Compress images to 20KB, 50KB or 100KB.
Resize and convert, too.

PRACTICAL NOTES

File size and image dimensions solve different problems

IMAGE DECISIONS

Choose the operation that solves the actual problem

File size, pixel dimensions and file format are separate properties. An online form may reject a photo because it exceeds 100KB, because it is not 600 by 600 pixels, or because it expects JPEG instead of PNG. Read the exact error before changing the file. Use Compress Image for a byte limit, Resize Image for width and height, and Convert Format when the destination does not support the current encoding. A single image may need more than one step, but changing everything at once makes it harder to tell what caused a quality problem.

When the limit is measured in KB

Choose the target closest to the form's stated maximum and keep the original. Compression can lower JPEG quality and, for difficult images, reduce dimensions. That means a result may look softer or become smaller in pixels than expected. Read the reported size and inspect faces, signatures, diagrams or fine text before using the file. A 20KB target is especially demanding for detailed photographs. If the result remains above the target, the tool has reached a practical limit for that source; it has not produced an exact-size guarantee.

When the form specifies pixels

Use the resizer to enter the required width and height. Preserve the aspect ratio when you want to avoid stretching; if the requested shape is different, crop intentionally in a tool designed for composition rather than forcing a face into the wrong proportions. The preview shows the resized result before download, so compare the subject and text at the new size. Reducing a large image is usually easier than enlarging a tiny one. Extra pixels created by enlargement do not restore missing detail.

When a format needs to change

JPG and JPEG refer to the same image format. PNG can preserve transparent areas, while JPEG fills them with a solid background. WebP and AVIF may save space but are not accepted by every form or editor. The browser must be able to decode the input, especially AVIF. Conversion through a canvas exports a still frame, so animation, metadata and colour profile information may change. Open the downloaded file in the destination application before deleting the source.

For a form that requires both a particular size and a file limit, work from an untouched original, set the dimensions, then compress the output. Check the final file's extension, dimensions and bytes again after the last step. The tool processes selected images in the browser, but hosting, analytics and advertising requests are separate from that image processing. Large source images may use considerable device memory; try a smaller source when an older phone cannot finish. Name each downloaded version so it is clear which one was resized, compressed or converted. Before uploading, inspect the saved copy rather than relying only on the preview. Some receiving forms check the actual file type and byte count again on submission, so a filename alone is not enough evidence that the final version meets the rules.