In-browser JPEG compressor
Reduce JPEG file size while keeping the image quality you need. Choose a target size or compression level and download your smaller image.
Drop JPEG images here
or choose files from your device
JPG, JPEG · up to 30 MB each · max 20 files
You can also paste an image with Ctrl / ⌘ + V
Image compression reference
JPEG compression reduces file size by removing image frequencies that the human eye is least sensitive to. CompressJPEG runs entirely in your browser using WebAssembly, delivering up to 70%–85% file size reduction without noticeable blurriness.
JPEG uses Discrete Cosine Transform (DCT) to convert 8×8 pixel blocks into frequency values. By quantizing imperceptible high-frequency variations while preserving structural luminance, file size shrinks drastically with zero visible degradation.
The three most effective levers to reduce JPEG size are: balanced quality quantization (quality 75–85), scaling down image dimensions when original resolution exceeds display needs, and stripping unnecessary EXIF camera metadata.
Higher compression produces smaller files but can soften fine details. When an application portal requires an image under 50KB or 100KB, Target Size mode automatically finds the highest quality level that stays safely under your limit.
Jump directly to specialized target size tools for specific form limits:
Target size
Set the maximum file size and we’ll search for the highest quality that fits instead of making you guess a compression setting.
Real-world results
Drag the slider to compare the high-resolution original against the compressed file. Notice zero visual difference in edges, textures, or gradients.
379.6 KB
1200 × 675 · Quality 95%
116.9 KB
✓ 69.2% File Size Saved
Highest quality that fits the limit — sizes shown are from a real run of Target Size mode.
Compression modes
Best for most images
Automatically balances file size and visual quality.
You choose the quality
Control the JPEG quality level yourself.
Best for upload limits
Set a maximum file size and we’ll find the highest quality that fits.
Not sure? Try Target Size — the mode built for “must be under 200 KB” forms.
Simple 3-step workflow
Three steps to a smaller JPEG.
Drop your JPG, browse files, or paste directly from clipboard with Ctrl / ⌘ + V.
Select an exact file size limit (like 100KB) or use Smart mode for automatic balance.
Save your compressed photo instantly with zero uploads and pristine clarity.
CompressJPEG processes your images directly in your browser. Your photos are not uploaded to a server.
Images stay on your device.
Start compressing immediately.
Your compressed images remain yours.
Where it helps
Every platform has different size limits. Here is how our target compression modes solve real submission hurdles.
Meet image-size requirements without manually guessing compression settings.
Get passports, signatures, and identity documents below strict portal size limits.
Shrink multi-megabyte photo attachments under 200KB for quick delivery.
Optimize banners and blog imagery under 500KB to boost loading speeds.
FAQ
Drop your JPEG into the upload zone above, or choose files from your device (you can also paste with Ctrl/⌘ + V). The editor opens with your images — pick Smart, Quality, or Target Size, press Compress, then download the result.
Choose the Target Size mode and pick 200 KB (or type a custom size). The tool searches quality 100→1 for the highest quality that fits under your limit. If it cannot fit without ruining the photo, it will say so and suggest enabling Resize instead of silently destroying quality.
Smart (Balanced) is right for most people — it picks quality 80 automatically. Use Quality when you want manual control via the slider. Use Target Size when a form, portal, or upload demands a maximum file size.
Yes, JPEG compression is lossy — some data is permanently removed. At Smart Balanced (quality 80), the difference is invisible for most photos. Maximum Savings is visibly softer but much smaller. The before/after comparison shows you exactly what changed.
Typically 60–80% at Balanced. A 4 MB phone photo usually becomes roughly 1 MB. Busy, detailed photos compress less than simple ones. The result screen always shows original → compressed size, percentage, and bytes saved.
Yes. Compression runs locally in your browser — image bytes are never uploaded to our servers. The compression library itself loads from a CDN, so the page needs internet once, but your photos never leave your device.
Yes — up to 20 images. They are processed one at a time so large batches don’t freeze your browser. Download individually or all together as a ZIP file.
No signup · No uploads · No watermark
Upload your image and choose the size you need.