Compare the original and compressed bytes for every image before you download the result.
COMPRESS JPG, PNG & WEBP IMAGES
Free Image Compressor Online
Compress JPG, PNG and WebP images in your browser, compare the original and reduced file sizes, and download one image or a ZIP batch.
Free to useNo sign-upPrivate browser processing
Image CompressorPrivate batch image processing
Ready for JPG, PNG or WebP images
Drop JPG, PNG or WebP images
Add several files to process them together. Nothing is uploaded.
INPUT QUEUE0 images · 0 B
Your batch appears here
Add one image or a complete group before choosing the settings.
LIVE PREVIEWAdd an image to start previewing
Every setting change appears automatically
Your before-and-after preview appears here
Try the sample image, then move any slider or setting to see the result immediately.
RESULTSProcess the queue to compare results
Processed previews, new dimensions and file-size comparisons appear here.
TESTED & REVIEWED
Know what this tool does—and where to double-check
- Reviewed by
- HTML Online Viewer project
- Last reviewed
- Processing
- Ordinary processing happens in this browser tab; the tool does not intentionally upload your source.
- Important limitation
- Smaller output is not guaranteed. JPEG and WebP quality controls are lossy; PNG does not use the same quality setting. No exact-KB target, OCR, SVG, HEIC or AVIF support is promised by this tool. Keep your original and compare the downloaded image.
WHY USE IT
A focused tool for reliable image work
Process several JPG, PNG or WebP files with the same settings and download the results together as a ZIP.
Canvas processing happens on your device, so ordinary image files are not uploaded to our servers.
HOW IT WORKS
Three quick steps
- 01Choose your images
Drop JPG, PNG or WebP files into the private browser workspace.
- 02Set quality and format
Use Smart output or select WebP, JPEG or the original format, then choose a quality level.
- 03Compare and download
Review the size change and save one result or the complete ZIP.
HTML ONLINE VIEWER IMAGE COMPRESSOR
Reduce image file size—not just its dimensions
This free image compressor is part of HTML Online Viewer. It re-encodes JPG, PNG and WebP pictures locally, shows the actual input and output bytes, and lets you compare the preview before saving. Compression changes file size; resizing changes pixel dimensions. Neither action guarantees a particular number of kilobytes.If a form rejects a large photo, first choose JPEG or WebP and a moderate quality setting. Compress it, compare the reported bytes with the form limit, and inspect small text or faces. If it is still too large, use the image resizer to reduce unnecessary pixel dimensions, then compress again. A 100 KB or 200 KB limit is a target you check, not an output size this tool guarantees.
Keep PNG or choose WebP when transparency matters. JPEG does not preserve an alpha channel. Lowering a JPEG/WebP quality slider will not make PNG behave like a lossy photograph encoder; changing format or dimensions may help more. Keep the original when re-encoding produces a larger file.
Add the supported images, choose shared settings and run compression. Review each result rather than assuming one quality level suits every picture. Compare original bytes, output bytes and visible quality, then save individual images or the ZIP. Local processing avoids a document upload, but your browser still needs enough memory to decode the images.
COMMON QUESTIONS
Image Compressor FAQ
How can I compress an image without uploading it?
Choose the image in this tool and select Compress images. The browser decodes and re-encodes it locally; the file is not sent to our server.
Why can a compressed image become larger?
A small or already optimized image may grow after re-encoding. Try a lower quality or WebP output, and keep the original whenever it is smaller.
Does compression remove image metadata?
Yes. Re-encoding through the browser canvas normally removes EXIF and other embedded metadata, which can also reduce file size.
Can I compress an image to exactly 100 KB or 200 KB?
There is no exact file-size target control. Adjust JPEG/WebP quality, compare the output bytes with your limit, and reduce pixel dimensions with the image resizer if needed. Do not assume the result meets an upload limit until you check it.
Is reducing image size the same as resizing it?
Not always. File size is measured in bytes or kilobytes. Image dimensions are measured in pixels. This compressor changes encoding and quality; use the image resizer when you need a specific width or height.
Is HTML Online Viewer’s image compressor free and private?
The tool is free and needs no account. Supported images are decoded and re-encoded in your browser, not uploaded by the compressor. Ordinary website hosting, analytics or advertising requests are separate from image processing; see the privacy policy for those details.