locally in memory, discarded when you close the tab. Nothing is written to our filesystem.
Our commitments
These aren't aspirational guidelines. They're hard constraints baked into the architecture.
Your files never leave your browser
Every image, document, and piece of code you process stays on your device. We have no servers receiving your data — not because we say we don't, but because there is no endpoint to send it to.
Zero tracking, zero analytics profiling
We don't embed user-behaviour trackers, session-replay scripts, or hidden pixels. We may serve ads (clearly labelled), but we never sell or share data about what you do with our tools.
No account, no sign-up, no paywall
Open the tool, use it, close the tab. There is no free-tier trap, no feature gate, and no email-capture popup. Every tool is available to everyone, always.
Nothing is stored server-side
We don't cache your inputs. We don't log your outputs. When you close the tab, your data is gone. That's the point.
Works offline after first load
Because the processing logic ships to your browser, most tools continue working without a network connection once the page has loaded. Handy on a plane or a flaky connection.
Open source & auditable
The full source is publicly available. If you don't trust our word, read the code. Every tool is inspectable — no obfuscation, no hidden payloads.
Don't trust us — read the code.
ToolkitDev is fully open source. Every tool, every utility hook, every line of processing logic is available to inspect, fork, and contribute to.
If you find a privacy issue, a bug, or just a better way to do something — open an issue or send a pull request. The source is the spec.
- MIT-licensed — use it however you like
- No build-time obfuscation — readable source in production
- Contributions welcome — issues & PRs are open
- Self-host it if you need an air-gapped setup
No BS.
The web is full of "free" tools that make you sign in, collect your email, upload your data to parse it server-side, and then spam you with upgrade prompts. We think that's a bad deal for developers.
ToolkitDev was built with a single constraint: if it can run in the browser, it must run in the browser. That rules out the entire class of lazy server-side implementations that exist only so the provider can log your data.
We keep the UI fast, the pages simple, and the marketing copy honest. There's no social proof carousel, no "50,000 developers trust us" counter we made up, and no countdown timer on a discount.
Just tools. That work. For free. In your browser.
What we value
- Speed over polish
- Privacy over convenience
- Simplicity over features
- Honesty over growth hacks
Ready to use a tool?
No account needed. No time limit. Just pick a tool and start.