Resize Image
Set the exact dimensions a form demands — in pixels or millimetres — scale by percentage, or use a one-click preset for common photo and signature sizes. Everything runs on your device.
🔒 Your image never leaves your device — no upload, no server, no sign-up| Before | |
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| After | |
| Dimensions |
Millimetre sizes are converted to pixels at the DPI you set (300 DPI is the usual print standard). Presets are commonly requested sizes — always double-check the exact requirements on your form, as they vary by organisation.
Resizing vs compressing — which do you need?
They solve different problems. Resizing changes the image's dimensions — its width and height in pixels. Compressing changes how much storage the file takes — its size in KB. Forms often specify both: for example "200 × 230 px, under 50 KB". The reliable order is: resize first to the required dimensions, then run the result through our Compress Image to KB tool to meet the size limit. Doing it the other way round can leave you with a file that meets the KB limit but has the wrong dimensions.
How it works
- Choose your image — it is opened by your browser and never uploaded.
- Enter the target width and height in pixels or millimetres, pick a percentage, or click a preset. With aspect ratio locked, typing one dimension fills in the other.
- Press Resize image and download the result at exactly those dimensions.
Frequently asked questions
How do millimetres convert to pixels?
Pixels = mm ÷ 25.4 × DPI. At the standard 300 DPI, 35 mm ≈ 413 px and 45 mm ≈ 531 px. If your form specifies both a physical size and a DPI, enter them here; if it only gives pixels, use pixels directly — that is what the portal actually checks.
What size should a signature image be?
It depends on the form. Commonly requested signature sizes include 140 × 60 px and 300 × 120 px, often with a small file-size limit (frequently 10–20 KB). The presets above cover the usual ones — but read your form's instructions, because requirements genuinely differ between organisations, and scan your signature on a plain white background for the cleanest result.
Will enlarging a small image make it sharper?
No. Enlarging stretches the existing pixels; it cannot add detail that was never captured. If a form demands larger dimensions than your image has, the resized file will meet the dimension rule but look soft. Where possible, start from a larger original.
My resized image is still too big in KB. What now?
Dimensions and file size are separate limits. Take the resized image to our Compress Image to KB tool and set the form's KB limit there — it will keep your new dimensions wherever possible.
Is my image uploaded anywhere?
No. Resizing happens entirely in your browser on your own device. Your file is never transmitted to or stored on any server.