JPG, PNG, or PDF — Which File Format Should You Actually Use?
Every time you save an image or document, you face this question. And honestly? Most people just guess. Let's clear up the confusion once and for all — with real examples, not just theory.
The GenZDoc team builds free, privacy-first file tools and writes practical guides on PDF compression, image conversion, and everyday file management.
Real-Life Example: The Logo That Arrived as a Blurry JPG
A freelancer was building a website for a restaurant client. She asked for their logo. The client sent it as a JPG — no transparency, white background baked in. She's trying to place it on a dark-coloured navbar section, and now there's a hideous white square around the logo.
Back and forth emails, a week of delays, and eventually a phone call before the client understood they needed to send a PNG file with a transparent background. The logo designer had given them both versions — they just hadn't understood the difference.
Understanding JPG vs PNG vs PDF doesn't require a computer science degree. It just requires knowing which format was designed for which job — that's exactly what this guide explains.
The Quick Answer
If you're in a rush, here's the cheat sheet:
- Photos? JPG. Always.
- Graphics with text or logos? PNG.
- Documents to share? PDF.
- Screenshots? PNG.
- Anything that needs a transparent background? PNG.
Still confused? Keep reading. I'll explain why.
JPG: The Photo Format
JPG (also called JPEG) was literally invented for photographs. It's been around since 1992, and it's still the king for anything with lots of colors and gradients.
Use JPG when:
- You're dealing with photos
- File size matters more than perfect quality
- You're uploading to social media
- You don't need transparency
Don't use JPG when:
- Your image has text (it'll get fuzzy)
- You need a transparent background
- You're working with logos or icons
JPG uses “lossy” compression — every time you save, it loses a tiny bit of quality. Save the same JPG 50 times and it'll look terrible.
PNG: The Crisp Format
PNG came along in 1996 and solved JPG's biggest problems: fuzzy text and no transparency. If you need sharp edges or see-through backgrounds, PNG is your friend.
Use PNG when:
- Your image has text
- You need transparency
- You're working with logos, icons, or graphics
- You're taking screenshots
- Quality matters more than file size
Don't use PNG when:
- You're dealing with large photos (files get huge)
- You need small file sizes for the web
PNG uses “lossless” compression. Save it 1000 times, quality stays perfect. But the files are bigger.
PDF: The Document Format
PDF isn't really an image format — it's a document format. But people use it for images all the time, especially for sharing documents that include images.
Use PDF when:
- You're sharing documents that need to look the same everywhere
- You're combining multiple pages
- You need to preserve text, fonts, and layout
- You're sending something for print
Don't use PDF when:
- You just want to share a single photo
- The recipient needs to edit the content
Real-World Scenarios
Uploading vacation photos to Instagram?
→ JPG (Instagram prefers it anyway)
Sending your logo to a designer?
→ PNG (keeps the transparent background)
Emailing an invoice?
→ PDF (looks the same on every device)
Saving a screenshot of a bug?
→ PNG (text stays readable)
Creating a photo gallery for your website?
→ JPG (smaller files = faster loading)
Common Mistakes to Avoid
- Saving logos and graphics as JPG: JPG doesn't support transparency. Any logo saved as a JPG will have a white box around it on coloured backgrounds. Always keep logos as PNG or SVG.
- Using PNG for photographs on a website: PNG files of photos are enormous — sometimes 5–10x larger than an equivalent JPG. This slows your website significantly. Use JPG (or WebP) for photos, PNG only for graphics.
- Sending editable Word files instead of PDFs: If you're sharing a final document — invoice, resume, report — always convert to PDF first. DOCX files look different on every device, and recipients can accidentally modify the content.
Pro Tips for Choosing the Right Format
💡 When in doubt for web images, use WebP
WebP is a newer format that combines the best of both worlds — smaller file sizes than JPG and PNG, with transparency support. All modern browsers support it. If your platform allows it, WebP is often the best choice for web images.
💡 Ask for the source file from designers
Whenever you commission a logo or graphic design, ask the designer for all three export formats (PNG with transparency, JPG, and SVG if available). This saves the painful round-trip email later when you realize you needed a different format.
Need to Convert?
Sometimes you've got the wrong format and need to switch. We've got you covered: