A Fixed Area
Select a static screen corner, document field, sign, address, or label and cover only that region.
Quick Answer
How Do You Blur Just One Part of a Video?
To blur a part of a video, select the region you want to hide, choose a blur style, and keep the selection aligned if the target moves. UniConverter AI Video Blur handles that movement with two options: AI Face Blur mode detects faces and lets you choose one, several, or all detected faces, while Object Tracking Blur mode lets you draw a tracking area around a license plate, logo, screen, document, product, or another non-face target. The selected face or object stays covered as it moves, while the rest of the frame remains clear.
This method keeps the rest of the picture clear and works for faces, license plates, usernames, documents, signs, screens, logos, labels, and other specific details.
“Part of a video” can mean two things: a region inside the frame or a short section on the timeline. AI Video Blur handles the selected visual region. If the blur should appear only during one passage, isolate that passage with UniConverter’s trimming or editing workflow and apply the blur to the relevant clip.
Choose the Exact Area
Blur Specific Parts of a Video—Not the Whole Frame
The right method depends on whether the detail stays still, moves across the screen, appears more than once, or sits outside the subject you want to keep clear.
A Moving Object
Box a license plate, badge, phone, logo, or another target and let AI keep the blur aligned.
One or More Faces
Let AI detect people, then choose a specific person, several people, or every detected face.
The Area Outside a Subject
Reverse the selection to preserve the subject and blur a video background.
Automatic Face TrackingDetect faces, choose who to hide, and keep the effect aligned through movement
Moving Object TrackingSelect a plate, screen, logo, or other target and follow it across the clip
10 Blur StylesParticle, Smear, Pastel, Sketch, Horizontal, Blur, Cross, Ink, Mosaic, and Paint
Local WorkflowProcess unblurred source footage in the desktop app
Common Targets
Blur Something in a Video Without Hiding Everything Else
Choose the detail that creates a privacy, compliance, or presentation problem, then apply the right tracking and blur settings without hiding the useful parts of the shot.
Faces & People
Detect people automatically and blur faces in video selectively or all at once.
License Plates
Draw a tracking area around a plate and keep the blur aligned with the moving vehicle.
Screens & Accounts
Hide emails, usernames, dashboards, order data, API keys, and internal product details.
Text & Documents
Blur names, addresses, forms, whiteboards, contracts, shipping labels, or ID badges.
Logos & Labels
Conceal an outdated brand mark, product label, platform graphic, or other unwanted detail.
Private Backgrounds
Reverse the selected area to hide surroundings while preserving the main person or product.
Why AI Tracking
Keep the Blur on the Part You Selected
A fixed blur works only when the target stays still. UniConverter’s blur video editor follows the selected face or object when its size, angle, or position changes across the clip.
Select Once Instead of Moving a Mask Frame by Frame
Let AI detect faces automatically, or draw one tracking area around another target. UniConverter analyzes the selected face or object and updates the blur position through the footage.
- Useful when a person walks, turns, enters, or leaves the frame.
- Keep coverage on cars, plates, phones, screens, signs, and handheld objects.
- Preview the result to check that no sensitive detail slips outside the blurred area.
Choose the Blur Style and Fine-Tune the Coverage
Choose Particle, Smear, Pastel, Sketch, Horizontal, Blur, Cross, Ink, Mosaic, or Paint in Blur Settings. Then refine how the selected effect covers and blends around the target.
- Adjust Strength to control how strongly the selected part is concealed.
- Change Feather for softer or tighter edges around the target.
- Set Opacity, use Reverse when needed, and preview before export.
Review Sensitive Footage Before It Leaves Your Desktop
Unblurred footage can contain faces, addresses, screens, customer data, or confidential documents. UniConverter processes the source video in its desktop workflow and lets you preview the tracking and coverage before export.
- Avoid repeatedly uploading unredacted source clips to unfamiliar browser tools.
- Recheck fast motion, overlapping subjects, edges, and partial obstructions.
- Continue trimming, converting, compressing, editing, or enhancing in the same app.
How to Blur a Part of a Video in 3 Steps
Import the clip, select the face or object that needs hiding, customize the effect, and confirm that the blur stays aligned before export.
Step 1. Add the video
Open AI Video Blur and import the footage containing the area, person, or object you need to hide.
Step 2. Select the part to blur
Choose AI Face Blur and select one, multiple, or all detected faces. For a plate, screen, text, logo, label, or another object, choose Object Tracking Blur, click Add Tracking Area, and draw around the target.
Step 3. Style, preview, and export
Choose a Blur Style, adjust Strength, Feather, and Opacity, use Reverse when needed, and preview the tracking before export.
