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Scalir

scalir.org

Free plan WebWindowsLinuxSelf-hosted
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Spec score 8.5 #15 of 85 in Image Compression Software

Spec sheet

What it does
Scalir compresses, resizes, and converts images in bulk in the browser, processing files on the user's device.Read 11 Oct 2026 · scalir.org
Free plan
YesRead 20 Sep 2026 · scalir.org
Privacy
Image processing happens locally, and EXIF/GPS metadata is stripped on re-encode while orientation is preserved.Read 11 Oct 2026 · scalir.org
Support
The maker invites bug reports through the GitHub repository or by email at [email protected].Read 11 Oct 2026 · scalir.org
License
Scalir is open source under the MIT license.Read 11 Oct 2026 · scalir.org
Analytics
The public website uses self-hosted Umami analytics described as cookieless and collecting no personal data; the desktop app and self-hosted copies collect no analytics.Read 11 Oct 2026 · scalir.org
Batch processing
YesRead 20 Sep 2026 · scalir.org
Bulk processing
It can process a folder in parallel across CPU cores and download the batch as a ZIP or save it to a folder.Read 11 Oct 2026 · scalir.org
Compression modes
bothRead 20 Sep 2026 · scalir.org
Desktop availability
Windows installers are listed for Windows 10/11 and Linux downloads are listed as AppImage, .deb, and .rpm; the site says there is no separate macOS desktop build yet.Read 11 Oct 2026 · scalir.org
Hosted limit
The hosted app has a small soft per-session limit, while self-hosted and desktop builds are unlimited.Read 11 Oct 2026 · scalir.org
Image resizing
YesRead 20 Sep 2026 · scalir.org
Intended audience
The maker says they built it for their own client work, including optimizing images before uploading them to WordPress sites.Read 11 Oct 2026 · scalir.org
Metadata controls
YesRead 20 Sep 2026 · scalir.org
Offline use
Scalir can be installed as a PWA and works offline after first load; native desktop builds are offered for Windows and Linux.Read 11 Oct 2026 · scalir.org
Presets
It includes built-in presets and lets users save custom presets and remember settings between visits.Read 11 Oct 2026 · scalir.org
Resizing
It supports resizing by exact width, exact height, percentage, or longest-side cap, preserves aspect ratio, and does not upscale images.Read 11 Oct 2026 · scalir.org
Self-hosting
Scalir can be run with Docker behind a firewall with no per-image limits and no data leaving the user's network.Read 11 Oct 2026 · scalir.org
Supported formats
JPG/JPEG,PNG,WebP,AVIF,HEIC/HEIF,GIF,TIFF,BMPRead 20 Sep 2026 · scalir.org
Supported inputs
It accepts JPG/JPEG, PNG, WebP, AVIF, HEIC/HEIF, GIF, TIFF, and BMP images.Read 11 Oct 2026 · scalir.org
Supported outputs
It exports JPEG, PNG, WebP, or AVIF, with automatic or user-selected format.Read 11 Oct 2026 · scalir.org

Plans and prices

Scalir Free No paid tier · hosted app has a small soft per-session limit · self-hosted and desktop builds are unlimited Read 11 Oct 2026 · scalir.org

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