You've probably had this moment. You save a logo and it comes out blurry. You upload a photo to a form and the website rejects it. Or you send a screenshot to someone and the file is weirdly huge for no good reason.
Usually it's not the image. It's the format.
JPG, PNG and WebP all store a picture, but they compress it very differently. Pick the right one and everything works. Pick the wrong one and you get fuzzy edges, massive files, or an upload that never goes through.
The 30-second comparison
If you only remember one table, make it this one.
| Format | Best for | File size | Transparency |
|---|---|---|---|
| JPG | Photos, social posts | Small | No |
| PNG | Logos, screenshots | Large | Yes |
| WebP | Websites, blogs | Smallest | Yes |
That's the short version. The rest of this post explains why, and when you should ignore the table completely.
JPG: the reliable all-rounder for photos
JPG (also written as JPEG) has been around since the early 90s, and it's still what most phones and cameras use by default.
It uses lossy compression: it throws away detail your eyes are unlikely to notice, and in return the file size drops dramatically. A 25 MB raw photo can easily become a 2 MB JPG, and on a phone screen you will not see the difference.
Use JPG when:
- You're sharing holiday photos, product photos, or anything with lots of colours and gradients
- You need a small file for WhatsApp, Instagram, Facebook, or email
- An online form asks for a photo and has a size limit, like 200 KB or 500 KB
- You're uploading images where speed matters more than perfect sharpness
Avoid JPG when:
You need a transparent background. JPG simply cannot do it. That white box that appears behind logos? That's JPG showing its limits.
Also be careful with repeated editing. Every time you save a JPG, it loses a bit more quality. Edit the same file ten times and you'll see soft edges and strange blocks of colour: a bit like photocopying a photocopy.
For most photos, though? JPG is exactly what you want.
PNG: when sharpness and transparency matter
PNG was created to do the things JPG couldn't. It's lossless, which means it keeps every pixel exactly as it was. No detail is thrown away when you save.
That quality comes at a cost. PNG files are big. A photo that is 300 KB as a JPG could easily be 2 MB as a PNG.
Where PNG earns its place is transparency. If you've ever placed a logo over a coloured background and it blended in with no ugly white rectangle, that was almost certainly a PNG.
Use PNG when:
- You have a logo, icon, or signature that needs a transparent background
- You're saving screenshots, especially screenshots with text in them
- You need crisp lines and sharp edges, like in diagrams or charts
- You plan to edit the image again later and don't want quality loss each time
Avoid PNG when:
You're uploading lots of photos to a website or blog. Those large files slow your pages down: a single PNG hero photo can outweigh the rest of the page combined.
Rule of thumb: if it's a photo of real life, JPG usually wins. If it's made on a computer (text, shapes, logos), PNG is the safer choice.
WebP: the newer format you should be using on websites
WebP is Google's format, and for a long time people ignored it. That's changing fast, and for good reason.
WebP can do almost everything its rivals can: transparency like PNG, photos like JPG, even animation. The clever bit is file size. A WebP image is often 25 to 35 per cent smaller than a JPG of similar quality, and dramatically smaller than a PNG.
That matters more than most people realise. Smaller images mean faster pages, which keep visitors around for longer, and page experience is one of the things Google looks at.
Use WebP when:
- You're putting images on a website, blog, or online store
- Page speed matters to you (and it should)
- You want PNG-style transparency without the PNG file size
- You have lots of images and want to keep loading times down
Be a bit careful when:
You're sending a file to someone else. Most modern browsers and phones handle WebP perfectly well now, but older software, some government forms, and a few stubborn office tools still prefer JPG or PNG. Some application portals reject a WebP file and then happily accept the same image saved as a JPG.
So: use WebP for your own website, but keep a JPG or PNG version handy for sharing and official uploads.
So which one should you actually choose?
Just ask yourself what the image is for.
Photo for social media: JPG. Small, compatible everywhere, good enough quality.
Logo for a website or document: PNG, for the transparent background.
Signature for an online form: usually JPG on a white background, because many portals don't accept PNG.
Screenshot with text: PNG. Text in a JPG goes fuzzy quickly, especially around letters.
Going on your website: WebP, unless your platform doesn't support it.
Printing: Use your highest quality original, ideally PNG or a high-quality JPG.
A form only accepts JPG but your file is PNG or WebP: Don't retake the photo. Just convert it.
How to convert an image in under a minute
You do not need Photoshop for this, and you definitely don't need to install anything. If you have the wrong format, a free online image converter will sort it in a few clicks.
On xplosole.com, the free Image Converter does exactly that, in your browser:
- Open the Image Converter tool
- Add your image (JPG, PNG, WebP and other common formats)
- Choose the format you actually need
- Download the converted image
No signup, no watermark, no complicated settings. It's handy for the jobs that crop up again and again: converting WebP to JPG so a portal will accept it, turning a PNG screenshot into a smaller JPG for email, or saving a logo as a PNG to keep the background transparent.
Quick tip: if your problem is size rather than format, convert first and check again. Switching from PNG to JPG is often enough to get under a form's limit. If not, a quick pass with an image compressor will finish the job.
Three common mistakes
1. Saving logos as JPG. Your logo ends up stuck on a white box and looks amateur on any coloured background. If the original has transparency, keep it as PNG or WebP.
2. Uploading huge PNG photos to a blog. It looks fine on your fast connection, then takes an age on mobile data. Convert photos to WebP or JPG before uploading.
3. Converting JPG to PNG expecting better quality. It doesn't work that way. Conversion can't add back detail that was thrown away: you'll just get a bigger file with the same quality.
Frequently asked questions
Is WebP better quality than JPG? At the same file size, usually yes: WebP keeps more detail for fewer bytes. But a high-quality JPG still looks excellent. Use WebP where file size and website speed matter most.
Can I convert WebP to JPG without losing quality? There will be a tiny loss because JPG is lossy, but at normal settings it's barely noticeable for photos. For forms, sharing, and posting online, you will not see a difference.
Why does PNG support transparency but JPG doesn't? JPG simply wasn't built for it. It's a limitation of the format, not your image. If you need a transparent background for a logo or signature, stay with PNG or WebP.
Which format is best for iPhone photos? iPhones often save as HEIC, which isn't accepted everywhere. For sharing with Windows users or uploading to websites, converting HEIC to JPG is usually the easiest fix.
Will converting an image make it bigger? It can. JPG to PNG almost always increases file size without improving quality. Going the other way, PNG to JPG, or almost anything to WebP, usually makes the file smaller.
The bottom line
There is no single "best" format: only the best one for the job in front of you.
JPG for photos. PNG for logos, screenshots, and transparency. WebP for websites where speed counts.
And when a website demands a format you don't have, don't retake or rescan anything. Just run it through a free image converter and get on with your day.