Compress JPG images - smaller files, same clarity.
Reduce JPG file size by 40-80% with adjustable quality control. Batch compress multiple files, compare original vs compressed sizes. No upload, no signup, runs entirely in your browser.
Drop your images here
or browse files or paste from clipboard
How to compress JPG images online.
Upload your images
Drag JPG, PNG, or WebP files onto the upload area. Select multiple files for batch compression. On mobile, tap to browse your camera roll. You can also paste a screenshot from your clipboard with Ctrl+V (Cmd+V on Mac).
Set the quality level
Drag the quality slider between 1 and 100. The default 80% gives 40-70% file size reduction with no visible difference at normal viewing. Each file shows its original size, compressed size, and exact savings percentage in real time.
Download compressed files
Click the download icon next to any individual file, or hit Download All to save every compressed JPG at once. Files save directly to your device - no server processing, no queue, no email required.
Who compresses JPG images and why.
Email attachments under the size limit
Gmail caps attachments at 25 MB. Ten uncompressed phone photos at 4 MB each blow past that limit instantly. Compressing at 80% quality drops each file to 800 KB-1.2 MB, bringing the batch to 8-12 MB total. The recipient sees no quality difference on screen, and the email actually delivers instead of bouncing.
Web page speed and Core Web Vitals
Uncompressed hero images are the top reason pages fail Google's Largest Contentful Paint threshold of 2.5 seconds. A 3.5 MB header photo at 80% quality becomes 700 KB-1 MB. On a 10 Mbps connection, that cuts load time from 2.8 seconds to under 0.8 seconds. Multiply by every image on the page and the performance gap is massive.
Social media upload requirements
Instagram re-compresses uploads above 1 MB at its own quality level, often introducing banding artifacts. Facebook caps photo uploads at 15 MB. Pre-compressing to 75-80% quality gives you control over the final output instead of letting the platform's aggressive encoder decide. The result looks sharper because you avoid double compression.
Storage savings on cloud and local drives
A year of phone photos at 12 MP generates roughly 15-20 GB of uncompressed JPGs. Batch compressing at 85% quality cuts that to 5-7 GB with no perceptible quality loss for on-screen viewing. That is 10-13 GB freed on iCloud, Google Drive, or a local SSD. For photographers archiving RAW exports, compressing the JPG previews alone recovers significant space.
Why this compressor works differently.
Most online compressors upload your images to a remote server, process them on Linux with libjpeg or mozjpeg, and send the result back. That round trip takes 3-10 seconds per image, exposes your photos to a third party, and breaks if your connection drops mid-upload. This tool runs entirely in your browser's Canvas API. The compression starts the moment you drop a file - no upload, no wait, no server to trust.
Real-time quality control
The quality slider recompresses every loaded image instantly as you drag it. You see the file size change in real time, so you can find the exact balance between size and visual quality for your specific images. Server-based tools make you upload, wait, download, check, re-upload at a different setting. Here the feedback loop is instant.
Batch processing with per-file metrics
Each image shows its original size, compressed size, and percentage saved individually. The header bar shows total savings across all files. This matters when you are compressing 20 product photos for an e-commerce site and need to verify that each one stays under a target file size. If one image compresses poorly (heavy texture, fine detail), you spot it immediately.
Multiple input formats, one output
Drop JPGs, PNGs, or WebPs and every file outputs as optimized JPEG. PNG screenshots with flat colors compress especially well - a 2 MB PNG screenshot at 85% JPEG quality often shrinks to 150-300 KB, a 6-10x reduction. WebP files from Chrome screenshots or modern cameras convert seamlessly. For the opposite direction - converting to lossless PNG - use the JPG to PNG converter.
Understanding JPEG quality numbers
JPEG quality is not a linear percentage of visual fidelity. Quality 100 is not "perfect" - it still uses lossy DCT compression, just with minimal quantization. The perceptual sweet spot is 75-85, where file size drops 60-80% but the human eye cannot distinguish the output from the original at normal viewing distance. Below 50, compression artifacts become obvious: 8x8 block boundaries in gradients, color halos around text, and smeared fine detail. For a deeper look at format tradeoffs, see the JPG vs PNG vs WebP comparison.
