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
Hide sensitive information in screenshots
Cover names, revenue figures, keys, and messages with an opaque block before you share a screenshot publicly. Solid cover is the recommended option for sensitive text.
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 hide sensitive information in a screenshot, open BlurTool, paste the screenshot, draw a solid Cover box over every name, number, key or message, then download the flattened image. A solid cover at 100% opacity is the safest redaction because, unlike blur or pixelation, it leaves no trace of the original pixels. The screenshot never leaves your browser.
How to redact a screenshot safely
Paste the screenshot
Press Ctrl/Cmd+V or drop the file. Cover (solid block) is already selected.
Cover every sensitive item
Box each email, phone number, name, account number, API key, address and message preview.
Look for what you missed
Check browser tabs, notifications, URLs, avatars and window titles, which often leak details.
Download and share
Export a flattened PNG or JPG. The original pixels under each cover are gone.
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
- A solid cover at 100% opacity replaces the original pixels completely; nothing can be recovered from the exported file.
- Commonly missed details in screenshots: browser tabs, URL bars, notification previews, avatars and timestamps.
- 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
What is the safest way to redact a screenshot?
Draw a solid opaque box over the sensitive content and export a flattened image. Avoid blur and pixelation for secrets, and avoid highlighting tools that can be removed in editors.
Can someone remove a black box from a screenshot?
Not from a flattened image. BlurTool bakes the cover into the pixels on export, so there is no layer to remove. Redactions only fail when a tool keeps the original underneath, as some PDF and document editors do.
What should I hide before sharing a screenshot?
Emails, phone numbers, full names, addresses, account and order numbers, API keys, tokens, passwords, revenue figures you have not made public, and message previews from other people.
Is there a limit on screenshot size?
BlurTool accepts PNG, JPG or WebP images up to 20 MB, 8000 px per side and 40 megapixels.
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.
$0
Free · manual editor
available now
$9/mo
Pro · 30-day free trial
no credit card
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.