Blur an Image Online

Before you share a photo or screenshot, there is almost always something in it you’d rather keep private — a stranger’s face, a licence plate, a home address, an account number, a name in a chat. Blurring, pixelating, or redacting that detail takes seconds and turns an over-sharing snapshot into something safe to post. This guide explains the three ways to hide things in an image, when to use each, and how to do it without losing quality. You can do all of it with the free tool at the top of this page; everything runs in your browser.

Blur, pixelate, or redact — which should you use?

There are three common ways to obscure part of an image, and they are not equally secure:

• Blur softens an area into a smooth smear. It looks natural and unobtrusive, which makes it great for backgrounds and faces in casual photos.
• Pixelate replaces the area with large mosaic blocks — the classic “censored” look. It reads clearly as deliberately hidden, which is sometimes exactly what you want.
• Redact paints a solid, opaque bar over the area. It removes the pixels underneath entirely, so nothing can be recovered.

How to blur an image (step by step)

1. Open your image. Drag a photo onto the tool above, click Choose image, or paste one from your clipboard. PNG, JPG, WebP, GIF, and BMP all work.
2. Pick an effect. Choose Blur, Pixelate, or Redact at the top of the controls.
3. Choose what to hide. Leave Selected areas on and drag a box over each thing to obscure, or switch to Whole image to blur everything at once.
4. Set the strength. Use the blur strength or block size slider until the detail disappears. For redaction, pick a bar colour (black by default).
5. Choose a format. By default it keeps your original; switch to PNG, JPG, or WebP if you prefer.
6. Download. The effect is flattened into the image and saved straight to your device.

Blurring or hiding just one part of an image

Most of the time you only need to hide one or two things while keeping the rest of the picture crisp. With Selected areas chosen, drag a rectangle over each detail — a face, a sign, a number on a screen. Each box is obscured independently, and everything outside the boxes stays at full resolution.

Draw each box a little larger than the detail so the edges, hairline, or surrounding characters are fully covered. Made a mistake? Use Undo, or click the small ✕ on a box to remove just that one, then drag a fresh rectangle. There’s no limit on how many areas you can add, so a crowd of faces is no harder than one.

Blurring faces in a crowd

Photos from events, protests, and public spaces often include people who never agreed to appear online. Blurring their faces is the considerate choice — and in many regions it reduces legal risk too. Box each face, pick a strong blur or a chunky pixelation, and the rest of the scene stays intact. Because each region is processed separately, you can leave the people who did consent perfectly sharp.

Why redaction is the safe choice for documents

When you’re hiding text — an address on a letter, a card number on a receipt, a name in an email screenshot — a blur is risky. Researchers have repeatedly shown that blurred and even pixelated text can be reversed, because some of the original information survives the effect. A redaction bar replaces those pixels with a flat colour, so there is literally nothing left to recover.

Just as important: when you download, the bar is flattened into a single image. Unlike a PDF or document where a black box can sometimes be deleted to reveal the text beneath, a flattened image has no layers. What you cover is gone for good.

Keeping quality high

The areas you don’t touch stay exactly as they were — full resolution, untouched. Only your selected regions change. When you save:

• PNG is lossless, so the rest of the image is pixel-perfect. Best for screenshots and graphics.
• JPG re-encodes once; keep the quality slider around 90 so the result looks identical. Best for photographs.
• WebP is the modern all-rounder — usually smaller than JPG and PNG at the same quality.

GIF and BMP can be opened, but browsers can’t write them back, so those export as PNG — a lossless, widely supported result.

Is it safe? Where does the blurring happen?

The blurring, pixelating, and redacting are all done in your browser using the Canvas API — the new file is created on your own device, which is also faster than tools that round-trip your photo through a server. How any data associated with this tool is handled is described in our privacy policy. If you’re working with something highly sensitive, an offline desktop tool is always the most private option.

A few practical tips

• Redact, don’t blur, for secrets. If revealing it would matter, use a solid bar.
• Cover generously. Make boxes slightly bigger than the detail so nothing peeks out at the edges.
• Crop first if you can. Sometimes the easiest way to hide something is to remove it entirely — crop the image so it’s not in frame at all.
• Check the final file. After downloading, open the saved image and confirm every sensitive area is fully covered before you share it.

Pick the right effect, cover a little extra, and save once. With those habits, the tool above hides faces, plates, and private details in any photo or screenshot in seconds.