Resize & scale
Set exact pixel dimensions or use the percentage scale slider. Lock aspect ratio or set width and height independently. Includes common presets for social media, OG images and thumbnails.
Free · No uploads · Privacy first
Compress images to AVIF in seconds
The fastest browser-based image optimizer. Resize, crop, rotate and convert to AVIF — the web's most efficient image format. Your files never leave your device.
No account required
Files never uploaded
Batch compress up to 50 images
100% free forever
70%
Average file size reduction
AVIF
Best-in-class format for 2026
0
Files uploaded to any server
50+
Images per batch download
Features
Everything your images need
A complete image editing and optimisation toolkit that runs entirely in your browser — no installs, no accounts, no limits.
Smart AVIF compression
Uses the same libaom encoder as Squoosh and Webflow. Compression settings reverse-engineered to match Webflow's output quality — sharp images at a fraction of the file size.
Crop with aspect presets
Drag to crop freely or lock to common ratios — 1:1, 4:3, 16:9, 3:2, 9:16. Type exact coordinates for precision cropping. Crop is committed before export.
Rotate & flip
Free rotation with a slider, plus 90° left, right, 180° shortcuts. Flip horizontally or vertically. All transforms apply at full resolution before compression.
Batch optimisation
Upload up to 50 images at once. Apply the same resize and rotation settings across all images and download everything as a single ZIP file in one click.
100% private
Every operation runs inside your browser using WebAssembly. No files are transmitted to any server at any point. Your images are yours alone.
How it works
Three steps to smaller images
No learning curve. Upload, adjust, download.
01
Upload your image
Drag and drop or click to browse. Supports JPG, PNG, WebP, GIF, and BMP. Upload one image or a batch of up to 50 at once.
02
Edit and adjust
Resize to exact dimensions, crop to any ratio, rotate or flip as needed. A live preview updates instantly so you see the result before downloading.
03
Download compressed AVIF
Hit download. The tool encodes your image using the real libaom AVIF encoder at the exact quality Webflow uses — typically 50–70% smaller than your original.
Format comparison
Why AVIF in 2026?
AVIF is now the recommended format for web images — smaller files, better quality, broad browser support.
| Format | Avg file size | Quality | Transparency | Browser support | Recommended |
|---|---|---|---|---|---|
| AVIF | ★ Smallest | Excellent | ✓ | Chrome, Firefox, Safari 16+ | ✓ Best choice |
| WebP | Small | Very good | ✓ | All modern browsers | ✓ Good fallback |
| JPEG | Large | Good | ✗ | Universal | Legacy only |
| PNG | Largest | Lossless | ✓ | Universal | Logos/icons only |
FAQ
Common questions
Is Devdwell Tools completely free?
Yes — completely free, no account required, no watermarks, no daily limits. We don't monetise through paid plans or usage caps.
Are my images uploaded to a server?
No. All processing happens entirely inside your browser using WebAssembly. Your images are never transmitted anywhere. They never leave your device.
What image formats can I upload?
You can upload JPG, PNG, WebP, GIF, and BMP. All images are exported as AVIF — the most efficient modern web image format.
How much will my images be reduced?
Typical reductions are 50–70% versus the original JPEG or PNG with no visible quality difference. The exact saving depends on the image content and your resize settings.
Does AVIF work in all browsers?
AVIF is supported in Chrome, Edge, Firefox, and Safari 16+, covering over 95% of browser usage in 2026. For older browsers, use a <picture> element with a WebP or JPEG fallback.
Can I process multiple images at once?
Yes. Upload multiple images, apply your resize and rotation settings, then click "Optimise & Download ZIP" to receive all compressed images in a single ZIP file.