Mozaru — Free Mosaic & Blur for Photos and Images
Apply mosaic, blur, or black-out to just the areas you choose. Select regions with the rectangle, ellipse, or pen tool and edit with a real-time preview. No upload, completely free. Saves at top JPEG quality. HEIC supported.
Drop an image file
or click to select
JPEG, PNG, WebP, GIF, BMP, HEIC/HEIF supported
Tools
Canvas
Drag for rectangle/ellipse, or trace freely with the pen to select, then "Apply" the effect. Fine-tune the shape with the handles.
How to Add Mosaic & Blur (Guide)
Adding mosaic or blur takes just 4 easy steps: pick an image, enclose the area to hide, choose the type and strength, and hit "Apply".
Select an image file
Drag & drop or click to select the image you want to edit. JPEG, PNG, WebP, and HEIC/HEIF are supported.
Enclose the area with a selection tool
Drag for the rectangle/ellipse tools, or trace freely with the pen. After placing a rectangle or ellipse, fine-tune its size and position with the handles.
Choose the effect type and strength
Pick from pixelate, blur, black-out, or white-out, and adjust with the strength slider.
Apply and download
The "Apply" button applies the effect to the selection. Add as many as you like, then download at top JPEG quality when done.
How to Mosaic or Blur Faces and License Plates
When posting photos to social media or a blog, hiding faces with mosaic or blur is one of Mozaru’s strengths. Just enclose the face area with the rectangle, ellipse, or pen tool and apply pixelate, Gaussian blur, or black-out. You can hide multiple faces by adding one region at a time.
Beyond faces, you can pinpoint and mosaic or blur car license plates, personal information such as addresses and names, and people or signs caught in the background. Images are processed entirely in your browser without being sent to a server, so photos containing faces or personal data stay safe.
It works right in your smartphone browser (iPhone and Android) with no app to install — hide faces and add mosaic on the spot, right after shooting.
FAQ
Is it really free?
Yes, it is completely free to use. No sign-up required.
Are my images uploaded to a server?
No. Images are never sent to a server. All processing happens in your browser, so your privacy is protected.
What selection tools are there?
Three: rectangle, ellipse, and pen (freehand). After placing a rectangle or ellipse, you can fine-tune size and position with the handles. You can also apply multiple times to overlap regions.
What effect types are available?
Four: pixelate (mosaic), Gaussian blur, black-out, and white-out. Strength (block size or blur amount) is adjustable with the slider.
Can I use photos taken on iPhone (HEIC)?
Yes, HEIC/HEIF images are supported and converted automatically.
Does it work on smartphones?
Yes, it works in iPhone and Android browsers. You can select regions by touch.
What is the saved image quality?
Saved at top JPEG quality (quality 100), minimizing degradation outside the edited areas.
Can I add mosaic with just a browser? No install needed?
Yes. Mozaru runs in your browser, so no app install or software download is required. Just open the site, pick an image, and add mosaic or blur right away.
Which image formats are supported? (JPEG, PNG, WebP)
JPEG, PNG, WebP, GIF, BMP, and HEIC/HEIF are supported. HEIC photos from iPhone are auto-converted. Output is top-quality JPEG.
Can I use it to hide faces, license plates, or personal info?
Yes. Hide faces before posting to social media, car license plates, personal info such as addresses and names on documents, background details, and more — select just the area with the rectangle, ellipse, or pen and apply mosaic, blur, or black-out.
How is it different from other image mosaic sites?
Mozaru stands out by (1) processing images only in your browser without uploading, (2) requiring no sign-up, (3) being completely free, and (4) offering intuitive editing with three tools (rectangle, ellipse, pen) and a real-time preview.
Can I add mosaic to videos?
Mozaru is for images only. To add mosaic to video, please use our sister tool “Tsuibi Mozaru”. Enclose the area you want to hide in the video and it automatically tracks and applies mosaic or blur.
Key points for using image mosaic free, sign-up-free, and entirely in your browser
In-browser processing protects your privacy
Images are never sent to a server. Everything is processed in your browser, so you can mosaic or blur even photos containing faces or personal information without worrying about third parties.
Supports JPEG, PNG, WebP, and HEIC
In addition to JPEG, PNG, WebP, GIF, and BMP, iPhone HEIC/HEIF photos are supported and auto-converted on load. Output is top-quality JPEG (quality 100), minimizing degradation outside the mosaic.
Use cases (hiding faces, license plates, personal info)
Hide faces before posting to social media, car license plates, personal info such as addresses and names on documents, background details, and more — select just the area with the rectangle, ellipse, or pen to hide it precisely.
Effect types and when to use them (pixelate, blur, black-out, white-out)
Use blur to keep some atmosphere, black-out to hide for certain, and pixelate (mosaic) for general masking. Adjust block size or blur amount with the strength slider.
How it differs from other image mosaic sites
Many mosaic services are upload-based and require an account. Mozaru is local-processing, sign-up-free, and completely free, with three selection tools and a real-time preview for intuitive use on both PC and mobile.
Mosaic editing and pixelation entirely in your browser
Adding a mosaic to a photo used to mean installing editing software or handing your image to an upload-based service. Mozaru is a browser-based mosaic tool that finishes the whole job locally, with no installation and no account. Select the area you want to hide, set the strength, and the mosaic is done in seconds.
Blur photos and images, not just pixelate them
Blurring works exactly like the mosaic. A photo blur suits cases where you want to hide a face naturally, or soften something that was caught in the background. Because a blur keeps more of the outline than a mosaic, the mood of the picture stays intact. Blur strength is adjustable with a slider, and you can redo it as many times as you like.