Upload photograph in JPG. Upload certificate in PDF. Signature must be JPEG. If you have ever wondered why every portal seems to want something different, this guide settles the JPG vs PNG vs PDF question for Indian government and exam forms. Each format exists for a reason, and once you know what each one does well, you can convert confidently and stop guessing at upload time.
JPG vs PNG vs PDF: What Each Format Is Built For
Here is the comparison that matters for form uploads:
| Property | JPG / JPEG | PNG | |
|---|---|---|---|
| Best for | Photos and signatures | Graphics, screenshots | Documents and certificates |
| File size for photos | Small | Large | Depends on content |
| Compression | Lossy, adjustable | Lossless | Wraps images or text |
| Multi-page support | No | No | Yes |
| Accepted for form photos | Almost always | Rarely | No |
| Accepted for certificates | Sometimes | Rarely | Almost always |
Why Portals Prefer JPG for Photos and Signatures
JPEG compression is designed for photographic content. It shrinks a face photo to 20 or 30 KB while remaining perfectly recognisable, which is why nearly every Indian portal, from SSC to banking KYC, standardises on it. The format also carries the DPI tag some validators check.
When JPG hurts you
JPEG is lossy: every re-save discards a little detail. Edit your photo in as few passes as possible and keep the original. If you need the exact compression workflow, our pillar guide on how to resize a photo to 20 KB walks through it.
Where PNG Fits, and Why Forms Reject It
PNG stores every pixel exactly, which makes it excellent for screenshots, logos and graphics with sharp edges and text. That same property makes PNG photos three to ten times heavier than equivalent JPEGs, blowing through KB limits instantly. Portals therefore block PNG uploads for photos, and an upload error mentioning invalid format usually means your file is a PNG wearing the wrong extension expectations.
Converting PNG to JPG without software
Open the PNG in any editor, even Windows Paint, and use Save As with JPEG selected. On a phone, a browser-based converter does the same on-device. After converting, verify the extension reads .jpg and the size fits the limit.
Where PDF Rules: Certificates and Multi-Page Documents
PDF wraps one or many pages, preserves layout, and prints predictably, which is why marksheets, category certificates and experience letters are requested in PDF. A scanned certificate photographed as a JPG can usually be converted by using the print-to-PDF option in any browser. Size limits apply here too; our guide on how to compress a PDF to 100 KB covers the standard 100 KB ceiling.
One document, one PDF
Unless the form says otherwise, keep each certificate as its own PDF rather than merging everything. Portals map each upload field to one document, and merged files cause verification confusion.
Quick Decision Guide
- Photograph or signature field: convert to JPG, compress to the stated KB range.
- Certificate, marksheet or ID proof field: convert to PDF, one document per file.
- Screenshot needed as proof: take it as PNG for clarity, then convert to whatever the field demands.
- Format not stated: JPG for images, PDF for documents is the convention across Indian portals.
- File too heavy after conversion: reduce dimensions or scan settings before touching quality sliders.
Common Conversion Mistakes
Renaming a file extension does not convert it; a PNG renamed to .jpg is still a PNG inside and will fail validation. Similarly, embedding a photo inside a PDF does not make it a valid photo upload. Always convert through an editor or converter that actually re-encodes the file, then confirm the result opens correctly before uploading.
FAQ
The form says JPG but my phone saves HEIC. What now?
Recent iPhones capture HEIC by default. Either change the camera setting to Most Compatible so it captures JPEG, or share the photo through a converter page in your browser and download it as JPG.
Is JPEG the same as JPG?
Yes. JPG is simply the three-letter version of the JPEG extension from older systems. Portals treat .jpg and .jpeg identically.
Why does my PDF upload fail even though the size is fine?
Common causes: the PDF is password protected, it was exported from an unusual app with a damaged structure, or the portal expects a version below a certain PDF standard. Re-create it with your browser’s print-to-PDF function, which produces clean, widely compatible files.
