About SlimIO

SlimIO is a set of free, fast PDF and image tools: compress PDFs (even to an exact size like 100KB), merge, split, remove pages, rotate, reorder, add page numbers, watermark, sign, convert between PDF and JPG, and compress photos.

Why we built it

Everyday tasks — a job portal that only accepts files under 100KB, an email that bounces because a PDF is too big, a form that needs one signature — shouldn't require an account, a watermark on your document, or uploading private files to someone's server.

How it works

• Private by design. Most tools run entirely in your browser, so your files never leave your device. Server compression deletes files right after processing.
• No signup, no watermark. Open a tool and use it.
• English and Korean. Every tool is available in both languages.

How SlimIO stays free

SlimIO is run by an independent developer. The free tier has a daily usage limit, and small ads may be shown to cover hosting costs.

Questions or ideas? Contact us.