01
Choose your image
Drop a JPG, PNG or WebP into the box. Everything stays on your device.
SMALLER FILES. BIGGER POSSIBILITIES.
Compress Image to 300KB
A smaller file for detailed document scans and portfolio thumbnails. Choose your image; 300 KB is already selected.
Free to useNo uploadsNo sign-up
YOUR EVERYDAY IMAGE COMPRESSOR100% on-device
Drop your image here
A little smaller. Just as beautiful.
or drag & drop a fileJPG, PNG & WebP • Maximum 20 MB • Processed securely in your browser
Your images never leave your device. Compression happens directly inside your browser.
Private by designMade for your browserWorks on any device
LESS WORK. LIGHTER IMAGES.
A little smaller in three simple steps.
From “file too large” to ready to go.
02
Pick your perfect size
Choose a target in KB or a compression preset. We’ll handle the calculations.
03
Download & carry on
Preview your lighter image, check the details and save it straight to your device.
A USEFUL LITTLE GUIDE
Getting a useful image under 300 KB
From 100 to 300 KB, most medium-resolution photos fit without visible artifacts. Large phone photos still need resizing, but the result stays sharp enough for web pages, listings and document uploads.
A 300 KB budget holds roughly a 1,520 × 1,010 px JPG photo or a 1,810 × 1,210 px WebP photo at good quality. The compressor searches for the highest JPG or WebP quality that fits within 307,200 bytes. If quality alone is insufficient, it reduces dimensions in 15% steps while keeping the aspect ratio. PNG conversion always requires your choice.
THE NUMBERS
Quick reference for this page
| Byte ceiling used by Shrinker | 307,200 bytes (300 × 1,024) |
|---|---|
| If the site means 1 KB = 1,000 bytes | 300,000 bytes — enter 292 KB for a safe margin |
| Typical JPG photo that fits | about 1,520 × 1,010 px (1.5 MP) |
| Typical WebP photo that fits | about 1,810 × 1,210 px (2.2 MP) |
| Typical PNG photo that fits | about 540 × 360 px (0.19 MP) |
| 12 MP phone photo (4000 × 3000) | likely needs resizing to around 1,520 px wide |
Size estimates assume a typical photograph at good quality. Detailed or noisy images need more bytes; flat graphics need fewer.
YOUR FILES. YOUR BUSINESS.
Small files.
A big commitment to privacy.
Your photos hold moments, memories and sometimes sensitive details. That’s why compression happens on your device. Your images are not uploaded to our servers.
How we protect your privacyBEHIND THE SMALLER FILE
How image compression works.
Not every image needs every byte. For JPG and WebP, we search for a quality level that fits your chosen size. If that’s not enough, we gradually reduce the dimensions, keeping the original proportions.
PNG works differently: its browser encoding is lossless. If your target needs a format change, you make that choice. You can always compare the preview and check the final size before downloading.
GOOD TO KNOW
A few little answers.
Everything you need to make
your next image a little lighter.
Should I use JPG or WebP for a 300 KB limit?
Use JPG when the destination only lists JPG/JPEG. If WebP is accepted, it usually keeps more detail at the same size—roughly 1810 × 1210 px of photo fits in 300 KB as WebP.
Are my images uploaded?
No. Compression happens directly inside your browser on shrinker.app. Your images are not uploaded to our servers. Selecting, previewing and downloading use local files and browser Blob URLs.
How do I compress an image to a specific KB size?
Choose a preset or enter a custom size, then select Compress Image. For JPG and WebP, the tool searches quality settings and reduces dimensions if necessary. Check the result size before submitting it elsewhere. One KB in this tool equals 1,024 bytes.
Does compression reduce image quality?
JPG and WebP compression can lose detail. The tool tries to retain the highest quality that meets your target at each resolution. PNG encoding is lossless, although resizing a PNG still removes pixel detail. Always check the preview.
Why is my PNG still larger than the target?
Canvas doesn't expose a lossy quality control for PNG. If lossless re-encoding can't reach your limit, choose an explicit conversion to WebP or JPG, or try larger target settings. WebP can preserve transparency; JPG uses a white background.
Can I use this on my phone?
Yes. Use a current browser, choose a JPG, PNG or WebP image under 20 MB, and save the result to your device. Images above 40 megapixels or 16,384 pixels on either side are rejected to limit memory use.
Is it free? Do I need an account?
Shrinker is free and doesn't require an account. There are no paid APIs or upload quotas. Advertisement spaces are reserved for future use; no advertising provider is currently connected.