FAQ

General

What is JPEGmini?

JPEGmini is a photo optimization technology that reduces the file size of JPEG photos by up to 5X while preserving the resolution and quality of the original photos.

Why should I use JPEGmini?

With JPEGmini you can store more photos on your hard drive and online photo service accounts, attach more photos to your emails and upload your photos faster to the web. If you have an image-intensive website, your pages will load faster, improving user experience, monetization, and SEO, and you’ll also reduce your storage and bandwidth costs.

Is JPEGmini a new file format?

No. JPEGmini files are in standard JPEG format, which can be viewed and edited by any browser, photo software or consumer device.

How is JPEGmini different from JPEG?

JPEGmini files are optimized JPEG files, whose parameters have been tuned to significantly reduce the file size without affecting perceptual quality.

How does JPEGmini compare with JPEG2000, JPEG-XR, WebP, or other image formats?

JPEGmini uses the standard baseline JPEG format, which is by far the established market leader in the image compression space. Newer formats such as JPEG2000, JPEG-XR and WebP have not gained significant market share yet. Although these formats presumably offer better compression than JPEG, JPEGmini’s perceptual recompression technology can produce JPEG files that are smaller in size than corresponding JPEG2000, JPEG-XR or WebP files.

How does JPEGmini work?

JPEGmini works by analyzing the input image using a unique quality detector which imitates the human visual system and based on this analysis applying the maximum amount of compression which will not cause visible artifacts. For further details, see the technology section.

How do I make sure that the quality of my photos is not affected by JPEGmini?

JPEGmini technology has undergone extensive user testing according to the ITU BT.500 standard, which proved that average users could not distinguish between original photos and JPEGmini photos. You are welcome to test the quality on your own photos: After optimizing them with JPEGmini, compare them side by side at 100% zoom (“Actual Size”), where each pixel on the screen corresponds to a pixel in the photo.

Can I print my photos after JPEGmini optimization?

Absolutely. Since JPEGmini does not alter the perceptual quality of your photos, you can print them at the same size you would print your original photos, and the prints will look exactly the same. Watch JPEGmini Pro Being tested under the loupe: https://youtu.be/xdndN5kobdg

Can I use JPEGmini after using other image editors or compression software?

Yes, JPEGmini accepts standard JPEG files as input, and outputs standard JPEG files as well. So any image editor, effects software, photo management software, etc. can be used before or after JPEGmini optimization. We recommend using JPEGmini as the last step in your photo processing flow, since any JPEG encoding (due to additional edits or processing) applied after JPEGmini optimization will eliminate the optimization benefits achieved by JPEGmini.

Does JPEGmini affect the metadata of my photos, such as the EXIF data?

All the EXIF metadata of the original photo is retained in the JPEGmini version. Users of the JPEGmini Server have an option to remove metadata if they want to further reduce the output file size.

What is the typical file size reduction I can expect from JPEGmini?

This depends on the resolution and quality of the original photo. For high-quality, full resolution photos produced by digital cameras, you can expect a reduction of 50%-80% in file size, while web images are typically reduced by 20-40%.

I tried JPEGmini and the file size reduction was very small. What happened?

JPEGmini achieves the highest file size reduction for first-generation photos created by digital cameras. Using photos that have been edited, re-sized or processed by photo editing software may cause lower reduction ratios.

Which input formats does JPEGmini support?

JPEGmini supports standard JPEG files with YCbCr and Monochrome color spaces. Other color spaces such as YCbCrK, CMYK, etc. are not supported.

What input resolutions does JPEGmini support?

The JPEGmini Web Service, JPEGmini pro and the JPEGmini Server support files with a resolution of up to 128 Megapixels for Mac, 60MP for PC. The JPEGmini app supports files with a resolution of up to 28 Megapixels.

Does JPEGmini support RAW photos as input?

JPEGmini currently accepts only JPEG photos as input.

How can I use JPEGmini on my photos?

To optimize files stored on your computer, you can use our JPEGmini Pro app. If you have a photo-intensive website and need to process a large number of images, check out our enterprise product, the JPEGmini Server, that is available both for on-premise installations and on the Amazon AWS cloud.

