Image Resizer

Resize images online for free. No upload needed — everything stays in your browser.

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Drop your image here or click to browse

Supports JPEG, PNG, GIF, WebP, BMP, SVG

Preview
Original Size
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Original Width
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Original Height
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File Type
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✨ AI-Powered Tip

For web optimization: Resize images to the maximum display size needed. A 4000px image displayed at 800px wastes bandwidth and slows page load. Modern browsers support WebP format, which is 25-35% smaller than JPEG at similar quality.

For social media: Instagram posts work best at 1080x1080 (square) or 1080x1350 (portrait). Twitter/X recommends 1200x675. Facebook cover photos should be 820x312.

For print: Use 300 DPI. A 4x6 inch photo at 300 DPI needs 1200x1800 pixels. Larger prints need proportionally more pixels.

Pro tip: When reducing image size, the quality slider matters less — even 80% quality looks great at smaller dimensions. Focus on getting the dimensions right first.

How to Resize an Image

  1. Upload your image by clicking the drop zone or dragging and dropping a file. Supports JPEG, PNG, GIF, WebP, BMP, and SVG.
  2. Set the new dimensions by entering width and/or height in pixels. With “Maintain Aspect Ratio” checked, changing one dimension automatically adjusts the other.
  3. Choose an output format — Keep Original preserves the input format, or select JPEG, PNG, or WebP. WebP offers the best compression.
  4. Adjust quality (for JPEG/WebP) using the slider. 92% is a great default — visually identical to 100% but much smaller.
  5. Click Resize Image to process. Preview the result, check the file size reduction, then click Download.

Image Format Guide

FormatBest ForTransparencyCompression
JPEGPhotos, continuous-tone imagesNoLossy, adjustable
PNGLogos, graphics, screenshotsYesLossless, larger files
WebPBoth photos and graphicsYesBest quality/size ratio
GIFSimple animationsYes (1-bit)Limited to 256 colors

Common Social Media Image Sizes

PlatformProfile PhotoPost / FeedCover / Banner
Instagram320x3201080x1080 / 1080x1350-
Facebook170x1701200x630820x312
Twitter / X400x4001200x6751500x500
LinkedIn400x4001200x6271584x396
WhatsApp DP640x640--
YouTube800x8001280x720 (thumbnail)2560x1440

Frequently Asked Questions

Is there a file size limit for resizing?

Processing happens entirely in your browser. Very large files (50MB+) may be slow depending on your device, but there is no server-imposed limit. For best performance, keep images under 20MB.

Will resizing reduce image quality?

Reducing image size maintains excellent quality. Enlarging images beyond their original dimensions will reduce sharpness. Use WebP format for the best quality-to-size ratio — it is 25-35% smaller than JPEG at similar quality.

What output format should I choose?

JPEG is best for photos. PNG is ideal for graphics with transparency. WebP offers the best compression for both, producing 25-35% smaller files than JPEG.

Are my images uploaded to a server?

No. All image processing happens locally in your browser using the Canvas API. Your images never leave your device.

Can I resize multiple images at once?

Currently this tool processes one image at a time. For batch resizing, you can resize each image sequentially. The tool is fast since all processing happens locally.

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