Batch Image Compressor
Compress multiple images and download them as a ZIP
Batch Image Compressor — what it does
Drop in a set of photos, pick an output format and a quality level, and every image is re-encoded through the browser canvas at that setting and returned in a single ZIP. It is the quickest way to bring a folder of camera-sized JPGs down to web-sized files without opening an editor or signing in anywhere.
When this tool helps
- Shrinking product or property photos before uploading them to a listing, CMS or shared drive with a size cap.
- Cutting the weight of an email attachment set that a mail server keeps rejecting.
- Preparing a page full of images for the web, where each extra megabyte costs real load time on mobile.
How to use it
- Choose all the images you want to compress.
- Select the output format: JPG, PNG or WebP.
- Set the quality slider — 0.7 to 0.8 suits most photos.
- Compress and download the ZIP archive.
Accuracy, limits, and good practice
- Quality below roughly 0.6 starts showing blocky artefacts around text and sharp edges, most visibly in screenshots.
- PNG output is lossless, so the quality setting has little effect there; convert photos to JPG or WebP for real savings.
- Re-encoding strips EXIF, including camera and GPS tags — helpful for privacy, but a loss if you rely on capture metadata.
Frequently asked questions
Will compression change my image dimensions?
No. Pixel width and height stay the same; only encoding quality changes. Use the batch resizer if you also need smaller dimensions.
Which format gives the smallest files?
WebP at the same visual quality is typically 25 to 35 percent smaller than JPG, and every current browser supports it.
Can I compress the same file twice?
You can, but each pass discards more detail permanently. Always compress from the original rather than from an earlier output.
Related tools on this site
- Photo ID Sheet Generator — Arrange repeated ID photos on an A4 or Letter sheet
- Color Blindness Simulator — Preview an image under common color-vision deficiency simulations
- Image Color Replacer — Replace a selected color using adjustable tolerance
Everything above runs inside this page. Batch Image Compressor needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
批量圖片壓縮能做什麼
把一批照片拖進來，選好輸出格式與品質，工具會用瀏覽器 canvas 依該設定逐張重新編碼，最後打包成一個 ZIP。這是把整個資料夾的原始尺寸 JPG 壓成網頁可用檔案最快的方式，不必開修圖軟體，也不用註冊帳號。
什麼時候用得上
- 上架商品或房源照片前先縮小，以符合刊登平台、CMS 或共用雲端的容量限制。
- 縮減一整組郵件附件，避免被郵件伺服器退回。
- 整理整頁圖片素材，因為每多一 MB 在手機上都是實際的載入時間。
使用步驟
- 選擇所有要壓縮的圖片。
- 選擇輸出格式：JPG、PNG 或 WebP。
- 調整品質滑桿，一般照片建議 0.7 至 0.8。
- 執行壓縮並下載 ZIP 檔。
精確度、限制與實務建議
- 品質低於約 0.6 後，文字與銳利邊緣周圍會出現方塊狀失真，螢幕截圖最明顯。
- PNG 為無損格式，品質設定影響有限；照片改存 JPG 或 WebP 才會真正變小。
- 重新編碼會清掉 EXIF，包含相機與 GPS 資訊——對隱私是好事，但依賴拍攝資訊者需留意。
常見問題
壓縮會改變圖片尺寸嗎？
不會。像素寬高維持不變，只改變編碼品質。若也要縮小尺寸，請改用批量縮放工具。
哪種格式檔案最小？
同樣視覺品質下，WebP 通常比 JPG 小 25% 到 35%，且目前主流瀏覽器都支援。
同一張可以壓兩次嗎？
可以，但每壓一次都會永久丟失更多細節。請一律從原始檔重壓，而不是拿上一次的輸出再壓。
本站相關工具
以上步驟全部在這個頁面內完成，批量圖片壓縮 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。