❓ Frequently Asked Questions – Image Resizer
Is my image uploaded to a server?
No. This Image Resizer works entirely in your browser using the HTML5 Canvas API. Your image is never uploaded to any server. All processing happens locally on your device, so your photos remain 100% private and secure. This also means the tool works even without a stable internet connection after the page loads.
What is the difference between resizing by pixels and percentage?
Pixels mode lets you specify exact output dimensions in pixels — useful when you need a specific size like 1920×1080 or 400×400. Percentage mode scales the image by a factor — 50% makes it half the size, 200% doubles it. Percentage is useful when you want to scale proportionally without worrying about exact numbers. Both modes can lock the aspect ratio.
What does locking the aspect ratio do?
When aspect ratio is locked (🔗 linked), changing the width automatically updates the height to maintain the original proportions, and vice versa. This prevents your image from looking stretched or squished. To set a specific width and height independently (like changing a photo to a square), unlock the aspect ratio first by clicking the 🔗 button.
Which output format should I choose?
Choose JPG for photos and images where file size matters — it gives the smallest files. Choose PNG when you need transparency (like logos on a transparent background) or when image quality must be perfect (no compression artifacts). Choose WebP for web use — it gives 25-35% smaller files than JPG at the same quality and supports transparency like PNG. WebP is supported by all modern browsers.
What is the maximum image size I can resize?
The tool supports images up to 20MB and can resize to dimensions up to 9999×9999 pixels. Very large images may take a moment to process depending on your device. For extremely large files (above 10MB), consider using the Image Compressor tool first to reduce the file size before resizing.