全高清(Full HD)屏幕现在是最低工作标准，甚至便宜的智能手机都配备了至少 5 万像素的摄像头，很容易忘记网络上图像大小的重要性。当有人创建网站时，将带宽考虑在内非常重要。
虽然一张大的高分辨率图像可能不会对现代宽带连接造成问题，但在您的网站上塞满高质量的资源可以将浏览体验变成真正的拖累。除此之外，您还必须支付臃肿的托管费用！
不仅仅是网站管理员必须处理太大的图像。如果您尝试将一些照片通过电子邮件发送给某人，那么一旦您必须邮寄十或二十张快照，电子邮件的总大小可能会令人震惊。这(Which)就是为什么当您想要上传、共享或托管图像时，在线图像优化器是您最好的朋友。
这是我们最喜欢的四个在线图像优化器，当互联网出现故障时，还包括一个离线选项，但您的截止日期并不在乎！另外，请务必阅读我们之前关于减小图像大小的其他方法的(other ways to reduce the size of the image)帖子。
图像测试设置
在我们进入每个图像压缩器之前，我想设置我们是如何进行测试的。这不是很科学，也不是很广泛；这只是不同压缩引擎的一系列压缩，仅此而已。
为了显示文件格式在压缩方面的差异，我们使用了JPG图像和PNG图像。有时，如果您使用不同的格式保存图像，您可以更好地压缩图像。JPG图像最适合“真实”人物、地点、事物等的图像。
PNG图像最适合用于桌面上的图标、文本、屏幕截图等。这是我们的原始JPG图像 (91 KB)：
这是我们的原始PNG图像（26 KB）：
Kraken.io
Kraken.io 最好的功能是它给了我们一个大喊“释放海妖！”的借口。每次我们使用它，但除此之外，它是我们尝试过的最快的解决方案之一，而且使用起来非常简单。
该产品有几个付费层，主要区别在于您每月可以处理多少 GB 的数据。免费的快速网络界面不允许您调整图像大小或使用其他“专业(Pro)”功能，但它是一个简单的拖放工具，我们可以在几秒钟内搞定。
最重要的是，您可以一次将多个文件排队以进行快速批处理。
您还可以通过单击轻松地从Google Drive或Dropbox导入图像。(Dropbox)在我们的测试中，Kraken将我们的(Kraken)JPG图像的大小减小了大约 15% (78 KB)，将我们的 PNG 图像的大小减小了大约 61% (10 KB)。
这是我们发布海妖后的JPG图片：(JPG)
质量有所下降，但图像看起来仍然不错，并且由于优化，您的网站将更加精简。这是压缩后的PNG图像：(PNG)
压缩后的PNG的质量几乎与原始格式相同，这就是为什么我喜欢尽可能多地使用PNG格式的原因，因为它能够进行大量压缩而不会造成质量损失。(PNG)
在 kraken.io 使用Kraken.io。
压缩机.io
Compressor承诺大幅减少文件大小。在某些情况下“高达 90%”。虽然大多数图像无法获得这种性能，但如果您更喜欢绝对文件大小而不是精细图像细节，那么Compressor是一个不错的选择。(Compressor)
该界面有吸引力且易于使用。您可以直接将图像保存到您的Google Drive或DropBox，而无需先将其下载到您的计算机，这也很好。然而，一个缺点是一次只能处理一张图像。
在我们的测试图像上使用Compressor ， JPG图像 (66 KB)的图像大小确实大幅减少了 28% 。
对于PNG图像，它将图像的大小减少了大约 67%，一直降低到大约 8 KB。这也非常接近Kraken能够做到的。
那么它对图像质量有多大影响呢？这是用于比较的JPG的(JPG)Compressor版本。
如您所见，图像中添加了大量噪声。所以这是一个更好的文件大小，但质量较差。您必须在不同的网站上尝试您的图像，才能找到在大幅减小尺寸和图像质量之间取得良好平衡的图像。
压缩器中的PNG图像看起来与Kraken中的一模一样，所以我不在这里包括它。
在compressor.io(compressor.io)使用Compressor.io
优化
Optimizilla因其治愈吉祥物获得了即时的吸引力，但它也承诺采用一种平衡的图像优化方法。最重要的是，您最多可以排队二十张图像。Optimizilla也有一个非常强大的界面。
Optimizilla可让您为图像设置单独的质量级别。您可以使用滑块轻松调整它，然后还可以预览与原始图像相比的结果图像。
这意味着您不必重复下载完成的文件，直到您对质量感到满意。
默认情况下，JPG (70 KB) 的文件大小减少了 23%。JPG大小比压缩器大，但比Kraken小(Kraken)。质量比压缩机好得多，可与Kraken媲美。
PNG减少了 64% ，并且与原始文件几乎没有区别。到目前为止，它看起来也与所有其他压缩版本相同。
您可以在imagecompressor.com上使用 Optimizilla 。
图像较小
ImageSmaller是另一种很好的在线压缩工具，可以提供不错的结果，即使您一次只能处理一个图像。
在我们的案例中，我们的JPG文件大小显着减少了 54%，但质量损失相当可观。如果您将图像发布到网上或出于因果目的，该图像仍然可以使用，但是以任何其他方式使用它会产生太多噪音。
同样，PNG减少了约 65%，与其他结果完全相同。
离线替代品：RIOT
虽然所有这四个图像优化器都需要有效的互联网连接，但这并不总是可行的。因此，将离线应用程序作为备份或在使在线优化不太理想的情况下，这是一个好主意。
也许您需要处理大量图像，或者出于隐私原因不想上传某些图像。
无论您出于何种原因必须使用离线客户端，我们都特别喜欢RIOT或Radical Image Optimization Tool。这款免费软件几乎可以完成所有工作，同时非常易于使用。
