Image Mosaic & Blur
Files
Select an image file (PNG, JPG, WebP, GIF) or paste from clipboard (Ctrl+V)
Drop files here or
Accepted: JPG, JPEG, JFIF, PNG, WEBP, GIF, BMP, TIFF, TIF, SVG, HEIC, HEIF, AVIF
All processing happens in your browser — your files are never uploaded to a server.
About this Tool
AllThatConverter's Image Mosaic & Blur tool is a free, privacy-first online utility that lets you quickly mask sensitive information in screenshots and photos — such as phone numbers, bank accounts, home addresses, credentials, and faces. Featuring both rectangular drag boxes and freehand brush tools, all pixel operations run 100% locally in your browser memory without uploading any files to external servers.
100% Secure Local Processing Active
This tool runs entirely on your device via WebAssembly and browser Canvas. No files are ever sent to any remote server, ensuring complete data security.
How to Use
Upload your image (PNG, JPG, WebP, GIF) via drag and drop or paste directly from clipboard using Ctrl+V.
Choose 'Area Drag' or 'Freehand Brush' from the toolbar, and select your preferred effect (Mosaic, Blur, Blackout) and intensity.
Drag a rectangle or paint over the sensitive private details on the canvas. (Undo with Ctrl+Z, Redo with Ctrl+Y)
Select your output format (PNG, JPG, WebP) and click 'Download' or click 'Copy Image' to paste directly into your chat or document.
Key Use Cases
Social Media & Public Posts
Safely redact names, order IDs, account numbers, and addresses from receipts, invoices, and screenshot captures before sharing online.
Customer Support & Bug Reporting
Conceal private customer tokens, passwords, or emails in software screenshots before sharing across Slack, email, or ticketing systems.
Portrait & Face Privacy Protection
Apply natural Gaussian blur or pixelated mosaic over faces in group photos to protect individual privacy and portrait rights.
Instant Clipboard Workflow
Paste screenshot captures instantly with Ctrl+V, drag to redact in seconds, and click 'Copy Image' to paste right back into your messenger conversation.
Frequently Asked Questions
No. AllThatConverter uses HTML5 Canvas and client-side pixel manipulation entirely inside your browser. No image data or file bytes are ever transmitted over the network.
Mosaic divides the area into pixelated grid blocks, Blur applies a smooth Gaussian smoothing filter, and Blackout paints over the area with a solid color for complete redaction.
Yes. You can undo anytime using the toolbar button or keyboard shortcut Ctrl+Z (Redo with Ctrl+Y), or click 'Clear All' to reset all applied masks.
You can download the masked image in PNG (preserving transparency), high-quality JPG, or lightweight WebP formats, or copy the PNG directly to your clipboard.
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