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Photo & Signature Resizer for Forms
Resize and crop a photo or signature to exact pixels or cm and a KB limit like 10–20 KB. Whitens signature paper. Runs in your browser, no upload.
How to use
Pick Photo or Signature — Choose the mode and a size preset, or type the exact pixels or centimetres your form asks for.
Upload and crop — Add a JPG, PNG, WebP or HEIC picture, drag the box over your face or signature, and rotate if needed.
Set the KB limit — Enter the maximum (and minimum, if the form gives one) file size in KB.
Resize and download — Check the status, compare before and after, then download the JPG and upload it to your form.
How to resize a photo or signature for an online form
Online application forms almost always say three things about the picture you upload: its dimensions (for example 200×230 pixels or 3.5×4.5 cm), its file size (for example "between 10 KB and 50 KB") and its format (nearly always JPG or JPEG). This tool handles all three in one place. Select Photo or Signature, pick a preset or type the size from your form, upload the picture, and drag the crop box over the part you need. The box is locked to the shape of the final image, so your face or signature never gets stretched. Then set the KB limit and press Resize. The tool tries many JPEG quality levels and keeps the sharpest one that still fits under your limit.
If your form only allows a tiny file, such as 20 KB for a photo, open the result and zoom in before you upload. A small file is fine as long as the face and the text in any name strip are still clear.
Why forms reject uploaded photos and signatures
Most rejections have nothing to do with the photo itself. The upload checker simply compares numbers, and if one of them is outside the allowed range the file is refused. The usual causes are:
File too large. A phone photo is usually 2–8 MB, which is hundreds of times bigger than a typical 50 KB limit.
File too small. Some portals also set a minimum, for example 10 KB, to stop blank or blurry uploads. A very small signature saved at low quality can fall below it.
Wrong dimensions. The checker may require an exact pixel size, or a width and height inside a range. A photo cropped to the wrong shape fails even when its KB size is correct.
Wrong format. PNG, HEIC and WebP files are often refused when the form asks for JPG. This tool always exports a standard baseline-compatible JPG.
Unclear content. Dark backgrounds, shadows across the paper or a face that fills too little of the frame can lead to rejection later, during manual verification.
Requirements are different for every form and they change from year to year, so this page deliberately does not list rules for specific exams or offices. Always read the size, dimensions and format printed in your own form notice or prospectus and type those exact values into the tool.
Tips for a clean signature scan
Sign with a dark pen, black or dark blue, using a fine or medium tip. Pencil and light gel ink fade badly when the file is compressed.
Use plain white paper with no lines, and sign a little larger than usual so the strokes survive resizing.
Photograph the page in daylight near a window, holding the phone parallel to the paper so your hand does not cast a shadow.
Crop tight around the signature, leaving only a small white margin. Extra empty paper makes the signature look tiny after resizing.
Leave Whiten background on. It turns grey or shadowed paper pure white and darkens the ink. Raise the strength slider if the paper still looks dirty, and lower it if thin strokes start to disappear.
For very small limits, try Black & white. A pure black-and-white signature compresses far better than a colour photo of paper.
Common mistakes to avoid
Uploading the signature in the photo field, or the other way round. The file name of each download includes "photo" or "signature" to help you keep them apart.
Using a selfie with a busy background for a form that needs a plain light background. Take a fresh photo against a white wall instead.
Stretching a picture to fit the size. Always crop to the correct shape first, which this tool does automatically.
Compressing an already compressed image again and again. Start from the original camera photo for the best quality.
Adding a name and date strip when the form does not ask for one. Only turn it on if your notice requires it.
Need a different job done? Use the Image Compressor to compress any image to a target KB size without fixed dimensions, the Image Resizer for other pixel sizes, Image to PDF when a form asks for documents as a PDF, and PDF Compress to bring that PDF under the upload limit.
Privacy: your image stays on your device
Photos and signatures are personal documents. Everything this tool does, from decoding the file to cropping, whitening and JPEG compression, runs in your browser using built-in canvas features and a WebAssembly JPEG encoder. Your picture is not uploaded to our servers, not stored, and not used for anything else. When you close or refresh the tab the image is cleared from memory. After the page has loaded you can even switch on airplane mode and the tool keeps working.
Frequently asked questions
My form says the signature must be between 10 KB and 20 KB. Can this tool do that?
Yes. Type 20 in Max KB and 10 in Min KB. The tool searches for the highest JPEG quality that stays under 20 KB. If even the best quality is still below 10 KB because the pixel size is very small, it tells you honestly instead of padding the file with junk data, and you can increase the pixel size if your form allows it.
What does the DPI setting do?
When you enter centimetres or millimetres, DPI decides how many pixels the output has (for example 3.5 cm at 200 DPI is 276 pixels wide). The DPI value is also written into the JPG header so printing software and some upload checkers read the correct physical size.
Will whitening change my signature?
No. It only evens out the paper: grey, yellowish or shadowed areas become pure white and the ink becomes darker. The shape of your strokes stays exactly the same, and blue ink stays blue unless you turn on Black & white.
Is this tool accepted by every exam or government portal?
This is an independent tool and is not approved by any exam body or government office. It produces a standard JPG at the size you choose. Always follow the exact dimensions, file size and format written in your own form notice.
Can I use photos straight from my phone camera?
Yes, including large 12–50 megapixel photos and iPhone HEIC files. Very large pictures are reduced to a safe working size first so low-memory phones do not crash, which still leaves far more detail than any form needs.
Is my photo uploaded anywhere?
No. Cropping, whitening and compression all run inside your browser on your own device. The image is not sent to our servers, and closing the tab removes it from memory.
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