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SlimFile

Blur or pixelate part of an image

Drag over a face, a number plate or an address. The pixels underneath are replaced, not covered over.

Choose your images

up to 20 at a time.

JPGPNGWebPAVIFHEICGIFMax 15 MB each

Replaced, not covered

Each marked area is rebuilt and pasted back over itself, so the original pixels are genuinely gone from the file. That is the difference between this and drawing a shape on top in an image editor, where the detail underneath is still there for anyone who opens the layers.

Strength is measured against the size of the area you marked, so a small face and a large sign both come out unreadable rather than one being barely touched.

Pixelating is the weaker of the two if someone is determined: a heavily blocked face still carries some information, and researchers have recovered text from lightly pixelated images before. For anything that genuinely matters, use blur at full strength, or crop the area out altogether.

How to use Blur Image

  1. Add your photo

    Drop one JPG, PNG, WebP, AVIF, HEIC or GIF image, up to 15 MB. iPhone photos work as they are.

  2. Drag over what to hide

    Mark every face, number plate, address or screen you want hidden, then choose blur or pixelate and the strength.

  3. Download the result

    Apply, check the preview, and save the edited image.

Why use SlimFile for this

  • The original pixels are replaced

    Each area is rebuilt and pasted back over itself, so the detail is gone from the file — not sitting under a layer someone can remove.

  • Strength that scales with the area

    A small face and a large sign come out equally unreadable, instead of one being barely touched.

  • Free, no sign-up

    No account, no email address, no trial that runs out.

  • No watermark

    What you download is clean — nothing added to your file.

  • Deleted within an hour

    Uploads and results are removed automatically about an hour after processing. We never look inside them.

Questions

How do I blur a face in a photo online?
Add the photo, drag a box over the face, choose Blur, and apply. Mark as many faces as you need before applying — the whole group can be done in one go. No app, account or watermark.
Can I blur a number plate before posting my car for sale?
Yes — drag over the plate and apply blur at full strength. It is also worth running the photo through Remove EXIF Data afterwards, since car photos taken at home often carry the GPS location of your driveway.
Is the hidden part really gone?
Yes. Each marked area is rebuilt and pasted back over itself, so the original pixels are no longer in the file. That is the difference between this and drawing a shape on top in an image editor, where the detail underneath survives for anyone who opens the layers.
Should I blur or pixelate?
Blur is the safer of the two. A pixelated face still carries some information in the block colours, and researchers have recovered text from lightly pixelated images. Pixelating looks more deliberate, which some people prefer, but for anything that genuinely matters use blur at full strength or crop the area out altogether.
Does the strength depend on how big the area is?
Yes, deliberately. The effect is scaled to the size of the area you marked, so a small face and a large sign both come out unreadable. A fixed setting would flatten one and barely touch the other.
Can I hide several things at once?
Yes. Drag as many areas as you need before applying — every face in a group photo can be marked in one pass.

Related tools

Watermark PDF

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Remove EXIF Data

Strip location and camera data from photos before sharing.

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