Do you have a plug-in available for Adobe® Lightroom®?

Yes, the JPEGmini Pro app includes a plug-in for Adobe Lightroom that integrates into your image processing flow.

Do you have a plug-in/extension available for Adobe® Photoshop®?

Yes, JPEGmini Pro includes an extension for Adobe® Photoshop® that integrates into your image processing workflow.

Do you have plug-ins available for Sketch, Aperture, or other desktop apps?

We do not currently offer plug-ins for these applications, but it's on our product roadmap.

Is your software available as a library on Mac, Linux, iOS or Android?

JPEGmini Server supports all major versions of Linux, and is implemented as a simple command-line application, which easily integrates into your existing image processing workflow. There is also a native SDK for Android and iOS. You can read more here

Do you have a WordPress plug-in for JPEGmini?

We don't currently offer a Wordpress plug-in, but it's on our product roadmap.

How can I contact JPEGmini?

For general inquiries, you can write to us at info@jpegmini.com.
For technical support please email us at support@jpegmini.com.

JPEGmini Pro

Where do I find my optimized photos?

The JPEGmini app supports two photo optimization mode: In the default mode, called “Optimize Originals”, JPEGmini replaces your original photos with the optimized JPEGmini versions. In this mode, you will find your optimized photos in the same location where the original photos resided, and under the same names. The only difference you will notice is that the file size of your photos is smaller than before.

The second mode is called “Export to Folder”. It is accessed by pressing the “Optimize Originals” button on the bottom left of the screen, or selecting “Preferences” from the settings menu. In this mode, you can select the folder in which the JPEGmini optimized files will be placed, and that’s where you will find your optimized photos. In “Export to Folder” mode your original photos are not modified.

How do I prevent the JPEGmini app from overwriting my original photos?

To preserve our original photos in “Optimize Originals” mode, you can create a copy of your photos and optimize the copy. In “Export to Folder” mode, the optimized photos are placed in the destination folder you have selected, and your original photos are not modified.

Does JPEGmini change the resolution of my photos?

By default, JPEGmini preserves the full resolution of your original photos. If you wish to reduce the resolution of your photos to further reduce their file size, open the Preferences dialog from the Settings menu, select “Export to Folder”, and check “Resize Photos”. You can select 3 default resize ratios, or manually set the maximum width or height for the output photos. Note that JPEGmini always preserves the aspect ratio of your original photos when resizing.

Why should I use the JPEGmini app?

The JPEGmini app frees up valuable space on your internal and external drives, and enables you to upload your photos to the web much faster. Once your photos are optimized, you can store many more of them in your online accounts (Picasa, DropBox, Flickr, etc.), and attach dozens of full resolution, original quality photos to your email messages.

How can I optimize my whole photo collection with the JPEGmini app?

You can drag the top-level folder where all your photos are stored, and all the photos contained in that folder and its sub-folders will be optimized. For example, you can drag your Pictures or My Pictures folder in Windows to optimize all of your photos. You can also drag a complete internal or external hard drive onto the app to optimize all of the photos in it.

Can I optimize my Dropbox folder with the JPEGmini app?

Sure, just drag it onto the app and all your Dropbox photos will be optimized. Once Dropbox detects that your local files have changed, the updated files will be synced to your Dropbox web account, reducing its size as well, so you’ll be able to store up to 5x more photos without paying for additional online storage space. And if you have other computers or mobile devices that use the same Dropbox account, the optimized files will be synced to all of them, freeing up storage space on each one of your devices.

Can I use JPEGmini with other online photo services?

Since JPEGmini makes your JPEG files smaller, uploading them to your online photo services becomes much faster, and results in less errors. In addition, JPEGmini optimization enables you to store more photos on your account without paying for more storage.

Does the JPEGmini app change the file format or other attributes of my photos?

No. JPEGmini optimizes the file size of your photos, but preserves all the other file attributes and metadata, such as creation date, photo capture date, location information, etc. Your photos remain in standard JPEG format, and can be viewed and edited by any browser, photo software or consumer device.

