Compress PDF to 100KB
Automatically finds the best quality that fits under 100KB. Your file never leaves your device — everything runs in the browser.
Drop your PDF here
or click to choose a file · up to hundreds of MB
Choose PDF fileWhere a 100KB limit shows up
Messaging apps & mobile
A light PDF sends fast over mobile data and opens instantly on the other side. Under 100KB is small enough for any chat app.
Website upload forms
Booking, application, and quote-request forms often set attachment limits as low as 100KB. If your upload failed, an oversized file is the usual cause.
Government & official submissions
Permit applications, tax documents, and official web portals enforce strict attachment caps. A PDF under 100KB sails through most of them.
How it works
- 1Select your PDF or drag & drop it.
- 2The target size is pre-set to 100KB — just hit the compress button.
- 3The tool searches for the best quality that fits under 100KB, then you download the result.
Frequently asked questions
Will the file really end up under 100KB?+
The tool steps image resolution down and keeps the best-looking result that fits under 100KB. If a document simply can't go that low (e.g. it's all text and fonts with nothing left to shrink), you get the smallest achievable file instead.
Is my file uploaded to a server?+
No. Compression runs entirely in your browser via WebAssembly — the file never leaves your device. Safe even for sensitive contracts and records.
Does compressing to 100KB hurt quality a lot?+
Text-heavy documents stay perfectly readable even under 100KB. Photo- or scan-heavy PDFs need aggressive downscaling, so quality loss can be visible — check the result and retry with a larger target if needed.
Which PDFs compress well to 100KB?+
Scans, photos, and graphics-heavy PDFs shrink the most. Already-optimized text PDFs have little left to remove, so the original may be returned unchanged.