PNG vs JPG, which to use? The short answer: use JPG for photographs and realistic images where small file size matters, and use PNG for logos, screenshots, line art, text, and anything that needs a transparent background or perfectly sharp edges. JPG uses lossy compression that throws away detail to shrink the file. PNG is lossless, so it keeps every pixel exactly. That single difference decides almost every real-world choice you will make.
Most explainers stop at "JPG is for photos, PNG is for graphics" and leave you guessing on the edge cases. This guide gives you a use-case decision table, explains why repeatedly re-saving a JPG slowly destroys it, and tells you when neither format is the right answer in 2026 (hint: WebP). By the end you will not have to ask again.
PNG vs JPG: The One-Line Rule and the Why#
Here is the rule that covers 90% of decisions:
If the image has sharp edges, flat color areas, text, or transparency, choose PNG. If it is a photo or any smooth-gradient image and file size matters, choose JPG.
Everything else is detail underneath that rule. Both PNG and JPG are raster formats, meaning they store the image as a grid of colored pixels. Neither scales up cleanly the way a vector format (like SVG) does. The real split between them is how they compress that grid of pixels and whether they support transparency.
JPG (also written JPEG) was designed in the early 1990s specifically for photographs. It exploits the fact that the human eye does not notice tiny color and brightness changes, so it discards data the eye is unlikely to miss. PNG arrived a few years later as a patent-free replacement for GIF, built to preserve graphics pixel-for-pixel and to support an alpha (transparency) channel.
Lossy vs Lossless: The Core Difference#
This is the concept that explains every other tradeoff, so it is worth getting right.
What lossy compression (JPG) actually does#
JPG uses lossy compression. When you save a JPG, the encoder breaks the image into 8x8 pixel blocks and approximates each one with a mathematical formula, dropping the high-frequency detail your eye is least sensitive to. You pick a quality level (often 0 to 100). Lower quality means smaller files and more aggressive data loss.
The result is a dramatically smaller file. A 12-megapixel photo that would be 30 MB uncompressed might be a 2 to 4 MB JPG at high quality, with no difference you can see at normal viewing size. That efficiency is why every camera and phone shoots JPG by default.
The cost shows up on the wrong content. Push the quality too low and you get visible artifacts: blocky squares, fuzzy halos around text, and "mosquito noise" along sharp edges. JPG handles smooth gradients beautifully and hard edges badly.
What lossless compression (PNG) actually does#
PNG uses lossless compression. It shrinks the file by finding patterns and repetition (a method called DEFLATE) but never discards a single pixel. Decompress a PNG and you get back the exact original, bit for bit.
That fidelity is perfect for graphics with large flat areas of identical color, like a logo, an icon, a chart, or a UI screenshot. PNG compresses those extremely well precisely because they are so repetitive. The same loss-free approach is wasteful on a photograph, where almost every pixel is slightly different, so the PNG of a photo is often several times larger than the JPG.
| Property | JPG / JPEG | PNG |
|---|---|---|
| Compression | Lossy (discards detail) | Lossless (keeps every pixel) |
| Transparency | No | Yes (full alpha channel) |
| Best for | Photographs, gradients | Logos, text, screenshots, line art |
| File size on photos | Small | Large |
| File size on flat graphics | Small but with artifacts | Small and clean |
| Re-saving repeatedly | Degrades quality each time | No degradation ever |
| Colors supported | ~16.7 million | ~16.7 million (plus transparency) |
Transparency: The Deciding Factor PNG Wins Outright#
If you need any part of the image to be see-through, the decision is made for you. JPG has no transparency support at all. Every JPG has a solid rectangular background, even if you tried to erase it. PNG supports a full alpha channel, which means each pixel can be fully opaque, fully transparent, or anything in between.
This is why logos are almost always PNG. A company logo needs to sit on a colored header one day and a white page the next without an ugly box around it. Save that logo as JPG and you bake in whatever background color was behind it.
Common cases where transparency forces PNG:
- A logo or watermark that overlays other content
- An icon or UI element with rounded corners
- A product cutout placed on different backgrounds
- A signature or stamp image
- Any sticker-style graphic with a non-rectangular shape
If you have a logo trapped inside a JPG with a white box, you cannot recover the transparency, you have to recreate it. To go the other direction and rasterize a clean scalable logo into a transparent PNG, an SVG to PNG converter does it without the background ever appearing.
File Size: Why "It Depends" Is the Honest Answer#
People expect one format to always be smaller. It depends entirely on the content.
- For a photograph, JPG wins by a wide margin, often 5 to 10 times smaller than the equivalent PNG at no visible quality loss.
- For a flat-color graphic (logo, icon, screenshot of a document), PNG is usually smaller and looks perfect, while a JPG at the same size shows muddy artifacts around the text.
The takeaway is to match the format to the content rather than picking a favorite. A screenshot of a spreadsheet should be PNG. A screenshot of a photo-heavy webpage might be smaller as JPG. When you are unsure or the file is just too heavy for a page, a free image compressor lets you compare both outputs and squeeze the size down before you upload, which directly improves page load speed.
Tip: large images are the number one cause of slow pages. Whichever format you choose, compress it before publishing. A 4 MB hero image is almost always a 200 to 400 KB image that nobody can tell apart at screen resolution.
Generation Loss: The JPG Trap Nobody Warns You About#
Here is the subtle problem that most format guides skip entirely. Because JPG is lossy, every time you open a JPG, edit it, and save it again as JPG, the encoder compresses the already-compressed image a second time. Detail you lost in the first save is gone, and the new save loses a little more on top of that.
