Image Compress & Convert
Drop an image and compress it, convert it to a different format, or resize it — all locally, nothing uploaded. Convert between WebP, JPEG, and PNG. Adjust quality for lossy formats. Resize to specific dimensions or scale by percentage. The output shows the before/after file size so you can see the savings.
What it does
- ▸Converts between WebP, JPEG, and PNG formats
- ▸Adjustable quality setting for JPEG and WebP (1-100)
- ▸Resize to specific width/height or scale by percentage
- ▸Shows before/after file size comparison
- ▸All processing happens locally — no uploads, no server round-trip
- ▸Supports drag-and-drop or paste from clipboard
Use cases
- ▸Compressing a screenshot before attaching it to an email or ticket
- ▸Converting a PNG to WebP for smaller file sizes on the web
- ▸Resizing a photo to fit a specific dimension requirement
- ▸Batch-converting images for a website's asset pipeline
How it works
Drop an image file onto the input pane or paste from clipboard
Choose the output format (WebP, JPEG, PNG)
Set quality (for lossy formats) and optional resize dimensions
Download the converted image with the file size comparison shown
Frequently asked questions
1Is my image uploaded anywhere?
No. All image processing happens locally in the app using the browser's Canvas API and encoding libraries. Your image data never leaves your machine, which is important for sensitive screenshots or proprietary images.
2What's the best format for web images?
WebP offers the best compression for most images — typically 25-35% smaller than JPEG at equivalent quality, with transparency support. PNG is best for images that need lossless quality or sharp edges (like UI screenshots). JPEG is the most widely compatible.
3Does resizing maintain aspect ratio?
Yes. When you specify a width or height, the other dimension is calculated automatically to maintain the aspect ratio. You can also specify both dimensions if you want to crop or stretch.
Related tools
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Crop images to specific dimensions or aspect ratios — PNG, JPEG, WebP output
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Remove EXIF, GPS, XMP and other metadata from photos — lossless
Base64 Image Encode/Decode
Convert images to Base64 data URIs and back
App Icon / Favicon Set
Drop one image (512px+ recommended) and get every favicon and app-icon size, ready to save
Use Image Compress & Convert offline in Devinity
All 95 tools run locally on your Mac. No internet required, no data sent to servers.
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