File Risk Score Calculator
Upload any file to calculate its security risk score - a comprehensive assessment based on file type, embedded macros, script content, URL links, Shannon entropy, extension mismatches, and metadata anomalies. Each risk factor is analyzed independently and weighted to produce a final score from 0 (Safe) to 100 (Critical). See exactly what contributes to the score with detailed findings and actionable recommendations. All processing runs locally in your browser - no uploads, no signup, completely free.
Upload any file to calculate its comprehensive security risk score. The tool analyzes file type, embedded macros, URL links, Shannon entropy, extension mismatches, and more - all processed locally in your browser with no server uploads.
Drop any file here or click to browse
Supports all file types - analyzed entirely in your browser
Why Use Our File Risk Score Calculator?
Multi-Factor Risk Assessment
Our calculator evaluates 7 weighted risk factors: file type risk, extension mismatch, Shannon entropy, macro/VBA detection, URL link analysis, file size anomalies, and Office document risk. Each factor is scored independently for a comprehensive security assessment.
100% Private Browser-Based Analysis
Your files never leave your device. All analysis - magic byte detection, macro scanning, URL extraction, entropy calculation, and risk scoring - happens locally in your browser using the Web Crypto API and JSZip. No server uploads, no data logging.
Supports All File Types
Upload any file type - executables, Office documents, PDFs, images, archives, scripts, and more. The risk analysis adapts based on the detected file format, applying the most relevant checks for each type.
Actionable Recommendations
Every risk factor includes a detailed finding and a specific recommendation. The visual risk gauge (0-100) with color-coded severity (Safe to Critical) helps you quickly understand the threat level and take appropriate action.
Common Use Cases for File Risk Score Calculator
Pre-Attachment Security Check
Before opening an unexpected email attachment, run it through the risk score calculator. A high-risk score (especially extension mismatches or macro detection) could indicate a phishing attempt or malware delivery.
Downloaded File Verification
After downloading a file from an unfamiliar website or peer-to-peer source, check its risk score. The entropy analysis and magic byte detection can reveal packed executables or disguised file types that may be malicious.
Corporate File Security Screening
IT and security teams can quickly screen files before allowing them onto corporate networks. The detailed factor breakdown provides documentation-ready risk assessments for security compliance and auditing.
Document Intake Risk Assessment
Legal firms, financial institutions, and government agencies that receive document submissions can pre-screen incoming files. The tool detects macro-enabled documents and embedded URLs that could pose security risks.
Educational Cybersecurity Training
Use the risk score calculator to demonstrate file security concepts in cybersecurity training. Show how different file types, macros, entropy levels, and extension mismatches contribute to the overall risk score in real-time.
Incident Response Triage
During security incident response, quickly triage suspicious files found on compromised systems. The risk score provides a fast, quantifiable assessment of each file to prioritize forensic analysis and containment actions.
Understanding File Risk Assessment
What is a File Risk Score?
A file risk score is a quantitative assessment of how dangerous a file might be, expressed as a number from 0 (completely safe) to 100 (extremely dangerous). Our File Risk Score Calculator evaluates seven independent risk factors, each weighted by its relative importance in security analysis. The result is a comprehensive, reproducible risk assessment that helps you make informed decisions about whether to open, execute, or trust a file. Unlike signature-based antivirus detection (which only catches known threats), risk scoring can flag suspicious behavior patternseven in files that don't match any known malware signature.
How the Risk Score is Calculated
- 1File Type Analysis (20% weight): The extension and magic bytes are checked against a risk database. Executables (.exe, .elf), scripts (.ps1, .vbs), and macro-enabled documents (.docm, .xlsm) receive higher base risk scores. Images, fonts, and text files receive lower scores.
- 2Extension Mismatch (15% weight): The declared file extension is compared against the true file type detected from magic bytes. A mismatch - such as a .jpg that is actually a ZIP file or an EXE - significantly increases the risk score, as this is a common malware disguise technique.
- 3Macro/VBA Detection (18% weight): Office documents are scanned for embedded VBA macros (vbaProject.bin). Macros can execute arbitrary code when the document is opened, making them a primary malware delivery vector. Auto-execute macros like Auto_Open are particularly dangerous.
- 4Additional factors: Entropy analysis (12%) detects packed or encrypted content that may hide malicious code. URL link analysis (12%) finds embedded links and flags suspicious domains. File size anomalies (8%) identify unusually large or small files. Office document risk (10%) combines macro, URL, and structural analysis specific to Office files.
Understanding the Results
- Total Score (0-100): The final composite score displayed on the gauge. Each severity level maps to a recommendation: Safe (0-10, no precautions needed), Low (11-30, standard caution), Medium (31-50, verify source), High (51-75, scan with antivirus), and Critical (76-100, do not open unless absolutely certain of origin).
