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Compress Images Online Free
Reduce the file size of JPG, PNG and WebP images without sending them to our servers. Choose a sensible maximum size, compare the result and download the optimized image directly from your browser.
Drop your image here
Or choose an image from your device
JPG, PNG and WEBP supported
Photo dimensions & file-size quick reference
Dimensions are width × height in pixels. Suggested file sizes are compression targets, not platform limits.
| Destination | Dimensions / ratio | Export | File size / limit |
|---|---|---|---|
| Etsy listing photo | 2000 × 2000 px or larger on both sidesSquare or landscape; leave room for thumbnail crops | JPG / PNG | Aim for 1 MB or lessUpload guidance, not a hard maximum: Etsy warns that larger files may fail on slow connections. |
| Instagram feed photo | 1080 × 1080 or 1080 × 1350 px1:1 square / 4:5 portrait · practical export sizes | JPG | Suggested target: 1–2 MBResizeFox target, not an Instagram upload limit. Other supported ratios may also work. |
| Facebook feed photo | 1080 × 1080 px1:1 square · practical export size, not a required size | JPG / PNG | Suggested target: 1–2 MBResizeFox target, not a Facebook upload limit. Check the specific post or ad uploader. |
| Instagram / Facebook Story or TikTok artwork | 1080 × 1920 px9:16 vertical · suggested image canvas | JPG / PNG | Suggested target: 1–2 MBImage preparation only; video limits do not apply here. Confirm the limit in your chosen uploader. |
| Pinterest standard image ad | 1000 × 1500 px2:3 · Pinterest recommendation | JPG / PNG | Maximum: 20 MB desktop / 32 MB in appFor standard image ads created through Pinterest’s business tools. |
Need another shape? Crop first, then resize and compress. Keep your original; do not sacrifice detail just to reach a suggested target. JPG is usually suitable for photos. Etsy does not preserve PNG transparency.
Sources and scope · Etsy/Pinterest checked September 19, 2026
Etsy and Pinterest guidance was checked on this date. Instagram, Facebook and vertical-canvas entries are practical ResizeFox suggestions, not a complete list of accepted dimensions or verified maximum file sizes. Check the destination’s uploader for its current limit: posting apps, advertising tools and APIs may have different requirements.
Three simple steps
How to Compress an Image Online
Choose an image
Upload a JPG, PNG or WebP file from your device.
Set the output
Choose a format and a maximum file-size target that suits where the image will be used.
Review and download
Compare the original and compressed sizes, check the preview and download the result.
What Image Compression Does
Image compression reduces the amount of data needed to store a picture. Depending on the format, it can simplify color information, encode repeated patterns more efficiently or discard detail that is difficult to notice at normal viewing size. The goal is not simply to make a number smaller: it is to create a file that remains clear enough for its intended use while taking less space and transferring faster.
JPG vs PNG vs WebP Compression
JPG
Usually the practical choice for photographs. JPG can become much smaller as quality is reduced, but repeated compression can introduce blockiness around edges and fine detail. For a photo-focused workflow with JPG input and output, use the dedicated JPG compressor.
PNG
Useful for graphics, screenshots and transparency. Detailed photographic PNG files can remain large, so converting to JPG or WebP may be more effective when transparency is not required.
WebP
A modern option for photos and web graphics. WebP often keeps comparable visual quality at a smaller size, although the result still depends on the source image and selected quality.
How to Reduce File Size Without Ruining Quality
- Start with the final use. A thumbnail, application photo and full-width website image do not need the same dimensions or quality.
- Avoid an unnecessarily tiny target. Give detailed photographs more room than simple icons or flat graphics.
- Choose the right format. JPG works well for photos, PNG protects sharp graphics and transparency, and WebP can be efficient for web use.
- Inspect the preview. Look closely at faces, text, gradients and detailed edges before downloading.
- Keep the original file. Work from the original when trying another target instead of repeatedly compressing an already compressed result.
When to Resize an Image
Resize when the pixel dimensions are larger than the destination needs. A camera photo several thousand pixels wide wastes space when it will only appear as a small profile image or email preview.
When to Compress an Image
Compress when the dimensions are already appropriate but the file remains too heavy. Compression changes how image data is stored and can reduce size without changing width and height. If stronger reduction is needed, lower the width and height before compressing again.
Common Reasons Images Are Too Large
Preparing photos specifically as attachments? The email image preparation guide explains combined attachment sizes, dimensions and format choices.
Privacy by design
Browser-Based Image Processing
ResizeFox performs the compression work inside your browser using local image and canvas capabilities. The image you choose does not need to be uploaded to ResizeFox servers, which is especially useful for personal photos, application images and unpublished work.
Need a Specific Maximum File Size?
Use a focused ResizeFox tool when a form or website gives you a specific upload limit. Results aim to stay at or below the selected target, but the exact size depends on the image.
FAQ
Image Compression Questions
Which image formats can I compress?
ResizeFox accepts JPG, PNG and WebP images. You can save the compressed result as JPG, PNG or WebP, depending on the balance of file size, image detail and transparency you need.
Will compressing an image reduce its quality?
Compression can remove some image detail, especially at very small file-size targets. Start with a realistic target and compare the preview with the original. If the result looks soft or blocky, use a larger target or reduce the dimensions before applying heavy compression.
Does ResizeFox upload my image?
No. The compression work happens locally in your browser. Your image does not need to be uploaded to ResizeFox servers for processing.
Should I resize or compress my image?
Resize when the pixel dimensions are larger than the place where the image will appear. Compress when the dimensions are already suitable but the file still contains more data than you need. For the biggest reduction, resizing first and then compressing often works best.
Can every image reach the same file size?
No. Photographs with fine detail, noise or many colors usually need more data than simple graphics. Reaching a very small target may require smaller dimensions or a more efficient output format, and the final size can vary by image.
Compare detail before you choose a format
Changing dimensions removes pixels; changing compression alters their encoding. Test these separately with small text, colored edges and smooth gradients in our Image Compression Lab. Download the results and inspect them at normal viewing size before preparing your final image.