Resize an Image Online, Free — Exact Pixels or File Size
File Tools Online · July 2026 · 5 min read
A government portal asking for a photo under 100KB, a passport application needing an exact 2×2 inch image, or simply a photo too large to upload anywhere — resizing an image to a precise target, whether in pixels or file size, is one of the single most common small tasks on the internet, and it shouldn't require an account to do.
Resizing to Exact Pixel Dimensions
This tool resizes images to fit within specified pixel dimensions using Lanczos resampling — a high-quality resizing algorithm that keeps edges and detail sharp rather than producing the soft, blurry result that basic resizing methods often leave behind.
Resizing for Passport and ID Photos
Passport, visa, and ID photo requirements are notoriously specific about exact dimensions (commonly 2×2 inches or 35×45mm depending on country), and getting this wrong is one of the most frustrating reasons an application gets bounced back. Resizing to these exact specs before submitting avoids that entirely.
Resizing to a Target File Size, Not Just Dimensions
Plenty of upload portals — job applications, government forms — cap file size in KB rather than pixels, which is a different problem than simple pixel resizing. This tool supports resizing down to a target file size like 100KB or 20KB, not just target dimensions.
How to Resize an Image Online
- Create a free account — no credit card required.
- Go to Tools → Image Tools → Image Resizer.
- Upload your image and set your target dimensions or file size.
- Download your resized image.
- Your original file is deleted from the server within 30 minutes.
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Frequently Asked Questions
How do I resize an image to exact pixel dimensions?
Upload the image and specify the target width and height — the tool resizes using Lanczos resampling to keep the result sharp.
How do I resize an image to a specific file size, like 100KB?
Set your target file size rather than pixel dimensions, and the tool adjusts compression to hit that target while keeping the image as clear as possible.
How do I make a passport or ID photo size?
Set the exact dimensions your passport or ID authority requires (commonly 2×2 inches or 35×45mm) and the tool resizes to that precise size.
Will resizing reduce image quality?
Lanczos resampling is specifically chosen to minimize quality loss when resizing, keeping edges and detail as sharp as possible at the new size.
What image formats are supported?
JPG, PNG, and WebP are all supported for resizing.