How MiniPx keeps your files private
Most image compression tools work by uploading your file to a server, processing it remotely, and sending back the result. During that round trip, your original photo exists on infrastructure you do not control — often for minutes, sometimes longer.
MiniPx takes a fundamentally different approach. All image processing runs in JavaScript directly inside your browser tab using the Canvas API and Web Workers. When you compress a photo, resize an image, or convert between formats, the work happens on your CPU — not on a remote server. Your files never enter a network request.
This architecture is not a premium feature or an optional mode. It is the only way MiniPx works. There is no server-side fallback, no cloud processing for larger files, no optional upload path. Every operation, from a 100KB icon to a 25MB camera RAW photo, runs locally.
What this means for you
Personal photos stay personal. Compress holiday snaps, family photos, or selfies without a copy existing on someone else's infrastructure.
Sensitive documents stay secure. Passport scans, ID photos, medical images, tax documents, contracts — process them knowing nothing leaves your device.
Business files stay confidential. Product photos before launch, internal presentations, unreleased marketing assets — compress without leaking to third parties.
EXIF metadata gets stripped. Every compression removes GPS coordinates, device info, and timestamps that are invisibly embedded in your photos. Your output files contain no hidden personal data.
GDPR and UK data protection
MiniPx is compliant with GDPR and the UK Data Protection Act by design — not by policy. Since no personal data or image files are transmitted to or stored on any server, there is no data processing to regulate. We collect anonymous page-view analytics via Google Analytics to understand which tools people use most. No cookies are set for tracking purposes. No personally identifiable information is collected, stored, or shared.
Sector-specific use cases
NHS and healthcare. Patient images, clinical photographs, referral documents, and scan results fall under strict NHS Digital data governance standards. Uploading these to third-party compression tools creates a data processing relationship that requires a DPIA (Data Protection Impact Assessment). MiniPx avoids this entirely — files never leave the clinician's device, so there is no data processor relationship to assess.
Education. Schools and universities handle student photos, exam scripts, safeguarding records, and SEND documentation. Under the Children's Code (Age Appropriate Design Code), processing children's data requires higher standards. MiniPx is safe for compressing student images because no data is transmitted — schools can use it without adding another vendor to their data processing register.
Legal and professional services. Solicitors, barristers, and accountants handle client-privileged documents. Uploading contract scans or court filing images to external servers risks breaching legal professional privilege. MiniPx processes everything locally, preserving privilege because no third party ever accesses the content.
Government and public sector. UK government departments follow the Government Security Classifications policy. OFFICIAL-SENSITIVE documents should not be processed on external services without assessment. MiniPx requires no such assessment because files remain on the user's device throughout processing.
Verify it yourself
You do not need to take our word for it. Open your browser's developer tools (F12 on desktop, or use your browser's inspection mode), switch to the Network tab, then compress an image. You will see the page load resources (HTML, CSS, JavaScript) but zero outgoing requests containing image data. Or simply disconnect from the internet after the page loads — everything still works.
MiniPx is also open-source. The compression logic uses the browser's native Canvas API for JPEG/PNG/WebP encoding and jsPDF for PDF creation. No proprietary server-side processing, no hidden API calls, no third-party image services.
Comparison with other tools
| Feature | MiniPx | TinyPNG | iLoveIMG |
|---|---|---|---|
| Processing location | Your browser | Their server | Their server |
| Files uploaded | Never | Always | Always |
| Works offline | Yes | No | No |
| EXIF stripping | Automatic | Partial | Optional |
| GDPR-safe by design | Yes | Policy-based | Policy-based |