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Bulk Compressor

Compress an entire folder of images in one go. Set quality, choose output format, and download everything as a single ZIP file. Free, private, browser-based.

Quality
82
75–85 is the sweet spot for web images
Output Format
Original
JPG
PNG
WebP

Drop your images here

Select as many as you need — no per-batch limit

JPG PNG WebP GIF
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Images
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Original size
→
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Compressed size
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Total saved
Compressing… 0%
Files 0 files

About This Tool

How to Bulk Compress Images

  1. 1Drop multiple images at once or click to select a batch — JPG, PNG, and WebP are all supported.
  2. 2Set your quality level. For web use, 75–85% typically delivers 60–80% file size reduction with no visible quality loss. Lower quality settings compress further but may introduce artifacts on detailed photos.
  3. 3The tool compresses all files simultaneously in your browser. A progress indicator shows each file as it completes.
  4. 4Download files individually or as a single ZIP. Original filenames are preserved for easy replacement in your existing workflow.

When to Bulk Compress Images

Website & Blog Image Optimization
Unoptimized images are the single most common cause of slow websites. Our guide on why websites are slow explains the direct link between image file size and Core Web Vitals scores.
E-Commerce Product Catalogs
Product-heavy stores can have hundreds of images. Batch compression before upload keeps page load times fast without manually processing each image. See our batch compression guide for workflow tips.
Photography Deliverables
Compress a full shoot for web gallery delivery or email without spending hours in Lightroom export dialogs. Set quality once and process the entire batch at once.
Email & Presentation Attachments
Email clients and slide decks struggle with large image files. Batch compress before attaching to keep file sizes manageable without visible quality loss.

Why Bulk Compress in the Browser

Cloud-based bulk compressors upload your entire image library to a third-party server — a privacy risk for confidential product shots, client photos, and unpublished work. This tool compresses everything locally in your browser using the Canvas API. For the best results, resize images to their display dimensions first using our Image Resizer before compressing — smaller dimensions mean smaller output files regardless of quality setting. For single-image compression with more granular control, use our Image Compressor. And for a complete overview of image optimization best practices, our guide on compressing images for the web without losing quality is a good starting point.

Frequently Asked Questions

The main difference is the ZIP download — Bulk Compressor packages all compressed images into a single ZIP file so you can download everything with one click. It also has no file count limit and shows a per-file savings breakdown in a scrollable list. The regular Image Compressor is better for smaller batches where you want to download individual files.

There’s no hard limit — you can compress as many images as your browser’s memory allows. For most devices, batches of 100–500 images work well. Very large batches of high-resolution photos (500+) may slow down or exceed memory limits. If you hit issues, process in smaller batches of 100–200 at a time.

For website images: 75–82 gives excellent results with file sizes typically 60–80% smaller than the original. For social media: 80–85 balances quality and size well. For archiving or print: 90–95 is barely distinguishable from lossless. Only go below 75 if you specifically need very small files.

Yes — WebP typically produces files 25–40% smaller than JPG at equivalent quality. If you’re compressing images for a website and browser compatibility isn’t a concern (WebP is supported by 97%+ of browsers), choosing WebP as your output format will give you significantly smaller files. For sharing with people or uploading to services that may not support WebP, stick with JPG.

No — all compression happens entirely in your browser using the Canvas API. Your images never leave your device. The ZIP file is also built client-side using the JSZip library. Nothing is transmitted to our servers at any point in the process.
Need to resize before compressing?
PaintShop Pro gives you batch resize, crop, and export tools alongside full compression control — ideal for processing large photo libraries in one workflow.
Try PaintShop Pro
Pro Tips
1
Use WebP format for website images — 25–40% smaller than JPG with no visible quality difference.
2
Resize before compressing — a 4000px photo served at 800px width is wasting 95% of its pixels.
3
Quality 82 is the sweet spot for most web images — great visual quality with maximum file size savings.
4
The ZIP file preserves your original filenames with a -compressed suffix so you can easily replace originals.
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