Image Resizer & Compressor Online – Resize, Compress & Convert Images Free
Image Resizer & Compressor Online
Resize, compress, crop and convert JPG, PNG and WebP images directly in your browser — free, fast and completely private.
1. Your Image
2. Resize
3. Compression & Format
Note: PNG is a lossless format, so the quality slider mainly affects JPG and WebP output. PNG file size instead depends mainly on image dimensions and detail.
4. Crop (Optional)
Drag the green box to move it and use the corner handle to resize. The crop applies before resizing when you process the image.
Result
Original
Size: —
Processed
Size: —
What Is an Image Resizer & Compressor?
An image resizer and compressor is a tool that changes the pixel dimensions of a photo and reduces its file size, without needing photo-editing software. This one runs entirely inside your browser using the HTML Canvas API, so the picture you upload is drawn, scaled, cropped and re-encoded on your own device — nothing is sent anywhere. That matters if you're working with personal photos, product images, or client files you'd rather not upload to a stranger's server.
You can use it to shrink a phone photo before emailing it, prepare a banner image at an exact pixel size, convert between JPG, PNG and WebP, or squeeze a large screenshot down for a faster-loading web page.
Why Resize or Compress an Image?
Large, unoptimized images are one of the most common reasons web pages load slowly. A photo straight out of a modern phone camera can easily be 4–12 MB, while most websites only need something in the range of 100–500 KB to look sharp on screen. Resizing brings the pixel dimensions down to what's actually needed, and compression reduces the amount of data used to store that image without a dramatic drop in visible quality.
- Faster page loading and better Core Web Vitals scores
- Smaller email attachments and faster uploads
- Meeting exact size requirements for social media, ads, or marketplaces
- Saving device storage and bandwidth
- Converting to WebP for smaller files at similar visual quality
How to Resize an Image Online
- Upload your JPG, PNG or WebP image by dragging it into the upload area or clicking "Choose Image."
- Enter a new width or height, or pick one of the ready-made presets like 1080×1080 or 1920×1080.
- Keep "Lock aspect ratio" checked if you want the image to scale proportionally without stretching.
- Alternatively, use the percentage buttons to scale the image down to 25%, 50% or 75% of its original size.
- Click "Process Image" to generate the resized version, then compare it against the original before downloading.
How to Compress an Image
Compression is controlled by the quality slider in the "Compression & Format" section. Dragging it left produces a smaller file with more visible compression artifacts; dragging it right keeps more detail at the cost of a larger file. For JPG and WebP output, this quality value is passed directly to the browser's built-in encoder. PNG is lossless, so the slider has little effect on a PNG's size — if you need a much smaller PNG, try reducing the dimensions instead, or switch to JPG or WebP.
- 90–100% (High): Best for print, portfolios, or images where fine detail matters.
- 60–89% (Medium): Good balance for most websites and social posts.
- 1–59% (Low): Smallest files, useful for thumbnails or when file size is critical.
Supported Image Formats
| Format | Best For | Compression | Transparency |
|---|---|---|---|
| JPG / JPEG | Photos, complex images | Lossy, adjustable | No |
| PNG | Graphics, logos, screenshots | Lossless | Yes |
| WebP | Web use, smaller file sizes | Lossy or lossless | Yes |
Learn more about how these formats are handled in browsers from the MDN Web Docs guide to image file types.
Resize vs Compress: What's the Difference?
Resizing changes how many pixels make up the image — for example, turning a 4000×3000 photo into 1200×900. Compressing keeps the same pixel dimensions but reduces the amount of data used to describe each pixel, which is what the quality slider controls. In practice, the biggest file-size savings usually come from doing both together: resize the image down to the dimensions you actually need, then compress it at a sensible quality level.
Real Examples
| Original | Resized To | Format | Quality | Typical Result |
|---|---|---|---|---|
| 4032×3024, 5.1 MB (JPG) | 1920×1440 | JPG | 80% | ~550 KB |
| 3000×3000, 8.4 MB (PNG) | 1080×1080 | WebP | 75% | ~180 KB |
| 2400×1600, 2.2 MB (JPG) | 1200×800 | JPG | 60% | ~140 KB |
Actual results vary by image content — a busy, high-detail photo compresses differently than a simple graphic with flat colors.
Common Mistakes to Avoid
- Upscaling small images. Enlarging a low-resolution photo makes it blurry — this tool can enlarge dimensions, but it cannot add detail that isn't there.
- Ignoring aspect ratio. Typing a new width and height without locking the aspect ratio can stretch or squash your image.
- Using PNG for photos. PNG is great for logos and screenshots, but photos usually end up far smaller as JPG or WebP.
- Over-compressing. Dragging quality too low introduces visible blocky artifacts, especially around text and edges.
Limitations
Because everything runs in your browser, very large images (very high megapixel counts or dozens of megabytes) can be slow to process or may hit your device's available memory, particularly on older phones. WebP encoding support also depends on your browser — most current versions of Chrome, Edge, Firefox and Safari support it, but very old browsers may not. If a feature isn't supported, the tool will show a clear message rather than fail silently.
Frequently Asked Questions
How can I resize an image online for free?
Upload your image above, enter the width and height you need (or pick a preset), and click "Process Image." The resized file is generated instantly in your browser and is free to download.
Can I compress JPG images with this tool?
Yes. Use the compression quality slider in the "Compression & Format" section — lower values produce smaller JPG files, higher values preserve more detail.
Can I convert JPG to WebP or PNG?
Yes. Choose your desired output format from the format selector before processing, and the downloaded file will be converted and named accordingly.
Does this tool upload my images to a server?
No. All resizing, cropping and compression happens locally in your browser using the Canvas API. Your images never leave your device.
How can I reduce image size without losing too much quality?
Start by resizing to the smallest dimensions that still look good for your use case, then use a quality setting around 70–85% for JPG or WebP. This combination usually gives the best balance of size and visual quality.
Can I resize an image on my phone?
Yes. The tool is fully responsive and works on Android and iOS browsers, including drag-to-resize cropping with touch controls.
Is this image compressor completely free to use?
Yes, there is no cost, account, or sign-up required to resize, compress or convert your images.
Why is my PNG file still large after compression?
PNG is a lossless format, so the quality slider has minimal effect on it. To get a much smaller file, reduce the image dimensions or switch the output format to JPG or WebP.
What is the maximum image size this tool can handle?
There's no hard-coded limit, but very large files (over roughly 25 MB, or extremely high resolutions) may process slowly or hit memory limits depending on your device and browser.
Will cropping affect the final resized dimensions?
Yes. When cropping is enabled, the cropped area becomes the source image, which is then scaled to whatever width and height you've set in the resize section.
Related Tools
This tool is provided for general image-processing convenience. For professional print production or color-critical work, verify results with dedicated design software before final use.
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