Free Online Bulk Image Resizer

Unlike standard resizers that cause heavy pixelation, ConvertFT uses advanced server-side interpolation algorithms (such as Lanczos and Bicubic resampling). When scaling images up to 1000% (10x), our C++ engine intelligently calculates new pixel data to minimize blur and preserve edge sharpness. Whether you are enlarging a logo or a high-res photo, you get a much cleaner result than browser-based scaling.

Yes. Since ConvertFT is powered by server-side processing, the heavy lifting is done on our high-performance nodes, not your device. Our engine supports massive images up to 200 million pixels and 50MB in size. You can batch-process unlimited files simultaneously without worrying about memory leaks or browser crashes, making it a reliable choice for professional photographers and designers.

By default, ConvertFT preserves the original aspect ratio to prevent your images from looking stretched or squashed. If you input only Width or Height: The other dimension is automatically scaled proportionally. If you input both: The system ensures the image fits within your specified dimensions while maintaining its integrity.Percentage Mode: You can also scale by a precise percentage (from 1% to 1000%) for uniform adjustments across a diverse batch of photos.

Absolutely. ConvertFT is a hybrid Resizer and Converter. In the settings, you can define your output format (e.g., convert HEIC or AVIF to optimized WebP or JPG). Our server-side encoder allows for fine-grained quantization, ensuring that your resized images are not only the right dimensions but also perfectly optimized for web loading speeds.

Security is our core priority. All transmissions are encrypted via 256-bit SSL. We follow a strict "Zero Human Access" policy—your files are handled exclusively by our automated engine. Files are temporarily stored in a secure cache and are permanently erased after 60 minutes. For immediate peace of mind, you can use the "Clear Immediately" button on the download page to destroy your data instantly after processing.

No. Standard resizing often results in "soft" or blurry edges. ConvertFT’s server-side engine applies adaptive anti-aliasing filters during the resampling process. This ensures that even when you downscale a 4K image to a thumbnail, or upscale a small icon by 10x, the edges remain crisp and the textures are preserved without artificial noise.

This is one of our most powerful batch features. You can upload a mix of JPG, PNG, HEIC, and AVIF files at once. ConvertFT will apply your chosen resize dimensions and uniformly export them into your preferred format (e.g., all to optimized WebP). This "one-click" workflow is designed to save hours of manual conversion and resizing for web developers and social media managers.

Absolutely. ConvertFT’s intelligent scaling engine recognizes individual image dimensions within a batch. If you set a target Width, our system will proportionally adjust each image—whether it’s a vertical portrait or a horizontal landscape—ensuring consistent output width without any distorted stretching.

When downscaling to as low as 1%, ConvertFT preserves the integrity of the Alpha channel (transparency) in PNG and WebP files. Unlike basic resizers that may add a white or black background, our server-side processing ensures your transparent logos and icons remain web-ready and perfectly crisp.

ConvertFT supports Unlimited Batch processing. While browser-based tools often freeze after 10-20 images due to memory limits, our robust server-side architecture handles hundreds of files in a single session. This makes it the go-to tool for e-commerce managers and content creators handling high-volume asset libraries.