Photo 1 - A person's face
Pixelate: just the face itself - the hair, ears, and background stay exactly as they are.
No sign-up · Runs 100% in your browser
Blur image online
Draw a box over anything private and soften it with a Gaussian blur. For truly sensitive text, a solid cover is safer - blur can sometimes be partially reversed.
See it in action
Drag the slider
Email, phone number and order number covered. All names are fictional.
Drag & drop an image here
or paste from your clipboard (Ctrl/Cmd + V) anywhere on this page
PNG, JPG, or WebP · max 20 MB · max 8000 × 8000 px · 40 megapixels · no account needed
Try an example first
Real photos and documents, each shown as actual images: Before is the original, After is the same image with the effect really applied. Open one and try it yourself.
Photos - faces, people & animals
A face close-up, a full person, and an animal. Only the subject itself is pixelated in each “After” image - everything else in the photo stays visible and unchanged, and every photo is shown in full, never cropped.
Photo 2 - A full person
Pixelate: the whole figure, head to toe, so the person cannot be recognised.
Photo 3 - An animal (dog)
Pixelate: only the dog's head - its body and the sunny field around it stay exactly as they are.
Documents & screenshots
A chat, an invoice, and an email thread, all with made-up names and numbers, with solid covers over the private details.
Example 1 - Support chat
Hide: the customer's email, phone number, and order number.
Preparing the before / after images…
Example 2 - Invoice
Hide: the billing email, account number, and total due.
Preparing the before / after images…
Example 3 - Email thread
Hide: both email addresses and the one-time sign-in code.
Preparing the before / after images…
Prefer the numbers dashboard? - revenue figures, a fictional email, phone, and API key to cover.
Quick answer
To blur part of an image online, open BlurTool's blur editor, add your photo or screenshot, drag a box over the area and set the blur strength, then download the result. Only the selected area is blurred; the rest of the image stays sharp. The image is processed in your browser and never uploaded.
How to blur part of an image
Open the image
Drop, paste or choose a PNG, JPG or WebP file. Blur is already selected as the effect.
Select the area
Drag a box over the part you want to blur. Add as many boxes as you need.
Adjust strength
Raise the strength until the detail is unreadable. Keep opacity at 100% so nothing shows through.
Download
Export a flattened PNG or JPG at the original resolution.
Cover vs blur vs pixelate
| Effect | What it does | Best for | Safe for secrets? |
|---|---|---|---|
| Cover | Replaces the area with a solid opaque block | Passwords, API keys, card and account numbers, emails | Yes, at 100% opacity |
| Pixelate | Replaces the area with large single-color blocks | Faces, people, license plates in photos | Not for short text; use large blocks |
| Blur | Smooths the area with a Gaussian blur | Backgrounds and non-critical details | No, light blur can be reversed |
Key facts
- BlurTool applies a Gaussian blur only inside the boxes you draw; the rest of the image is unchanged.
- Blur is best for backgrounds, crowds, license plates in casual photos and non-critical details.
- For passwords, API keys, card numbers and one-time codes, a solid cover is safer than blur.
- BlurTool processes images locally in the browser; the image file is never uploaded to a server.
- Exports are flattened PNG or JPG files at the original resolution, with no layers and no copied EXIF metadata.
- BlurTool accepts PNG, JPG or WebP images up to 20 MB, 8000 px per side and 40 megapixels.
- The manual editor is free and needs no account or sign-up.
Frequently asked questions
Can I blur just one part of a picture?
Yes. BlurTool only blurs the boxes you draw. You can add several boxes, each with its own strength, and the rest of the picture stays exactly as it was.
Can blurred text be un-blurred?
Sometimes. Light blur on short text such as codes or numbers can be guessed or partially reconstructed. For anything secret, use the solid Cover effect instead of blur.
Does blurring reduce image quality?
No. BlurTool exports at the original resolution. Only the selected areas change.
Do I need to install anything?
No. BlurTool works in any modern browser on desktop or mobile, with no install and no account.
More answers on the Help and FAQ page.
Everything you need to share safely
The manual editor is free forever. Advanced automation is coming with Pro.
Manual redaction editor
FREEDraw, move, and resize boxes over anything private. Zoom, pan, undo/redo, and hold-to-compare included.
Cover · Blur · Pixelate
FREEThree effects per region, with strength and an opacity slider - 100%, 75%, 50%, or 25% - baked into the export.
Private by design
FREEEditing and export run locally in your browser. No image upload, no original layers or metadata in downloads.
Auto detection
PROUNDER CONSTRUCTIONFinds emails, phone numbers and your own watch-words on your device, then covers the ones you approve.
Included in the 30-day free trial.
Bulk / Batch processing
PROUNDER CONSTRUCTIONRedact many screenshots at once with the same settings, review each one, and export the set as a ZIP.
Included in the 30-day free trial.
Saved presets
PROUNDER CONSTRUCTIONSave your effect, opacity, color, and export settings once - then reuse them on every new image.
Included in the 30-day free trial.
Free for manual editing. Pro for automation.
Start free with the full manual editor - no account, no card. Pro adds auto detection, batch processing and saved presets. Every new account gets 30 days of Pro free, with no credit card.
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For the screenshots you share every day
Revenue dashboards, sale threads and buyer chats, support tickets, invoices, and email threads all hit the same problem: one visible email, API key, or phone number can undo the whole post. The default here is a solid cover - the only effect that guarantees nothing shows through - with blur and pixelate available for softer details. New to it? Open one of the photo or document examples above and practise first.
Your next screenshot is one cover away from safe.
Open the free editor, drop in an image, and download a clean copy at full resolution - no account, no upload, no watermark.