Finally a truly free unlimited converter! Convert unlimited images online – 100% free, no sign-up required
Menu
CZ | EN
Date published: March 18, 2026
Last update: March 18, 2026
Author: Marek Hovorka
Category: Image Optimization
Tags: Image optimization, png compression, reduce PNG size, smaller png files, web image performance
Learn how to reduce PNG size without ruining image quality. This practical guide covers compression, resizing, color reduction, metadata cleanup, and when converting PNG to another format makes more sense.
PNG is one of the most useful image formats on the web, but it can also become frustratingly large. If you are trying to upload a PNG to a website, attach it to an email, share it in chat, or improve page speed, file size matters. A heavy PNG can slow down loading, trigger upload limits, and waste storage even when the image itself looks simple.
The good news is that there is more than one way to reduce PNG size. In some cases, you can shrink a PNG dramatically without any visible quality loss. In other cases, the best move is not compressing harder, but changing dimensions, reducing colors, stripping metadata, or converting the file to a more efficient format for the job.
This guide explains exactly how to reduce PNG size in a practical way. You will learn what makes PNG files large, which techniques work best for screenshots, logos, UI graphics, and photos, and when it is smarter to convert PNG to JPG, WebP, or another format instead.
Quick tool option: If your PNG is too large for upload or sharing, try a faster format workflow with PixConverter. For photo-like PNGs, use PNG to JPG. For web delivery with transparency support in many cases, use PNG to WebP.
To reduce PNG size well, it helps to understand why PNG files grow in the first place. PNG uses lossless compression. That means it tries to preserve image data exactly instead of throwing information away like JPG does. This is great for crisp graphics, text, logos, and screenshots, but it often creates bigger files.
Common reasons a PNG is large include:
So when someone asks how to reduce PNG size, the answer depends on what kind of PNG they have. A screenshot needs a different approach than a product photo or a transparent logo.
If you want quick wins, focus on these four actions first. They usually make the biggest difference with the least effort.
This is often the easiest and most effective method. If your PNG is 3000 pixels wide but will only be displayed at 1000 pixels, you are storing three times more width than necessary.
Before compressing anything, ask:
Reducing dimensions can cut file size dramatically while keeping visual quality high at the intended display size.
For example, a screenshot exported at a huge monitor resolution can often be resized down by 30 to 60 percent with very little practical downside.
PNG compression is not always about visible quality loss. Many PNG optimizers reduce file size by rewriting the file more efficiently, removing waste, and applying better compression strategies.
This works especially well for:
If your PNG is already the right size in pixels, a dedicated optimization pass can still save a meaningful amount.
Many PNG files are saved in truecolor mode even when they do not need millions of colors. If the image is a logo, chart, line graphic, or screenshot with limited tones, reducing the color palette can slash the file size.
This is especially effective for:
A palette-based PNG can look almost identical to the original while taking much less space.
This is the biggest missed opportunity. Many large PNG files are really photos or photo-like images that should not be PNG in the first place. If the image does not need exact lossless preservation or full transparency, converting it to JPG or WebP can produce a much smaller file.
That is often the best answer when a PNG feels impossibly large.
| PNG Type | Best Size Reduction Method | Notes |
|---|---|---|
| Screenshot | Resize, compress, reduce colors | Often shrinks well without visible damage |
| Logo with transparency | Reduce dimensions, palette optimization, WebP if supported | Keep PNG if exact edges and compatibility matter |
| Photo saved as PNG | Convert to JPG or WebP | Usually the biggest file size win |
| UI asset or icon | Palette reduction, compression | Flat colors compress very well |
| Transparent product cutout | Crop empty space, resize, WebP consideration | Transparency can keep files heavier |
Look at the current pixel dimensions before doing anything else. If the image is much larger than needed, resize it first. This alone can reduce file size more than aggressive compression.
As a simple rule, match image dimensions to actual display use:
Crop transparent margins or unused background area. This matters more than many people expect. A transparent PNG with a large empty canvas still stores information across its dimensions.
If your logo or cutout image has extra invisible padding, trim it.
