Image Compressor
Compress images in your browser. JPEG, PNG and WebP support.
The JPEG format was created in 1992. The "J" stands for Joint — as in Joint Photographic Experts Group, not the JS ecosystem!
How to use the Image Compressor
Drop or browse for a JPG, PNG, or WebP image. Adjust the quality slider (lower = smaller file, higher = better quality), set a max width to resize large images, and choose your output format. Click Compress to process the image entirely in your browser. Preview the original vs compressed side by side, see the exact file size savings, and download in one click.
Step-by-step guide
- 1 Upload image
Drag and drop a JPG, PNG, or WebP image onto the drop zone, or click Browse Files to select one.
- 2 Adjust settings
Set the quality slider (80% is a good default), optionally set a max width, and choose your output format.
- 3 Click Compress
Press ⚡ Compress to process the image in your browser. Compare the before/after previews.
- 4 Download
Click ⬇ Download to save the compressed image to your device.
What can you do with this tool?
- Optimize images for faster website and landing page loading
- Reduce image file size before uploading to a CMS or blog
- Convert PNG screenshots to smaller JPEG or WebP format
- Batch-prepare product images for e-commerce stores
- Shrink images before attaching to emails
- Resize and compress hero images for better Core Web Vitals scores
Why use STB's Image Compressor?
STB's Image Compressor is completely free — no account, no email, no credit card. It runs entirely in your browser so your data never leaves your device. Whether you're a developer, student, or just someone who needs a quick image compressor, open this tool and get results in seconds. No ads, no rate limits, no paywalls — just a fast, clean tool from Software That Benefits, a studio dedicated to free tools for developers and students.
Frequently Asked Questions
Does compressing an image reduce its visual quality?
It depends on the compression level. JPEG is a lossy format — reducing quality below 70–75% usually produces visible artifacts. PNG is lossless, so compression reduces file size without affecting pixels. WebP offers better compression than both at equivalent visual quality. Use the quality slider and preview to find the right balance.
Is my image uploaded to your servers?
No. Image compression runs entirely in your browser using the HTML5 Canvas API. Your image files are never sent to any server — they stay on your device throughout the entire process.
What is the maximum file size this tool supports?
There is no hard server limit because no upload occurs. The practical limit depends on your device's available memory. Images up to 20–30MB are handled comfortably on most modern devices.
Which format should I choose — JPEG, PNG, or WebP?
Use JPEG for photographs and complex images. Use PNG for graphics, screenshots, and images with transparency. Use WebP for web use where you want the smallest file size — it offers superior compression over both JPEG and PNG and is supported by all modern browsers.
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