Free browser-based Windows diagnostics

1. Drop the file. It stays on the

   Parsing happens on a background thread in your browser using byte-range reads, so only the parts of the file we need are touched. A 16 GB MEMORY.DMP is handled the same way as a 300 KB minidump, and there is no size limit because nothing is being sent anywhere.

2. Read the verdict and the evidence

   You get one plain sentence saying what went wrong, then a fix plan in order, then every observation with the source field it came from. When the evidence is thin the confidence drops and the report tells you which part is a guess. That is why ntoskrnl.exe gets explained as

3. Take the report with you

   Copy it, download it, or print it as Markdown or plain text, then paste it into a forum thread or a support ticket. You are handing over a readable report instead of a dump file full of your own memory contents.

1. BSOD Dump Analyzer

   Read a blue-screen minidump or MEMORY.DMP in the browser. Returns the stop code, the blamed driver, a fix plan and the evidence behind it, and explains why ntoskrnl.exe is usually the victim rather than the root cause.

2. WER and App Crash Reader

   Open Windows Error Reporting files and app-crash minidumps to find the faulting module and exception code. Explains that a .wer file is a summary, not a full dump.

3. Certificate Decoder

   Decode SSL and X.509 certificates, CSRs, keys and PFX files to show subject, issuer, expiry, SANs and fingerprints. Works offline, so there is no revocation check and the issuer signature is not proven against a trusted root.

4. .reg File Viewer

   Read a registry file before you run it, with the keys, value types and locations laid out in plain language. Never stamps a file safe, and notes that a merge cannot be undone.

Frequently Asked Questions

Do you upload my dump file anywhere?

No. Your browser opens the file from disk and the parser reads byte ranges out of it on a background thread. Nothing is sent to us, nothing is stored, and closing the tab is the end of it. That is the whole reason the site exists.

Is there a size limit on a MEMORY.DMP?

No. Because we never transfer the file, there is no upload cap to hit. We seek to the parts of the dump we need, so a 16 GB MEMORY.DMP is read in the same way as a small minidump.

Is ntoskrnl.exe the cause of my crash?

Usually not. The Windows kernel is often the module that notices the damage and calls the bug check, so it ends up named in the dump while a driver further down the stack is the real problem. The report explains which role each module is playing.

Can you tell me if a certificate has been revoked?

No. The certificate decoder runs offline in your browser, so there is no revocation lookup, and the issuer signature is not proven against a trusted root store. You get subject, issuer, expiry, SANs and fingerprints, which is enough to answer most questions.

Does viewing a .reg file mean it is safe to merge?

No, and the viewer never says that. It shows you the keys, value types and locations in plain language so you can decide. Merging is your call, and a merge cannot be undone.