PNG vs JPG: Which Format Should You Use?
Every screenshot tool, camera, and design app makes this choice for you — and it's often the wrong one for what you're doing next. A photo saved as PNG can be ten times larger than it needs to be. A logo saved as JPG gets fuzzy edges and a white box where transparency should be. This guide gives you a clear rule for picking between the two, and shows you how to fix files that are already in the wrong format.
The One-Sentence Answer
JPG for photos, PNG for everything with sharp edges, text, or transparency. That rule covers 95% of cases. The rest of this article explains why it works and where the exceptions are.
How the Two Formats Compress Images
The real difference between PNG and JPG is not quality settings or age — it's two fundamentally different compression philosophies.
JPG: Lossy, Built for Photographs
JPG (or JPEG, for the Joint Photographic Experts Group that created it) compresses by throwing data away. It analyzes the image in small blocks and discards fine detail your eye is unlikely to notice — subtle color variations, high-frequency texture. In a photo, with its millions of gradually shifting tones, this works brilliantly: files shrink to a fraction of their original size with little visible change.
The catch is that the discarded data is gone forever. Save a JPG, edit it, save again, and the damage compounds. And on content JPG wasn't designed for — sharp lines, flat colors, text — the discarded detail is exactly what you needed, producing the smudgy halos known as compression artifacts.
PNG: Lossless, Built for Graphics
PNG (Portable Network Graphics) compresses without losing anything. Every pixel you save is exactly the pixel you get back, no matter how many times the file is opened and re-saved. On graphics with large areas of flat color — screenshots, charts, logos, UI mockups — PNG compresses efficiently and keeps every edge crisp.
PNG also supports an alpha channel: real transparency, including partial transparency for smooth anti-aliased edges. JPG has no transparency at all — anything see-through gets flattened onto a solid background, usually white.
The trade-off: on photographs, PNG's lossless approach preserves every grain of sensor noise, so files balloon. A photo that's 400 KB as a JPG can easily be 4 MB as a PNG with no visible benefit.
A Practical Decision Table
| Your image | Use | Why | |-----------|-----|-----| | Photo from a camera or phone | JPG | Small files, invisible quality loss | | Screenshot with text or UI | PNG | Text stays sharp, no artifacts | | Logo or icon | PNG | Transparency + crisp edges | | Chart, diagram, infographic | PNG | Flat colors compress cleanly | | Product photo on white | JPG | It's still a photo | | Image needing a transparent background | PNG | JPG can't do transparency | | Photo you'll edit repeatedly | PNG (while editing) | No generational loss between saves | | Final photo for web or email | JPG | Bandwidth and load time win |
Two nuances worth knowing:
- Scanned documents behave like photos of paper — JPG usually wins on size, though PNG keeps small text cleaner if the scan is high-contrast.
- Web delivery increasingly has a third option: WebP often beats both formats at their own game. See our WebP image format guide for when it's worth switching.
Converting Between PNG and JPG
The most common real-world scenarios are a PNG that's too big to email or upload, and a JPG that needs a transparent background's container format for a system that demands PNG. Converting takes under a minute on File Convert Online — free, no signup:
- Open the converter page — PNG to JPG or JPG to PNG, depending on your direction
- Upload your image — drag and drop or click to browse; files up to 50 MB are free
- Click Start — the conversion runs automatically, nothing to configure
- Download — save the converted file
Uploaded and converted files are deleted automatically after one hour. If you're working with other formats — HEIC, BMP, TIFF, WebP — the general image converter handles 45+ formats through the same four steps.
What to Expect From Each Direction
PNG to JPG shrinks the file, often dramatically. Be aware that any transparent areas become solid, and the conversion is one-way in quality terms: fine detail lost to JPG compression can't be recovered later.
JPG to PNG does not improve quality — the compression artifacts baked into the JPG come along for the ride, now in a larger file. Do it when a tool or platform requires PNG input, or when you're about to start an editing workflow and want to stop any further loss. It won't add transparency either; you'd need an image editor to cut out a background.
Mistakes to Avoid
- Saving text-heavy screenshots as JPG. The fuzzy ring around every letter is JPG's block compression at work. Use PNG.
- Uploading PNG photos to your website. Visitors download megabytes for nothing. Convert to JPG (or WebP) and pages load noticeably faster.
- Re-saving JPGs over and over. Each save re-compresses. Keep a PNG or original while editing; export JPG once at the end.
- Expecting JPG to keep transparency. It never will — the format simply has no alpha channel.
FAQ
Is PNG higher quality than JPG?
For graphics, yes — PNG is lossless, so nothing degrades. For photos, a well-made JPG is visually indistinguishable from the PNG original at a fraction of the size, so "higher quality" buys you nothing you can see.
Why is my PNG so much bigger than the same image as JPG?
PNG stores photographic detail — including invisible sensor noise — exactly, while JPG discards what your eye won't miss. On photos the difference is commonly 5–10x.
Does converting JPG to PNG restore lost quality?
No. Data discarded by JPG compression is permanently gone. Converting to PNG only prevents additional loss from future saves.
Which format do social media platforms prefer?
Most platforms re-compress whatever you upload, typically to JPG-like formats for photos. Uploading a sharp, reasonably sized image matters more than the extension — we break down per-platform specifics in a separate guide.
The Bottom Line
Let the content choose the format: photographs travel as JPG, graphics and anything transparent live as PNG. When a file arrives in the wrong format for the job, the fix is a minute's work — start with the PNG to JPG converter and let the right format do the heavy lifting.