Processing boundary
Input is processed only in the active browser tab's memory and is not sent to a ByteQuant server.
51
Code & file security
Local File Risk Pre-Scan
Inspects filename, size, magic bytes, MIME consistency, and risky text patterns in-browser without executing or uploading the file. It is not antivirus and cannot conclusively detect or clear new, packed, or complex malware.
✓ Free✓ No account✓ In-browser
QUICK ANSWER
What does this tool do?
Inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading. Local File Risk Pre-Scan limitation: Code is not executed, and no finding does not prove the absence of vulnerabilities.
- Input
- For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.
- Output
- When Local File Risk Pre-Scan finishes, it returns a downloadable new file, size and format metrics, and disclosed processing limits, organised around the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.
- Method
- Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original.
- Verification
- Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.
TOOL-SPECIFIC RUN PLAN
Go to the workbench ↓See exactly what Local File Risk Pre-Scan expects and returns
Local File Risk Pre-Scan uses the contract below to complete “Initial triage of a downloaded file: local analysis with Local File Risk Pre-Scan” in particular. Confirm the shape with the example first; use real data only when the fields and expected result are clear.
- Use this shape
1 · Prepare the input
Local File Risk Pre-Scan — For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.. Choose only a file you are authorized to inspect. Expected format for Local File Risk Pre-Scan: For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..
- Method applied
2 · Run the operation
Local File Risk Pre-Scan — Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original. Run the size-bounded local scan; the file is never opened or executed. Local File Risk Pre-Scan applies this method: Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original.
- Expected output
3 · Read the result
Local File Risk Pre-Scan — When Local File Risk Pre-Scan finishes, it returns a downloadable new file, size and format metrics, and disclosed processing limits, organised around the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.. Extension/signature mismatch checks: validating the Local File Risk Pre-Scan output
- Acceptance check
4 · Accept or correct
Local File Risk Pre-Scan — Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.. If findings are suspicious, isolate the file and verify with a current professional security product. Acceptance check for Local File Risk Pre-Scan: Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..
A tool-specific example path
1. Initial triage of a downloaded file: local analysis with Local File Risk Pre-Scan → 2. Extension/signature mismatch checks: validating the Local File Risk Pre-Scan output → 3. Macro and script indicator search: checking the limits of Local File Risk Pre-Scan
Tip: when an example-data button is available, run it first. Do not use the result in a live process unless it passes the acceptance check.
Result
Your result will appear here.
Persistent storage
Input and output are not stored. The optional usage counter keeps only tool identity and count, never content.
Verification
Output comes from disclosed rules or browser APIs and needs independent review before high-impact use.
APPLICATION AND DECISION GUIDE
✓ REVIEWEDUse Local File Risk Pre-Scan with the right input, acceptance check, and next step
Inspects filename, size, magic bytes, MIME consistency, and risky text patterns in-browser without executing or uploading the file. It is not antivirus and cannot conclusively detect or clear new, packed, or complex malware. The notes below help you do more than produce a result: they show how to test whether Local File Risk Pre-Scan fits the task and when to stop before a weak output travels further.
Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original. Code is not executed; only static patterns and contracts are inspected. No finding does not prove the absence of a vulnerability.
For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading. Confirm the shape first with a small example containing no personal data.
When Local File Risk Pre-Scan finishes, it returns a downloadable new file, size and format metrics, and disclosed processing limits, organised around the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading. — Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.
Three practical use cases
Initial triage of a downloaded file: local analysis with Local File Risk Pre-Scan
Action: Start with a small synthetic fixture that represents this need. Expected input: For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..
Acceptance signal: The fixture should reproduce “Initial triage of a downloaded file: local analysis with Local File Risk Pre-Scan” without real personal data.
Extension/signature mismatch checks: validating the Local File Risk Pre-Scan output
Action: Keep that fixture unchanged and run the on-device method: Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original.
Acceptance signal: Identical input should return the same result, with no network or file action assumed beyond the disclosed method.
Macro and script indicator search: checking the limits of Local File Risk Pre-Scan
Action: Retain the output record before moving it into the target workflow: When Local File Risk Pre-Scan finishes, it returns a downloadable new file, size and format metrics, and disclosed processing limits, organised around the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..
Acceptance signal: Acceptance requires Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.; otherwise do not move the result forward.
Do not use the result for a decision beyond this boundary: Local File Risk Pre-Scan limitation: Code is not executed, and no finding does not prove the absence of vulnerabilities.
Move the result to another tool or live process only after Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading.. Keep this limit visible in the decision record: Local File Risk Pre-Scan limitation: Code is not executed, and no finding does not prove the absence of vulnerabilities.
A result in three steps
- 01
Choose only a file you are authorized to inspect. Expected format for Local File Risk Pre-Scan: For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..
- 02
Run the size-bounded local scan; the file is never opened or executed. Local File Risk Pre-Scan applies this method: Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original.
- 03
If findings are suspicious, isolate the file and verify with a current professional security product. Acceptance check for Local File Risk Pre-Scan: Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..
When is this tool useful?
- ✓ Initial triage of a downloaded file: local analysis with Local File Risk Pre-Scan
- ✓ Extension/signature mismatch checks: validating the Local File Risk Pre-Scan output
- ✓ Macro and script indicator search: checking the limits of Local File Risk Pre-Scan
Tool-specific limitation
Local File Risk Pre-Scan limitation: Code is not executed, and no finding does not prove the absence of vulnerabilities.
LEARN THE WORKFLOW
Guides for this tool
Designing a Browser PWA That Feels Like a Real App
Explain install, offline behavior, storage, and file limits through user tasks rather than technical jargon.
Read guide →Browser File Risk Scanning: Magic Bytes, Double Extensions, and Real Limits
Inspect extension, signature, macro, and bounded content signals without executing a file—and do not confuse triage with antivirus verification.
Read guide →ABOUT THIS TOOL
Frequently asked questions
What input does Local File Risk Pre-Scan accept?+
For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading. Choose only a file you are authorized to inspect. Expected format for Local File Risk Pre-Scan: For Local File Risk Pre-Scan, provide local file or files of a supported type within the disclosed size limit. The requested outcome is to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..
What does Local File Risk Pre-Scan return?+
When Local File Risk Pre-Scan finishes, it returns a downloadable new file, size and format metrics, and disclosed processing limits, organised around the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading. Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original.
How should I validate Local File Risk Pre-Scan output?+
For “Initial triage of a downloaded file: local analysis with Local File Risk Pre-Scan”, first complete “Run the size-bounded local scan; the file is never opened or executed. Local File Risk Pre-Scan applies this method: Local File Risk Pre-Scan uses this disclosed method to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading: the file is read in browser memory and a new output is created without overwriting the original.”, then apply this check: “If findings are suspicious, isolate the file and verify with a current professional security product. Acceptance check for Local File Risk Pre-Scan: Before accepting a Local File Risk Pre-Scan result, complete preserving the original and checking that output opens correctly, retains expected pages or frames, size, and visible quality; the evidence should support the goal to inspect extension, signature, double extension, macro indicators, and bounded content samples without uploading..”. Do not use a consequential result before a second test with boundary or malformed input.
Does this tool send or store input on a server?+
No. Processing runs in this browser tab and tool input is not persisted. Copying, downloading, or transferring happens only when you choose it.