Choose a PNG
Import an icon, screenshot, UI asset, illustration or transparent image.
ImgIng / PNG compression
PNG-8 · LOCAL COMPRESSIONCompress PNG to PNG-8 without flattening transparency
This is more than “save again.” ImgIng analyses the colour distribution, refines the palette and jointly quantizes colour and alpha for transparent images.
Browser-local2–256 coloursMulti-level alphaOptional dithering
Capability quick facts
These facts describe the current product, not unshipped roadmap work.
- Processing
- Browser-local
- Controls
- 2–256 colours, optional dithering and multi-level alpha
- Best for
- Icons, screenshots, UI assets and transparent graphics
- Avoid for
- Continuous-tone photos usually suit WebP, JPG or AVIF
Reviewed by the DataDance product and engineering team · Published · Updated
Finish in three steps
Confirm important settings before export; the processing location is always disclosed.
Tune colours and dithering
Fewer colours usually mean a smaller file; test dithering on gradients.
Inspect and download
Use the full-screen split view to verify text, gradients and transparent edges.
Why can PNG-8 be much smaller?
True-colour PNG can represent millions of colours, while many icons and interface screenshots need far fewer. PNG-8 builds a compact palette and stores a palette index per pixel, cutting redundant colour data.
Why is transparent PNG harder to compress?
Anti-aliased edges and shadows use many alpha levels, not just transparent or opaque. ImgIng preserves multi-level alpha instead of forcing soft edges into a jagged binary mask.
The 45.8 dB figure is a regression reference from one existing 256-colour sample. It is not a promise for every image; visual detail, alpha edges and file size should be evaluated together.
Batch image compression: files, folders and per-image recommendations
Does batch compression use the single-image algorithm?
Yes. Each image reuses the same content analysis, recommended format and quality without resizing. Photos often use WebP; flat graphics may use PNG. Keep the source format or choose WebP, JPG, PNG or AVIF for all files. Keep the original when there is no size benefit. Smaller files and pixel-perfect losslessness are not guaranteed.
Does selecting a folder upload my images?
No. Only the selected folder and its subfolders are read for supported images. Each file is processed, saved and its active processing resources released before the next, instead of decoding the entire queue at once. Cancelling selection keeps the existing queue.
How do I save and check batch results?
Save to a new folder when supported, or download individually. Marked output names avoid overwriting sources. The queue and downloadable report show source/result sizes, savings and reasons for retention or failure. Animated, high-bit-depth and unsupported images are not silently flattened to ordinary stills.
Updated 2026-10-10 · Live capability detection inside the tool is authoritative
Frequently asked questions
These visible answers match the current product behaviour and structured data.
Does PNG-8 destroy transparency?
No. ImgIng supports multiple alpha levels in indexed PNG instead of reducing transparency to two states.
Should photographs use PNG-8?
Usually not. WebP, JPG or AVIF is generally better for continuous-tone photos; PNG-8 suits graphics with a limited palette.
Should dithering always be enabled?
No. Dithering may improve low-colour gradients, but it can also add texture and bytes. ImgIng leaves it off by default.
Does batch compression use the single-image algorithm?
Yes. Each image reuses the same content analysis, recommended format and quality without resizing. Photos often use WebP; flat graphics may use PNG. Keep the source format or choose WebP, JPG, PNG or AVIF for all files. Keep the original when there is no size benefit. Smaller files and pixel-perfect losslessness are not guaranteed.
Does selecting a folder upload my images?
No. Only the selected folder and its subfolders are read for supported images. Each file is processed, saved and its active processing resources released before the next, instead of decoding the entire queue at once. Cancelling selection keeps the existing queue.
How do I save and check batch results?
Save to a new folder when supported, or download individually. Marked output names avoid overwriting sources. The queue and downloadable report show source/result sizes, savings and reasons for retention or failure. Animated, high-bit-depth and unsupported images are not silently flattened to ordinary stills.
Explore ImgIng
Each task page documents real settings, limits and format advice—not keyword-swapped duplicates.