Bulk image compressor
The free bulk image compressor that shrinks hundreds of images at once — smaller files, same dimensions, right in your browser. Compress JPG, PNG and WebP to speed up your pages and stay under upload limits. No upload, no account, no watermark.
100% free — images are compressed on your device and never uploaded.
Compress a whole folder in three steps
Drop your images
Add as many as you like — they stay on your device, fully private.
Set the quality
Lower the quality or convert to WebP for smaller files; keep the dimensions or cap a max size.
Download the ZIP
Get every compressed image back as a single ZIP, ready to upload.
When to compress images in bulk
Lighter images, everywhere you publish.
Faster pages & better SEO
Compress every image on a page to improve Core Web Vitals and load speed — lighter images are one of the fastest SEO wins you can ship.
Upload size limits
Compress files to slip under marketplace, form and CMS upload caps, without re-shooting or re-exporting anything.
Email & sharing
Compress photos until they're light enough to attach and send, even on a slow connection.
Save storage & bandwidth
Compress a whole product catalog in one batch to cut storage and bandwidth across thousands of images.
How much can you save?
Typical reductions when you compress images in bulk.
Photos · JPG → WebP
Often 25–40% smaller with no visible difference — ideal for product shots and hero images.
Screenshots · PNG → WebP
Frequently 50–70% smaller, since PNG photos are heavy and re-encoding to WebP is far leaner.
Oversized uploads
Cap the longest side and you can cut several MB per image before you even touch quality.
What makes an image file large?
Three levers control file size — and the tool gives you all three.
Resolution (dimensions)
More pixels means bigger files. If you don't need full resolution, cap the max size.
Format
WebP and JPG are far smaller than PNG for photos; PNG only wins for graphics and transparency.
Quality
Lossy formats let you trade a little detail for a much smaller file — you choose the balance.
Reduce file size the most by combining all three: convert to WebP, lower the quality, and cap oversized dimensions.
Lossy, lossless or WebP: how compression works
Pick the right trade-off between file size and quality.
Lossy (JPG / WebP)
Drops detail you won't notice for big size cuts — best for photos and product shots.
Lossless (PNG)
No quality loss but larger files — keep for logos and transparency, or convert to WebP to shrink.
WebP
A modern format ~25–35% smaller than JPG at the same quality — best for the web.
Tip: convert photos to WebP at quality 75–85 for the biggest savings with no visible loss.
A compressor that respects your images
100% free, no sign-up
Private — no upload, runs in your browser
Compress hundreds of images at once
Quality slider — you control the trade-off
Keep format or convert to JPG / WebP
One-click ZIP download
Who uses a bulk image compressor?
Anyone shipping lots of images who needs them lighter.
E-commerce sellers
Compress entire product catalogs in one batch so listings load fast and every image stays under marketplace upload limits — without paying for a designer.
Web & blog owners
Bulk-compress every image on a page to lift Core Web Vitals, shrink bandwidth bills, and keep your site fast as it grows.
Agencies & marketers
Prep client images in bulk — compressed, web-ready, and consistent across a whole campaign, in minutes instead of hours.
Tips to compress images for the web
Get the smallest files without visibly hurting quality.
Convert photos to WebP
WebP compresses photos 25–35% smaller than JPG at the same quality — the single biggest win for faster web pages.
Don't ship oversized images
A 4000px photo displayed at 800px wastes bandwidth. Cap the longest side to the size you actually show, then compress.
Match quality to the content
Photos tolerate quality 75–85 with no visible loss; flat graphics, logos and text stay crisp at higher quality or as PNG.
Explore the toolkit
Bulk image generator
Generate hundreds of AI product images from a CSV.
OpenBulk image resizer
Resize, convert and compress images — free, in your browser.
OpenBulk image upscaler
Increase image resolution in batches.
Background remover
Remove backgrounds from product photos in bulk.
Bulk image compressor FAQ
Is it really free?
Yes — the bulk image compressor is completely free, with no sign-up, no account, no watermark, and no limit on how many images you compress.
Are my images uploaded anywhere?
No. The whole compressor runs in your browser on your own device, so your images are never uploaded to a server and never leave your computer — that's what makes it instant and private, even for hundreds of files.
How much smaller will my images get?
It depends on the image and settings. Converting photos to WebP often saves 25–40% versus JPG, and lowering quality saves more. PNGs shrink most when converted to JPG or WebP.
Does compressing reduce quality?
Lossy compression trades a little detail for a big size cut. The quality slider lets you balance it — at 75–85 most images look identical to the original, while flat graphics and text may need a higher setting to stay crisp.
What formats can I compress?
Import JPG, PNG or WebP and compress them all in one batch. Keep each image in its original format, or convert the whole batch to JPG or WebP — converting photos to WebP usually produces noticeably smaller files at the same quality.
Will the dimensions change?
No — by default we keep the original dimensions and only shrink the file size. If you also want to cap a max width or height, turn on that option and the tool will resize before it compresses for even smaller files.
Why does my PNG barely get smaller?
PNG uses lossless compression, so re-encoding a PNG on its own saves very little. For big savings, convert PNG photos to JPG or WebP — only keep PNG when you need transparency or pixel-perfect logos and graphics.
Do I need to install anything?
No. The bulk image compressor runs in any modern browser — there's nothing to install, no extension, and nothing to sign up for. Just open the page, drop in your images, and compress.
Can I reduce file size without losing quality?
Converting photos to WebP at high quality (85–90) shrinks most images noticeably with no visible loss. For truly lossless output, keep PNG — but expect larger files.
Will compressing images help my Core Web Vitals?
Yes — smaller images load faster, which directly improves Largest Contentful Paint (LCP) and your overall page speed scores.