UnderByte

Compress images and PDFs to exact size limits

Visit underbyte.app ↗Alternativestop 13% of April 2026

What it does

UnderByte compresses images and PDFs to the exact upload limit you need, like 20 KB, 200 KB, 500 KB, or 1 MB. Everything runs in your browser, so files stay on your device after the app loads. It handles JPG, PNG, WebP, and PDF, supports batch mode, and is built for real-world government, visa, job, and form-upload size limits.

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