Hide faces or sensitive data by blurring or pixelating regions of your photo.
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Sharing screenshots of customer dashboards, bug reports, and invoices often risks accidentally exposing passwords, API tokens, home addresses, or credit card numbers. Semi-transparent pen markup tools can easily be unmasked. ImageUp provides permanent Gaussian blur and mosaic pixelation filters that destroy sensitive underlying pixel values locally on your machine before sharing.
Select the image containing confidential text, faces, or credentials.
Choose Blur or Pixelate, switch to Region mode, and drag a selection rectangle over the sensitive area.
Adjust intensity, use the 'Hold to View Original' button to audit your redaction, and download the clean image.
Permanently averages pixel matrices so underlying text or numbers cannot be recovered by adjusting brightness or contrast.
Draw rectangular masks over multiple distinct sections of the same photo (e.g. redact an email address and an account balance simultaneously).
Press and hold the Peek button to quickly verify that you have covered the intended area without over-blurring the surrounding context.
Many mobile pen tools use semi-transparent brushes that leave residual contrast underneath. Pixelation replaces the entire sub-grid with solid single-color blocks, completely eliminating character glyph outlines.
Light blurs can sometimes be approximated using AI deconvolution models. For maximum security when hiding text or numbers, use a heavy blur radius (15px+) or switch to Mosaic Pixelation with a block size larger than the text height.
Yes. In Region mode, simply drag your cursor across each separate area you want to obscure. All drawn regions are composited onto the final canvas.
No. The entire redaction filter runs locally inside your web browser tab via HTML5 Canvas context. Your unredacted photo never leaves your device.
Screenshots leak details: a card number on a receipt, an email in a bug report, a face in a crowd. Drawing over text with a pen tool isn't enough, because the underlying shapes can survive a contrast adjustment.
This tool destroys the pixel data instead. Pick a Gaussian blur or a mosaic pixelation, drag a box over each sensitive area, blur multiple regions on one image, and hold the peek button to compare against the original before exporting.
Everything runs locally. The unedited screenshot never reaches a server, so the information you're hiding was never exposed in the first place.
Related reading: redacting screenshots safely.