Simple, fast online tools
VPN leak test, game ping, public IP, speed estimate, word counter and more — free in the browser.
Start here
Highest-intent tools first — privacy, network, and everyday counters.
- Popular
VPN Leak Test
Test WebRTC leaks and public IP visibility for your VPN.
Use tool → - Popular
Game Ping
Estimate HTTP latency to game-related edges worldwide (not the same as in-game client ping).
Use tool → Speed Test
Estimate download, upload, latency and jitter with a light browser HTTP test.
Use tool →Privacy Score
See how fingerprintable your browser is — signals collected only on your device.
Use tool →My IP
See your public IP address and approximate network location.
Use tool →Peripherals Test
Test keyboard, mouse, microphone, and webcam in the browser.
Use tool →
Guides by topic
Jump into device, network, or gaming tool clusters.
All tools
22 tools found
VPN Leak Test
Test WebRTC leaks and public IP visibility for your VPN.
Game Ping
Estimate HTTP latency to game-related edges worldwide (not the same as in-game client ping).
Speed Test
Estimate download, upload, latency and jitter with a light browser HTTP test.
Privacy Score
See how fingerprintable your browser is — signals collected only on your device.
My IP
See your public IP address and approximate network location.
Peripherals Test
Test keyboard, mouse, microphone, and webcam in the browser.
Keyboard Tester
Test every key online — live key and code display in your browser.
Mouse Tester
Test left, right, middle click and scroll wheel online.
Webcam Test
Preview your camera in the browser — local only, no upload.
Character Counter
Free character counter with and without spaces — plus words and lines.
Case Converter
Convert to UPPERCASE, lowercase, Title Case, camelCase, snake_case and more.
Text Tools
Word and character counter, case converter, slugify — free in the browser.
Word Counter
Free online word counter — also counts characters, lines and sentences.
CS2 Ping Test
Estimate browser HTTP latency toward CS2 / Steam CDN edges.
LoL Ping Test
Estimate browser HTTP latency toward League of Legends-related edges.
Valorant Ping Test
Estimate browser HTTP latency toward Valorant-related edges.
Microphone Test
Check your mic level in the browser — audio never leaves your device.
Device Info
Overview: battery, network, and hardware — with links to specialized tools.
Display & System
Resolution, viewport, OS, language, timezone, and theme — read in your browser.
Battery Level
See your laptop or phone battery level in real time.
Connection Type
Find out if you're on 4G, 5G, Wi-Fi, or a slow connection.
RAM & Cores
How many CPU cores and how much RAM your device has.
What these tools measure — and what they can't
Nothing here needs an account, and nothing you check is stored. The measurement code runs in your browser and the result is discarded when you close the tab — which is also why there is no history, no export and no dashboard. If a tool could quietly keep your readings, that promise would be worth nothing.
A browser cannot inspect your machine directly. It reports what the web platform chooses to expose, and that varies by browser, by operating system and by privacy settings. When an API is missing, blocked or returns something impossible, the tool prints "unavailable" and stops. It never fills the gap with a number that merely looks right — the rule, and the reason for it, is written out on the methodology page.
The catalogue is grouped by the question you arrived with: is something wrong with this device, with this connection, with the game, with a peripheral, or is a counter disagreeing with the field you are pasting into. A guide sits in front of each group, so you can start from the symptom instead of guessing which tool applies.
Some things we deliberately do not publish. The CPF and CNPJ generators were taken down in July 2026 — checking a number someone gave you is useful, manufacturing new ones is a different business, so the validator stayed and the generators went. That is the kind of trade this site makes on purpose.
About StackNest
StackNest is published by an identifiable operator, and every tool here runs where you can see it: in your own browser tab. There are 22 tools in English, all of them finished — no placeholder pages, no "coming soon" slots waiting to be filled.