How to Blur Faces in Photos Online โ AI Auto-Detection, No Upload (2026)
Manually drawing blur regions over every face in a batch of photos is tedious and error-prone. This guide covers how to automatically detect and anonymize faces in up to 100 photos at once โ using an AI model that runs entirely in your browser, with no upload, no account, and three blur styles to choose from.
Published August 2026 ยท SimpleTool Team
When you need face blurring
Event and street photography
Publishing event photos online requires consent from identifiable individuals. Blur faces of people who did not consent before sharing publicly.
GDPR and privacy compliance
Publishing images of identifiable people in the EU requires a legal basis. Anonymizing faces before publication is the simplest path to compliance.
Security camera screenshots
CCTV footage used in insurance claims, reports, or social media must have bystander faces redacted. Process screenshots in bulk before sharing.
Research and journalism
Protecting subject identity in published research photos or news images where sources have requested anonymity.
Three anonymization styles
Gaussian Blur
A smooth, diffused blur that obscures features while looking natural. Common in news photography and documentary video. Adjustable blur radius โ higher values are stronger and harder to reverse.
Pixelate
Replaces the face region with large mosaic squares โ the classic censor effect. Familiar and immediately readable as intentional anonymization. Adjust the pixel block size for coarser or finer pixelation.
Black Box
A solid filled rectangle covers the face. The most visually unambiguous method and the standard for legal documents, official reports, and some GDPR contexts. Padding control adjusts how much of the face region is covered.
Step-by-step guide
Open the Blur Faces tool
Go to simpletool.co/blur-faces. The MediaPipe BlazeFace model (224 KB) loads in your browser on first visit โ it is small and loads in seconds.
Drop up to 100 photos
Drag and drop JPG, PNG, or WebP photos โ up to 100 per batch. Processing starts automatically when files are added.
Choose your anonymization style
Select Gaussian Blur (smooth, natural), Pixelate (mosaic squares), or Black Box (solid rectangle). Adjust the effect intensity โ blur radius, pixel size, or box padding โ to suit your use case.
Adjust detection sensitivity if needed
The default sensitivity is tuned for typical photos. Lower it if faces are being missed; raise it if non-face regions are getting flagged. Re-processing after adjusting takes only seconds.
Download anonymized photos
Download each photo individually as it finishes, or wait for the full batch and download a ZIP. Output files are the same format as the input.
Ready to anonymize your photos?
Open Blur Faces Tool โAbout the face detection model
The tool uses MediaPipe BlazeFace, a lightweight neural network from Google designed for real-time face detection. The model is only 224 KB โ tiny compared to general-purpose vision models โ which means it loads in seconds and runs fast even on mid-range hardware. It detects face bounding boxes with 6 facial keypoints (eyes, ears, nose, mouth corners) and runs entirely as a WebAssembly module in your browser.
BlazeFace was designed for mobile-first, on-device use โ which makes it a natural fit for browser processing. The first image in a batch is slightly slower while the model initializes; subsequent images in the same session are faster.
Frequently asked questions
Does it detect faces automatically, or do I have to mark them manually?
Detection is fully automatic. The Google MediaPipe BlazeFace model finds faces and draws bounding boxes around them. You set the detection sensitivity โ lower sensitivity catches more faces at the risk of false positives; higher sensitivity is stricter and may miss small or partially-obscured faces. You do not need to draw any boxes or mark faces manually.
What is the difference between the blur, pixelate, and black box styles?
Gaussian Blur applies a smooth, diffused blur โ faces are unrecognizable but the effect looks natural and is common in journalism and documentary photography. Pixelate (mosaic) replaces the face region with large colored squares โ the classic censor effect familiar from TV. Black Box draws a solid black (or custom-color) rectangle over the face โ the most visually obvious and legally unambiguous anonymization method, often required for GDPR-compliant publication. All three achieve the same privacy goal; the choice is aesthetic.
Can it blur license plates or other sensitive information?
No โ the tool detects faces only. License plates, names, addresses, ID numbers, and other sensitive text require a different approach. For documents and PDFs with sensitive text, use the Redact PDF tool at simpletool.co/redact-pdf. For general-purpose region redaction on images, you can manually crop, draw over, or blur regions in any image editor.
What if it misses a face or incorrectly blurs something?
Adjust the sensitivity slider and re-process. Lowering sensitivity increases recall โ it catches more faces but may also flag non-faces. Small faces (far from the camera), faces at steep angles, or faces that are heavily occluded are harder for the model to detect. If a specific face is persistently missed, you can manually blur it in any image editor after downloading the auto-processed version.
Can I use it on photos containing headshots in documents or presentations?
Yes. The model detects faces in any image context โ employee directories, presentation slides, event photos, screenshots with profile pictures. Drop the image directly and all detected faces are processed. For very small headshots (under 40ร40 pixels in the image), detection may be less reliable.
How many photos can I process at once?
Up to 100 photos per batch. Drop all files at once and they are processed sequentially. Each image result is available for individual download as it completes. When the batch finishes, download all anonymized photos as a ZIP.
What is the emoji face replacement mode?
Emoji mode replaces detected face regions with an emoji overlay instead of a blur or block. This is useful for social media posts where you want to anonymize people in a visually distinctive or humorous way rather than a formal censor effect. Access it at simpletool.co/blur-faces?mode=emoji.
Does the photo get uploaded to a server?
No. The MediaPipe BlazeFace model (224 KB) loads as a WebAssembly module in your browser tab. All face detection and image processing happens locally. Your photos stay in device RAM and are never transmitted anywhere.
Blur faces in your photos now
AI auto-detects faces. Batch up to 100 photos. No upload, no account.
Open Blur Faces Tool โ