WebP Compressor
Compress static WebP images free in your browser. Adjust quality or target size, compare the result, and download without uploading your images.
or drag & drop here
Paste from clipboard with Cmd+V · Multiple files supported
Supported: JPG · PNG · WebP · AVIF · HEIC
- Never uploaded
- No watermark
- No sign-up
- No server upload limits
How It Works
Simple 3-step compression powered entirely by your local browser
Select or Drop Images
Choose supported JPG, PNG, WebP, AVIF, HEIC files from your device.
Choose Output Settings
Adjust the output format, quality, or target size for the result you need.
Inspect and Download
Processing runs locally in the browser. Review the result before downloading.
Why Choose LessMB
The private, modern alternative to legacy cloud compressor websites
100% In-Browser Privacy
Zero bytes uploaded. Your personal photos, sensitive documents, and private videos never touch external servers or cloud storage.
Zero Queue & Instant Start
No waiting in cloud conversion queues or watching slow upload bars. Processing starts the millisecond you drop your file.
Hardware Acceleration
Harnesses WebAssembly SIMD and WebCodecs GPU encoding for high-fidelity compression directly on modern consumer hardware.
No Credit Consumption
Free tier compression uses your own device compute, meaning zero server credit drain for everyday single and batch tasks.
About This Format
WebP supports both lossy and lossless images, including transparency. This tool is for static WebP files: it re-encodes the image locally with an adjustable quality setting. A format that supports lossless encoding does not mean every WebP compressor uses that mode.
How Its Compression Works
LessMB decodes a static image and encodes it with a WebAssembly WebP codec. The current quality control uses lossy encoding; setting it to maximum does not activate lossless mode. A target-size request may also reduce image dimensions. Output size depends on the source, so an already efficient WebP can have little room to shrink.
Practical Tips
- Keep WebP as the output format for a WebP result. The original-format option keeps static WebP input in WebP; advanced settings can convert it to another supported format.
- Start with a moderate quality setting and inspect small text, edges, gradients, and photo detail. Raise quality if artifacts are visible; no single setting guarantees an invisible change.
- Check transparent edges against a contrasting background. Choosing JPEG instead of WebP removes support for transparency.
- If a target is not reached, review the reported output size and dimensions. Try a smaller image only if its intended display size allows it, or keep the original.
- Preserve your original. This workflow is not an animated WebP optimizer and does not promise to preserve metadata or color profiles.
Frequently Asked Questions
Straight answers about this tool and how it works
Explore Related Tools
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Tutorials & Guides
Deep dives from the LessMB editorial team
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How to Compress Images to an Exact File Size
Set a target KB or MB size, understand why files miss hard limits, and use a browser-local workflow to verify the final output before upload.
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