Image Resizer
Resize images online for free. Set exact dimensions, use social media presets, and download as PNG or JPEG — all in your browser.
Drop images here or click to upload
JPG, PNG, WebP — up to 50MB per file — batch upload supported
Need API access to Image Resizer?
Integrate this tool into your workflow with our REST API. 3 free requests/day, unlimited with Pro.
What is Image Resizer?
Resize any image to exact pixel dimensions instantly and for free. Upload a photo, set your target width and height (with optional aspect ratio lock), or pick from ready-made presets for Instagram, Twitter, Facebook, LinkedIn, YouTube thumbnails, and common screen resolutions. Choose output format (PNG or JPEG with adjustable quality), preview the result in real-time, and download — all processing happens client-side using the Canvas API so your images never leave your device. Supports batch resizing of multiple images at once.
AllKit's Image Resizer is completely free with no signup required. All processing happens directly in your browser — your data is never sent to any server, making it safe for sensitive information.
Why use AllKit?
- No ads, no distractions — a clean interface that lets you focus on the task
- Privacy-first — 100% client-side processing, nothing is uploaded
- Free forever — core tools are free with no usage limits
- API available — integrate into your workflow via our REST API
Frequently Asked Questions
How do I resize an image online?▾
Upload your image by dragging it into the tool or clicking to browse. Enter your desired width and height in pixels, or choose a preset size (like 1080x1080 for Instagram). Click 'Resize All' and then download the result. The entire process takes seconds and happens in your browser.
Will resizing reduce image quality?▾
Resizing to smaller dimensions generally preserves quality well. When enlarging images (upscaling), some softness may appear because the browser interpolates new pixels. For JPEG output, you can control quality with the slider — 85-95% is recommended for a good balance of quality and file size.
What image formats are supported?▾
You can upload JPEG, PNG, and WebP images up to 50MB each. For output, choose between PNG (lossless, best for graphics and screenshots) or JPEG (smaller file size, best for photos). PNG preserves transparency while JPEG does not.
Can I resize multiple images at once?▾
Yes. Upload as many images as you want — either drag them all in at once or add more with the 'Add' button. All images will be resized to the same target dimensions when you click 'Resize All'. You can then download each individually or download all at once.
What is aspect ratio lock?▾
When aspect ratio lock is enabled (the default), changing the width automatically adjusts the height to maintain the original proportions, and vice versa. This prevents your image from looking stretched or squished. Toggle it off if you need exact non-proportional dimensions.
What are the best image sizes for social media?▾
Instagram post: 1080x1080, Instagram story: 1080x1920, Twitter/X post: 1200x675, Facebook post: 1200x630, LinkedIn post: 1200x627, YouTube thumbnail: 1280x720. All of these are available as one-click presets in the tool.
Is there a file size limit?▾
Each image can be up to 50MB. There is no limit on the number of images you can resize in a single session. Since all processing happens in your browser, the only constraint is your device's available memory.
Are my images uploaded to a server?▾
No. AllKit's Image Resizer is 100% client-side. Your images are processed entirely in your browser using the HTML5 Canvas API. Nothing is uploaded, stored, or transmitted. You can even use the tool offline after the page loads.
Can I resize an image to exact pixel dimensions?▾
Yes. Enter the exact width and height you need in pixels. If you want to maintain the aspect ratio, keep the lock toggle on and only change one dimension — the other will adjust automatically. Toggle the lock off to set both dimensions independently.
What is the difference between resizing and compressing?▾
Resizing changes the pixel dimensions of an image (e.g., from 4000x3000 to 1920x1080). Compressing reduces file size without changing dimensions by adjusting encoding quality. Often you want both — resize to your target dimensions and then choose a reasonable JPEG quality. AllKit offers both an Image Resizer and a dedicated Image Compressor.