Bring your images.
Choose a file, a batch, or a folder. Your original files remain untouched.
THE PIKOZIP IMAGE TOOLKIT
Auto optimize images. Review the result.
Try automatic image format comparison with decoded-preview checks. PikoZip can change formats in this tool; inspect quality and actual file sizes before download.
On-device processing
Choose a fresh format
Choose an output format, then add your images.
Up to 30 images · 10 MB per image
PNGJPEGWebPAVIF
Output settingsAuto Optimize · Preview-checked settings · Original dimensionsCustomize
Auto Optimize
Let the tool find a useful starting point
Auto Optimize compares candidate outputs and checks their decoded previews before choosing a smaller file. It adjusts candidate quality, keeps transparency, and retains the original when no smaller acceptable output is found.
Preview checks are a practical guard, not a lossless guarantee. Fine type, subtle gradients and color-critical artwork still deserve your own review. For decoded-pixel preservation at original dimensions, select Manual and Lossless PNG.
Trying multiple candidates takes more processing time than choosing one fixed format. Your device does the work and image bytes remain local.
Auto does not silently reduce dimensions. Choose a maximum width only when your destination needs a smaller image.
A SIMPLE WORKFLOW
Get started with Auto Optimize.
Find your balance.
Set format, quality, width, and an optional target size. Compare your result.
Take the lighter route.
Download one image or the whole batch in a ZIP, with folder paths preserved.
THE DETAILS THAT MATTER
Know your result.
Are my images uploaded?
No image bytes are uploaded. Your browser fetches the image codecs, then processes your selected files locally.
Will the output always be smaller?
Savings vary. A same-format, same-dimension original is retained when it is smaller. Explicit conversions may increase file size, which the result clearly shows.
Can I keep working from the original?
Yes. PikoZip does not overwrite the source file on your device. Keep your original master and download the output as a separate file.
YOUR NEXT STEP
Keep the workflow moving.
IMAGE TOOL
LEARN SOMETHING USEFUL
Website Ready Pack
Generate responsive image sizes with WebP or AVIF and PNG or JPEG fallbacks. Download images, a manifest and picture markup together in one organized ZIP.
Open toolIMAGE TOOLPNG compressor
Compress PNG images online with Smart, Balanced, Lossless or palette modes. Preserve PNG format and transparency, compare results and download a free batch.
Open toolImage compression explained
Understand lossy and lossless image compression, resizing and target file sizes. Learn why 100 KB is a goal and when keeping the original is the best result.
ExploreMAKE A LITTLE ROOM
Start optimizingYour next image, a little lighter.
Choose your format. Find your balance. Take it with you.