How it works
Upload JPG or WebP photos and move the quality slider. The compressor re-encodes each file locally so you can compare size before download.
Reduce file size while maintaining quality.
JPG, PNG, and WebP. Max 20 files per batch.
Upload JPG or WebP photos and move the quality slider. The compressor re-encodes each file locally so you can compare size before download.
Conversions run in your tab with JavaScript — no desktop app required.
Files stay on your device during processing. We do not receive your uploads.
Heavy codecs and AI models run locally via Web Workers and WASM (FFmpeg.wasm, Transformers.js).
Upload JPG or WebP photos and move the quality slider. The compressor re-encodes each file locally so you can compare size before download.
Heavy compression reduces visible quality. PNG or RAW input is not supported. Batch size is limited by browser memory. Processing is 100% offline in your browser — files never leave your device.
Yes. This tool is free convert online with no signup. Processing stays in your browser — no uploads.
You control quality settings. Choose higher quality for no quality loss when converting online.
Every conversion runs inside your browser tab using JavaScript and Web Workers. There is no background server queue and no account is required for core tools.
Your files are never uploaded to FreeConvertKit for processing. Originals, previews, and exports stay on your device unless you choose to download or share them yourself.
When codecs or AI models are needed, WebAssembly modules such as FFmpeg.wasm and Transformers.js execute locally — giving you desktop-class power with absolute file privacy.
Convert JPEG photos to smaller WebP files in your browser.
Design 1080×1920 stories with overlays — all in the browser.
Flatten PNG photos to universal JPG in your browser.