Blur Faces & License Plates in Video — Free Auto-Tracking Mosaic, No Upload
Draw a box over what you want to hide and it auto-tracks and blurs or pixelates it as it moves. Faces, license plates, logos, text. Everything runs inside your browser — no upload, no sign-up, no watermark. Keeps the original frame rate and audio. MP4 / MOV supported.
Drop a video file
or click to select
MP4, MOV, WebM supported
Preview
Mosaic settings
Export complete
Update Info
Fixed an issue where exported videos could lose their sound on iPhone (iOS 26). The result screen now also shows whether audio was included.
Each region can now have its own mosaic settings (hide style, strength, color, etc.). Tap a box to select and style it.
Export on smartphones is now faster (60fps videos are processed at 30fps; 24/30fps videos are unchanged).
Each region can now be switched between "tracking" and "fixed". Apply a fixed (non-tracking) mosaic to captions and other spots that do not move (toggle via the round button at the top-left of the box).
You can now unload the video and return to the start screen with the "✕" at the top right of the preview.
Made preview playback lighter on smartphones (less redundant processing, less heat and battery drain).
If you find a bug or issue, please contact us here.
About Tsuibi Mozaru
Tsuibi Mozaru is a free site that mosaics or blurs the parts you want to hide in a video while automatically tracking them. Video files are never uploaded to a server — everything from processing to export happens in your browser. Faces, license plates, logos, nameplates, text and more can be hidden easily, with no sign-up and completely free, for social posts, video streaming or business footage. The region you enclose tracks the motion automatically, or can be set to fixed (non-tracking) per region. The hide style and strength can also be set per region. If it drifts you can re-place it to correct, and trimming the export range is supported too.
🎯 Enclose & auto-track
Just drag to enclose what you want to hide. Moving targets are tracked frame to frame so the mosaic follows. A fixed (non-tracking) mode is also available for spots that do not move.
🟦 Four ways to hide
Choose from mosaic, blur, fill, or stamp (emoji / image). Tap a box to select it and give each region its own style and strength.
🚗 Hide anything
Faces, license plates, logos, nameplates, text — anything you can enclose can be masked.
✂️ Trimming
Use the handles at both ends of the timeline to export only the part you need.
🔒 No upload
Your video never leaves your device. Everything is processed in-browser, so privacy is safe.
🎞️ Keeps quality & fps
Exports while keeping the source frame rate. Audio is preserved as well.
How to Add Video Mosaic (Guide)
Adding video mosaic or blur takes just 4 easy steps: pick a video, enclose what to hide for auto-tracking, fine-tune the look, and export.
Select a video file
Drag & drop or click to select the video you want to edit. The file never leaves your device.
Enclose what to hide
Press "Add region" and drag on the preview to enclose what you want to hide (face, plate, logo, etc.). The enclosed region auto-tracks during playback. If it drifts, re-place the box at that point to correct it. For a spot that doesn't move, tap the round button at the box's top-left to switch it to "fixed" — the mosaic stays in place without tracking.
Adjust look & range (optional)
Adjust the hide style (mosaic / blur / fill / stamp), strength, coverage area, and shape. Tap a box to select it and adjust just that region. You can also set the export range (trimming) with the handles at both ends of the timeline.
Export and download
Press "Apply mosaic & export" to create a video with every frame in range processed. The original frame rate is kept and audio is preserved.
How to Mosaic or Blur Faces in a Video
When posting a video to social media or streaming, mosaicking or blurring faces in the video is what Tsuibi Mozaru does best. Just press "Add region" and drag to enclose the face — even as the face moves, the mosaic or blur auto-tracks and follows. You can hide multiple faces by adding more regions.
Beyond faces, you can pinpoint and hide car license plates, logos, nameplates, signs, document text and more — anything you can enclose. The video is processed only on your device without being sent to a server, so you can safely hide faces even in footage where third parties appear.
No app installation needed. Open it in your smartphone (iPhone / Android) or PC browser and mosaic or blur video faces right away.
Privacy
FAQ
Is it really free?
Yes, completely free with no sign-up required.
Is my video uploaded?
No. Tracking, mosaic processing and export all happen in your browser, so the file is never sent to a server.
How do I add mosaic?
Press "Add region" and drag on the preview to enclose what you want to hide. The enclosed region auto-tracks the motion during playback. You can add multiple regions.
Can I apply a fixed (non-tracking) mosaic?
Yes. Each region can be switched between tracking and fixed. Tap the round button at the top-left of the box to set it to fixed, and the mosaic stays in the same place without tracking - handy for captions and subjects that do not move.
Can each region use a different hide style?
Yes. Tap a box to select it and set that region's own hide style (mosaic / blur / fill / stamp), strength and color. "Apply to all regions" makes every region match at once.
The tracking sometimes drifts
It can drift in fast motion or scenes with similar patterns. In that case, seek to the drifted point and re-place the box to correct from that moment (a correction point is added on the timeline).
Can I hide things other than faces (plates, logos, text)?
Yes. Anything you can enclose can be hidden. You can mosaic or blur faces, license plates, logos, nameplates, parts showing personal information, and more.
What is the output format?
It exports as MP4 or WebM depending on your browser. The audio track is carried over from the original video.
Does it work on phones (iPhone / Android)?
Yes, it works in recent smartphone browsers, including videos shot on iPhone (HEVC). For long or high-resolution (e.g. 4K) videos, a PC exports more reliably.
Can I export only part of the video (trimming)?
Yes. Drag the handles at both ends of the timeline to set the export range. Only that range is exported, keeping the original frame rate and audio.
Will the exported frame rate drop?
No. It keeps the source frame rate (up to 60fps). On supported browsers it processes one frame at a time for accuracy, so smoothness is preserved.
Is it OK for social posts or work videos?
Yes. All processing happens on your device and the video is never sent out. For certain hiding, we recommend "Mosaic" or "Fill" (stamp emoji can be see-through at the corners).
Do I need to install an app for video mosaic?
No. Tsuibi Mozaru is a video mosaic site that runs in your browser, so no app install or software download is needed. Just open the site, pick a video, and add mosaic or blur on the spot.
Can I use it for YouTube or TikTok videos?
Yes. Before posting, you can mosaic or blur faces, license plates and personal info caught in the video with enclose-only auto-tracking, then upload the exported video as is.
Key points for using video mosaic free, sign-up-free, and entirely in your browser
No app install — works in the browser alone
Tsuibi Mozaru is a video mosaic site that runs in your browser. Unlike video mosaic apps or software, no install or sign-up is required. Open the site, pick a video, enclose what to hide, and apply mosaic or blur on the spot. Works on both PC and mobile (iPhone / Android).
Hide faces & plates before YouTube / TikTok / social posts
Before posting to YouTube, TikTok, Instagram and the like, hide passersby faces, children’s faces, car license plates, addresses and nameplates caught on camera. The enclosed region auto-tracks, so there is no need to paint moving targets frame by frame.
Mosaic vs. blur — which to use
Use a coarse mosaic or fill when you need certain hiding, and video blur when you want to keep the atmosphere. Adjust strength, coverage area and shape (ellipse / rectangle) for natural masking suited to the target.
Supported formats and frame-rate preservation
Supports MP4, MOV, WebM and other browser-playable video, including iPhone HEVC. On supported browsers it processes one frame at a time to keep the source frame rate (up to 60fps) and audio. Trimming the export range is also possible.
How it differs from other video mosaic sites and apps
Many video mosaic services are upload-based, require an account, or are paid. Tsuibi Mozaru is local-processing, sign-up-free and completely free, combining enclose-only auto-tracking with privacy protection.