它有一个有趣的自动建议模式。只需将图像拖入(Simple)，它就会建议适当的压缩级别。
使用自动设置，我们可以减少 28% 的图像大小 (66 KB)。这是经过RIOT处理后的图像。与Compressor一样，尺寸更小，但噪音水平非常高。
关于RIOT(RIOT)的另一件事值得一提的是，该软件带有批量转换器模式。因此，您可以将计算机可以处理的尽可能多的图片排成队列，然后继续处理业务。与大多数免费在线解决方案相比的一大优势！
您可以在luci.criosweb.ro/riot/下载 RIOT 。
像 1,2,3 一样简单
使用这些图像优化工具，您可以让您的网站更快地加载或在您的网络服务器上节省一些空间，或通过电子邮件将可管理的图片发送给朋友和家人。
将那些吃得过多的图像缩小到更可口的东西是快速和容易的。你甚至不必放下任何钱。现在，无论您以哪种方式看待它，这都是一笔不错的交易！享受！
4 Great Online Image Compressors and Optimizers
With Full HD screеns now a working minimum standard and even cheap smartphones pаcking at least five megapixel cameras, it’s easy to forget how much image size matters on the web. When someone creates a website, it’s inсredibly imрortant to take bandwidth іnto account.
While one large, high-resolution image might not pose a problem to a modern broadband connection, stuffing your site with high-quality assets can turn the browsing experience into a real drag. In addition to this, you also have to pay for the bloated hosting costs!
It’s not just webmasters who have to deal with images that are too big. If you’ve tried emailing some photos to someone, the total size of the email might come as a shock once you have to mail ten or twenty snaps. Which is why an online image optimizer is your best friend when you want to upload, share or host images.
These are four of our favorite online image optimizers with a bonus offline option included for when the internet goes down, but your deadlines don’t care! Also, be sure to read our previous post on other ways to reduce the size of the image.
Image Test Setup
Before we get into each image compressor, I want to setup how we did our test. It’s not very scientific or expanse; it’s just a series of compressions by different compression engines and that’s it.
To show the difference that the file format makes in terms of compression, we used a JPG image and a PNG image. Sometimes you can compress your image a lot better if you save it using a different format. JPG images are best suited for images of “real” people, places, things, etc.
PNG images are best suited for icons, text, screenshots of windows on your desktop, etc. Here is our original JPG image (91 KB):
And here is our original PNG image (26 KB):
Kraken.io
Kraken.io’s best feature is the fact that it gives us an excuse to yell “release the kraken!” every time we use it, but apart from that, it’s one of the fastest solutions we’ve tried and pretty simple to use.
