Image Compressor — Reduce Photo Size for Email

How to use this workflow

1. Upload one image for detailed comparison, or select multiple images for a batch.
2. Choose quality and format. Set maximum width at or above the original width and disable extra target-driven resizing to retain dimensions within the 8192-pixel width limit.
3. Compress, compare actual bytes and visual detail, and download. Batch results also offer a ZIP.

What to check before saving

Lossy JPG, WebP and AVIF encoding trades some image detail for size. PNG keeps transparency but may not shrink without resizing. For a website, choose dimensions for the actual display; for social media, check the destination requirements.

Inputs are limited to 20 MB and 40 megapixels. JPG, PNG, WebP, AVIF, HEIC/HEIF, GIF, SVG and selected PDF pages are supported. Exports are JPG, PNG, WebP or browser-supported AVIF; animation and source metadata are not retained.

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Questions & answers

Understand the settings

Read the related practical guide, or troubleshoot a file or export.

Reduce image size for uploads, email and online shops

How do I compress an image to 5 MB?

Enter 5000 in Target file size KB: this tool uses decimal units, so 5 MB is 5,000 KB. Choose JPG for a photo, or WebP if the destination accepts it. Compress and check the actual result. If the target is missed, allow smaller dimensions only when the destination permits them. The target is a maximum to aim for, not a guaranteed or padded output size.

How do I reduce photo size for email without uploading it?

Choose a JPG copy for broad compatibility, start at 80% quality, and reduce maximum width if the recipient does not need the original resolution. Compare faces and fine detail before downloading. A batch of up to 20 images can be saved as a ZIP, but the total attachment must still fit your provider’s limit. Keep full-size originals for printing.

How do I batch compress JPG photos for email?

Select up to 20 photos and choose JPG output for broad compatibility. Start with a width suitable for viewing and a moderate quality setting. Each image has its own content and file size: inspect every result and the total ZIP size before attaching it. Compression does not send an email or bypass attachment limits.

How should I optimise product images for an online shop?

Check the shop’s required dimensions and accepted formats first. Use the image resizer for a smaller proportional copy, then compare JPG and WebP at the actual display size. Check product textures, labels and transparent edges. Reuse your chosen settings across a batch, but review each result: different photographs do not compress to the same size.

For smaller form limits, use compress image to 100 KB or compress image to 200 KB. Minimum dimensions and file-size limits are separate requirements.

An image upload checklist: bytes, pixels and readable detail

A smaller file is useful only when it still meets the destination’s requirements. Before changing settings, write down three separate limits: accepted formats, maximum file size and required pixel dimensions. Keep the original so you can try another export without repeatedly compressing an already damaged copy.

Worked example: a 200 KB limit with minimum dimensions

Suppose a form accepts JPG up to 200 KB and requires at least 1200 × 800 pixels. Your landscape source is 2400 × 1600. These are illustrative requirements, not the rules of a particular service.

1. Select the original, choose JPG and set maximum width to 1200. Its proportions produce 1200 × 800; a differently shaped source produces a different height.
2. Enter 200 in the KB target. Leave “Allow smaller dimensions to meet target” disabled so the target search cannot reduce it below your chosen dimensions.
3. Process and check the reported size and dimensions. In this tool, 200 KB means 200,000 bytes. A result above the target does not meet the example limit.
4. Open the downloaded copy and inspect the smallest text, faces and important edges. If detail is unacceptable, return to the original. Meeting the byte limit does not guarantee a useful image or acceptance by the form.

If the source is narrower than the required width, this tool will not enlarge it. If the destination demands a different shape, crop in a suitable editor before compressing. See file size versus pixel dimensions for the distinction.

Compare two exports without confusing the results

Start both attempts from the same original. Keep dimensions fixed and change one setting at a time: first quality, then format if the destination allows it. Compare the actual downloaded bytes and view both images at the intended display size. The same quality percentage in JPG and WebP is not a promise of identical visual quality.

For screenshots, pay attention to thin letters and coloured text on contrasting backgrounds. For logos, check transparency against both light and dark backgrounds. Use the screenshot guide or transparent-image guide when those details matter.

When to keep the original

Keep the original if the export is larger, if critical detail becomes unreadable, or if the source already meets every requirement. A conversion to PNG can increase a photograph’s size; a smaller JPG can lose transparent pixels. There is no benefit in repeatedly exporting until a file merely looks smaller in a rounded size label.

If an otherwise valid file is still rejected, follow the upload rejection checklist. Changing a filename extension does not convert the image. Keep a separate master for printing, editing or a destination with different requirements.