Pixel ToolboxFrom stuck to solved.
Clear, practical answers to common image, PDF and QR-code problems. Understand the cause, follow the steps, then finish the job with a free browser tool.
All guides
Choose the problem closest to yours.
How to send a photo that is too large for email or messaging
Understand MB and KB, then reduce file size without ruining the image.
Read guide↗How to scan a QR code displayed on the same phone
Use screenshots, Photos, Google Lens or the image reader—and check the destination safely.
Read guide↗How to combine receipt photos into one PDF
A reliable workflow for shooting, ordering, rotating and checking documents before submission.
Read guide↗Why transparent PNG backgrounds turn black—and how to fix them
Understand transparency, JPEG limitations and the right export format for each use.
Read guide↗How to print one large poster across 4 or 6 A4 sheets
Plan the final dimensions, grid, margins and assembly before wasting paper.
Read guide↗How to remove location and EXIF data before sharing a photo
See what a photo may reveal and create a safer sharing copy without losing your original.
Read guide↗Seven things to check when a barcode will not scan
Troubleshoot the symbology, data, quiet zone, color, size, printing and scanner.
Read guide↗How many pixels for A4 printing? A practical DPI guide
Connect pixels, millimetres and DPI to choose sensible A5, A4 and A3 image dimensions.
Read guide↗Once you know the answer, finish the job.
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