Image Resizer: Resize, Rotate & Flip Images Online
Image resizer online: resize your images by pixels or percent, rotate and flip, with quality options for JPEG and WebP output.
Updated 2026-08-16
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Features
- Resize images to exact dimensions, by pixels or percentage
- Fit, Fill, and Stretch resize modes for different scaling needs
- Rotate 90° clockwise, counter-clockwise, or 180°
- Flip horizontally or vertically
- Maintain aspect ratio option: keep proportions when changing size
- Pixel input with slider (1-500%) for quick scaling
- Output as JPEG, PNG, or WebP, defaulting to the original format
- Adjustable quality for JPEG and WebP output (10-100%)
- Real-time preview: see the result instantly as you adjust
- Paste from clipboard (Ctrl+V) for instant editing
- No file size limits on input images
How to Use
- 1Open an image by clicking the drop area, dragging a file onto it, or pasting from clipboard (Ctrl+V).
- 2Choose a resize mode: Fit (scale to fit), Fill (fill and crop), or Stretch (exact dimensions).
- 3Set target dimensions: switch between Pixels for exact size or Percentage for proportional scaling.
- 4Toggle Keep Aspect Ratio on or off. When on, changing width or height automatically adjusts the other.
- 5Apply rotation (90° clockwise, counter-clockwise, 180°) or flip (horizontal, vertical) if needed.
- 6Select output format and adjust quality for JPEG/WebP, then click Save to save the result.
- 7How to resize an image to 1920×1080 for a desktop wallpaper: open your image, select Pixels mode, enter 1920 for width and 1080 for height. Choose the Fill resize mode to crop and fill the screen completely, or Fit to keep the entire image visible with letterboxing.
- 8How to resize a product photo to a standard e-commerce size: open the product image, set width to 800 pixels and enable Keep Aspect Ratio so height adjusts automatically. Select the Fit mode to ensure the entire product is visible, then save as JPEG with 85% quality.
Frequently Asked Questions
What's the difference between pixels and percentage?
Pixels: set exact target width and height (e.g. 800×600). The output will be those exact pixel dimensions. Percentage: scale relative to original (e.g. 50% = half the width and height, 200% = double). Both modes support maintaining aspect ratio.
What's the difference between Fit, Fill, and Stretch?
Fit: scales proportionally so the entire image fits within your target dimensions; no cropping, no distortion, but may leave empty space. Fill: scales proportionally to fill the target area completely; may crop edges. Stretch: forces the image to match exact width and height; may distort if the aspect ratio differs.
Does resizing reduce image quality?
Downscaling (making smaller) usually keeps the image sharp. Upscaling (making larger) may cause pixelation since the browser must generate new pixels. For JPEG/WebP output, you can adjust quality from 10-100%. We recommend 80-90% for a good balance of size and quality.
Why can't I resize images above 16384 pixels?
The max dimension is capped at 16384 pixels to prevent browser crashes, and the practical limit also depends on your device's available memory: images up to 50MB typically work fine, while very large images (100MB+) may cause performance issues on lower-end devices.
What image formats are supported?
The tool accepts JPG/JPEG, PNG, WebP, AVIF, BMP, GIF, and SVG as input (any format the browser can render). Output can be saved as JPEG, PNG, or WebP. SVG input will be rasterized (converted to pixels) during resizing.
Does rotation or flip affect image quality?
Rotating by 90°, 180°, or 270° and horizontal/vertical flips are lossless operations; they just rearrange the pixel data without re-encoding. No quality loss occurs from rotation or flip alone.
How do I resize an image to a specific file size like 100KB?
There is no target-size mode; combine pixel dimensions and quality instead. For a 100KB target, try 800–1200 px on the long side at 70–80% JPEG quality, check the preview's estimated size, and adjust. Photos hit targets easily; PNG with transparency or flat-color graphics usually need a format switch to JPEG or WebP.
Can I resize an image in centimeters?
Centimeters are a physical unit tied to print DPI, so the tool works in pixels. Convert for print first: at 300 DPI, 5 cm is about 591 pixels; at 150 DPI, about 295. Enter the pixel values in the width/height fields and choose Fit mode to keep the full image visible.
Can I resize multiple images at once?
No, this tool processes one image at a time. For batch resizing, each image needs to be processed individually since dimensions and aspect ratios vary. The real-time preview helps you verify the result before saving.
What happens when I upscale an image beyond its original size?
Upscaling (enlarging) an image causes the browser to generate new pixels through interpolation. The result may appear soft or pixelated, especially at high scaling percentages. For the best quality, avoid upscaling beyond 200% of the original dimensions.
Why does my image get blurry after resizing?
Enlarging an image always reduces sharpness because new pixels must be interpolated. For downscaling, blur usually comes from saving at a low quality setting; increase the output quality, or resize in steps. Starting from a high-resolution original gives the best result.
Why does resizing lose image quality permanently?
Downscaling usually looks as sharp or sharper, but the detail removed by resampling is permanently discarded; the file cannot recover it. Upscaling can never recreate detail that does not exist in the source. To keep maximum quality, always resize from the original file rather than an already-compressed copy, since every re-encode compounds quality loss.
Why is my resized image still too large in KB?
Resizing only changes dimensions; the KB size of a photo also depends on compression. A 4000x3000 JPEG resized to 1920px wide at 90% quality can still be 1-2MB; lower the JPEG/WebP quality to 60-70%, or pick smaller dimensions. Text-heavy screenshots compress poorly in JPEG; switch the output to WebP. Use the preview's estimated size and iterate until you hit the target.
Why does this image resizer online stretch my image out of shape?
You are using Stretch mode; it forces the exact target width and height, so when the aspect ratio differs, the picture gets squashed or stretched. Switch to Fit (letterboxing) or Fill (crops edges) to keep proportions, or enable Keep Aspect Ratio with pixel input so the other dimension adjusts automatically. The preview shows all three modes live, so you can compare before saving.