Guide · 4 min read
PNG vs JPG: Transparency and Quality
When PNG beats JPG and vice versa: transparency, photo quality, file size, and how to convert PNG to JPG without wrecking images.
Last updated: 2026-10-07
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The short answer
Use PNG when you need transparency or razor-sharp graphics; use JPG for photos where small files matter more than perfect pixels. Converting PNG photos to JPG shrinks them enormously; converting anything with transparency to JPG destroys the transparency.
Convert with the PNG to JPG tool for photos and the JPG to PNG tool when you need a lossless working copy — both run locally in your browser with no uploads.
Transparency is the whole decision
PNG carries an alpha channel: every pixel can be fully or partially see-through, which is why logos, icons and overlays ship as PNG. JPG carries color only — transparency is composited onto a background color, usually white, permanently.
Before converting, ask one question: does anything need to show through? Yes means PNG or WebP, full stop. No means JPG is on the table, and for photographs it is almost always the right answer.
Convert PNG to JPG in three steps
First, confirm the image is photographic — camera shots, scans, gradients — rather than a logo or screenshot with text. Photos convert beautifully; graphics convert acceptably at best.
Second, drop the file into the PNG to JPG tool and convert. Batches of similar photos convert together; mixed folders deserve a glance each, since one transparent logo in the batch needs different handling.
Third, compare at full zoom: smooth tones should look identical, and any softening should be confined to edges you don't care about. If text or line art suffered, that file stays PNG.
Quality, size and when to keep PNG
JPG quality around 80–90% is visually indistinguishable from PNG for photos at a fraction of the bytes — a 5 MB PNG photograph routinely becomes a few hundred kilobytes. Below 60%, blocky artifacts creep into skies and shadows.
Keep the PNG when transparency, tiny text, or pixel-perfect masters matter: sprites, diagrams, archival scans of documents. And keep a PNG master of anything you may re-edit — every JPG re-save loses a little more, while PNG never degrades.
Device notes
On iPhone and Android, screenshots save as PNG and photos as JPG or HEIC: convert camera shots freely, but think twice before JPG-ing screenshots headed for documentation. Phone galleries hide extensions, so check file info when a share fails on size.
On Windows and Mac, right-click file info reveals the true format before converting, and both Photos and Preview display transparency as a checkerboard or solid color depending on version — verify against the converted result, not the previewer's rendering quirks.
Frequently asked questions
Why does my converted JPG have a white background?
JPG has no transparency channel, so see-through pixels must become something — white by convention. If the transparency matters (logos, overlays, watermarks), keep the PNG or use WebP instead of converting to JPG.
Will PNG to JPG conversion blur text?
It can soften sharp edges, because JPG compression targets photographic smoothness, not crisp lines. For screenshots and graphics with small text, prefer PNG to WebP — or keep the PNG — and reserve JPG for actual photos.
Which is smaller: PNG or JPG?
For photos, JPG is dramatically smaller — often a tenth the size. For flat graphics with few colors, PNG can win. Screenshots sit in between: try both and keep the smaller, judging text sharpness at full zoom.
Should I convert JPG back to PNG?
Only to gain transparency-compatible editing or to stop further quality loss — converting never restores detail already discarded. A JPG saved as PNG keeps its current quality at a larger file size, which is worth it as a working master, not as a delivery file.
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