Browser-native processing
The image is decoded and re-encoded on your device. It does not need to travel to our compression server first.
Browser-native image compression
Compress images.
Zero uploads.
Resize, compress and convert images inside your browser. Your image data is not sent to our server for compression.
Local processingNo accountBatch-readyWebP · AVIF · JPEG · PNG
Drop images here or click to browse
Process multiple images on this device. Your browser sets the practical memory limit.
JPEGPNGWebPAVIFGIFBMP
Compressing...0%
01Local processing
Image data stays in your browser during compression.
02Batch workflow
Work through multiple files together instead of one at a time.
03Modern output
WebP, AVIF, JPEG or PNG from the same source image.
04No account
Open the tool and use it. There is no sign-up step.
See the trade-off
Smaller doesn't have to mean guessing.
Compression is a balance between bytes, dimensions and visual quality. The tool keeps the controls and the result in the same workflow so you can make that decision deliberately.
01Start from the original. Resize and encode in one pass instead of repeatedly recompressing an output.
02Inspect the result. See the output size and, when enabled, compare before and after.
03Choose the right format. Switch between modern and compatibility-focused formats without leaving the tool.
EXAMPLE RESULTresults vary by image
ORIGINAL3.8 MB4032 × 3024 · JPEG
OUTPUT486 KB1600 × 1200 · WebP
QUALITY82
EXAMPLE REDUCTION87%
METADATAstripped
One workspace
Built for the way images actually get optimized.
The goal isn't simply to make a file smaller. It's to get the right dimensions, format and quality without adding unnecessary steps.
Batch + ZIP
Process multiple images, download files individually, or package completed outputs together.
Resize + convert
Change pixel dimensions and output format as part of the same operation from the original source.
Format advice
Useful warnings and guidance when transparency or format choice deserves attention.
Before / after
Compare the source and result when you want a visual check before downloading.
Privacy by architecture
0
image files sent to our server for compression
Your files don't need our server.
reduceimagesizefree uses browser APIs to read, resize and re-encode the image locally. That is different from uploading the source file to a remote compression service.
Strip EXIF is on by defaultNo account requiredClosing the tab clears the working session
01Choose imagelocal file
↓
02Decodebrowser memory
↓
03Resize · compress · convertcanvas / browser encoder
↓
04Downloadnew local file
OUR SERVERimage datadoesn't go here
Built for real workflows
One tool. Three common jobs.
Prepare export batches without handing source files to another processing server.
Compress a batch →Resize and compress oversized photography before it enters the Media Library.
Read the WordPress guide →Compare modern formats and file-size trade-offs while keeping the source workflow simple.
Compare image formats →From the Journal
Learn how images actually work.
Definitive guides on compression, web formats, performance and image search—not random blog posts.
01 / GUIDE
Image Compression: The Complete Guide
Learn how image compression works, when to resize or change format, and how to make images smaller without unnecessary quality loss.
Read guide →
02 / GUIDE
Best Image Format for the Web
Compare JPEG, PNG, WebP and AVIF for photos, transparency, quality, browser support and file size—and choose the right format for each job.
Read guide →
03 / GUIDE
Image SEO: The Complete Guide
Make images easier for search engines and users to understand with crawlable HTML, useful alt text, relevant context, descriptive filenames and fast delivery.
Read guide →Different by design
A browser-native workflow, not an upload queue.
Both models can compress an image. The difference is where the source file is processed and how many steps the workflow requires.
WorkflowServer-based modelreduceimagesizefree
Source image processingUpload to remote serviceInside your browser
Resize + convertDepends on the toolSame workflow
Batch handlingDepends on provider limitsMultiple local files
AccountMay be requiredNot required
Questions
The useful answers.
Are my image files uploaded?+
The image data used for compression is processed in your browser rather than being sent to our server for the compression operation.
Can I compress multiple images at once?+
Yes. Add multiple supported images, process the batch, then download completed files individually or together as a ZIP. Your device and browser memory set the practical batch limit.
Can I resize and compress together?+
Yes. Open Advanced options, enter target dimensions, choose the output format and quality, then the tool creates the resized/compressed output from the source image.
Which output format should I choose?+
WebP is a practical default for many web images. AVIF can be useful when supported by your workflow, JPEG remains broadly compatible, and PNG is useful when you need lossless raster output or transparency.
What does Strip EXIF do?+
Re-encoding through the browser creates a new output without carrying common EXIF metadata from the source, which can include camera, timestamp or location fields.
Do I need an account?+
No. The compressor is designed to be opened and used without registration.
Your images.
Your browser.
Choose the files, choose the output, and make the trade-off yourself.
Compress images →