Guides — the explanations behind the numbers

Preset pages answer "what number do I need". These guides answer "why is this happening", which is usually the more useful question when an upload has failed three times.

The photo upload problem guide is a diagnostic walk-through: read the exact error string, work out whether it is about bytes, pixels, format or content, and fix that one thing. It is the page to start from if you do not yet know which rule you broke.

KB versus MB clears up the arithmetic that causes half of all confusion, including why a portal writing 1 MB and another writing 1024 KB mean the same thing, and why your phone reports a slightly different size than the upload page does.

Increasing image size in KB covers the rejection nobody expects, with the three honest mechanisms for adding weight and a frank note about which one a strict validator can detect.

Signature 10 to 20 KB is the deep dive on the hardest common window, from pen choice through trimming to reaching a floor without padding.

PDF under 500 KB turns the most widespread document cap into a per-page budget and explains the two scan settings that decide everything.

Name and date on a photograph explains what the requirement is for, which portals impose it, and how to satisfy it without a studio reprint.

Passport photo in India collects the standard the Ministry applies, the composition rules, and the differences between the passport, visa and identity-card variants.

JPG versus JPEG on portals answers a question that sounds trivial and is not, because some uploaders check the file extension and reject a perfectly valid file for having four letters instead of three.

Every guide quotes and links the official page it relies on, and each one is written for a reader whose first language is not necessarily English.