How to get a photo and signature accepted on an online form
Few things are as annoying as finishing a long application and having the portal refuse your photo. The rule is usually simple, but it mixes up three separate things: file size, dimensions and format. Once you can tell them apart, most rejections take a minute to fix.
The three limits, and what each one means
File size is how much storage the image takes, measured in KB. A limit such as "20 to 50 KB" is about file size. Dimensions are the image's width and height in pixels, such as 200 × 230. Format is the file type: JPG, PNG and so on. A photo can have the right dimensions and still be too heavy, or be under the KB limit and still be the wrong shape.
Some forms give dimensions in centimetres instead of pixels. Pixels depend on print resolution, so a centimetre size has no single pixel equivalent. At 200 dots per inch, for example, 3.5 × 4.5 cm works out to about 276 × 354 pixels (centimetres ÷ 2.54 × 200). Use that only if the form doesn't give its own pixel size.
Work in this order
- Read the notification first. Write down the allowed format, the minimum and maximum KB, the dimensions and any rule about background, for both the photo and the signature. They often differ.
- Start from a good original. Take the photo in daylight against a plain light wall, facing the camera, or use a recent studio photo if the form asks for one. No editing can bring back detail a dark photo never had.
- Crop to the right shape. Do this before anything else. Cropping changes the proportions; squeezing a wide photo into a tall box without cropping stretches your face.
- Resize to the required dimensions. Our Resize Image tool sets the width while keeping the proportions.
- Compress last. Use Compress Image and enter a target a little inside the limit, such as 45 KB for a 50 KB maximum. Portals don't all count a KB the same way (some use 1,000 bytes, some 1,024), so a small margin avoids a borderline rejection.
- Look at the result at full size. Your face and signature should be sharp, with no blocky patches. If they aren't, the target is too low for those dimensions.
Preparing a signature
Sign with a dark pen on plain white paper, as you normally sign. Photograph it straight on in good light so there is no shadow from your phone. Crop tightly around the signature, leaving a small border, then resize and compress as above. A thick pen usually survives compression better than a thin one. If the portal gives a dimension that is wider than it is tall, make sure the crop has the same proportions.
When you still get an error
- "File too small." Minimums are real. Compress the original again with a higher target rather than trying to inflate the small copy.
- "Invalid format." A file renamed from .png to .jpg is still a PNG. Run it through the compressor, which saves a real JPG. Transparent areas turn white when it does.
- "Dimensions don't match." Check the pixel size in the tool's result, and resize again from the original.
- The preview looks fuzzy. You have probably compressed an already compressed copy. Keep your original untouched and always start again from it.
Keep a small kit
If you apply to many exams or jobs, keep one folder with the original photo, the original signature and each version you have made, named with its size, such as photo-200x230-45kb.jpg. Next time, you may already have what the form needs. Remember that requirements differ between recruiters, so the official notification always has the final word.