Compress Images for WordPress
WordPress scales any upload larger than 2560 px down to that size (the big_image_size_threshold introduced in WordPress 5.3) and saves the sizes it generates at JPEG quality 82. Doing the same before uploading keeps the original you upload small too, which saves storage, backups and upload time. Images keep their format, and camera metadata is removed.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
JPG, PNG, WebP, HEIC, AVIF, GIF, TIFF, SVG, RAW, PSD, JXL, BMP, ICO and more
How to use Compress for WordPress
- 1
Drop your images, choose files, or paste from the clipboard.
- 2
Adjust the options. The preview updates as you change them.
- 3
Click Compress. Files are processed on your device.
- 4
Download each result or everything as a ZIP.
Why use Aback Images for compress for wordpress
Best-in-class encoders
MozJPEG for JPG, OxiPNG and palette quantisation for PNG, libwebp and libavif for WebP and AVIF, all compiled to WebAssembly.
Live before/after
See the result and its file size on your actual image before processing the batch.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
Never bigger than the original
If compression cannot beat your file, the original is returned unchanged with a note.
Related tools
Make images website-ready in one pass: WebP at quality 78, at most 1920 px on the long side, camera metadata removed.
Clear PageSpeed image warnings: WebP, capped at 1920 px, at the smallest size that still looks identical, measured with SSIM.
Convert JPG to WebP in your browser, ready for images on websites and in apps. Batch, private, no uploads.
Strip EXIF, GPS, XMP, IPTC and comments losslessly. Pixels are never re-encoded for JPG, PNG and WebP.
Shrink JPG, PNG, WebP, AVIF and GIF files with MozJPEG, OxiPNG and modern codecs, with a live before/after preview.
Make JPEG photos smaller with MozJPEG, the encoder that beats standard JPEG by 10-15% at the same quality.
Cut PNG size by up to 80% with smart palette reduction and OxiPNG lossless optimisation, keeping transparency.
Re-encode WebP images smaller with libwebp's best settings, including animated WebP.
Frequently asked questions
Which sizes does WordPress create from my upload?
By default a 150×150 cropped thumbnail, medium (300 px), medium_large (768 px wide) and large (1024 px), plus 1536 and 2048 px versions; themes and plugins can add more. They are all made from the image you upload, so a compressed 2560 px original gives smaller versions too.
Does WordPress accept WebP and AVIF?
WordPress has accepted WebP uploads since version 5.8 and AVIF since 6.5, provided the server's image library supports them. Switch Save as to WebP if your host does; otherwise keep the original format.
Do I still need an image optimisation plugin?
Not for the images you prepare here. A plugin still helps with images other people upload and with an existing media library.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.