Compress Images for Email Attachments
Compress photos for email attachments. Avoid bounced emails and slow downloads. Works with Gmail, Outlook, Yahoo. Free tool.
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Attaching large photos to emails is a common frustration — Gmail caps total attachments at 25MB, Outlook at 20MB, and many corporate servers at 10MB. A single uncompressed phone photo can be 5–10MB, meaning you can attach only 2–3 photos before hitting limits. Compressing images to 200–500KB each lets you send 20+ photos in a single email. This tool reduces file sizes while keeping photos sharp on screens — the recipient won't notice any quality difference at normal viewing sizes. All compression happens in your browser for complete privacy.
100% Private
Your image never leaves your device. All processing happens in-browser.
Instant Compression
Target: under 500KB at 75% JPEG quality.
JPEG Output
Optimized JPEG encoding for the best size-to-quality ratio.
How to Compress Your Image
- Click "Open Image Compressor" above
- Upload your image (drag & drop or click to browse)
- Set quality to 75% and output format to JPEG
- Click Compress and download the smaller file
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Why Compress Images to 500KB
Attaching large photos to emails is a common frustration — Gmail caps total attachments at 25MB, Outlook at 20MB, and many corporate servers at 10MB. A single uncompressed phone photo can be 5–10MB, meaning you can attach only 2–3 photos before hitting limits. Whether it is email attachments or sharing files on messaging apps, keeping your images under 500KB ensures faster delivery and trouble-free uploads. Our browser-based compressor adjusts JPEG quality to 75% and optimizes encoding — all without uploading your image to any server.
Best Settings for Email attachments
For email attachments, JPEG at 75% quality gives the best balance of file size and visual clarity. At this quality level, photos look clear at normal viewing size. Fine details may show slight softening when zoomed in at 200%+, but for on-screen use and print-at-size, results are excellent. If the result is still above the target size, try resizing to smaller pixel dimensions first using our Image Resizer.
Complete Privacy — No Server Uploads
Every step of the compression happens in your browser using the Canvas API and modern image codecs — your image is decoded, quality-adjusted, and re-encoded entirely on your device. This makes it safe to compress personal photographs, identity documents, medical records, and confidential certificates. No data leaves your computer, there are no daily usage limits, and you can process as many images as needed.
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Frequently Asked Questions
What size should email photo attachments be?
Aim for 200–500KB per image. This keeps total attachment size manageable and ensures fast download on the recipient's device, even on mobile data.
Will the recipient notice the compression?
At 75% JPEG quality, differences are imperceptible at normal viewing sizes (phone screen, laptop). Only zooming in to 200%+ on a 4K monitor might reveal subtle differences.
How many compressed photos can I email at once?
At 300KB each: about 80 photos within Gmail's 25MB limit. At 500KB each: about 50 photos. Compress more aggressively if you need to send a larger batch.
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