Resize Image
Set exact dimensions or scale by percentage. Lock aspect ratio to avoid distortion. Download instantly.
Drop an image here, or click to browse
JPG, PNG, WebP, GIF · up to 50 MB
How to use Resize Image
Resize images to exact pixel dimensions or by percentage, directly in your browser with no server upload. Maintain aspect ratio automatically, or enter custom width and height. Perfect for resizing photos for social media, email attachments, web uploads, or print specifications. Supports JPEG, PNG, WebP, and GIF.
- Upload one or more images by clicking or dragging to the tool.
- Enter the target width and/or height in pixels, or a percentage reduction.
- Toggle "Maintain aspect ratio" to prevent distortion.
- Select the output format and quality if applicable.
- Download the resized image(s) immediately.
Your data never leaves your device — 100% private processing.
Pixel dimensions vs. percentage resizing
Pixel-dimension resizing creates an image at an exact size — useful when a platform specifies maximum dimensions (e.g., Twitter profile photo: 400×400 px, Instagram square: 1080×1080 px). Percentage resizing scales the image proportionally — useful when you need "half size" or "quarter size" for thumbnails without knowing the original dimensions. Mixing width-only or height-only entry with locked aspect ratio is the most common mode: enter 800 px width and the height adjusts to preserve proportions.
| Platform | Recommended image size |
|---|---|
| Twitter profile | 400×400 px |
| Facebook cover | 820×312 px |
| Instagram post | 1080×1080 px |
| LinkedIn cover | 1584×396 px |
| YouTube thumbnail | 1280×720 px |
Resampling algorithms
Resizing involves resampling — computing new pixel values for the output dimensions. Bicubic interpolation (the default) produces the best quality for both upscaling and downscaling by considering the 4×4 neighborhood of each pixel. Bilinear is faster but slightly less sharp. Nearest-neighbor preserves hard pixel edges, ideal for pixel art. Downscaling (making smaller) always produces better results than upscaling (making larger), which introduces blurring. For significant upscaling, an AI-based upscaling tool produces superior results.
Glossary
- Aspect ratio
- The proportional relationship between an image's width and height, expressed as W:H (e.g., 16:9, 1:1).
- Bicubic interpolation
- A high-quality resampling algorithm that considers 16 neighboring pixels when computing new pixel values during resize.
- Resolution (PPI)
- Pixels per inch — relevant for print output but not for digital display, where only pixel dimensions matter.
- Pixel
- The smallest addressable element in a digital image — a single point of color information.
Related reading
Frequently Asked Questions
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Why use Resize Image?
- Lossless and lossy compression options to balance quality vs file size
- Supports all major formats: JPEG, PNG, WebP, AVIF, GIF
- Batch operations keep filenames and folder structure intact
- Runs client-side — no image data ever leaves your device
Common use cases
- Resize product photos before uploading to an online store
- Compress images to pass file-size limits on job application portals
- Convert PNG screenshots to WebP for faster web pages
- Create thumbnails for YouTube or social media posts
- Remove backgrounds from profile photos
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