PNG vs JPG: Which Is Better?

The Short Answer

Neither format is "better" — they're built for different content. Use JPG for photographs and anything photographic (screenshots of photos, scans of prints, complex gradients): measured on this site's own converter, JPG makes a 1920 × 1080 photo 6–10× smaller than PNG with no visible difference. Use PNG for graphics — logos, icons, diagrams, UI screenshots, text — and for anything that needs a transparent background, which JPG simply cannot do.

The one-line rule: if a camera made it, JPG; if a computer drew it, PNG. The rest of this guide is the detail behind that rule and the edge cases where it bends.

Side-by-Side Comparison

The two size rows are measured output from the converter on this site — see the worked example below for the full numbers and how they were produced.

Compression: Lossless vs Lossy

This is the fundamental difference everything else flows from. PNG compression is lossless — it finds repeating patterns and encodes them more efficiently, like a ZIP file for pixels. Decompress it and you get back exactly the image that went in, byte for byte. The cost: content without repeating patterns — the natural texture, grain, and gradients of a photograph — barely compresses at all.

JPG compression is lossy. It splits the image into 8×8 pixel blocks, converts each to frequency data, and throws away the high-frequency detail human eyes are bad at noticing — fine texture in skin, foliage, fabric. That discarded data is gone forever, but on photos it buys enormous savings: in the measurements below, a Full HD photograph that needs 4.7 MB as a PNG needs 684.6 KB as a default-quality JPG that looks identical at normal viewing size.

JPG's weakness is exactly where PNG is strong: sharp edges. A black letter on a white background is the worst case for block-based frequency compression — it produces the fuzzy "ringing" halos you've seen around text in over-compressed memes. PNG encodes that same edge perfectly, and usually in fewer bytes.

Transparency: PNG's Exclusive Feature

JPG has no alpha channel — every pixel must be a fully opaque color. PNG supports full 8-bit alpha transparency: each pixel can be opaque, fully transparent, or any of 254 levels in between, which is what makes soft drop shadows and anti-aliased logo edges sit cleanly on any background.

This decides the format for you in a whole category of jobs: logos placed over colored sections, product cutouts, watermarks, game sprites, UI elements. Convert any of those to JPG and the transparent areas get flattened onto a solid background — usually white — and you're left manually re-cutting the image. If transparency matters, the PNG vs JPG debate is over before it starts.

Editing and Generation Loss

One more difference that bites people in editing workflows: JPG degrades every time you save it. Open a JPG, crop it, save — the editor re-compresses the image and discards a little more detail. Do that across ten rounds of edits and the accumulated "generation loss" becomes visible as muddy texture and blocky shadows.

PNG never degrades, no matter how many times it's opened and re-saved. So the standard workflow is: keep your work-in-progress in a lossless format (PNG, TIFF, or your editor's native format), and export a JPG once, at the end, as the delivery copy. Converting JPG to PNG before a heavy editing session is a legitimate trick — it can't restore lost detail, but it stops the bleeding.

When to Use JPG

Use JPG when the content is photographic. That is the entire test — it has nothing to do with where the file came from or what extension it arrived with.

• Any photograph — people, places, food, products, holiday shots. Measured above, JPG is 6–10× smaller than the same photo as PNG with no difference you can see at normal viewing size.
• Photos you have to send — email attachments, upload forms with a size cap, messaging apps. A 4.6 MB PNG bounces where a 700 KB JPG sails through.
• Screenshots of photographic content — a movie frame, a photo-heavy web page. The content is a photo even though a screen produced it.
• The final delivery copy of finished work. Export to JPG once, at the end, not repeatedly through the edit.
• When you need to squeeze further: dropping the quality slider from the default 92 to 80 took another 26–41% off every JPG in the table and still looks clean on screen. Below about 60, blocking and banding start to show.

The most common version of this job is a folder of camera-sized PNGs that should never have been PNGs: convert PNG to JPG and leave the quality slider between 80 and 92.

When to Use PNG

Use PNG when the image was drawn rather than captured, or when it has to come back out exactly as it went in.

• Anything with a transparent background. Not a judgement call — JPG has no alpha channel, so transparency is flattened to a solid colour on the way in. Logos over coloured sections, product cutouts, watermarks, sprites: PNG (or WebP/AVIF).
• Logos, icons, diagrams, line art. Hard edges are precisely what JPG damages — 14× more error on edge pixels than flat ones in the measurement above. Run a PNG through a palette optimizer and it is also the smallest file of the lot for this kind of content.
• Screenshots of text, code, or UI. 18× more error on the edges that make text legible. The PNG may be somewhat larger than the JPG (362.6 KB vs 281.4 KB in the test) — pay it, because the JPG is spending your text clarity to save a third of a small file.
• Working files you will keep editing. JPG loses a little on every save; PNG never does. Converting JPG to PNG before a long editing session can't restore what is already gone, but it stops the bleeding.
• Scans and archival masters. Scan once, losslessly, to PNG or TIFF and export JPGs for sharing. You can always make a JPG from a PNG; you can never get the detail back the other way.

When the Answer Is Neither

If you control the pipeline for a website, both formats are the wrong default in 2026. WebP and AVIF do both jobs — lossy and lossless, with transparency — at smaller sizes than either. Keep your PNG/JPG sources and convert at build time: see PNG vs WebP for your website for the swap, and WebP vs AVIF for choosing between the two. If you want the format-per-job list rather than a head-to-head, our image format by use case guide covers web, print, email, and archive.

The Practical Verdict

JPG is better for photos; PNG is better for everything drawn, rendered, or needing transparency. The formats are complements, not competitors — which is why both have survived thirty years of newer, technically superior rivals. When you have the wrong one for the job, conversion takes seconds: photos trapped in giant PNGs become shareable JPGs, and JPGs headed into an edit session get a lossless PNG working copy.