How to Compress a Photo or Signature to 20 KB, 50 KB or 100 KB for Online Forms

Read the requirements first

Every portal sets its own rules. Note the maximum file size, the width and height in pixels (if any), and the allowed file type, which is usually JPG. Different parts of the same application can have different limits, for example a larger limit for a photo and a smaller one for a signature. This guide gives the method, but your form’s instructions decide the numbers.

The method: crop, resize, compress

1. Crop. Remove empty space around your face or signature so that the important part fills the frame. Use your phone gallery’s editor.
2. Resize to the required pixels. Open the Image Resizer, enter the width and height from the form (untick Lock aspect ratio only if the form needs an exact size), and download the result. Making a picture smaller in pixels also makes the file much smaller.
3. Compress to a target size. Open the Exact KB Image Compressor, choose 20, 50, 100 or 200 KB, or type your own, and press Compress Image.
4. Check the size shown and the picture itself. Download and upload the compressed JPG.

Choose the target size with a safety margin

The compressor counts 1 KB as 1,024 bytes, while some websites count 1,000 bytes. A file that looks like 50 KB to one program may be a little over to another. For a strict 50 KB limit, try 45 KB. The tool searches for the best quality that fits the target, and it can reduce the picture dimensions if lowering quality is not enough. Very small targets on large photos can therefore make the picture softer, which is another reason to resize and crop first.

Tips for signatures

• Sign with a dark pen on plain white paper and photograph it in even light, without shadows.
• Crop tightly so the signature fills most of the image.
• A signature has few colours, so it usually compresses well. If the edges look rough, increase the target a little.
• Keep the file as a JPG unless the form asks for another type. The compressor outputs JPG.

Tips for photographs

• Use a plain, light background and even lighting. Shadows and noise make files larger.
• Keep your face centred and avoid heavy filters or beauty effects.
• If your phone saves in HEIC format, convert it to JPG first with the Image Converter or change the camera format to JPG.
• Do not compress the same file repeatedly. Go back to the original and choose a different target.

If it still gets rejected

Reduce the target a little, crop closer, or lower the pixel size to the minimum the form allows. If the result is too blurry, raise the target slightly, since many portals allow a range. Make sure the file type is the one requested, and check that the width and height still match the rules after compressing.

Frequently asked questions