Compress PNG
to 100 KB
Reduce any PNG image to under 100 KB automatically. Perfect for social media uploads, web page images, email attachments. Free, no signup required.
Drop PNG files here to compress to 100 KB
or click to select files from your computer
Up to 20 files - max 20 MB each - ZIP for 3+ files
What This Tool Does
This tool compresses your PNG image until it reaches 100 KB or smaller. It uses an iterative binary-search algorithm - adjusting compression quality across multiple passes - so you get the best possible visual quality at your exact target size.
Full transparency is preserved. If your image is already under 100 KB, it will be lightly optimized and returned with metadata stripped. Need a different target? Pick another size from the presets above.
When to Use 100 KB
The 100 KB limit is common for: social media uploads, web page images, email attachments. Many platforms enforce strict file size limits on uploads, and exceeding them silently fails or degrades image quality during their re-compression.
Compressing to exactly the right size yourself gives you full control over visual quality. Use our PNG to 8-Bit converter first if your image is a logo or icon - combining both tools often achieves the smallest possible output.
How to Compress PNG to 100 KB
- The target is pre-set to 100 KB. You can change it using the preset buttons above at any time.
- Drop up to 20 PNG files into the upload area, or click "Browse Files" to select them. Each file uses the target size active at that moment.
- The tool automatically finds the highest quality that still fits within your target. A colored badge shows the result: green means target met, blue means already small enough, red means the best achievable size.
- Download files individually or use "Download ZIP" when 3 or more are done.
Frequently Asked Questions
Not always. A very large, highly detailed photograph may not reach a very small target without severe quality loss. In that case the tool returns the smallest achievable size and shows a red badge. For flat graphics, logos, and icons it almost always works - especially if you run the file through our PNG to 8-Bit converter first.
The tool always uses the highest quality that still fits within your target, so quality loss is minimized. For images with limited colors (logos, icons, graphics) you may not notice any difference. For photographs with complex gradients, some banding or softness may appear at aggressive compression levels.
Yes. The output is always a PNG, so alpha transparency is fully preserved. This makes it ideal for logos, icons, and any graphic that needs a transparent background after compression.
If your image is already within the target size, the tool applies a light optimization pass to strip unnecessary metadata and returns a clean file. A blue "Already under..." badge appears on the result card.
Yes - type any KB value in the custom field next to the presets. The target is locked in at upload time, so you can process different files to different sizes in the same session by changing the target between drops.
Yes - drop up to 20 PNG files at once. Each file is processed in parallel and a result card appears as each one finishes. When 3 or more files are done, a "Download ZIP" button appears so you can grab them all in one click.
Platforms like Twitter, LinkedIn, and many forums enforce a 100 KB limit on profile images, post thumbnails, and inline graphics to keep page load times fast for all users worldwide. Uploading a larger file often results in the platform re-compressing it automatically - with unpredictable quality results. Compressing to 100 KB yourself gives you full control.
For logos, icons, and flat graphics, yes - the file size says nothing about resolution. A 100 KB PNG can still be 2x or 3x resolution. For photographs, you may need to trade some detail. Using our PNG to 8-Bit converter before compressing often lets you reach 100 KB with far less visible quality loss.