There are several paid tiers of the product, differing mainly by how many gigabytes of data you can process per month. The free quick web interface doesn’t allow you to resize images or use other “Pro” features, but it is a simple drag and drop tool we could figure out in just a few seconds.
Best of all, you can queue multiple files at once for quick batch processing.
You can also easily import images from Google Drive or Dropbox with a click. In our test, Kraken reduced the size of our JPG image by about 15% (78 KB) and our PNG by about 61% (10 KB).
Here is the JPG image after we released the kraken:
There is some loss in quality, but the image still looks pretty good and your website will be more streamlined thanks to the optimization. Here is the PNG image after compression:
The quality of the compressed PNG is almost identical to the original, which is why I love using the PNG format as much as possible because of its ability to be heavily compressed without as much loss in quality.
Use Kraken.io at kraken.io.
Compressor.io
Compressor promises drastic file size reduction. “Up to 90%” in some cases. While most images won’t get that sort of performance, Compressor is a good choice if you favor absolute file size over fine image detail.
The interface is attractive and easy to use. It’s also nice that you can save an image directly to your Google Drive or DropBox without first downloading it to your computer. One downside, however, is the fact that only one image can be processed at a time.
Using Compressor on our test image, there was indeed a very aggressive 28% reduction in image size for the JPG image (66 KB).
For the PNG image, it reduced the size of the image by about 67%, all the way down to about 8 KB. This is very close to what Kraken was able to do also.
So how much did it affect image quality? Here’s the Compressor version of the JPG for comparison.
As you can see, there’s a significant amount of noise added to the image. So it’s a better file size, but with less quality. You’ll have to try your images on different sites to find one that strikes a good balance between substantial size reduction and image quality.
The PNG image from compressor looked exactly like the one from Kraken, so I’m not including it here.
Use Compressor.io at compressor.io
Optimizilla
Optimizilla gets instant attractiveness points for its cure mascot, but it also promises a balanced approach to image optimization. On top of this, you can queue up to twenty images. Optimizilla also has a very powerful interface.
Optimizilla lets you set individual quality levels for your images. You can easily adjust this with a slider and then also preview the resulting image compared to the original.
This means you don’t have to repeatedly download the finished file until you are happy with the quality.
By default we got a 23% reduction in file size for the JPG (70 KB). The JPG size is larger than compressor, but smaller than Kraken. The quality is much better than compressor and comparable to Kraken.
The PNG was reduced by 64% and again was nearly indistinguishable from the original. It also looked the same as all the other compressed versions up till now.
You can use Optimizilla at imagecompressor.com.
ImageSmaller
ImageSmaller is another good online compression tool that delivers decent results, even though you are restricted to only processing one image at a time.
In our case, we got an impressive 54% reduction in file size for our JPG with a decent amount of quality loss. The image is still workable if you’re posting it online or for causal purposes, but there’s too much noise to use it in any other way.
Again, the PNG was reduced by about 65% and was exactly the same as the other results.
An Offline Alternative: RIOT
While all four of these image optimizers require a working internet connection, that’s not always possible. So it’s a good idea to have an offline application as a backup or under circumstances that make online optimization less than ideal.
Perhaps you need to process a large number of images or don’t want to upload certain images for privacy reasons.
Whatever reason you have to use an offline client, we particularly like RIOT or Radical Image Optimization Tool. This free piece of software can virtually do it all, while being pretty easy to use.
It has an interesting automatic suggestion mode. Simple drag the image in and it will suggest a suitable level of compression.
Using the auto setting, we get a 28% reduction in image size (66 KB). Here is the image, after being processed by RIOT. As with Compressor, the size is smaller, but the noise level is very high.
Another thing worth mentioning about RIOT is that the software comes with a batch converter mode. So you can queue up as many pictures as your computer can handle and then just leave it to get on with business. A big advantage over most free online solutions!
You can download RIOT at luci.criosweb.ro/riot/.
As Easy as 1,2,3
With these image optimization tools, you’ll get your website to load faster or save some space on your web server or email manageable pictures to friends and family.
It’s fast and easy to slim those overfed images down to something more palatable. You don’t even have to put any money down either. Now that’s a good deal no matter which way you look at it! Enjoy!
