PNG vs JPG: Which Should You Use?

Use JPG for photographs and PNG for anything with sharp edges, text, flat colour, or transparency. That single rule covers almost every decision, and once you know the reason behind it you will pick correctly without thinking.

The two formats are built on opposite ideas. JPG throws away detail you are not meant to notice in order to make photos small. PNG keeps every pixel exactly and pays for it in size. Neither is better — they are tuned for different pictures, and using the wrong one is what makes an image look bad or weigh too much.

Lossy versus lossless

JPG is lossy. Every time you save one, the encoder discards information permanently to shrink the file, and it compresses colour more aggressively than brightness. On a photograph that loss hides in the noise and texture. PNG is lossless: it uses DEFLATE compression together with row filters to pack the data down without changing a single pixel, so what you put in is exactly what you get out.

That difference decides everything else. Lossless is why PNG is perfect for a logo you will edit ten more times. Lossy is why JPG can store a beach scene in a tenth of the space.

When JPG is the right call

Choose JPG whenever the image is a continuous-tone photograph: people, landscapes, food, anything with smooth shading and no hard edges. JPEG was designed for exactly this content, and at quality 75 to 85 the loss is invisible while the file is a fraction of a lossless copy.

• Camera photos and phone snapshots.
• Any image where a small, fast file matters more than pixel-perfect fidelity.
• Pictures you will send or upload but not keep editing.

If you have a heavy PNG photo that should have been a JPG all along, the PNG to JPG tool converts it and lets you set a background colour for any transparent areas.

When PNG is the right call

Choose PNG when the image has hard edges, text, large areas of flat colour, or transparency. Screenshots, logos, icons, charts, and diagrams all fall here. On this kind of content PNG is often smaller than JPG as well as sharper, because flat colour compresses beautifully with lossless filters.

The reason JPG fails on this content deserves a moment. JPEG stores colour at half resolution by default, using 4:2:0 chroma subsampling. On a photo you never notice. On red text against a white background it produces a smeared, muddy halo around every letter. That is the technical reason a screenshot of text should never be saved as JPG.

• Screenshots, especially of text or user interfaces.
• Logos, icons, and any graphic that needs a transparent background.
• Charts, diagrams, and line art with crisp edges.
• Any image you will crop, annotate, and re-save many times.

If you have a JPG that needs transparency or a lossless master for editing, JPG to PNG makes the conversion. Just remember that it cannot restore detail the JPG already discarded — more on that below.

PNG-8 versus PNG-24

Not all PNGs are the same weight. PNG comes in two useful flavours, and picking the right one can halve a file with no visible change.

PNG-8: palette-based

PNG-8 stores a palette of up to 256 colours and references them by index. For a flat logo, an icon, or a simple chart that uses only a handful of colours, this is tiny and lossless. If your graphic has few colours, PNG-8 is the efficient choice.

PNG-24: truecolour

PNG-24 stores full 24-bit colour — over sixteen million shades — plus an optional alpha channel for transparency. Use it for screenshots with gradients, drop shadows, or photographic elements, where 256 colours would band. It is larger, but it keeps everything.

The conversion trap nobody warns you about

Converting a JPG to PNG does not un-compress it. People expect that turning a lossy file into a lossless one will sharpen it or recover the detail JPEG removed. It does not. All you get is a perfect, lossless copy of the already-damaged pixels — usually in a much larger file.

JPG to PNG is a bigger box for the same picture, not a repair. The loss happened when the JPG was made, and it is gone.

photo.jpg   (already lost detail)  ->  1.2 MB
photo.png   (lossless copy of that)  ->  6.8 MB

Same visible quality. Five times the size. No detail regained.

The lesson: convert JPG to PNG only when you need transparency or a stable master for further editing, not to improve quality. There is nothing to improve.

What about WebP?

WebP is worth knowing because it can replace both formats on the web. It has a lossy mode that competes with JPG and a lossless mode that competes with PNG, and it supports transparency either way. For a website you control, converting a heavy PNG to WebP with the PNG to WebP tool often cuts the file substantially with no visible change. For a specific pairing between any two formats, the general image converter handles it all.

Transparency settles a lot of cases

If your image needs a transparent background, the decision is already made: JPG cannot do it. JPEG has no alpha channel, so every transparent pixel is filled with a solid colour — usually white — the moment you save. A logo meant to sit on any background will end up trapped in a white box.

PNG supports full transparency, including soft, partial edges, which is why it is the format for logos, icons, stickers, and anything that overlaps other content. When you convert a transparent PNG to JPG, choose the background colour deliberately rather than letting a default white ruin the edges. The PNG to JPG tool lets you set that colour, so a transparent graphic lands on the background you actually want.

The decision in one place

1. 1Is it a photograph? Use JPG at quality 75 to 85.
2. 2Does it have text, sharp edges, or flat colour? Use PNG.
3. 3Does it need a transparent background? Use PNG (or WebP on the web).
4. 4Will you edit it repeatedly? Keep a PNG master, export JPG last.
5. 5Only a few colours? A PNG-8 will be tiny.

Whatever you choose, a photo saved correctly can usually be trimmed further without visible loss. Run the final file through the image compressor to squeeze out the last kilobytes before you ship it.

Quick answers

Is PNG always higher quality than JPG?

PNG is always lossless, but that is not the same as looking better. For a photo, a good JPG looks identical at a fraction of the size. Quality only diverges visibly on sharp-edged content, where PNG wins.

Why is my screenshot blurry as a JPG?

JPEG halves colour resolution and compresses in blocks, which smears text and crisp edges. Save screenshots as PNG and the problem disappears.

Are these conversions private?

Yes. On Pixora every conversion runs in your browser, so the image is processed on your own device and never uploaded.