Use a PNG optimizer that rewrites the file more efficiently. This process can remove redundant data and improve compression without altering the visible image.
This is ideal when:
If your image is a graphic rather than a photo, try lowering color complexity. A 256-color or otherwise reduced-palette PNG may look nearly identical on screen while being much smaller.
Be careful with:
These are more likely to show banding if color reduction is too aggressive.
Some PNG files include metadata you do not need for web use or everyday sharing. Removing extra text chunks, creation information, editing history, and other embedded data can trim file size a bit more.
This will not always create a huge reduction, but it is a useful final cleanup step.
If you have already resized and optimized the PNG but the file is still too big, ask whether PNG is truly necessary.
Consider these questions:
If not, converting can make a dramatic difference.
Practical conversion shortcuts:
Not every PNG should be turned into JPG or WebP. PNG is still the right format in many situations.
Keep PNG when you need:
For these cases, focus on resizing, trimming, palette optimization, and lossless compression rather than format replacement.
Some PNGs are oversized simply because they were saved in the wrong format. This is common with exported photos, smartphone images, and marketing visuals that include rich textures or gradients.
Convert instead of forcing PNG optimization when:
For example, if someone sends you a 6 MB PNG photo, converting it to JPG can often reduce it to a fraction of that size with acceptable visual quality. If the image is going on a website, WebP may reduce it even further.
A screenshot taken on a large monitor can be far bigger than needed for documentation, tutorials, or support articles. Resize it before uploading.
PNG is not a universal best format. Overusing it on photo-heavy pages slows performance and increases bandwidth costs.
A small object placed inside a huge transparent PNG wastes file size. Crop tightly around the subject.
A simple graphic exported as full truecolor PNG is often larger than necessary.
Sometimes the real fix is choosing JPG or WebP. Compression alone cannot solve every oversized PNG.
Use PNG only when its strengths matter, such as transparency and sharp graphics. Otherwise, convert to a more web-efficient format. Resize to display dimensions and optimize before upload.
If you are improving site performance, a good workflow is:
PNG files are often too large for email. If the image does not require transparency or lossless quality, convert it to JPG first. This is usually the simplest solution for attachment limits.
Product cutouts often rely on transparency, so PNG may still be needed. But crop tightly, remove unused canvas space, and consider WebP where supported to reduce weight.
Screenshots often compress well as PNG, but they should still be resized and optimized. Very large screenshots can often be reduced substantially without hurting readability.
There is no single percentage that fits every file, but here are realistic outcomes:
The biggest savings usually come from using the right format and the right dimensions, not from chasing extreme compression alone.
The safest methods are resizing the image to the dimensions you actually need, cropping unused areas, stripping metadata, and using lossless PNG optimization. For graphics with limited colors, palette reduction can also help while keeping the image visually very close to the original.
PNG uses lossless compression and often preserves more image data exactly. JPG uses lossy compression, which throws away some detail to achieve much smaller file sizes. That is why photos are usually far smaller as JPG than PNG.
No. Lossless PNG optimization can reduce file size without visible quality loss. But if you reduce colors too aggressively or switch to a lossy format, image quality can change.
If the image is photo-like, WebP is often a strong choice for smaller web delivery. If broad compatibility matters more and the image does not need transparency, JPG is also a practical option.
Yes. You can resize the image, crop excess transparent space, optimize the PNG, and reduce colors where appropriate. If you need a smaller alternative with transparency support, WebP may also be worth considering for web use.
Usually no, especially if the logo needs transparency or crisp edges. JPG can introduce artifacts around sharp lines and transparent backgrounds are not supported. For logos, PNG often remains the better format.
If you need to reduce PNG size, start with the basics: make the image only as large as necessary, crop empty space, optimize the file, and reduce colors when the image allows it. Those steps preserve the strengths of PNG while cutting a lot of unnecessary weight.
But also be honest about whether PNG is the right format at all. If your file is really a photo or marketing image without a strong need for lossless transparency, conversion is often the most effective fix.
Need a practical next step? Use PixConverter to switch oversized images into formats that better fit your workflow.
Choose the format that matches the job, and reducing file size becomes much easier.
