Proof, not promises.
Every one of our 1070 tools runs locally in your browser unless it is clearly marked as cloud-powered. Here is how to check that claim yourself.
01 — Prove it yourself
The DevTools recipe
- Open DevTools with F12 and switch to the Network tab.
- Run any local tool — compress a PDF, convert an image, solve a calculation.
- Watch the Network tab: 0 bytes uploaded. No file payloads, no fetch or XHR requests carrying your document.
- Run an AI tool instead and you will see exactly one API call — a POST to
/api/ai/generate(or/api/ai/generate-image), named right there in the request list for you to inspect.
02 — Confidential files
Traffic lights for sensitive documents
GREEN — go ahead
Local-only tools. Your files never leave the device.
PDF, image, calculator, and converter tools.
AMBER — redact first
Sent to third-party APIs and possibly provider-logged.
AI tools, transcription, translation, URL shortener, currency rates. Remove secrets before submitting.
RED — never paste
Passwords, API keys, and recovery seeds.
Never paste these into any website — including ours.
03 — Safety model
How Toolzum stays safe by default
- No signup to start. Tools work immediately, with no account standing between you and your task.
- No stored files. Local tools never upload anything; cloud requests are processed without retaining your documents.
- Human-approved reviews. Testimonials and reviews shown on the site pass human approval before publication.
Read the full details in our Privacy Policy, Security, and FAQ pages.
Frequently asked questions
How can I verify that my files never leave my device?
Open DevTools (F12) → Network tab → run any local tool. You will see zero bytes uploaded: no file payloads, no fetch or XHR requests carrying your document. This works for every local PDF, image, calculator, and converter tool on Toolzum. (The Photo Editor's 'AI Describe' feature is the exception — it sends a downscaled preview to our API.)
What network traffic do AI tools make?
AI tools make calls to /api/ai/generate (text), /api/ai/generate-image (image generation), /api/ai/transcribe (audio/video transcription) and /api/ai/describe-image (image description). Transcription and image description carry your file bytes; text and image generation carry your prompt. You can name and inspect each call in the Network tab before you run anything sensitive.
Can I paste confidential work documents into Toolzum?
For GREEN (local-only) tools, yes — processing happens entirely in your browser. For AMBER tools (AI, transcription, translation), your input is sent to a third-party API and may be logged by that provider, so redact secrets first. Never paste passwords, API keys, or recovery seeds anywhere — that is RED, always.
Do I need an account, and is anything stored?
No signup is needed to start using local tools, and Toolzum stores no files: local tools never upload anything, and AI requests are processed without retaining your documents on our side (providers may log them). Reviews shown on the site are human-approved before publication.
How many tools does this promise cover?
All of them — every one of the 1070 tools on Toolzum follows the same model: local-first processing, clearly marked cloud features, and nothing uploaded silently in the background.