Compress many images without uploading them
Most online compressors upload your images to a server, work through a queue and send the results back. This one does the work inside your browser tab, one image after another, so product shots, client photos and personal pictures never leave your device and there is no daily limit.
Each image is decoded once and re-encoded at the quality you pick. JPEG and WebP use your browser's encoder; PNG files are shrunk with palette quantization, which reduces a 24-bit PNG to a smaller set of carefully chosen colors. That step is what makes PNG compression effective, because simply re-saving a PNG barely changes its size.
How to compress images in bulk
Step 1: Add up to 50 images
Drop JPG, PNG, WebP, GIF, BMP, TIFF, AVIF, HEIC or SVG files onto the tool. Each file can be up to 100 MB.
Step 2: Choose a quality
High keeps the most detail, Medium is the balanced default and Low gives the smallest files.
Step 3: Pick the output format and size
Keep the original format or switch to WebP or JPEG, and optionally limit the longest side to 1920, 1280 or 800 pixels.
Step 4: Compress and download
Press Compress, check the savings shown for each file, then download files one by one or all together as a ZIP.
Settings you control
Three quality levels
High (0.9), Medium (0.8) and Low (0.44). For PNG these map to roughly 256, 147 and 16 colors.
Output format
Keep format, WebP for the smallest files with transparency, or JPEG for maximum compatibility.
Maximum dimension
Optionally scale the longest side down to 1920, 1280 or 800 px while keeping the aspect ratio.
Never bigger than before
When you keep the format, a file that would grow is returned unchanged instead.
What bulk compression is good for
Website and blog images. Smaller images load faster and help page speed scores.
Online shops. Prepare a whole catalog of product photos before uploading it to Shopify, WooCommerce or a marketplace.
Email and messaging. Fit a set of photos under attachment limits without sending them one by one.
Storage and backups. Reduce the space taken by screenshots and exported images.
Choosing the right quality level
Medium is the right starting point for most photos: at normal viewing size it is very hard to tell apart from the original, and file sizes typically drop by half or more compared with a camera or phone JPEG. High is worth using for photography portfolios and images with fine gradients. Low produces the smallest files and is fine for thumbnails and previews.
PNG behaves differently from JPEG because quality controls the number of colors. Screenshots, icons and flat graphics often look identical even at Low, while photographic PNGs can show banding at Low and are better served by Medium, High, or conversion to WebP.
- Photos for the web: Medium, or WebP at Medium.
- Portfolios and detailed artwork: High.
- Thumbnails and previews: Low.
Formats, transparency and metadata
Keep format preserves JPG, PNG and WebP. Other inputs such as GIF, BMP, TIFF, AVIF and HEIC are saved as JPEG, the most compatible choice for photos. WebP keeps transparency with very small files; JPEG has no transparency, so transparent areas are filled with white.
Re-encoding removes EXIF metadata, including camera details and GPS location, which also saves a few kilobytes and protects privacy when sharing. Animated GIFs are compressed as a still image of their first frame.
Tips for better compression
- Resize huge photos with the maximum dimension option; pixel count affects size more than any quality setting.
- Try WebP for web images; it is usually the smallest option at the same quality.
- Compress originals, not already-compressed copies, to avoid stacking artifacts.
- Need every file under a specific size such as 200 KB? Use the target file size tool for that image.
Bulk image compressor FAQ
How many images can I compress at once?
Up to 50 images per batch, each up to 100 MB. For more, run several batches; nothing is uploaded, so each batch starts immediately.
Will my images lose quality?
Compression is lossy, but at Medium and High the difference is very hard to see at normal size. Low trades more detail for smaller files.
Does it work with PNG files?
Yes. PNGs are compressed by reducing their color palette, which can shrink them dramatically while keeping transparency.
Are my photos uploaded to a server?
No. All decoding and encoding happens in your browser, so the images stay on your device.
Is EXIF data removed?
Yes. Re-encoded images do not keep EXIF fields such as camera model, date and GPS location.
Why did a file not get smaller?
Already optimized images may not shrink further. When you keep the format, the tool returns the original rather than a larger file.