AscendLab

Image tools

图片压缩

New free tool

Private Image Compressor with Size Comparison

Compress JPG, PNG, and WEBP images with quality, format, and optional max dimension controls. Everything runs locally so private images do not need to leave your browser.

Quick answer

An image compressor reduces file size by changing format, quality, dimensions, or a combination of all three.

This browser tool shows original size, compressed size, and file-size change before you download.

Best inputs for compression

Use large web images

Photos, screenshots, and social images often shrink well when exported as WEBP or JPG.

Choose intent before format

Use WEBP for web delivery, JPG for compatibility, and PNG when transparency or lossless output matters.

Free ToolBrowser-only processing
Image Compression Studio
Reduce file size with WEBP, JPG, or PNG export controls, optional downscaling, and before-after size feedback.

Drop image here or click to upload

Supported format: JPG / PNG / WEBP, max 15MB

No image uploaded

Compression Controls
Choose format and quality, then optionally cap dimensions for a smaller export.
1600 x 1600px
82%

Cap width and height without upscaling smaller images.

No upload compression

Compression runs locally with browser canvas. Your source image is not sent to a backend service.

Best-fit workflows
Compression is most helpful when image file size affects upload, delivery, or page speed.

Website images and blogs

Export WEBP or JPG files that are lighter for articles, landing pages, and documentation.

Marketplace uploads

Reduce large product photos before uploading to platforms that limit file size.

Email and support attachments

Compress screenshots and photos when you need smaller attachments without opening a design app.

Compression tips that help
Format and dimension choices matter as much as quality.
Try WEBP first for web images, then use JPG if the destination does not support WEBP.
Lower quality gradually. A small move from 90 to 82 can reduce size without obvious visual loss.
If the source is huge, set a max dimension before compressing. Fewer pixels usually means smaller files.
Example
Upload a 3.8 MB JPG, export WEBP at 82 percent quality, enable a 1600 px max dimension if the image is large, then download the smaller file.
Assumption
The browser can decode the source image and encode the selected output format. WEBP support depends on the browser.
Limitation
Canvas export may remove metadata, PNG may not shrink, and very low quality settings can create visible artifacts.

Suggested workflow

Compress after the image is ready

Use this path when an image needs final dimensions, smaller file size, and a quick social-size check.

Step 1
Resize dimensions
Set final width and height before compression so you do not encode extra pixels.
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Step 2
Compress export
Choose WEBP, JPG, or PNG and compare the file-size result.
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Step 3
Check social dimensions
Review Open Graph image dimensions before publishing.
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Related tools

Finish the visual asset

Image Resizer
Set final pixel dimensions before compressing the export.
Open tool
Image Crop Tool
Crop the image frame before reducing file size.
Open tool
Image Watermark Tool
Add text or logo watermarking before final compression.
Open tool
OG Image Size Checker
Check social preview dimensions after export.
Open tool
Frequently asked questions

Does this image compressor upload my file?

No. The image is decoded, compressed, and exported in your browser. The current tool does not upload the source image to a backend.

Which image formats are supported?

The tool accepts JPG, PNG, and WEBP images and can export compressed results as WEBP, JPG, or PNG.

Which format should I choose?

WEBP is often the smallest option for web use, JPG is widely compatible, and PNG is best for lossless graphics or transparency.

Why did my PNG become larger?

PNG export is lossless and browser canvas encoding may not beat the original optimizer. Try WEBP or JPG when file size is the priority.

Can I reduce dimensions while compressing?

Yes. Enable the max dimension controls to cap width and height. The tool downscales larger images and does not upscale smaller images.