Combining with other tools
Compression pairs well with resizing. If your source image is 4000x3000 but you only need 1200px wide for a blog post, resize it first and then compress. Resizing removes 75% of pixels before compression even starts, so the final file is dramatically smaller. For batch operations across dozens of product images, the bulk resize tool handles resizing at scale, and you can compress the results here. Need to send compressed photos as a document? The JPG to PDF converter accepts compressed JPGs directly.
Merge images together?
Combine multiple photos into one image with vertical, horizontal, or grid layouts.
JPG JoinerResize before compressing?
Shrink image dimensions first, then compress for the smallest possible file size.
Resize ImageConvert images to PDF?
Turn compressed JPG files into a multi-page PDF document for sharing or printing.
JPG to PDFNeed lossless PNG instead?
Convert JPG to lossless PNG format when pixel-perfect accuracy matters more than size.
JPG to PNGFrequently asked questions.
How much can JPG compression reduce file size?
At the default 80% quality setting, most photos shrink by 40-70%. A 4 MB phone photo typically becomes 800 KB-1.2 MB. At 60% quality, the same file drops to 400-600 KB - a 5-8x reduction. Screenshots and graphics with flat colors compress even more aggressively, often hitting 80-90% savings because JPEG DCT encoding handles uniform blocks efficiently.
What does the quality slider actually control?
The slider sets the JPEG quantization level from 1 to 100. Higher values keep more DCT frequency coefficients, preserving fine detail and sharp edges. At 100, quantization is minimal and the file is near-lossless but only slightly smaller than the original. At 80, high-frequency detail (hair strands, fabric texture) gets rounded - invisible at screen size but measurable at 200% zoom. Below 50, mid-frequency data is quantized too, producing visible banding in gradients and halos around text.
Can I compress multiple images at once?
Yes. Drop or select any number of JPG, PNG, or WebP files and they all compress simultaneously. Each file shows its original size, compressed size, and percentage savings side by side. Adjusting the quality slider recompresses every loaded file in real time. Download individually or use Download All to save every compressed JPG at once.
Is this lossy or lossless compression?
This tool uses lossy JPEG compression. It re-encodes images using the DCT algorithm, discarding high-frequency data based on the quality level you choose. Lossless JPEG compression exists (Huffman table optimization) but only saves 2-8% - not enough for most use cases. If you need lossless, PNG or WebP lossless are better formats. For reducing file size by 40-80%, lossy JPEG at 75-85% quality is the standard approach.
How do I compress images for email attachments?
Most email providers cap attachments at 20-25 MB total. Set quality to 75-80% to shrink photos below 1 MB each. A batch of 10 phone photos (4 MB each, 40 MB total) compresses to roughly 8-12 MB at 80% quality - well within Gmail, Outlook, and Yahoo limits. For very strict size requirements, drop quality to 60% and each photo lands around 400-600 KB.
What quality setting works best for web optimization?
Google recommends JPEG quality between 70-85 for web images. At 80%, a 1200px-wide hero image is typically 120-200 KB - fast enough to score well on Core Web Vitals. Product thumbnails at 400px width compress to 25-50 KB at 75% quality. Below 70%, compression artifacts become noticeable on retina displays. Test at 80% first, then lower only if page speed needs demand it.
Does this work on phones and tablets?
Yes. The compressor runs in any modern mobile browser - Safari on iOS 15+, Chrome and Firefox on Android. Tap the upload area to select photos from your camera roll or files app. The quality slider works with touch input. Processing happens on-device, so compression speed depends on your phone hardware. A typical 12 MP photo compresses in under 1 second on recent iPhones and Android flagships.
Are my images safe? Where does the compression happen?
Your images never leave your device. The entire compression runs in your browser using the Canvas API and JavaScript. No files are uploaded to any server. You can verify this by opening browser developer tools (F12), switching to the Network tab, and compressing an image - zero outgoing requests. Close the tab and everything is gone from memory.
Is there a maximum file size or resolution limit?
There is no hard limit enforced by the tool. The practical constraint is your browser memory. Chrome allocates roughly 4 GB to a tab, which handles images up to about 100 megapixels (e.g., 10000x10000). Most phone photos are 12-48 MP and compress without issue. If you hit memory limits with very large files, try compressing fewer images at a time or use the <a href="/resize-image/" class="text-link underline decoration-hairline underline-offset-4 hover:text-link-deep">resize tool</a> to scale down first.