Feathered blur โ hides subtitles without changing speed or audio
MP4, MOV, AVI, MKV supported
When a video has hardcoded subtitles burned into the frame, the only way to make them unreadable is to blur that region. Our Subtitle Blur tool uses a feathered Gaussian blur that fades at the edges, giving a natural, seamless result rather than a harsh rectangular overlay.
The blur fades gradually at the top and bottom edges, so it blends naturally with the surrounding video rather than appearing as a hard rectangular block.
The blue blur box overlaid on the video preview is fully draggable and resizable. Position it exactly over the subtitle area before processing.
Control how strong the blur effect is. Default strength of 16 handles most subtitle sizes. Increase to 25โ30 for large bold text.
The original audio track is copied without modification. Only the video image in the defined region is affected.
Unlike cropping, blurring preserves the full original frame and aspect ratio. The video dimensions remain identical to the source.
Output is encoded at high quality (CRF 18) using H.264. The result is a standard MP4 file compatible with all devices and platforms.
Click the upload area or drag your video file onto it. Supported formats: MP4, MOV, AVI, MKV.
Drag the dashed blue box over the subtitle area. Resize using the edges to cover only the subtitle region precisely.
Adjust the blur strength slider. The default value of 16 works well for standard subtitle text.
Click Apply Blur. Processing takes 1โ3 minutes. Download the finished MP4 when complete.
The feathered edges make the blur blend smoothly with the surrounding video. It looks far more natural than a rectangular mask overlay.
No. The blur is applied as a visual overlay effect. Video duration, audio, and all other properties remain exactly the same as the source.
Currently one blur region per job is supported. To blur multiple regions, process the video twice โ once for each region.
MP4, MOV, AVI, and MKV files are supported. Output is always MP4 (H.264) for universal compatibility.