Does the JPEGmini app support RAW photos as input?

JPEGmini currently accepts only JPEG photos as input.

What happens if I select a folder that contains both JPEG and non-JPEG files in the JPEGmini app?

JPEGmini only processes JPEG files, so non-JPEG files will be skipped.

Does the JPEGmini app optimize photos locally, or does it upload them to the web for processing?

The JPEGmini app processes your photos locally on your computer, and does not upload any photos to the web.

Which operating systems does JPEGmini Pro support?

JPEGmini Pro runs on:
Windows 7, Windows 8 and Windows 10. Mac OS X 10.7 or higher

Which version of Adobe Lightroom does JPEGmini support?

The JPEGmini Adobe Lightroom Plug-in requires Lightroom 5 and above for Windows and Lightroom 4 and above for Mac.

Which version of Adobe Photoshop does JPEGmini support?

The JPEGmini Adobe Photoshop Extension is compatible with Photoshop CC (2015.1) and above.

In Lightroom, how is JPEGmini added to my workflow?

The JPEGmini Plugin for Lightroom is added in the export dialogue and is the last step in the export workflow. That means all the presets, metadata and other parameters that have been set will stay the same. The only change will be in the image file size.

In Lightroom File Settings, what JPEG Quality setting do you recommend so JPEGmini performs the best?

While we recommend exporting in the highest possible quality (90-100%), whatever you feel comfortable with will be OK. Remember, higher quality means higher savings.

Does the Photoshop Extension preserve metadata?

At the moment, no, but preserving metadata is on our roadmap.

In Photoshop, can I choose the quality before exporting, like in 'Save for Web'?

No, we designed the Photoshop extension to export the JPEG at quality 11 and then we optimize it. This is how we made the extension super fast and super simple.
Visit our help section for further information

JPEGmini Server

What is the JPEGmini Server?

The JPEGmini Server is an enterprise-class Linux product that optimizes your images using JPEGmini technology.

What are the benefits of using the JPEGmini Server on my images?

There are several benefits to optimizing your images using the JPEGmini Server:
# Lower storage costs
# Lower bandwidth costs
# Reduced load time for image-intensive web pages, resulting in improved user experience, monetization and SEO

How is the JPEGmini Server deployed?

The JPEGmini Server is implemented as a command-line Linux application, so you can utilize it without writing any code, or automate its execution using scripts. The JPEGmini Server is available both as an on-premise standalone product, or preinstalled on an Amazon EC2 instance.

What is the licensing model for the JPEGmini Server?

The JPEGmini Server is available under two types of licenses: On-premise installations are licensed for an annual fee, based on the number of concurrent instances that run the software. The JPEGmini Server is also available on the Amazon AWS Marketplace, where it is licensed on an hourly usage basis plus a fixed monthly fee.

What operating systems does the JPEGmini Server support?

The JPEGmini Server is supported on the following operating systems:
# RHEL 6/7
# Ubuntu 14.04LTS
# SuSE ES 11.4
# Debian 7/8
# Amazon Linux AMI 2011.09

What types of organizations or businesses use the JPEGmini Server?

Any business that stores or delivers a large number of images can benefit from using JPEGmini technology. Typical customers of the JPEGmini Server include online publishers, image-centric websites, and online photo services.

What are the differences between the JPEGmini Server and the JPEGmini consumer apps?

The JPEGmini Server has several important advantages over the JPEGmini consumer app:
# The JPEGmini Server is available on Linux, both on-premise and on the Amazon AWS cloud
# The JPEGmini Server is a command-line executable that is fully scriptable, enabling automation of the image processing flow
# Metadata can be removed from the images during optimization, resulting in a further reduction in file size
# Images with a resolution of up to 60 Megapixels are supported, while the consumer app only supports images up to 28 Megapixels.
# Two additional quality modes are supported, which enable further reduction of the image file size while keeping a constant perceptual quality

Where can I find more information about the JPEGmini Server?

Visit www.jpegmini.com/documentation/server.