Compress Images for Email
Phone photos are often 3 to 8 MB each, and attachments grow by about a third in transit because email encodes them as Base64. Resizing to 1600 px and saving as JPG at quality 72 usually brings a photo to a few hundred KB, which still looks sharp on screen and lets you attach many at once.
- 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 Email
- 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 email
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
Hit a file-size limit for forms and uploads. Searches quality, then dimensions, and can pad up to a minimum.
Reduce any photo to 1MB or less for forms, portals and email limits, keeping it as sharp as possible.
Convert HEIC to JPG in your browser, with transparency filled in a colour you pick. Batch, private, no uploads.
Shrink phone photos, iPhone HEIC included, to compact 2048 px JPGs right on your phone. No app to install, nothing uploaded.
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
What is the attachment limit?
Gmail allows 25 MB per message and Outlook.com 20 MB, and both limits include the roughly 33 percent Base64 overhead. Company mail servers often set lower limits. Photos of a few hundred KB each stay well clear of all of them.
Will the photos look worse?
Not at normal viewing size. 1600 px fills most laptop screens, and quality 72 removes detail you would only notice zoomed in. If someone needs to print the photos, send the originals through a file-sharing link instead.
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.