This is called generation loss, and it compounds. Edit and re-save the same JPG a dozen times and you will see the artifacts pile up: smearing, color banding, and crunchy edges. It is the image equivalent of photocopying a photocopy.
PNG has no generation loss. You can open, edit, and save it a thousand times and the pixels never degrade, because the compression is lossless.
Practical rules to avoid the trap:
- Keep your master file in a lossless format (PNG, TIFF, or your editor's native format) and only export to JPG at the very end for delivery.
- Never use a JPG as your working copy if you plan to keep editing it.
- If you must re-edit a JPG, do all your edits in one session and save once, rather than saving between every small change.
A meme that has been re-saved across a hundred phones is the extreme version of this. Each re-share re-compresses it until the original is barely recognizable.
The Modern Third Option: WebP (and Why It Matters)#
There is a question hiding inside "PNG vs JPG" in 2026: should you even be using either of them on the web? For websites, WebP often beats both. It supports lossy compression (like JPG) and lossless compression with transparency (like PNG) in a single format, and it produces files roughly 25 to 35% smaller than JPG and PNG at comparable quality.
Every modern browser supports WebP, so for web images it is frequently the smartest pick. The catch is compatibility outside the browser: some older desktop apps, email clients, and printing workflows still expect a plain JPG or PNG. For a logo emailed to a client or a photo uploaded to a legacy system, stick with the classic format.
The short hierarchy for the web:
- Photo on a website -> WebP first, JPG as a fallback.
- Logo or graphic on a website -> WebP or PNG.
- Anything emailed, printed, or sent to a non-web tool -> JPG (photos) or PNG (graphics).
For the full breakdown of when each modern format wins, see our comparison of WebP vs AVIF vs JPEG for the web.
A Use-Case Decision Table You Can Actually Use#
Skip the theory and match your situation to a row.
| Your image is... | Use this | Why |
|---|---|---|
| A photo for a website | WebP, then JPG | Smallest file, no visible quality loss |
| A photo to email or print | JPG | Universal support, small enough |
| A company logo | PNG (or SVG source) | Needs transparency and sharp edges |
| A screenshot of an app or document | PNG | Text and UI lines stay crisp |
| A screenshot of a photo-heavy page | JPG or WebP | Mostly photographic content |
| An icon or simple illustration | PNG | Flat colors compress cleanly |
| A chart or infographic with text | PNG | Lossless keeps labels readable |
| A signature or watermark overlay | PNG | Transparency required |
| A meme with text | PNG | Avoids text-edge artifacts |
| A scanned document (color) | JPG | Photographic scan, file stays small |
| A line-art scan (black and white) | PNG | Crisp lines, no compression fuzz |
How to Convert Between PNG and JPG#
Converting is straightforward, and knowing the gotchas saves you a bad result.
Going PNG to JPG flattens the image. Any transparency gets filled with a solid background color (white by default), and the file usually gets much smaller because of lossy compression. This is the right move when you have a heavy PNG photo and do not need transparency.
Going JPG to PNG does not magically add quality or transparency. It just re-wraps the existing pixels (artifacts and all) in a lossless container, which makes the file larger for no visible benefit. The only reason to do it is if you need to keep editing without further generation loss.
To shrink either format or convert a PNG photo into a lighter JPG, run it through a browser-based image compressor that does the work locally without uploading your originals. And if you ever need an image as a data URI to embed directly in HTML or CSS, an image to Base64 converter turns either format into an inline string.
Frequently Asked Questions#
Is PNG or JPG better quality? PNG is technically higher quality because it is lossless and preserves every pixel, while JPG discards detail to save space. But "better quality" depends on the content. For a photograph, a high-quality JPG looks identical to the PNG at a fraction of the size, so the PNG advantage is wasted. For text, logos, and sharp edges, PNG's lossless quality is clearly visible and worth it.
Why are my PNG files so much bigger than JPG? PNG never throws away data, so on a photograph (where almost every pixel is slightly different) it cannot compress nearly as well as JPG's lossy method. That is normal and expected. If a PNG photo is too large for a website, convert it to JPG or WebP, or run it through an image compressor first.
Does converting JPG to PNG improve image quality? No. The JPG already lost detail when it was first saved, and wrapping those same pixels in a PNG cannot recover what is gone. You only end up with a larger file. Converting JPG to PNG is useful for editing without further generation loss, not for restoring lost quality.
Which format should I use for a logo? Use PNG for a raster logo, because it supports transparency and keeps the edges perfectly sharp on any background. JPG would bake in a solid background box and blur the edges. Ideally, keep the logo as an SVG vector source and export PNG copies at the sizes you need.
Is WebP better than both PNG and JPG? For web use, usually yes. WebP supports both lossy and lossless compression plus transparency, and produces files around 25 to 35% smaller at similar quality. The exception is anything used outside a browser (email, print, older apps), where JPG and PNG still have wider compatibility.
Should I use PNG or JPG for screenshots? Use PNG for screenshots of apps, documents, code, or anything with text and sharp UI lines, because JPG smears those edges with artifacts. The only time JPG makes sense for a screenshot is when the captured content is mostly photographic, in which case the file will be smaller as JPG or WebP.
Choosing PNG vs JPG which to use comes down to two questions: is it a photo or a graphic, and does it need transparency. Photos with no transparency go JPG (or WebP on the web). Graphics, text, screenshots, and anything see-through go PNG. Keep your master in a lossless format, export to JPG only at the end, and compress before you publish.
