Blur Background — Manual Brush
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Supports: JPG, PNG, WebP
Manual Background Blur with a Brush
Paint a mask over regions you want to blur. Unlike automatic subject detection, this tool follows the mask you create. It can be useful for portraits and product shots, but it does not infer semantic foreground and background, reproduce optical depth of field, or guarantee clean boundaries.
How to use it
- Open a JPG, PNG, or WebP image.
- Pick a brush size and paint over the background areas you want to blur.
- Adjust the blur strength slider to taste.
- Click Apply, then download your finished image.
When manual blur works best
Manual masking can suit portraits, pet photos, and product images when you want direct control over the affected regions. Accuracy depends on brush placement; compare the full-resolution output around hair, transparent objects, reflections, and fine edges.
Limitations to keep in mind
Intricate backgrounds and fine edges take more care. Zoom in and use a smaller brush near the subject. The tool re-encodes the rendered raster in the corresponding output family; JPEG and WebP use a fixed lossy quality, PNG uses lossless coding for the rendered raster, and metadata or profiles can change. The selected image is not sent to Vizua’s image-processing server, though the page can make the network requests described in the privacy policy.
Frequently Asked Questions
How do I blur just the background?
Paint a mask over the regions you want to blur, leave the subject unpainted, adjust the strength, and inspect the boundary before exporting. The tool does not detect the background for you, and the complete image is re-encoded when downloaded.
Can I adjust the blur strength after painting?
Yes. Move the blur strength slider to your liking, then click Apply. The mask you painted is kept intact.
How does this compare with automatic background blur?
This tool uses the mask you paint rather than automatic subject detection. That gives you control over the selected regions, but accuracy depends on your brush work and can require careful zooming around hair, transparent objects, reflections, and fine edges.
Is my image uploaded to a server?
The selected image is processed in your browser and is not sent to Vizua’s image-processing server. The page can still make network requests for required code, analytics, advertising, error monitoring, and other site features described in the privacy policy.
What you can do with Blur Background — Manual Brush
Paint a manual mask to blur selected regions while retaining unpainted detail. Adjust brush and blur strength, preview, and export in your browser.
Blur Background — Manual Brush is designed for quick, repeatable work in a modern browser. The controls on this page let you prepare the result without installing software or creating an account.
How to use Blur Background — Manual Brush
- Select or drop the file you want to process, or enter the information requested by the tool.
- Review the available settings before processing, especially format, dimensions, quality, color, or other details that affect the output.
- Inspect the result, download the new file, and keep the original unchanged in case you need another version.
Private by design
Your files never leave your device. All processing happens locally in your browser.
Tips for better results
- Start with the cleanest source available; a small, blurry, or heavily compressed file contains less detail to preserve.
- Check dimensions and format before downloading so the result matches the site, app, printer, or platform where you will use it.
- For large files, close unnecessary tabs and test one representative file before processing a full batch.
- Open the downloaded result once before sharing it or replacing an original.
Where Blur Background — Manual Brush fits in a workflow
Use Blur Background — Manual Brush for one-off adjustments or as a preparation step before publishing, sharing, archiving, or continuing the edit in another application. When batch processing is available, validate the settings on a small sample first and then apply them to the remaining files.