PDF or Image: Which Should You Upload?
When a form doesn't specify a format and just says 'upload your document,' here's how to decide between a PDF and an image — and how to convert either way in seconds.
When a form doesn't specify, upload a PDF for anything that's meant to be read as a document (a signed form, a certificate, a multi-page file) and an image only when the form is specifically for a photo (an ID photo, a headshot) — PDF is the safer default for documents because it prints and displays consistently across devices, while an image can get auto-rotated or resized unpredictably by whatever's on the other end.
The quick way to decide
- It's a photo of a person, a signature, or something meant to be viewed as an image → JPG or PNG
- It's a form, certificate, ID card, or anything with multiple pages or that needs to print correctly → PDF
- The form explicitly says "image" or "photo" → follow that, even if your instinct says PDF
- The form explicitly says "PDF" or "document" → follow that, even if you only have a photo of it
Converting either direction
If you have a photo and need a PDF:
If you have a PDF and need individual page images (for a form that specifically wants an image upload):
When the form gives no hint at all
If a portal just says "upload your document" with no format specified, PDF is the safer default for anything that isn't literally a photograph of a face or a signature — it's what most systems are actually built to archive and display consistently, and it's rarely wrong to submit a PDF where an image would technically also have worked.
One thing worth checking either way
Whatever format you land on, run the final file through a file checker before submitting — it validates both format and size against the specific portal's requirements in seconds, so you're not finding out you guessed wrong from a rejection.
Everything runs in your browser — nothing is uploaded anywhere during conversion.