Image Compressor
Smaller Files, Your Quality Choice
Compress JPG, PNG, and WebP images with a quality slider you control. Batch-friendly, watermark-free, and processed entirely on your device.
What you control
- Output quality10-95%
- Output formatJPG / PNG / WebP
- Files per runUnlimited
- Uploads to serversNone
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How to compress images
- 01Add your imagesDrag in one photo or a whole folder of JPGs, PNGs, or WebPs.
- 02Pick quality and formatSlide the quality dial or switch the output format if you want conversion too.
- 03Download everythingGrab each compressed file individually with savings shown per image.
Features
Visible size savings
Every result shows before-and-after sizes so you know exactly what you saved.
Format switching built in
Compressing a PNG as JPG often halves the size - just pick the output format.
Batch queue
Queue dozens of images at once; each one is processed sequentially without freezing the tab.
No watermarks
Compressed images come back exactly as they went in, minus the bytes.
Works offline after load
Once the page has loaded, compression runs even if your connection drops.
Private by design
Images are decoded and re-encoded by your own browser - nothing is transmitted.
Built for everyday image jobs
Why browser-side compression wins
Zero upload wait
A 20 MB photo never travels anywhere, so there is no upload progress bar to sit through.
Sensitive photos stay local
ID scans, contracts, and personal pictures are processed inside your browser sandbox.
Predictable output
You set the quality, so results are consistent across every file in the batch.
No accounts or limits
There is no daily quota, signup wall, or paid tier between you and smaller files.
What actually happens when you compress an image
JPEG and WebP compression works by throwing away visual information your eye is unlikely to miss - fine color transitions, tiny high-contrast details, and subtle gradients. The encoder divides the image into blocks and quantizes each one, storing fewer bits for blocks that barely change. That is why a cloudy sky compresses beautifully while text on a white background shows artifacts first.
PNG is different: it is lossless, so re-encoding cannot discard data. The way to shrink a PNG here is dimension reduction, which is why the PNG path focuses on resizing rather than quality levels. If you need dramatic PNG savings without shrinking, converting to WebP usually keeps transparency and still cuts the file dramatically.
The practical sweet spot for web photos sits around 70-85% JPEG quality. Below that, artifacts creep into flat areas; above it, each extra percent costs bytes faster than it buys visible quality.
“I batch my blog photos at 80% quality and pages that used to crawl now load instantly.”
Maren Holt - Web designer
“Converting product PNGs to JPG where transparency isn't needed cut our image weight by two thirds.”
Dev Iyer - E-commerce manager
“Knowing nothing gets uploaded means I can safely compress client proofs before sending.”
Lena Fischer - Photographer
Frequently asked questions
How does this image compressor work?
Your browser decodes each image onto a canvas, then re-encodes it at the quality level you chose. All processing happens locally - the file is never sent to a server.
Which formats can I compress?
JPG, PNG, and WebP inputs are supported, and you can output to any of those formats regardless of input.
How much smaller will my images get?
It depends on the source. Photos typically shrink 50-80% at 75% quality. PNG graphics may shrink less unless converted to JPG or WebP.
Is there a file count limit?
No hard limit. Images are processed one at a time, so very large batches simply take longer.
Will compression reduce image quality visibly?
At 70-90% quality most photos look identical to the original. Lower settings trade fidelity for size, and the preview lets you judge before downloading.
Do compressed images keep their metadata?
Re-encoding strips EXIF metadata such as GPS coordinates and camera settings, which also contributes to smaller files.