PRACTICAL HOW-TO

A Pre-Upload Image Checklist

A short check before uploading can prevent repeated errors. Different destinations have different rules, so use this as a general checklist and follow the destination’s own requirements whenever they are more specific.

Before you start: Keep an untouched copy of the source file. Always follow the destination website or app’s exact upload requirements if they differ from this general guide.

1. Confirm the accepted format

Check whether the destination accepts JPG, PNG, WebP or another format. A filename extension is not proof that the file was converted correctly. If needed, export a new file with a converter and open it once before uploading.

2. Check both dimensions and bytes

Record the pixel dimensions and file size separately. The destination may enforce one or both. Use the image-size checker to inspect the file; resize for pixel limits and compress for byte limits.

3. Check orientation and crop

Make sure the image is upright and the important subject is inside the frame. Camera images may contain orientation metadata that some software handles differently. Preview the exported file rather than assuming the upload will display exactly like the original app.

4. Check transparency and text

If transparency matters, view the image over light and dark backgrounds. If the image contains small text or thin lines, inspect them at the intended display size after compression.

5. Keep a master copy

Save the original somewhere safe. Upload a delivery copy that matches the destination’s requirements. This makes it easier to produce a different size or format later without starting from an already-compressed file.

Quick decision guide

File exceeds a KB/MB limit: compress the image; resize first if its dimensions are larger than needed.
Pixel dimensions are wrong: resize or crop, then recheck file size.
Format is rejected: convert to a format the destination explicitly supports.
Visual quality changed: compare the output with the original and try a less aggressive setting.

Related tools and explanations

Image Size Checker →Convert Image →Compress to a target size →Resize Image →

This guide explains general image-handling principles. Specific requirements vary by website, device, browser and export settings; verify the final file before using it.