Image Compressor: Reduce Image File Size Free
Make JPG, PNG and WebP images smaller in seconds. Choose the quality, optionally resize, compare the before and after size, and download. Your images never leave your device.
100% private: files are processed by your browser. Nothing is uploaded to GrowthPi or anyone else.
How to use the Image Compressor
- 1
Add the images you want to compress.
- 2
Pick a quality level, an output format and an optional maximum width.
- 3
Click Compress, check the savings and download your smaller images.
Why compress images?
Large images slow down websites, fill up storage, bounce back from email and fail upload limits on forms and marketplaces. A photo straight from a phone camera is often 3 to 8 MB, while a version that looks the same on screen can be 200 to 500 KB. Compressing images makes them faster to send, upload and load.
Smaller images also help your website: page speed is part of a good user experience, and faster pages can help with search rankings and conversions.
How this image compressor works
The compressor runs entirely in your browser. It re-encodes each image at the quality you choose and can scale it down to a maximum width. You see the original size, the new size and the percentage saved before you download. Your images are never uploaded.
- Batch compress many images at once.
- Quality slider from maximum compression to near-original.
- Resize large photos to a maximum width, such as 1920 or 1200 pixels.
- Convert while compressing: save as JPG, WebP or keep the original format.
- ZIP download for all compressed images.
Recommended settings
| Goal | Format | Quality | Max width |
|---|---|---|---|
| Website photos | WebP or JPG | 75–80% | 1600–1920 px |
| Email attachments | JPG | 70–75% | 1600 px |
| Social media | JPG | 85% | 2048 px |
| Online forms with size limits | JPG | 60–70% | 1200 px |
| Printing | JPG | 90–95% | Original |
Resizing saves the most space. Halving the width of a photo cuts the number of pixels by three quarters, so a resized image is often much smaller than one compressed at high quality.
Lossy vs. lossless compression
- Lossy (JPG, WebP): removes detail the eye barely notices. Huge savings, ideal for photos.
- Lossless (PNG): keeps every pixel exactly. Best for screenshots, logos and text, but savings are smaller.
PNG files are re-saved by your browser and may not shrink much. For photos saved as PNG, converting to JPG or WebP usually gives the biggest reduction.
Tips
- Keep your original files; compressed copies cannot regain lost detail.
- Use WebP for websites, because modern browsers support it and files are smaller.
- Converting iPhone photos? Use the HEIC to JPG converter first.
- Making a PDF from photos? Compress first, then use JPG to PDF for a smaller document.
Last updated November 2, 2026.
Image Compressor FAQ
How can I reduce the size of an image?
Add your image to the compressor above, choose a quality between 70 and 85 percent and, if it is a large photo, a maximum width. Click Compress and download the smaller file.
Does compressing reduce image quality?
Lossy compression removes some detail, but at 75 to 85 percent quality most people cannot see a difference on screen.
Are my images uploaded?
No. Compression happens in your browser, so your images never leave your device.
What is the best format for small images?
WebP usually gives the smallest files for photos, followed by JPG. PNG is best for graphics and screenshots but produces larger files for photos.
Can I compress many images at once?
Yes. Add as many images as you want and download all the compressed files as a ZIP.
Why did my PNG not get smaller?
PNG is lossless, so re-saving it rarely saves much. Convert photos to JPG or WebP, or resize them, for a bigger reduction.