PNG, JPG, or WebP — Which Should You Use, and How to Convert Between Them

Most guides open with steps: upload the file, click convert, download. That part takes thirty seconds. The part that actually matters is choosing the right format first — because picking wrong means bloated files, lost transparency, or images that degrade every re-save.

Pick your format first

Here is the honest comparison. One row for each format, no filler:

Format	Best for	Transparency	Typical file size	Browser support
PNG	Logos, screenshots, icons, anything with hard edges or text	Yes (alpha channel)	Large — a 1200px logo can easily be 200–400 KB	Universal
JPG	Photos, gradients, anything where small file size matters more than pixel-perfect sharpness	No	Small — that same image might be 40–80 KB at quality 80	Universal
WebP	Web images where you want the smallest possible file without visible loss	Yes	Smallest — typically 25–35% smaller than JPG at equivalent quality	All modern browsers; IE is dead, so this is rarely a problem now

The practical rule: use PNG when the image has transparency or you need pixel-perfect sharpness (UI assets, logos). Use JPG for photographs going anywhere that does not support WebP. Use WebP for everything on a website if you can — the size savings are real and modern browsers handle it fine.

One trap people fall into: converting a screenshot from PNG to JPG to save space. Screenshots have flat colors and sharp text — exactly what JPG compression handles worst. You often end up with blur around text edges and a file no smaller than the original PNG.

How to convert between formats on Filuni

Filuni's convert image formats tool handles PNG, JPG, and WebP in any direction — including batch conversions if you have a folder of images to process. No account required, no watermarks, and the conversion runs server-side with auto-delete after processing.

1. Open the tool and drop in your image (or images — up to 10 at once).
2. Choose your target format from the dropdown: JPG, PNG, or WebP.
3. For JPG output, you can set quality (80 is a good default; go lower only for thumbnails).
4. Click Convert and download. Done.

A single image takes under a minute. A batch of twenty product photos might take two or three minutes total.

Watch out for these three traps

1. Transparency disappears when you convert PNG to JPG

JPG has no alpha channel. Convert a PNG with a transparent background — a logo, a cutout, an icon — and the transparency fills with solid white or black. On a white-background page you might not notice; paste it onto a dark background and you get an ugly rectangle. Keep the PNG, or use WebP instead (it does support transparency).

2. Re-saving a JPG as a JPG makes it worse

JPG uses lossy compression. Every time you open a JPG, edit it, and save it again as a JPG, you lose a little more quality — this compounds. If you are working on an image you will edit multiple times, keep a PNG or WebP master and export to JPG only at the end. Never treat a JPG as a source file for repeated edits.

3. WebP browser support is now good, but check your email clients

Every major browser since 2020 supports WebP without issue. The one place it still causes problems is email: Gmail and most desktop email clients do not render WebP inline. If the image is going into a newsletter or email template, use JPG or PNG.

FAQ

Does converting JPG to PNG improve image quality?

No. Converting to PNG just wraps the existing pixels in a lossless container. Any artifacts already in the JPG stay there. You get a larger file with identical visual quality. The only reason to convert JPG to PNG is if you plan to edit and re-export multiple times (to stop compounding losses), or if you need to add a transparent layer.

Is WebP always smaller than JPG?

Almost always, yes — typically 25–35% smaller at equivalent perceptual quality. The gap closes for very small images (thumbnails under 100px) and widens for large, complex photographs. For web use, WebP is nearly always the right choice unless you have a specific reason to use JPG (email, older CMS compatibility, client requirement).

What quality setting should I use when converting to JPG?

Quality 80 is the standard sweet spot — you keep about 95% of the visual quality at roughly 40–50% of the file size compared to quality 100. Go down to 70 for background images and thumbnails where you do not mind slight softness. Below 60, compression artifacts become obvious. Quality 100 is almost never worth it; the file size balloons while the visible improvement is negligible.

Can I convert multiple images at once?

Yes. The image format converter on Filuni accepts up to 10 files in one batch. Drop them all in, select the target format, and download a ZIP containing all the converted files. Useful when you are reshooting product photos or exporting a set of icons for a web project.