Blur & Unblur AI - Free face blur tool that runs 100% locally in your browser

What Is Blur & Unblur AI?

Hey, have you ever snapped a great photo at a party or a community event, gone to post it on social media, and then stopped yourself because there were other people's faces in it? You're not alone. Sharing photos publicly when other people are in them can feel like walking a tightrope between capturing a fun moment and respecting someone's privacy.

That's exactly where Blur & Unblur AI comes in. It's a free, online AI-powered face blurring tool that lives entirely in your browser. No downloads, no sign-ups, no accounts. You just open the website, upload your photo, and let the AI automatically detect every face in the image. From there, you can blur them with one click and download a clean PNG ready for sharing.

The magic trick? Everything happens locally on your device. The face detection, the mask editing, the blur preview, the export — none of it ever touches a server. The official documentation explicitly states that "no upload endpoint is used." Your photo never leaves your computer.

It's a single-page app hosted on GitHub Pages, likely built by an independent developer or a small team. Simple, transparent, and refreshingly private.

Core Features of Blur & Unblur AI

So what can you actually do with this thing? Let's walk through the features the way you'd actually use them — not a dry list of functions.

Auto Face Detection That Actually Works

Upload a group photo, and within a second or two, the tool draws a mask over every face it finds. It uses your browser's built-in Face Detection API — no cloud AI, no external services. For most well-lit, front-facing photos, it nails the detection on the first try. Each detected face gets its own editable mask, so you can tweak things individually later.

Lasso Mode: For When AI Misses a Face

Sometimes the AI misses a face — especially if it's a profile shot, a small face in the background, or someone in low lighting. That's where the Lasso (Manual Mask) tool shines. You simply draw a freehand shape around the missed face, and the tool treats that area just like an auto-detected face. It's your safety net.

Select Mode: Clean Up False Positives

The AI might also flag something that isn't a face — a round logo, a pattern on a shirt, whatever. Instead of being stuck with it, you switch to Select mode, click to remove the false detection, or toggle the blur on and off for each individual mask. Perfect for those situations where you want only some faces blurred and not others.

Live Blur Strength Slider

You get a real-time slider to control how strong the blur is. Crank it all the way up and faces become completely unidentifiable. Dial it back for a softer, gentler blur that still preserves the overall composition. The Canvas preview updates instantly — no waiting.

Three Blur Modes: Face Blur, Face Unblur, and Full Blur

• Face Blur is the main event — blurs only the selected faces.
• Full Blur blurs the entire image, useful if you want a completely anonymized photo.
• Face Unblur is the undo button: if you've blurred something and change your mind, this restores the original.

Clean PNG Export

When you export, the resulting PNG is stripped of all UI elements — no guide boxes, no dashed lines, no handles. Just your blurred image, clean and shareable.

Who's Using Blur & Unblur AI?

This tool isn't for some niche technical audience — it's for anyone who shares photos and cares about other people's privacy. Here's who gets the most out of it.

Social Media Users

Imagine you're at a friend's birthday dinner. You take a candid shot of the whole table, and everyone's laughing. You want to post it, but not everyone at the table is comfortable with their face being public. With Blur & Unblur AI, you upload the photo, the AI finds all the faces, you blur the ones who prefer to stay anonymous, and download a share-ready version. The background and the vibe of the photo stay completely intact.

Event Organizers, Schools, and Community Groups

If you run a local sports league, a school PTA, or a neighborhood meetup, you've probably had that moment where you're sitting on a dozen great photos from an event but can't post them because minors are in the shots. This tool lets you batch-process those photos, blur all faces automatically, and publish with confidence. It's a fast, no-fuss way to stay compliant with privacy requirements.

People Who Need Selective Blurring

Group photos are tricky. Some people are fine with their face being public; others aren't. Using Select mode, you can individually toggle the blur on each detected face. The person who wants to be visible stays clear; the person who wants privacy gets blurred. Simple.

Privacy-Conscious Users

You might just not trust uploading personal photos to some random cloud tool. And honestly, that's smart. Because Blur & Unblur AI processes everything locally, your photos never make a trip to a remote server. If you handle sensitive images — headshots, IDs, private events — this is a huge peace-of-mind feature.

Marketers and Content Creators

Let's say you want to publish a customer testimonial that includes a screenshot with someone's face visible. Or you're sharing a case study image from a client event. You can quickly blur any identifying faces while keeping your product or interface front and center.

Getting Started

The whole point of this tool is that you shouldn't have to read a manual to use it. But here's a quick walkthrough anyway — it'll take you about 30 seconds.

Step 1: Open the website

Go to https://blur-unblur.github.io in your browser. That's it. No sign-up, no download, no email required.

Step 2: Upload your photo

Click the upload area and select your image. The tool supports JPG, PNG, and WebP formats.

Step 3: AI detects faces automatically

Within a second or two, every face in the photo gets an editable mask overlaid on it. The AI uses your browser's built-in Face Detection API, so it's fast and doesn't need an internet connection beyond the initial page load.

Step 4: Tweak if you need to

• Drag the blur strength slider to adjust how strong the blur is.
• Use Select mode to remove false detections or toggle individual faces on and off.
• Use Lasso mode to manually mark any faces the AI missed.

Step 5: Export and share

Hit the export button, and you get a clean PNG — no UI elements, no guide boxes — just your blurred photo, ready to share.

System Requirements

The tool works best on the latest versions of Chrome, Edge, Safari, and Firefox. JavaScript and Canvas need to be enabled (they usually are by default). If you're working with very high-resolution photos (like raw camera files), and the browser starts feeling sluggish, try resizing the image first — large files can strain device memory.

Frequently Asked Questions