- Factor Breakdown: Each risk factor shows its individual score (0-100), severity badge, detailed finding, and an actionable recommendation. Factors with high scores are highlighted in red/orange for immediate attention.
- Warnings: Critical findings such as extension mismatches, VBA macro detection, or suspicious URLs are shown as prominent warning banners at the top of the results for instant visibility.
- Summary Stats: Quick-reference cards show file size, detected type, entropy value, macro status, and URL count at a glance.
Important Limitations
The File Risk Score Calculator is a heuristic analysis tool, not a replacement for dedicated antivirus or malware detection software. It identifies suspicious patterns and risk indicators but cannot detect all types of malware or zero-day exploits. A low risk score does not guarantee a file is safe - only that it lacks common risk indicators. Conversely, a high risk score does not automatically mean a file is malicious - legitimate software installers and macro-enabled documents from trusted sources may score high. Always use multiple layers of security and exercise caution when handling files from unknown or untrusted sources. The tool processes files entirely in your browser - no data is transmitted over the network.
Related File Security Tools
File Magic Byte Detector
Detect true file type by reading magic bytes
File Extension Validator
Check if file extension matches content type
Phishing Link Detector in Documents
Scan documents for malicious embedded URLs
Password Protected File Detector
Check if a file is encrypted or password-protected
Macro/VBA Detector
Scan Office documents for embedded macros
Hidden Content Detector
Find hidden content in Office documents
Frequently Asked Questions About File Risk Score Calculator
A file risk score calculator analyzes a file for multiple security risk factors and calculates a composite score from 0 (safe) to 100 (critical). The tool examines file type risk, embedded macros, script content, URL links, Shannon entropy (to detect packed/encrypted content), extension mismatches, file size anomalies, and Office document features. Each factor is weighted and scored independently to produce a final risk assessment with actionable recommendations.
The risk score is calculated by evaluating 7 weighted factors: file type risk (20%), extension mismatch (15%), entropy analysis (12%), macro/VBA detection (18%), URL link analysis (12%), file size anomalies (8%), and Office document risk (10%). Each factor receives an individual score from 0-100, which is multiplied by its weight. The weighted scores are summed and normalized to produce a final score from 0-100, which maps to a severity level: Safe (0-10), Low (11-30), Medium (31-50), High (51-75), or Critical (76-100).
No. The File Risk Score Calculator processes everything locally in your browser using the Web Crypto API, JSZip, and JavaScript. Your files never leave your device - no server upload, no data logging, no third-party requests. All analysis happens entirely on your machine for complete privacy.
The tool supports all file types. The risk analysis adapts based on the file type - executables (.exe, .dll, .elf) are scored for high file type risk, Office documents (.docx, .xlsx, .pptx, .docm, .xlsm) are scanned for macros and embedded URLs, archives (.zip, .rar, .7z) are checked for compression/packing, and all files undergo entropy analysis and extension mismatch detection.
Yes. For Office Open XML documents (DOCX, XLSX, PPTX, DOCM, XLSM, PPTM), the tool scans the internal ZIP structure for vbaProject.bin files, which indicate embedded VBA macros. When macros are detected, the file risk score increases significantly since VBA macros are a common malware delivery mechanism used in phishing attacks and targeted breaches.
Shannon entropy measures the randomness or unpredictability of file content on a scale from 0 to 8 bits per byte. High entropy (>7.5) indicates the file is likely compressed, encrypted, or packed - techniques commonly used by malware to evade signature-based detection. Low entropy (<4) suggests plain text or simple structured data. Entropy analysis helps identify potentially malicious packed executables and encrypted payloads that might otherwise appear benign.
The tool reads the file's magic bytes (the first few bytes of binary data that identify the true file format) and compares them against the declared file extension. If a file claims to be a .jpg but its magic bytes indicate it's actually a ZIP or EXE file, this is flagged as an extension mismatch - a common technique used to disguise malicious files and bypass security filters.
Yes - 100% free, forever. No signup, no account, no premium tier, no usage limits, and no ads. Analyze as many files as you need. All processing is done locally in your browser with zero server uploads.
Yes. After analysis, the tool displays a comprehensive breakdown showing each risk factor, its individual score (0-100), severity level, a detailed finding description, and a specific recommendation. A visual gauge shows the total score with color-coded severity, and any warnings are highlighted at the top of the results for instant visibility.
No. The File Risk Score Calculator is a heuristic analysis tool that identifies suspicious patterns and risk indicators, but it cannot detect all types of malware or zero-day exploits. It should be used as part of a layered security approach alongside dedicated antivirus software, firewalls, and safe computing practices. A low risk score does not guarantee a file is safe - always exercise caution with unknown files.