Can I blur only part of a screenshot, not the whole image?

Yes. The blur tool on screenshot-to.com lets you drag to select a specific region, then applies blur only to that area. The rest of the screenshot is unchanged.

What blur level should I use to hide sensitive data in a screenshot?

Use level 15 or higher for passwords, API keys, or personal information. At this level text is completely unreadable. Level 8–10 is sufficient for casual privacy but may be partially reversible with AI upscaling tools.

Is blurring enough to permanently hide text in a screenshot?

At high blur levels (15+) the original pixel data is destroyed beyond practical recovery. Subtle blur (level 1–5) can be de-blurred by AI upscaling tools. For maximum security, use level 15+ or cover the area with a solid opaque shape.

Does the screenshot blur tool upload my image to a server?

No. The tool uses the browser Canvas API to apply blur locally. Your screenshot never leaves your device — there is no server upload.

How to Blur Part of a Screenshot (Mac, Windows, iPhone, Android)

You need to share a screenshot, but it contains something private — an email address, a phone number, an API key, a bank balance. Blurring or pixelating that region before sharing protects you without having to retake the screenshot or manually crop and reconstruct it.

Here's how to do it on every platform, including a browser-based option that works everywhere with no download.

Why Blur Instead of Crop?

Cropping removes context. Blurring lets you share the full screenshot while obscuring only the sensitive part. It's better for:

Bug reports — you want to show the full UI, not a fragment
Social posts — you want to share the screen but not your email
Documentation — redacting personal data while keeping the document readable
Support tickets — hiding credentials while showing the error

Mac: Blur a Screenshot with Preview

Works on: macOS 10.14+

Open the screenshot in Preview
Click the Markup toolbar icon (pencil tip, top right) — or press ⇧⌘A
Select the Shape tool → choose a filled rectangle
Draw a rectangle over the area you want to hide
Set fill colour to black (or any solid colour) via the colour picker
Press ⌘S to save

Limitation: Preview gives you a solid block, not a true blur. For a blurred/pixelated look, use the browser tool below.

Alternative — Markup in Quick Look: Select the screenshot in Finder → press Space → click the Markup icon → draw a shape.

Windows: Blur a Screenshot with Snipping Tool or Paint

Windows 11 — Snipping Tool (22H2+):

Open Snipping Tool and take a new snip, or open an existing screenshot via File → Open
Click the Text Actions tab to detect text, then use Quick Redact to auto-blur detected names, emails, and phone numbers
Or use the pen/highlighter tools in the Draw tab to manually cover regions

Windows 10/11 — Paint:

Open the screenshot in Paint
Draw a filled rectangle over the sensitive area
Use Image → Resize on just the covered region to pixelate it: select the area, shrink it to ~10% width, then stretch it back to original size
Save as PNG

Limitation: Neither Snipping Tool nor Paint applies a Gaussian blur natively. The resize trick creates a pixelation effect. For true Gaussian blur, use the browser tool or download a free image editor like GIMP.

iPhone / iPad: Blur with Markup

Works on: iOS 13+

Take your screenshot (Power + Volume Up)
Tap the preview in the bottom-left corner before it disappears (or open it from Photos)
Tap Edit → … → Markup
Tap the + button → Shape → Square
Change the fill to a solid colour, position the shape over the sensitive area
Tap Done → Done

iOS 18+ shortcut: Tap the screenshot thumbnail → swipe up on the Markup toolbar to reveal the Blur tool (availability varies by device).

Limitation: Like Mac Preview, iOS Markup creates a solid overlay, not a blur. For a pixelated/blurred look, use the browser tool on mobile Safari.

Android: Blur with Google Photos or Samsung Gallery

Google Photos:

Open the screenshot in Google Photos
Tap Edit → Tools → Blur (Pixel devices only)
Google Photos detects subjects automatically — tap manually to blur background regions

Samsung Gallery:

Open the screenshot in Samsung Gallery
Tap the pencil (Edit) icon
Tap Draw → select a pen, set colour to the background colour, draw over the region

Limitation: Google Photos' Blur is designed for portrait background blur, not precise redaction. For accurate region blur on Android, use the browser tool in Chrome.

Any Platform: Blur with screenshot-to.com (Browser-Based)

Works on: Any device with a modern browser — no download or account needed.

Go to screenshot-to.com/screenshot-blur
Drop or select your screenshot
Drag to select the region you want to blur
Adjust the blur intensity slider
Download the result as PNG

The blur runs entirely in your browser using the Canvas API. Your screenshot is never uploaded to any server.

Blur vs. Pixelate vs. Solid Block: What's the Difference?

Method	Appearance	Reversibility	Best for
Gaussian blur	Soft, blended	Not reversible at high levels	Cosmetically clean screenshots
Pixelate	Blocky mosaic	Not reversible at low pixel sizes	Technical/dev screenshots
Solid block	Opaque fill	Completely irreversible	Maximum privacy
Subtle blur (level 5)	Barely noticeable	Potentially reversible	Low-security use

For maximum privacy: use a solid black box or a Gaussian blur at level 15+. Subtle blur (level 1–5) can sometimes be partially de-blurred with image upscaling tools.

Is Blurring Enough to Hide Sensitive Data?

For most practical purposes, yes — but the safety depends on blur level:

Level 5–8: Text is unreadable to the human eye, but AI upscaling tools may recover fragments. Adequate for sharing casually but not for highly sensitive data.
Level 12–20: Text is completely destroyed. No practical recovery is possible at this level.
Solid opaque fill: 100% irreversible. The gold standard for legal, medical, or financial data.

For passwords, API keys, or credentials: always use level 15+ or a solid block, not a light blur.

Frequently Asked Questions

Can I blur only a specific region, not the whole image? Yes — the blur tool on screenshot-to.com supports region selection. Drag to select the area, then apply blur just to that selection.

What's the best blur level to use? For casual sharing: level 8–10 is visually clean and practically unreadable. For sensitive data: level 15+.

Does blurring change the file size? Slightly. Blurred regions have less detail and compress more efficiently, so the file may be fractionally smaller.

Can I blur multiple regions in one image? Yes — select a region, blur it, then select the next region. Each application is cumulative.

Is there a blur tool for batch processing? screenshot-to.com processes one image at a time. For batch redaction, Tesseract CLI + ImageMagick or Adobe Acrobat's redaction tool handles batches.