Compress images locally with the Image Compressor. Batch process files in your browser with full control over format and quality.
Why batch compression matters
A single 12 MP photo from a phone is often 3-8 MB. Send five of those by email and you hit attachment limits; put them on a page and you lose visitors to slow loading.
Compressing one image is easy. Compressing thirty - consistently, with the same settings, without forgetting any - is where people give up and upload originals anyway.
A batch workflow removes the friction: same format, same quality, same size target for every file, computed locally on your machine.
Choosing a format
| Format | Best for | Notes |
|---|---|---|
| WebP | Web pages, most photos | Small files, supported by all modern browsers |
| JPEG | Email, legacy tools, cameras | Universal compatibility, no transparency |
| PNG | Screenshots, logos, transparency | Lossless but large for photos |
| AVIF | Modern high-compression web | Excellent quality per byte, narrower support |
Batch compress with a local tool
- Open the Image Compressor in your browser.
- Select all the images you want to compress - the tool processes them one by one, client-side.
- Choose the output format (WebP, JPEG, or PNG) and quality.
- Optionally constrain the maximum dimensions to shrink oversized photos.
- Compress and download the results; compare a few against the originals to confirm quality.
- Check the metadata: local compression should also let you drop EXIF/GPS data from the output.
Note: Because compression runs in your browser, private photos - product shots, documents, screenshots with sensitive content - never leave your device.
The quality-size trade-off
Compression is a sliding scale: lower quality means smaller files and visible artifacts. The trick is finding the knee of the curve - the highest quality that still meets your size budget.
For web pages, target 100-300 KB per image for content photos and below 50 KB for thumbnails. For email, keep attachments under the common 25 MB limit with comfortable margin.
When in doubt, compare the compressed image side by side with the original at 100% zoom. If you cannot tell them apart, the setting is good.
Warning: Do not re-compress an already-compressed JPEG repeatedly - generation loss makes quality decay on every pass. Keep the original once and export new variants from it.
Metadata: the part people forget
Photos carry EXIF metadata: camera model, date, location, and sometimes faces or software versions. A compressed file can still leak all of it.
Privacy-focused workflows strip metadata as part of compression. Before sharing a batch publicly, confirm the output contains no GPS or device information.
This matters for both privacy and professionalism - a leaked geolocation in a screenshot is a common, embarrassing data breach.
What this means for your website
- Compress and convert to WebP/AVIF before upload - do not rely on runtime resizing alone
- Serve responsive sizes so mobile users do not download desktop images
- Use lazy loading for images below the fold
- Keep LCP images small and above the fold; image weight is usually the top Core Web Vitals culprit
- Add width and height attributes to prevent layout shift
FAQ
Q.What quality setting should I use?
A.Start at 80 for JPEG and WebP. If files are still too large, step down to 70 and compare visually; if quality suffers, step up. The right value is the highest setting that fits your size budget.
Q.What size should images be for email?
A.Keep attachments under the common 25 MB limit with margin, and prefer JPEG/WebP over PNG for photos. A 1200px-wide JPEG at quality 80 is usually 200-500 KB - fine for most email use.
Q.Why do my screenshots look blurry after compression?
A.Screenshots have sharp text and flat colors - lossy formats blur them. Use PNG for screenshots and UI captures, or a high-quality WebP setting, and avoid aggressive downscaling.
Q.Does compression remove location data?
A.Only if the tool strips metadata. The compressor on this site drops EXIF/GPS from output; check any tool you use, because many compressors preserve metadata by default.
Q.Can I compress without losing quality?
A.Lossless compression (PNG, or WebP in lossless mode) removes redundancy without artifacts, but gains are modest on photos. For maximum quality preservation, keep originals and only ship compressed copies.
References
- MDN – WebP image format: https://developer.mozilla.org/en-US/docs/Web/Media/Guides/Formats/Image_types#webp_image_format
- MDN – Choosing image formats: https://developer.mozilla.org/en-US/docs/Web/Media/Guides/Formats/Image_types
- web.dev – Image optimization: https://web.dev/articles/choose-the-right-image-format
- web.dev – Core Web Vitals (LCP): https://web.dev/articles/vitals
Compress images now
Batch, format, and quality control, all client-side. No upload, no account.
Batch locally, ship small
A repeatable batch workflow - right format, controlled quality, stripped metadata - protects privacy, unblocks email, and speeds up your site.
Compress your next batch with the Image Compressor - entirely in your browser, entirely private.