Real-World Use Cases
Where a Localized Blur Solves the Problem
Blur out a part of video when one recognizable detail prevents otherwise useful footage from being published, shared, taught, reviewed, or reused.
Vlogs & Social Clips
Blur a bystander, child, username, address, or passing plate without softening the creator or the rest of the scene.
Choose the Right Method
AI Video Blur vs. Fixed Blur Layers & Manual Masking
All three methods can conceal a video part, but they differ once the target moves, the footage is sensitive, or the blur needs visual refinement.
| Capability | UniConverter AI Video Blur | Fixed Blur Layer / Crop | Traditional Mask & Keyframes |
|---|---|---|---|
| Select only one part of the frame | ✓ Detected face or custom tracking area | ✓ Static area | ✓ Custom mask |
| Follow a moving face | ✓ Automatic detection and tracking | Manual repositioning required | Tracking or keyframe setup required |
| Follow a selected non-face object | ✓ User-defined tracking area | Manual repositioning required | Tracking or keyframe setup required |
| Blur several detected faces | ✓ Select specific or all faces | Separate layers or masks | Separate masks and tracking work |
| Blur Style choices | 10 styles, including Blur, Mosaic, Smear, and Paint | Depends on editor | Flexible but setup varies |
| Fine-tune the edge and coverage | Strength, feather, opacity | Basic controls vary | Detailed manual controls |
| Handle unblurred sensitive source footage | Local desktop workflow | Depends on the tool | Local in desktop editors |
| Skill and setup required | Low | Low for a static region | Medium to high |
Fixed-layer and traditional-editor capabilities vary by product. The comparison describes common workflows rather than every available editor.
Practical choice: A fixed layer is enough for an unmoving corner. Use UniConverter when a face, plate, screen, logo, or other selected detail changes position and you want the blur to follow without building a mask path frame by frame. Use a full timeline editor when the project requires complex compositing beyond privacy blur.
Product Facts
Supported Formats and Desktop Workflow
Import a common video file, blur the specific region that needs protection, review the coverage, and continue with the rest of the post-production process.
Common Video Formats
AI Video Blur supports MP4, MOV, AVI, MKV, M4V, WMV, FLV, MTS, TS, 3GP, and other commonly used formats supported by UniConverter.
MP4MOVAVIMKVM4VWMVFLVMTSTS3GP
From Raw Footage to Share-Ready Video
Keep the blur task inside a broader desktop workflow. Trim or edit the relevant clip, select the private area, preview tracking, then convert, compress, enhance, or export as needed.
Import→Trim / Edit→Select Part→Track & Blur→Preview→Export
Batch workflow: Multi-video AI Video Blur is planned for UniConverter V18, allowing users to add several clips, review the settings for each file, and process them within one queue.
Blur Part of Video FAQ
Frequently Asked Questions
Direct answers about selected areas, moving targets, multiple faces, timeline sections, local processing, and blur controls.
Open AI Video Blur and import the clip. Select a detected face, or add a tracking area around another target. Choose the blur style, preview the movement and coverage, and export. Only the selected part is blurred while the rest of the frame remains clear.
Yes. Select the moving face or draw a tracking area around another target. AI keeps the blur aligned as the selected face or object changes position, without frame-by-frame keyframing.
You can blur faces, license plates, screens, usernames, emails, addresses, documents, signs, logos, labels, ID badges, whiteboards, and other visible details. Non-face targets must be selected before AI tracks them.
UniConverter can detect multiple faces so you can choose one, several, or all of them. For non-face details, add the required tracking areas and preview every blurred region before export.
If the sensitive detail appears only during one passage, isolate that interval with UniConverter’s trimming or editing workflow, apply AI Video Blur to the relevant clip, and then continue the edit. This separates a time-based section from a visual area inside the frame.
Faces are detected automatically. A non-face object is not chosen automatically: click Add Tracking Area and draw around a license plate, screen, logo, document, or another target, then AI follows that selected object through the footage.
Yes. Choose Mosaic for pixelated coverage, or select Particle, Smear, Pastel, Sketch, Horizontal, Blur, Cross, Ink, or Paint. Adjust Strength, Feather, and Opacity to control how strongly the selected portion is concealed.
Yes. Use Reverse to invert the selected area. The chosen subject stays clear while the surrounding background is blurred.
No. UniConverter AI Video Blur works in the Windows and macOS desktop application, so the source footage can be processed locally instead of being repeatedly uploaded to an unfamiliar online blur site.
Yes. Preview the result to check the selected region, motion tracking, edge coverage, and blur strength. Adjust the target or effect settings before exporting the final video.
Blur Only the Part That Needs Hiding
Hide the exact face, object, or private detail that should not be shared, keep the blur aligned through movement, and preview the coverage before export.
