Private by design
Your image bytes are processed on your device. ImageOptimise does not use an image-processing upload endpoint for this tool.
Compress and optimise images online
Use the free online image optimizer to reduce SVG, JPEG, PNG and WebP file sizes directly in your browser. Add up to 25 images, preserve their intended dimensions and download every completed result in one ZIP.
25images per batch25MBmaximum per image4supported formats
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 a quicker workflow
A practical image compressor for everyday files
ImageOptimise removes the separate upload, settings and processing steps used by many online tools. Once you select valid images, optimisation starts automatically in the current browser tab.
Automatic processing
There is no extra Optimise All button. Add supported images and the format-specific processing queue begins.
Honest file decisions
If the processed candidate is not smaller, the original file is retained rather than claiming a saving that did not happen.
One ZIP download
Download a single result or collect every completed image in one ZIP without repeating the download process.
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.
Format-aware optimisation
SVG, JPEG, PNG and WebP need different treatment
Vector markup, photographs and transparent interface graphics are not encoded in the same way. ImageOptimise keeps the input format and applies an appropriate processing path instead of forcing every image through one generic browser export.
JPEG photographs
JPEG is normally suited to photographs and images containing many colours or gradients. MozJPEG creates a progressive JPEG at the approved quality balance, aiming for a useful reduction without resizing the image.
PNG graphics and screenshots
PNG is commonly used for screenshots, interface graphics, logos and transparency. OxiPNG performs lossless optimisation, so decoded pixels and transparent areas remain intact.
Modern WebP images
WebP can store photographs, graphics and transparency efficiently. libwebp re-encodes supported WebP inputs at the approved quality setting while retaining the WebP format.
Scalable vector artwork
SVG logos, icons and illustrations remain vector files. The separate SVG path validates safe markup and reduces structural overhead without applying raster quality loss.
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
Prepare lighter images for websites, work and sharing
Reducing unnecessary image weight can make files easier to publish, transfer and organise while leaving their width and height unchanged.
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.
Are my images uploaded to ImageOptimise?＋
No image-processing upload endpoint is used by this compressor. The supported image files are processed inside the current browser tab using locally delivered codecs.
How many images can I compress at once?＋
You can add up to 25 supported images in one batch. Each individual image can be up to 25MB, subject to the available memory and performance of your device.
Which image formats are supported?＋
The optimiser supports SVG, JPEG, PNG and WebP. SVG uses a safety-aware vector path; JPEG, PNG and WebP continue through their tested raster codecs.
Will compression resize my image?＋
No. This tool keeps the decoded pixel width and height. A future resize tool will handle deliberate dimension changes separately.
Why does an image show Already optimised?＋
The processed candidate was not smaller than the input. ImageOptimise retains the original file and reports no saving instead of replacing it with a larger output.
Why do savings vary between images?＋
File size depends on image detail, colours, dimensions, source settings, metadata and whether the image was compressed previously. Two images with identical dimensions can produce very different results.
Does PNG compression remove transparency?＋
No. PNG uses the lossless OxiPNG path and retains transparent content. Transparent WebP content is also supported by the WebP processing path.
Can I download all results together?＋
Yes. Once processing has completed, Download all as ZIP creates one ZIP containing the completed outputs from the current batch.
Ready when you are
Compress images now
Compress your next image batch privately
Add up to 25 SVG, JPEG, PNG or WebP images and let optimisation begin automatically.