Free browser-based Windows diagnostics
Crash dumps, error reports, certificates, registry files — decoded on the spot, your files never leave your computer.
Drop any Windows file here
We identify it by its bytes — not just the name — and open it in the right tool: crash dumps, .wer reports, certificates, .reg files, anything. Nothing is uploaded.
Choose file(s)The tools
BSOD Analyzer
Read your blue-screen crash dump and get the guilty driver plus a fix plan.
App-Crash Reader
Decode .wer reports and app-crash minidumps — which program died and why.
Certificate Decoder
Inspect certificates, chains, CSRs, keys and .pfx bundles — locally.
.reg File Viewer
See what a .reg file actually does — and whether it looks safe to run.
File Identifier
Don't know what a file is? Drop it — we identify it by its bytes.
Never uploaded
Every parser runs in your browser and reads only the byte ranges it needs. Watch the network tab — no file bytes leave.
Nothing to install
No WinDbg, no SDKs, no desktop utilities from 2009. A browser tab is the whole toolchain.
Instant & honest
Verdicts come with the evidence behind them and an honest confidence rating — never false certainty.
Why we built this
Every Windows diagnostics question ends the same way: "upload your file here" or "install this tool". Uploading a crash dump or a certificate to a stranger's server is exactly what a careful technician — or a careful anybody — shouldn't do. Modern browsers can parse these formats locally, so we built the whole toolbox that way, paired each tool with a reference library that explains what you're looking at, and kept it free.