How to Increase Image Size in KB (When a Form Wants a Bigger File)
Some portals reject a photo for being too small. Here's why a minimum file size exists, how to raise an image's KB without wrecking it, and the one method to avoid.
Image sizes & formats
Reference guides for image dimensions and file formats: getting a photo under or over a size limit in KB, choosing between PNG, JPG and WebP, and the image sizes social platforms expect. The tools linked below run in the browser and do not upload your file.
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How to Compress an Image to 100 KB (and What to Do When It Will Not Fit)
A measured walkthrough: a 311 KB photo down to 100 KB, the order that keeps it sharp, how the target-size search works, and what to do when the image will not fit.
More Image sizes & formats guides
PNG vs JPG vs WebP: Which to Use, With Three Conversions Measured
Photos to JPG, graphics to PNG, your own site to WebP, and the three conversions people search for measured in the browser: 63.9 KB to 540.3 KB, 1.4 KB to 3.0 KB, 15.6 KB to 47.9 KB.
Facebook Cover Photo Size: Why It Crops Differently on Phones
Your cover looks perfect on desktop and beheaded on mobile. How Facebook crops the same image two ways, the safe area that survives both, and the export that stays sharp.
Best Image Sizes for Social Media (Sourced, Checked October 2026)
Image sizes for Instagram, YouTube, Facebook, X, LinkedIn and link previews, each with the platform's own help page, plus what happened when I resized a real file in the browser.