File Upload Security
A new tool extracted from the codebase.
Last reviewed by the Radiatus Cloud team
Need this handled by experts?
Radiatus runs VAPT, managed SOC & security engineering for regulated teams.
Check how safely uploads are handled
File upload features are a frequent source of serious vulnerabilities, because they let an outsider put a file on your server. This tool helps you review the security of file upload handling, so you can identify the checks your own uploads should perform.
Why uploads are dangerous
An upload is untrusted input in the most literal sense: a file chosen entirely by the user, landing on your infrastructure. Without proper handling it can lead to serious compromise, an executable disguised as an image and then run, a filename crafted to escape the intended directory, a file large enough to exhaust storage, or content that attacks whoever later opens it. The defences, validating type by content not extension, storing outside the web root, generating safe filenames, limiting size, are well known but easy to omit. Reviewing them is defensive work on your own application.
Secure your own uploads
The tool runs entirely in your browser, so nothing you paste is uploaded, which is exactly what you want when the input is your own security-sensitive data.
Related tools
- Password Strength Checker — Measure password strength by entropy and pattern analysis rather than character-class rules. Checked entirely in your browser.
- Password Generator — Generate strong random passwords and passphrases in your browser using the Web Crypto API. Nothing is transmitted, logged or stored.
- Hash Generator — Generate MD5, SHA-1, SHA-256 and SHA-512 hashes in your browser. Compare checksums and verify file integrity with nothing uploaded to a server.
- Base64 Encoder/Decoder — Encode and decode Base64 in your browser, including URL-safe Base64 and UTF-8 text. Handles files and data URIs locally with nothing uploaded.
Frequently Asked Questions
Why are file uploads risky?
Because they let an untrusted user place a file on your server. Mishandled, this can lead to executing malicious files, escaping directories, or exhausting storage.
How should uploads be validated?
By checking the file type from its actual content rather than its extension, since an extension is trivially faked to disguise an executable as an image.
Where should uploaded files be stored?
Outside the web root where they cannot be executed as code, with generated safe filenames rather than user-supplied ones, and size limits enforced.
Is this for my own application?
Yes. It is defensive review to confirm your upload handling performs the checks that keep untrusted files from causing harm.
Is my input uploaded?
No. The tool runs entirely in your browser.
Privacy & Security
Processed locally.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
Related Tools
Password Strength Checker
SecurityMeasure password strength by entropy and pattern analysis rather than character-class rules. Checked entirely in your browser.
Password Generator
SecurityGenerate strong random passwords and passphrases in your browser using the Web Crypto API. Nothing is transmitted, logged or stored.
Hash Generator
SecurityGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes in your browser. Compare checksums and verify file integrity with nothing uploaded to a server.