How to blur or pixelate part of an image with OnyxPDF
- Drop your image into the tool.
- Drag a box over the region to hide.
- Choose blur or pixelate and set the strength.
- Apply, repeat for other regions if needed, and download.
Why do it in your browser instead of uploading?
- Privacy-safe by architecture: the unblurred original is never uploaded to a “blur online” server — the riskiest step in the usual workflow, removed.
- Pixelate is the strong option for text and plates: heavy pixelation destroys the information, light blur only hides it.
- Region-precise: the rest of the image is untouched, pixel for pixel.
- Multiple regions per image — faces, plates and screen secrets in one pass.
Good to know (honest limits)
- Very light blur over text can sometimes be partially reversed by sharpening attacks — for anything sensitive, use strong pixelation and check the result zoomed-in.
- The effect is baked into the downloaded copy; keep the original private and safe.
Frequently asked questions
Blur or pixelate — which is safer?
Strong pixelation. It averages blocks of pixels into single colours, destroying detail. Light gaussian blur over small text can occasionally be attacked with deblurring, so for secrets choose pixelate and a strong setting.
Can I blur several areas?
Yes — apply region by region; each application is added to the image before you download.
Does the rest of the image change?
No. Pixels outside your boxes are byte-identical to the original.
Is my unblurred image uploaded?
No — that is precisely why this tool exists. Everything happens in your browser.