Image Resizer - Resize, Compress and Convert Images Online: Free, Private & No Sign-Up.
ResizeImage.io is a free online image resizer, photo compressor, and format converter that runs entirely in your browser - your pictures never upload to any server. Resize one image or hundreds in bulk, set exact pixel, cm, mm, or inch dimensions with DPI control, hit precise file sizes like 20 KB or 1 MB, and export clean, optimized JPG, PNG, WebP, TIFF, HEIC or AVIF files in seconds.
Drag & Drop Image files here
Supported Files : JPG, PNG, WEBP, TIFF.
You can also click to select files.
How to Resize and Compress Images?
Drag and drop or click to select the images you want to resize, compress, or convert. JPEG, PNG, TIFF, WebP, HEIC and AVIF are supported - one file or an entire batch.
Automatic mode smartly optimizes size and quality for you. Advanced mode lets you set exact dimensions in pixels, cm, mm, or inches, choose a quality percentage, or target a specific file size like 20 KB or 1 MB.
Preview the results, then download images individually or grab everything in one ZIP. Processing happens on your device in seconds - nothing is uploaded, so there is nothing to wait for or delete.
Why Use This Image Resizer?
Bulk-resize, compress, upscale, and convert images with best-in-class quality. Fast results, private in-browser processing, and pixel-perfect control over every photo.
Bulk Image Resizing & Compression
Resize and compress images in bulk - hundreds at a time - and download everything as a single ZIP. Lossy and lossless modes keep files small and sharp.
Resize by Pixels, CM, MM, or Inches
Set exact pixel dimensions, or work in physical units with the cm image resizer and inch image resizer - with full DPI support for print-ready output.
Compress to an Exact File Size
Need a file under a limit? Hit precise targets like 20 KB, 100 KB, or 1 MB for forms, portals, and email - or simply reduce image size in KB automatically.
Convert Between All Major Formats
Use the built-in image converter to switch between JPG, PNG, WebP and TIFF, convert iPhone HEIC photos, or modern AVIF files - no quality loss, no watermarks.
Free, Private & No Sign-Up
No login, no registration, no file-size limits, and no watermarks. Every image is processed locally in your browser and is never uploaded, so your photos stay 100% private.
Frequently Asked Questions
No. ResizeImage.io has no upload limits because there are no uploads - images are processed directly on your device, so even very large, high-resolution photos work fine. For the smoothest experience with huge files, keep other browser tabs to a minimum.
There is no fixed cap - the image compressor handles unlimited images, and bulk jobs are only limited by your device's memory. For the fastest results with large batches, run ResizeImage.io in one browser window with minimal other tabs open.
You can resize an unlimited number of images. For best performance we recommend batches of up to 20 at a time - download each batch as a ZIP, then start the next.
Yes. Enable both options in Settings and every photo is resized to your target dimensions and compressed to your target file size in a single pass - the fastest way to prepare images for uploads, forms, and submissions.
Never. All processing happens locally in your browser on your own device - your images never reach our servers, so there is nothing to store, share, or delete. That is also why the tool is fast: there is no upload or download queue.
Resize by exact pixels, by percentage, or in physical units with the cm image resizer and inch image resizer (DPI supported).There are also format-specific tools - JPG resizer, PNG resizer, WebP resizer and TIFF resizer. Popular presets include 2x2 inch passport photos, 35x45 mm ID photos, resize image to 100 KB, and resize image to 20 KB.
Yes - WebP to PNG, PNG to JPG, WebP to JPG, JPG to WebP, PNG to WebP, TIFF to JPG, TIFF to PNG, and JPG to PNG, plus HEIC and AVIF converters and file-size converters like MB to KB and KB to MB.
Automatic smart compression, quality-percentage control, and exact target sizes: 20 KB, 15 KB, 100 KB(ideal for blog and web images), 200 KB, 500 KB, 1 MB and 2 MB, plus a general reduce image size in KB tool.
Making an image smaller is safe: our resampling keeps edges sharp, and lossless compression preserves every pixel. Enlarging is where quality usually breaks down - for that, use the AI image upscaler, which reconstructs detail as it enlarges instead of simply stretching pixels.
Open the 2x2 inch photo resizer, add your photo, and it is sized to the exact US passport specification at print-ready DPI. For most other countries' ID and visa photos, use the 35x45 mm resizer, and for the DV lottery use the 600x600 pixel resizer.
Use the 1024x576 resizer for YouTube banner art, the YouTube thumbnail maker for 1280x720 thumbnails, and the 1920x1080 resizer for HD stills - each preset locks the correct aspect ratio so nothing important gets cropped.
Yes. The HEIC to JPG converter turns iPhone photos into universally supported JPGs right in your browser, and the HEIC converter can also output PNG, WebP, and TIFF. Nothing to install, and your photos are never uploaded.
Yes - it runs in any modern mobile browser, with no app to install. Very large batches or 8K upscaling are best done on a desktop, since processing uses your own device's memory.
Resizing changes the pixel dimensions of an image (for example, 4000x3000 down to 1920x1080), while compressing shrinks the file size in KB or MB without changing dimensions. You can do either - or both at once - with the pixel resizer and the image compressor.
Yes. We have a Free Private AI Background Remover(4k with no watermark) and Image Upscaler that processes everything completely locally on your device. There are no server uploads, no sign-ups required, and your images remain 100% private.