The privacy-verified workflow toolkit
OneDevToolkit is more than 300 free utilities. We help developers chain local tools into recipes, keep secrets on-device, and prove processing never left the browser with privacy receipts.
Why we built this
Most online tool sites quietly upload your input to a server, sprinkle in analytics, or lock useful features behind a login. If you have ever pasted an API key into a random base64 decoder and immediately regretted it, you already know the problem.
Privacy-first claims are table stakes now — every clone says the same thing. We go further: Recipe Studio for multi-step workflows, privacy receipts you can download and verify, and workflow hubs that solve jobs (JWT debug, PDF privacy, GitOps) instead of dumping a directory of isolated tools.
No accounts required for core tools. Your files stay on your device. That is the product — not just the marketing line.
AI & LLM utilities
Token counters, cost estimators, context planners and embedding calculators for GPT-4o, Claude, Gemini and more.
Explore AI tools →JSON tools
Format, validate, diff and convert JSON — eight focused utilities for everyday API work.
Explore code tools →Security tools
Password testers, JWT decoders, hash generators, CSRF helpers and CORS header builders.
Explore security tools →Git helpers
Gitignore generators, commit message formatters, branch name builders and README scaffolding.
Explore developer tools →CSS generators
Visual builders for gradients, shadows, animations, flexbox and grid layouts.
Explore CSS tools →Converters
Units for CSS, data size, time, typography and screen resolution — all in one place.
Browse converters →Text tools
Case converters, diff checkers, regex testers and lorem ipsum generators.
Explore text tools →Image tools
Compress, resize, crop and inspect EXIF metadata — processed locally in your browser.
Explore image tools →PDF studio
Merge, split, compress and convert PDFs without sending documents to our servers.
Explore PDF tools →Unique differentiators
HAR summarizer, secrets redactor, OpenAPI→Postman, privacy receipts, and system/break utilities you rarely find free and local.
Browse the directory →Our privacy commitment
- Processing happens locally in your browser — not on our servers.
- We do not store, log or analyse the text and files you paste into tools.
- No account is required to use the core toolkit.
- We use privacy-conscious analytics (Google Tag Manager / GA4) to understand traffic patterns — never tool contents. Read our Privacy Policy and Cookie Policy for details.
Tools that respect your workflow
Developers and creators switch between a dozen cluttered websites just to format JSON or generate a hash. We wanted one calm, fast place where utilities feel polished — not like a billboard.
That is the mission behind OneDevToolkit: practical tools, thoughtful design, and privacy as a default — not a premium feature.
Browse all toolsWhat guides us
Speed first
Tools should open instantly and respond without lag.
Privacy by default
Your input stays on your machine. We cannot see it — by design.
Free for everyone
Core utilities remain free. Useful software should not hide behind a paywall.
How it's built
OneDevToolkit is a multi-page site built with Vite, deployed on Netlify, and styled with a custom design system. Tool logic runs client-side using standard browser APIs and modern JavaScript — Web Crypto, Canvas, File API and similar — so nothing sensitive needs to cross the network.
We keep dependencies lean, ship often, and prefer boring, reliable technology over flashy stacks that slow you down.
Accuracy & updates
We review tools regularly — especially data that changes often, like AI model pricing and token limits. When something drifts out of date, we patch it. Found a bug or a wrong default? Contact us or open an issue — we read every message.
New tools and improvements ship based on what people actually use. Check the changelog to see what landed recently.