Resize any image online, free
Drop an image, pick a width or height, and download the resized version. Runs entirely in your browser, your photo never leaves your device.
About the image resizer
Image resizing is the most-searched image utility on the web. People resize for email attachments, web upload limits, printing dimensions, social media profile photos, blog thumbnails, and a hundred other reasons. Most online resizers force you to upload to their server, sit through ads, fight pop-ups, and accept a watermark on the output. Renza's resizer is the opposite: drag-and-drop, instant, fully client-side (the image never leaves your browser), no signup, no watermark, no ads. Built on the Canvas API so it works in every modern browser. Output is high-quality and supports JPEG, PNG, and WebP formats. There is no upload limit because there is no upload, the resize happens locally.
How it works
Drop your image
Drag and drop or click to browse. The file stays in your browser, nothing is uploaded anywhere.
Adjust the settings
Pick the options you need. The preview updates instantly so you see exactly what you will get.
Download
One click and the result saves to your device. Free, no watermark, no signup.
Tips for best results
Things that meaningfully improve the output.
Keep aspect ratio
Lock the aspect ratio toggle to avoid distortion. Only enter one dimension and the other fills in automatically.
For email or messaging
Most platforms limit to ~1MB. 1600px on the longest side at JPEG quality 80 usually lands well under that.
For print
Aim for 300 DPI. A 4×6 print needs 1200×1800px. A 8×10 print needs 2400×3000px.
For social media profiles
Instagram/X profile is 400×400. Facebook is 170×170. LinkedIn is 400×400. Square crop helps.
Need more than image resizer?
renza's AI tools remove backgrounds, erase objects, restore old photos and upscale to print quality. Free credits at signup, no credit card.
Create free account →Frequently asked questions
Does the image get uploaded anywhere?
No. The entire resize happens in your browser using the Canvas API. The file never leaves your device.
Is there a size limit?
No upload limit. Practical limit is what your browser can hold in memory, typically up to 50MB images work fine.
What formats are supported?
Input: any browser-supported format (JPEG, PNG, WebP, GIF, AVIF). Output: JPEG, PNG, or WebP.
Will it work on mobile?
Yes. Works on iOS Safari and Android Chrome same as desktop.
Is there a watermark?
No watermarks ever. Renza never adds anything to your output.