Private processing
Your JPG and JPEG files are processed in the current browser tab instead of being uploaded to an ImageOptimise processing server.
Optimise JPEG and JPG images online
Reduce JPEG and JPG file sizes privately in your browser with progressive MozJPEG processing. Keep the original pixel dimensions, process up to 25 images and download the completed batch in one ZIP.
25JPEG images per batch25MBmaximum per image0image uploads
Image optimiser
Drop your images and we’ll optimise them automatically
No upload
Drop images here
or choose files from your device
JPEG, PNG, WebP or SVG · Up to 25 images · 25MB per image
Original0 B
OptimisedPending
Space savedPending
Private Files stay on your device
Automatic No settings to understand
Original size Dimensions are preserved
Built for photographic images
A JPEG optimizer that balances size and visual quality
JPEG is commonly used for photographs, gradients and colour-rich web images. ImageOptimise uses a tested progressive MozJPEG path rather than an aggressive lowest-quality export.
Automatic optimisation
Add valid images and processing begins automatically. There is no additional Optimise All step.
Honest results
If the processed JPEG is not smaller, the original is retained and no saving is claimed.
Batch ZIP download
Download one optimised JPEG or receive every completed image together in one ZIP.
How to compress an image
From original image to lighter file in three steps
No account, installation or compression expertise is required.
Add your images
Drag SVG, JPEG, PNG or WebP files into the drop area, or browse your device. You can select one image or a mixed batch of up to 25.
Let the browser optimise them
The tool validates each file and automatically uses the tested codec for its format while keeping the decoded pixel dimensions.
Review and download
See the original size, output size and genuine percentage saved. Download individually or choose Download all as ZIP.
Understand JPEG optimisation
What the JPEG optimizer changes and keeps
The tool re-encodes photographic image data efficiently while retaining the decoded width, height and JPEG output format.
Progressive encoding
Progressive JPEGs can display in improving detail while downloading and are widely supported across browsers, websites and content platforms.
Tested quality balance
The approved MozJPEG quality setting aims to reduce unnecessary file weight while avoiding visibly aggressive compression for normal digital use.
Dimensions preserved
This compressor does not resize the image. Use the separate resize tool when you intentionally need fewer pixels.
File size and visual quality
Smaller does not mean the lowest possible quality
The smallest possible file is not always the most useful file. Excessive lossy compression can create blockiness, blurred detail, colour banding or visible halos. ImageOptimise therefore uses fixed, tested settings intended for general web and digital use rather than chasing an impressive percentage at any cost.
Results naturally vary. A large camera JPEG may contain more removable encoding weight than an already compressed social image. A detailed, colourful photograph may also remain larger than a simple graphic because it contains more visual information. PNG optimisation is lossless, so its savings depend heavily on how the source file was created.
Always review important images at normal display size before publishing. Compression results depend on the image content, source encoder and previous processing history.
Current optimiser safeguards
✓Pixel dimensions are preserved by the current compressor.
✓The input image format is preserved.
✓Transparent PNG and WebP content remains supported.
✓SVG artwork remains vector content and is never silently rasterised.
✓A larger processed candidate is discarded in favour of the original.
Common uses
Optimise JPG photographs for websites and digital content
JPEG optimisation is particularly useful for photographs, editorial images, product pictures, property listings and colour-rich campaign artwork.
Websites and blogs
Prepare hero images, article photographs and interface graphics before uploading them to a CMS or landing page.
Online stores
Reduce product and category image weight before adding assets to an ecommerce catalogue.
Email and campaigns
Create lighter promotional graphics for campaign production, review and handover workflows.
Reports and presentations
Reduce the source weight of images before placing them into documents, slide decks or downloadable resources.
Portfolio and client delivery
Optimise a batch and provide the completed assets together in one convenient ZIP.
Storage and collaboration
Use smaller working copies where full original encoding weight is not required. Keep original master files separately when needed.
Browser-based privacy
Your current tab owns the temporary image batch
The optimisation code and codecs are delivered to your browser, then supported images are decoded and processed on your device. Image bytes, filenames and job data are not sent to an ImageOptimise image-processing server.
- No account is required to use the compressor.
- Each browser tab maintains its own independent temporary batch.
- Different devices on the same network do not share image sessions.
- Clear All removes the displayed batch; closing the tab ends the session.
Image compression questions
Frequently asked questions
Clear information about formats, privacy, output and batch limits.
Is JPG the same as JPEG?＋
Yes. JPG and JPEG refer to the same image format; the shorter .jpg extension became common because older systems used three-letter extensions.
Does the JPEG optimizer upload my photos?＋
No image-processing upload endpoint is used. Supported JPEG files are processed inside the current browser tab using the locally delivered MozJPEG codec.
Will JPEG optimisation resize my image?＋
No. The decoded pixel width and height are preserved. Use Resize Images when you want to change dimensions.
How much smaller will a JPEG become?＋
The result depends on image detail, source quality, metadata and previous compression. A camera original may shrink substantially, while an already optimised JPEG may change very little.
Will the image quality be reduced?＋
JPEG optimisation is lossy, but ImageOptimise uses a tested quality-focused setting rather than chasing the smallest possible file. Review important images before replacing a master copy.
What happens if the output is larger?＋
The processed candidate is discarded and the original JPEG is retained. The tool never reports a saving that did not occur.
Can I optimise several JPG images together?＋
Yes. Add up to 25 JPEG or JPG images, each no larger than 25MB, and download the completed results individually or as one ZIP.
Ready when you are
Optimise JPEG images
Optimise your next JPEG batch privately
Add up to 25 JPG or JPEG images and let progressive optimisation begin automatically.